Fault prevention method, user database device, communication system, and storage medium

Abstract

The invention provides a fault prevention method, a user database device, a communication system and a storage medium. The fault prevention method comprises the steps of switching a current working mode from a normal working mode to a sub-overload state working mode under the condition that a first trigger condition is met; and sending the first mode switching notification message to the network element, so that the network element adjusts a service associated with the user database device to match the sub-overload state working mode.

Description

Technical Field

[0001] The present disclosure relates to the field of communications, and in particular to a fault prevention method, a user database device, a communication system and a storage medium. Background Art

[0002] When a communication network fails, voice and SMS services of a large number of users will be interrupted. After the communication network fails, these users need to reconnect to the network. Summary of the invention

[0003] The inventors have noticed that in the related art, when a large number of users access the network, the HSS (Home Subscriber Server) or UDM (Unified Data Management) device will be overloaded, thereby causing a signaling storm. However, in the current 3GPP (3rd Generation Partnership Project), there is no prevention mechanism or disaster recovery solution for the overload of HSS or UDM devices caused by a large number of registrations or re-registrations.

[0004] Accordingly, the present disclosure provides a fault prevention solution that can effectively solve the load overload problem of HSS or UDM devices caused by a large number of registrations or re-registrations.

[0005] In a first aspect of the present disclosure, a fault prevention method is provided, which is executed by a user database device, and the method includes: when a first trigger condition is met, switching the current working mode from a normal working mode to a sub-overload working mode; sending a first mode switching notification message to a network element so that the network element adjusts the service associated with the user database device to match the sub-overload working mode.

[0006] In some embodiments, the first trigger condition includes: a preset characteristic value is greater than a preset characteristic value threshold, and a duration during which the preset characteristic value is greater than the preset characteristic value threshold exceeds a preset duration threshold.

[0007] In some embodiments, the preset characteristic value being greater than the preset characteristic value threshold includes at least one of the following: the instant total number of visits is greater than the total number of visits threshold; the first ratio of the instant repeat number of visits to the instant total number of visits is greater than the first ratio threshold; the second ratio of the instant total number of visits to the total number of visits at the previous moment is greater than the second ratio threshold; the third ratio of the instant load to the rated load is greater than the third ratio threshold.

[0008] In some embodiments, sending the first mode switching notification message to the network element includes: adding a first preset identification bit to a preset notification message to generate the first mode switching notification message; and sending the first mode switching notification message to the network element.

[0009] In some embodiments, sending the first mode switching notification message to the network element includes: sending the first mode switching notification message to the network element through preset signaling.

[0010] In some embodiments, when the second trigger condition is met, the current working mode is switched from the sub-overload working mode to the normal working mode; and a second mode switching notification message is sent to the network element so that the network element adjusts the service associated with the user database device to match the normal working mode.

[0011] In some embodiments, the second trigger condition includes: a preset characteristic value is not greater than a preset characteristic value threshold, and a duration during which the preset characteristic value is not greater than the preset characteristic value threshold exceeds a preset duration threshold.

[0012] In some embodiments, the preset characteristic value is not greater than the preset characteristic value threshold, including at least one of the following: the instant total number of visits is not greater than the total number of visits threshold; the first ratio of the instant repeat number of visits to the instant total number of visits is not greater than the first ratio threshold; the second ratio of the instant total number of visits to the total number of visits at the previous moment is not greater than the second ratio threshold; the third ratio of the instant load to the rated load is not greater than the third ratio threshold.

[0013] In some embodiments, sending the second mode switching notification message to the network element includes: adding a second preset identification bit to a preset notification message to generate the second mode switching notification message; and sending the second mode switching notification message to the network element.

[0014] In some embodiments, sending the second mode switching notification message to the network element includes: sending the second mode switching notification message to the network element through preset signaling.

[0015] In some embodiments, the user database device includes a user home server HSS or a unified data management UDM device.

[0016] In some embodiments, the network element includes at least one of a routing agent node DRA, an IP multimedia subsystem IMS device, and a packet switching PS domain device.

[0017] In a second aspect of the present disclosure, a user database device is provided, comprising: a first processing module, configured to switch a current working mode from a normal working mode to a sub-overload working mode when a first trigger condition is met; a second processing module, configured to send a first mode switching notification message to a network element, so that the network element adjusts a service associated with the user database device to match the sub-overload working mode.

[0018] In a third aspect of the present disclosure, a user database device is provided, comprising: a memory; and a processor, coupled to the memory, the processor being configured to execute a method as described in any of the above embodiments based on instructions stored in the memory.

[0019] In a fourth aspect of the present disclosure, a communication system is provided, comprising: a user database device as described in any of the above embodiments; and a network element configured to adjust a service associated with the user database device to match the sub-overload working mode according to a first mode switching notification message sent by the user database device.

[0020] In some embodiments, the network element is configured to extend the timeout determination duration according to a requirement of the user database device or a preset agreement.

[0021] In some embodiments, the network element is configured to reduce unnecessary access requests to the user database device according to requirements or preset agreements of the user database device.

[0022] In some embodiments, the network element includes at least one of a routing agent node DRA, an IP multimedia subsystem IMS device, and a packet switching PS domain device.

[0023] In some embodiments, the above-mentioned system also includes an access network device, wherein the network element is configured to adjust the access policy or service policy of the user terminal when belonging to the PS domain device, and send the adjusted access policy or service policy to the access network device; the access network device is configured to control the access operation or service operation of the user terminal according to the adjusted access policy or service policy.

[0024] In some embodiments, the network element is configured to perform at least one of the following: adjusting access and mobility management policies and user terminal policies to deny multiple user terminals from sending network access requests at the same time; adjusting session management policies to temporarily restrict designated non-time-sensitive user devices from initiating services; adjusting session management policies to suspend the execution of current periodic synchronization services or periodic update services; adjusting session management policies to temporarily restrict services whose communication resource consumption is greater than a resource consumption threshold, and reducing the expected value of designated non-guaranteed stream bit rate non-GBR services.

[0025] In some embodiments, the network element is configured to adjust the service associated with the user database device to match the normal working mode according to the second mode switching notification message sent by the user database device.

[0026] According to a fifth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the method described in any of the above embodiments is implemented.

[0027] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 A schematic diagram of a flow chart of a fault prevention method according to an embodiment of the present disclosure;

[0030] Figure 2 A flowchart of a fault prevention method according to another embodiment of the present disclosure;

[0031] Figure 3 A schematic diagram of the structure of a user database device according to an embodiment of the present disclosure;

[0032] Figure 4 A schematic diagram of the structure of a user database device according to another embodiment of the present disclosure;

[0033] Figure 5 A schematic diagram of the structure of a communication system according to an embodiment of the present disclosure;

[0034] Figure 6 A schematic diagram of the structure of a communication system according to another embodiment of the present disclosure;

[0035] Figure 7 A schematic diagram of the structure of a communication system according to another embodiment of the present disclosure;

[0036] Figure 8 The present invention is a flowchart of a fault prevention method according to another embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0038] Unless specifically stated otherwise, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0039] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0040] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0041] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0042] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0043] Figure 1 The following is a flow chart of a fault prevention method according to an embodiment of the present disclosure. In some embodiments, the following fault prevention method is executed by a user database device.

[0044] In step 101, when a first trigger condition is satisfied, the current working mode is switched from a normal working mode to a sub-overload working mode.

[0045] It should be noted that the sub-overload working mode is a working mode different from the normal working mode and the overload working mode. In the sub-overload working mode, the network element adjusts the services associated with the user database device to effectively solve the load overload problem of the user database device caused by a large number of registrations or re-registrations.

[0046] In some embodiments, the first trigger condition includes: a preset characteristic value is greater than a preset characteristic value threshold, and a duration during which the preset characteristic value is greater than the preset characteristic value threshold exceeds a preset duration threshold.

[0047] For example, the preset characteristic value being greater than the preset characteristic value threshold includes at least one of the following:

[0048] 1) The total number of instant accesses is greater than the total number of accesses threshold;

[0049] 2) a first ratio of the instantaneous number of repeated visits to the instantaneous total number of visits is greater than a first ratio threshold;

[0050] 3) A second ratio of the instant total number of accesses to the total number of accesses at the previous moment is greater than a second ratio threshold;

[0051] 4) A third ratio of the instantaneous load to the rated load is greater than a third ratio threshold.

[0052] In step 102, a first mode switching notification message is sent to a network element so that the network element adjusts the service associated with the user database device to match the sub-overload state working mode.

[0053] In some embodiments, a first preset flag is added to a preset notification message to generate a first mode switching notification message, and then the first mode switching notification message is sent to the network element.

[0054] In some other embodiments, the first mode switching notification message is sent to the network element through preset signaling.

[0055] For example, the preset information includes subscription signaling.

[0056] In some embodiments, the user database device includes an HSS or UDM device.

[0057] In some embodiments, the network element includes at least one of a DRA (Diameter Routing Agent), an IMS (IP Multimedia Subsystem) device, and a PS (Packet Switch) domain device.

[0058] For example, PS domain devices include AMF (Access and Mobilitymanagement Function), SMF (Session Management Function), PCF (Policy Control Function) and other devices in 5GC (5G Core, 5G core network) and MME (Mobile Managenment Entity), S-GW (Serving GateWay), P-GW (PDN GateWay), PCRF (Policy and Charging Rule Function) and other devices in EPC (Evolved Packet Core, Evolved Packet Core Network).

[0059] Figure 2 The following is a flow chart of a fault prevention method according to another embodiment of the present disclosure. In some embodiments, the following fault prevention method is executed by a user database device.

[0060] In step 201, when a second trigger condition is satisfied, the current working mode is switched from the sub-overload working mode to the normal working mode.

[0061] In some embodiments, the second trigger condition includes: the preset characteristic value is not greater than the preset characteristic value threshold, and the duration of the preset characteristic value being not greater than the preset characteristic value threshold exceeds a preset duration threshold.

[0062] For example, the preset characteristic value is not greater than the preset characteristic value threshold value includes at least one of the following:

[0063] 1) The total number of instant accesses is not greater than the total number of accesses threshold;

[0064] 2) a first ratio of the instantaneous repeated access number to the instantaneous total access number is not greater than a first ratio threshold;

[0065] 3) A second ratio of the instant total number of accesses to the total number of accesses at the previous moment is not greater than a second ratio threshold;

[0066] 4) A third ratio of the instantaneous load to the rated load is not greater than a third ratio threshold.

[0067] In step 202, a second mode switching notification message is sent to the network element so that the network element adjusts the service associated with the user database device to match the normal working mode.

[0068] In some embodiments, a second preset flag is added to the preset notification message to generate a second mode switching notification message, and then the second mode switching notification message is sent to the network element.

[0069] In other embodiments, the second mode switching notification message is sent to the network element through preset signaling.

[0070] For example, the preset information includes subscription signaling.

[0071] In some embodiments, the user database device includes an HSS or UDM device.

[0072] In some embodiments, the network element includes at least one of a DRA, an IMS device, and a PS domain device.

[0073] Figure 3 FIG. 1 is a schematic diagram of the structure of a user database device according to an embodiment of the present disclosure. Figure 3 As shown, the user database device includes a first processing module 31 and a second processing module 32 .

[0074] The first processing module 31 switches the current working mode from the normal working mode to the sub-overload working mode when the first trigger condition is satisfied.

[0075] In some embodiments, the first trigger condition includes: a preset characteristic value is greater than a preset characteristic value threshold, and a duration during which the preset characteristic value is greater than the preset characteristic value threshold exceeds a preset duration threshold.

[0076] For example, the preset characteristic value being greater than the preset characteristic value threshold includes at least one of the following:

[0077] 1) The total number of instant accesses is greater than the total number of accesses threshold;

[0078] 2) a first ratio of the instantaneous number of repeated visits to the instantaneous total number of visits is greater than a first ratio threshold;

[0079] 3) A second ratio of the instant total number of accesses to the total number of accesses at the previous moment is greater than a second ratio threshold;

[0080] 4) A third ratio of the instantaneous load to the rated load is greater than a third ratio threshold.

[0081] The second processing module 32 sends the first mode switching notification message to the network element so that the network element adjusts the service associated with the user database device to match the sub-overload state working mode.

[0082] In some embodiments, a first preset flag is added to a preset notification message to generate a first mode switching notification message, and then the first mode switching notification message is sent to the network element.

[0083] In some other embodiments, the first mode switching notification message is sent to the network element through preset signaling.

[0084] For example, the preset information includes subscription signaling.

[0085] In some embodiments, the user database device includes an HSS or UDM device.

[0086] In some embodiments, the network element includes at least one of a DRA, an IMS device, and a PS domain device.

[0087] In some embodiments, when the second trigger condition is satisfied, the first processing module 31 switches the current working mode from the sub-overload working mode to the normal working mode.

[0088] In some embodiments, the second trigger condition includes: the preset characteristic value is not greater than the preset characteristic value threshold, and the duration of the preset characteristic value being not greater than the preset characteristic value threshold exceeds a preset duration threshold.

[0089] For example, the preset characteristic value is not greater than the preset characteristic value threshold value includes at least one of the following:

[0090] 1) The total number of instant accesses is not greater than the total number of accesses threshold;

[0091] 2) a first ratio of the instantaneous repeated access number to the instantaneous total access number is not greater than a first ratio threshold;

[0092] 3) A second ratio of the instant total number of accesses to the total number of accesses at the previous moment is not greater than a second ratio threshold;

[0093] 4) A third ratio of the instantaneous load to the rated load is not greater than a third ratio threshold.

[0094] The second processing module 32 sends the second mode switching notification message to the network element so that the network element adjusts the service associated with the user database device to match the normal working mode.

[0095] In some embodiments, a second preset flag is added to the preset notification message to generate a second mode switching notification message, and then the second mode switching notification message is sent to the network element.

[0096] In other embodiments, the second mode switching notification message is sent to the network element through preset signaling.

[0097] For example, the preset information includes subscription signaling.

[0098] Figure 4 FIG. 1 is a schematic diagram of the structure of a user database device according to another embodiment of the present disclosure. Figure 4 As shown, the user database device includes a memory 41 and a processor 42 .

[0099] The memory 41 is used to store instructions. The processor 42 is coupled to the memory 41. The processor 42 is configured to execute the instructions stored in the memory to implement the following. Figure 1 or Figure 2 The method of any one of the embodiments.

[0100] like Figure 4 As shown, the user database device also includes a communication interface 43 for information exchange with other devices. At the same time, the user database device also includes a bus 44, through which the processor 42, the communication interface 43, and the memory 41 communicate with each other.

[0101] The memory 41 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory. The memory 41 may also be a memory array. The memory 41 may also be divided into blocks, and the blocks may be combined into virtual volumes according to certain rules.

[0102] In addition, the processor 42 may be a central processing unit (CPU), or may be an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present disclosure.

[0103] The present disclosure also relates to a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, which are executed by a processor to implement the following Figure 1 or Figure 2 The method of any one of the embodiments.

[0104] Figure 5 FIG. 1 is a schematic diagram of the structure of a communication system according to an embodiment of the present disclosure. Figure 5 As shown, the communication system includes a user database device 51 and a network element 52. The user database device 51 is Figure 3 or Figure 4 The user database device involved in any one of the embodiments.

[0105] The network element 52 is configured to adjust the service associated with the user database device 51 to match the sub-overload state working mode according to the first mode switching notification message sent by the user database device 51 .

[0106] In some embodiments, the network element 52 is configured to extend the timeout determination period according to the requirements or preset agreements of the user database device 51. Thus, the registration request or query request may not be determined as timeout even if no response is received, so as to reduce the occurrence of timeout retransmission.

[0107] In some embodiments, the network element 52 is configured to reduce unnecessary access requests to the user database device according to the requirements or preset agreements of the user database device 51. For example, the occurrence of periodic information synchronization or periodic information update can be reduced.

[0108] In some embodiments, the network element 52 is configured to adjust the service associated with the user database device to match the normal working mode according to the second mode switching notification message sent by the user database device 51 .

[0109] In some embodiments, the network element 52 includes at least one of a DRA, an IMS device, and a PS domain device.

[0110] For example, Figure 6 The user database device 51 sends the first mode switching notification message to the DRA 61 , the IMS device 62 and the PS domain device 63 .

[0111] Figure 7 The present invention is a schematic diagram of the structure of a communication system according to another embodiment of the present invention. Figure 7 and Figure 6 The difference is that in Figure 7 In the illustrated embodiment, the communication system further includes an access network device 64 .

[0112] The PS domain device 63 adjusts the access policy or service policy of the user terminal according to the first mode switching notification message, and sends the adjusted access policy or service policy to the access network device 64 .

[0113] The access network device 64 is configured to control the access operation or service operation of the user terminal according to the adjusted access policy or service policy.

[0114] For example, the access network equipment 64 includes wireless access network equipment, fixed network access equipment, satellite access equipment, and various converged access network equipment.

[0115] In some embodiments, the PS domain device 63 performs at least one of the following:

[0116] 1) Adjust access and mobility management policies and user terminal policies to prevent multiple user terminals from sending network access requests at the same time.

[0117] For example, in a scenario where a large number of IoT (Internet of Things) devices access the network and access UDM devices, it is possible to effectively reject simultaneous network access requests from a large number of IoT devices.

[0118] 2) Adjust the session management policy to temporarily restrict designated non-time-sensitive user devices from initiating services.

[0119] For example, non-time-sensitive user devices include low-frequency IoT devices.

[0120] 3) Adjust the session management policy to temporarily suspend the current periodic synchronization service or periodic update service.

[0121] For example, periodic synchronization services or periodic update services include meter reading services, environmental sensor periodic reporting services, etc.

[0122] 4) Adjust the session management policy to temporarily restrict services whose communication resource consumption is greater than the resource consumption threshold, and reduce the expected value of the specified non-GBR (non-Guaranteed Bit Rate) services.

[0123] For example, services whose communication resource consumption is greater than the resource consumption threshold include AI (Artificial Intelligence) / ML (Machine Learning) services, federated learning services, XR (Extended Reality) services, etc.

[0124] Figure 8 The present invention is a flowchart of a fault prevention method according to another embodiment of the present invention.

[0125] In step 801, when a first trigger condition is satisfied, the user database device switches the current working mode from the normal working mode to the sub-overload working mode.

[0126] For example, the user database device includes an HSS or a UDM device.

[0127] In some embodiments, the first trigger condition includes: a preset characteristic value is greater than a preset characteristic value threshold, and a duration during which the preset characteristic value is greater than the preset characteristic value threshold exceeds a preset duration threshold.

[0128] For example, the preset characteristic value being greater than the preset characteristic value threshold includes at least one of the following:

[0129] 1) The total number of instant accesses is greater than the total number of accesses threshold;

[0130] 2) a first ratio of the instantaneous number of repeated visits to the instantaneous total number of visits is greater than a first ratio threshold;

[0131] 3) A second ratio of the instant total number of accesses to the total number of accesses at the previous moment is greater than a second ratio threshold;

[0132] 4) A third ratio of the instantaneous load to the rated load is greater than a third ratio threshold.

[0133] In step 802, the user database device sends a mode switching notification message to the DRA, the IMS device and the PS domain device.

[0134] In step 803a, the DRA adjusts the service associated with the user database device to match the sub-overload state working mode.

[0135] In step 803b, the IMS device adjusts the service associated with the user database device to match the sub-overload state working mode.

[0136] In step 803c, the PS domain device adjusts the service associated with the user database device to match the sub-overload state working mode.

[0137] In step 804, the PS domain device adjusts the access policy or service policy of the user terminal.

[0138] In some embodiments, the PS domain device performs at least one of the following:

[0139] 1) Adjust access and mobility management policies and user terminal policies to prevent multiple user terminals from sending network access requests at the same time.

[0140] 2) Adjust the session management policy to temporarily restrict designated non-time-sensitive user devices from initiating services.

[0141] 3) Adjust the session management policy to temporarily suspend the current periodic synchronization service or periodic update service.

[0142] 4) Adjust the session management policy to temporarily restrict services whose communication resource consumption is greater than the resource consumption threshold and reduce the expected value of the specified non-GBR services.

[0143] In step 805, the PS domain device sends the adjusted access policy or service policy to the access network device.

[0144] In step 806, the access network device controls the access operation or service operation of the user terminal according to the adjusted access policy or service policy.

[0145] In some embodiments, the functional unit described above can be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof for performing the functions described in the present disclosure.

[0146] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0147] The description of the present disclosure is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present disclosure to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present disclosure, and to enable those of ordinary skill in the art to understand the present disclosure and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A fault prevention method, performed by a user database device, comprising: When the first trigger condition is met, the current working mode is switched from the normal working mode to the sub-overload working mode; A first mode switching notification message is sent to a network element so that the network element adjusts a service associated with the user database device to match the sub-overload state working mode.

2. The method according to claim 1, wherein: The first trigger condition includes: a preset characteristic value is greater than a preset characteristic value threshold, and a duration during which the preset characteristic value is greater than the preset characteristic value threshold exceeds a preset duration threshold.

3. The method according to claim 2, wherein: The preset characteristic value being greater than the preset characteristic value threshold includes at least one of the following: The instant total number of visits is greater than the total number of visits threshold; A first ratio of the instantaneous number of repeated visits to the instantaneous total number of visits is greater than a first ratio threshold; A second ratio of the instant total number of accesses to the total number of accesses at the previous moment is greater than a second ratio threshold; A third ratio of the instantaneous load to the rated load is greater than a third ratio threshold.

4. The method according to claim 1, wherein: Sending the first mode switching notification message to the network element includes: Adding a first preset identification bit to a preset notification message to generate the first mode switching notification message; Sending the first mode switching notification message to the network element.

5. The method according to claim 1, wherein: Sending the first mode switching notification message to the network element includes: The first mode switching notification message is sent to the network element through preset signaling.

6. The method according to claim 1, further comprising: When the second trigger condition is met, the current working mode is switched from the sub-overload working mode to the normal working mode; A second mode switching notification message is sent to the network element so that the network element adjusts the service associated with the user database device to match the normal working mode.

7. The method according to claim 6, wherein: The second trigger condition includes: a preset characteristic value is not greater than a preset characteristic value threshold, and a duration during which the preset characteristic value is not greater than the preset characteristic value threshold exceeds a preset duration threshold.

8. The method according to claim 7, wherein: The preset characteristic value is not greater than the preset characteristic value threshold value, including at least one of the following: The total number of instant accesses is not greater than the total number of accesses threshold; A first ratio of the instantaneous repeated access number to the instantaneous total access number is not greater than a first ratio threshold; A second ratio of the instant total number of accesses to the total number of accesses at the previous moment is not greater than a second ratio threshold; A third ratio of the instantaneous load to the rated load is not greater than a third ratio threshold.

9. The method according to claim 6, wherein: Sending the second mode switching notification message to the network element includes: Adding a second preset flag to a preset notification message to generate the second mode switching notification message; Sending the second mode switching notification message to the network element.

10. The method according to claim 6, wherein: Sending the second mode switching notification message to the network element includes: The second mode switching notification message is sent to the network element through preset signaling.

11. The method according to any one of claims 1 to 10, wherein: The user database device includes a user home server HSS or a unified data management UDM device.

12. The method according to any one of claims 1 to 10, wherein: The network element includes at least one of a routing agent node DRA, an IP multimedia subsystem IMS device and a packet switching PS domain device.

13. A user database device, comprising: A first processing module is configured to switch the current working mode from the normal working mode to the sub-overload working mode when a first trigger condition is met; The second processing module is configured to send a first mode switching notification message to a network element so that the network element adjusts the service associated with the user database device to match the sub-overload state working mode.

14. A user database device, comprising: Memory; A processor is coupled to the memory, and the processor is configured to execute the method according to any one of claims 1 to 12 based on instructions stored in the memory.

15. A communication system comprising: The user database device as claimed in claim 13 or 14; The network element is configured to adjust the service associated with the user database device to match the sub-overload state working mode according to the first mode switching notification message sent by the user database device.

16. The system of claim 15, wherein: The network element is configured to extend the timeout recognition duration according to the requirement of the user database device or a preset agreement.

17. The system of claim 15, wherein: The network element is configured to reduce unnecessary access requests to the user database device according to requirements or preset agreements of the user database device.

18. The system according to any one of claims 15 to 17, wherein: The network element includes at least one of a routing agent node DRA, an IP multimedia subsystem IMS device and a packet switching PS domain device.

19. The system according to claim 18, further comprising an access network device, wherein: The network element is configured to adjust the access policy or service policy of the user terminal when belonging to the PS domain device, and send the adjusted access policy or service policy to the access network device; The access network device is configured to control the access operation or service operation of the user terminal according to the adjusted access policy or service policy.

20. The system of claim 19, wherein: The network element is configured to perform at least one of the following: adjusting access and mobility management policies and user terminal policies to deny multiple user terminals from sending network access requests at the same time; adjusting session management policies to temporarily restrict designated non-time-sensitive user equipment from initiating services; adjusting session management policies to suspend execution of current periodic synchronization services or periodic update services; adjusting session management policies to temporarily restrict services whose communication resource consumption is greater than a resource consumption threshold, and reducing the expected value of designated non-guaranteed stream bit rate non-GBR services.

21. The system of claim 15, wherein: The network element is configured to adjust the service associated with the user database device to match the normal working mode according to the second mode switching notification message sent by the user database device.

22. A computer-readable storage medium, wherein: The computer-readable storage medium stores computer instructions, and when the instructions are executed by a processor, the method according to any one of claims 1 to 12 is implemented.

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