Normal offline data synchronization method and system, electronic equipment and medium

Abstract

The invention provides a normal off-line data synchronization method and system, electronic equipment and a storage medium, and aims to solve the problems of security risks and incapability of meeting network privacy requirements during data synchronization between a core UDM and an edge UDM, the method is applied to an SFTP proxy server, the SFTP proxy server is respectively connected with an SFTP server and an edge UDM network element, the SFTP server is connected with a core UDM network element, and the core UDM network element is connected with the edge UDM network element. The method comprises the following steps: splitting a data synchronization process of a core UDM network element and an edge UDM network element; acquiring synchronous data from the core UDM network element, and disconnecting with the edge UDM network element when acquiring the synchronous data; and synchronizing the synchronization data to the edge UDM network element, and disconnecting with the core UDM network element when the synchronization data is synchronized with the edge UDM network element. The transmission process between the core UDM and the edge UDM is safer, and the normalized offline requirement of the edge UDM is met.

Description

Technical Field

[0001] The present disclosure relates to the technical field of communication networks, and in particular to a normal offline data synchronization method, a normal offline data synchronization system, an electronic device, and a computer-readable storage medium. Background Art

[0002] The Unified Data Management (UDM) network element is one of the key components in the 5G core network, responsible for storing user subscription data and performing authentication operations. The UDM network element can receive the authentication information sent by the user device and compare it with the registration information pre-stored in the network element. If the two are consistent, the UDM network element can confirm that the user device has passed the authentication. After the authentication is passed, the UDM network element will provide the user with corresponding services based on the service information in the user subscription data.

[0003] Since some network users have high requirements for network reliability in the actual production process, there is a need to establish an independent sinking 5G private network, that is, the 5G core network needs to be deployed separately in the user's production environment. In the sinking 5G private network, a UDM network element is required to manage the data of the user's independent private network, forming a "center-edge" topology with the public network UDM. Among them, the edge UDM network element will obtain the user registration information and contract data in its corresponding subnet from the core UDM network element, and execute the relevant functions of the UDM network element in its corresponding subnet based on this information. In addition, in application scenarios with high requirements for network privacy, maintaining a normal connection between the core UDM and the local edge UDM will cause the network risks between the two to spread to each other, and at the same time reduce the concealment of the local network and increase the burden on the core UDM. Therefore, the edge UDM needs to be offline in normal state and connect only when data synchronization with the core UDM is required. Such offline data synchronization requirements bring new challenges to UDM networking.

[0004] Currently, there are two synchronization methods between the core UDM network elements and the edge UDM network elements: point-to-point direct connection synchronization and synchronization with the help of SFTP servers. In the point-to-point direct connection method, the core UDM determines the data to be synchronized based on the preset synchronization trigger conditions, and sends the data to be synchronized directly to the edge UDM. In the synchronization with the help of SFTP (Secure Shell File Transfer Protocol, SSH file transfer protocol) server, the core UDM encrypts and saves the data to be synchronized through the SFTP server, and the edge UDM obtains the corresponding encrypted data file from the SFTP server for decryption processing, and finally completes the synchronization.

[0005] The existing technical solutions for point-to-point direct synchronization between the core UDM and the edge UDM have three main shortcomings: The first is security risks; direct connection means that the data transmission process between the core UDM and the edge UDM is more exposed and easy to become the target of attackers. The unencrypted data synchronization process may cause data to be eavesdropped, tampered with or intercepted, increasing the risk of information leakage and data integrity damage. The second aspect is limited expansion; as the network scale expands, when more edge UDM network elements are needed to be added to the system, the direct connection data synchronization method is difficult to adapt to large-scale expansion, which puts the core UDM load under tremendous pressure. The third aspect is complex management; maintaining direct connections between the core UDM and multiple edge UDMs requires complex management configuration, especially in the case of complex network topology or wide geographical distribution. Failure or configuration errors at any connection point may affect the stability of the overall system.

[0006] However, synchronization with the SFTP server requires the core UDM and edge UDM to remain connected to the Internet, which cannot meet the differentiated needs of network users who want the edge UDM to remain offline in scenarios with high requirements for network privacy. Summary of the invention

[0007] In order to at least solve the security risks, limited expansion and complex management encountered in the data synchronization between the core UDM and the edge UDM in the prior art, and the problem of being unable to meet the network privacy requirements. The present disclosure provides a normal offline data synchronization method, a normal offline data synchronization system, an electronic device and a computer-readable storage medium, which effectively prevents data leakage during transmission, can make the transmission process between the core UDM and the edge UDM more secure, and meet the normalized offline requirements of the edge UDM due to security or privacy requirements.

[0008] In a first aspect, the present disclosure provides a normal offline data synchronization method, which is applied to an SFTP proxy server, wherein the SFTP proxy server is connected to an SFTP server and an edge UDM network element respectively, and the SFTP server is connected to a core UDM network element, and the method includes:

[0009] Split the data synchronization process between the core UDM network elements and the edge UDM network elements;

[0010] Acquire synchronization data from the core UDM network element, and disconnect from the edge UDM network element when acquiring synchronization data from the core UDM network element;

[0011] Synchronize the synchronization data to the edge UDM NE and disconnect from the core UDM NE when synchronizing the data with the edge UDM NE.

[0012] Further, the acquiring synchronization data from the core UDM network element and disconnecting from the edge UDM network element when acquiring the synchronization data of the core UDM network element includes:

[0013] Receive data synchronization requests sent by edge UDM network elements to SFTP proxy servers;

[0014] After disconnecting from the edge UDM network element, it connects to the SFTP server and sends a data synchronization request to the business operation system, so that the business operation system sends a data synchronization instruction to the core UDM network element, and the core UDM network element encrypts the data to be synchronized according to the data synchronization request of the edge UDM network element using the encryption key sent to the core UDM network element by the key server, obtains the synchronization data ciphertext, and sends the synchronization data ciphertext to the SFTP server;

[0015] Download the synchronization data ciphertext from the SFTP server.

[0016] Further, synchronizing the synchronization data to the edge UDM network element and disconnecting from the core UDM network element during data synchronization includes:

[0017] Get the decryption key from the key server;

[0018] Disconnect from the SFTP server to disconnect from the core UDM network element;

[0019] Connect with the edge UDM network element and decrypt the synchronization data ciphertext to obtain the synchronization data plaintext;

[0020] Synchronize the synchronization data in plain text to the edge UDM network element to complete data synchronization.

[0021] In a second aspect, the present disclosure provides a normal offline data synchronization system, the system comprising an SFTP proxy server, the SFTP proxy server being connected to an SFTP server and an edge UDM network element respectively, the SFTP server being connected to a core UDM network element, and the SFTP proxy server comprising:

[0022] A splitting module configured to split the data synchronization process between the core UDM network element and the edge UDM network element;

[0023] An acquisition module, which is configured to acquire synchronization data from a core UDM network element, and disconnect from an edge UDM network element when acquiring synchronization data from the core UDM network element;

[0024] The synchronization module is configured to synchronize synchronization data to the edge UDM network element and disconnect from the core UDM network element when synchronizing with the edge UDM network element data.

[0025] Furthermore, the acquisition module is specifically configured as follows:

[0026] Receive data synchronization requests sent by edge UDM network elements to SFTP proxy servers;

[0027] After disconnecting from the edge UDM network element, it connects to the SFTP server and sends a data synchronization request to the business operation system, so that the business operation system sends a data synchronization instruction to the core UDM network element, and the core UDM network element encrypts the data to be synchronized according to the data synchronization request of the edge UDM network element using the encryption key sent to the core UDM network element by the key server, obtains the synchronization data ciphertext, and sends the synchronization data ciphertext to the SFTP server;

[0028] Download the synchronization data ciphertext from the SFTP server.

[0029] Furthermore, the synchronization module is specifically configured as follows:

[0030] Get the decryption key from the key server;

[0031] Disconnect from the SFTP server to disconnect from the core UDM network element;

[0032] Connect with the edge UDM network element and decrypt the synchronization data ciphertext to obtain the synchronization data plaintext;

[0033] Synchronize the synchronization data in plain text to the edge UDM network element to complete data synchronization.

[0034] In a third aspect, the present disclosure provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the normal offline data synchronization method as described in any one of the first aspects.

[0035] In a fourth aspect, the present disclosure provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the normal offline data synchronization method described in any one of the above-mentioned first aspects is implemented.

[0036] Beneficial effects:

[0037] The present disclosure provides a normal offline data synchronization method, a normal offline data synchronization system, an electronic device, and a storage medium. Relaying through an SFTP proxy server can ensure that during the data synchronization process, the edge UDM remains in a normal offline state, can transmit data safely, and maintains good expansion potential. When the network scale expands, the new edge UDM only needs to connect to the SFTP server through the SFTP proxy server, which will not cause additional load pressure on the core UDM. In the subsequent network maintenance process, the configuration of the core UDM does not need to be changed, and only the configuration of the SFTP proxy server corresponding to the edge UDM needs to be changed. The whole process is easy to maintain and can significantly improve the security and efficiency of data synchronization. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A flowchart of a normal offline data synchronization method provided in Embodiment 1 of the present disclosure;

[0039] Figure 2 A schematic diagram of a normal offline data synchronization system provided by an embodiment of the present disclosure;

[0040] Figure 3 A schematic diagram of an offline synchronization process between edge UDM and core UDM data based on an SFTP proxy server provided in an embodiment of the present disclosure;

[0041] Figure 4 A flowchart of a normal offline data synchronization method provided in Embodiment 2 of the present disclosure;

[0042] Figure 5 This is an architecture diagram of an SFTP proxy server provided in Embodiment 3 of the present disclosure;

[0043] Figure 6 This is an architecture diagram of an electronic device provided in Embodiment 4 of the present disclosure. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments and drawings described herein are only used to explain the present invention, rather than to limit the present invention.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence; and, in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be arbitrarily combined with each other.

[0046] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms of "a", "said" and "the" used in the embodiments of the present disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings.

[0047] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present disclosure, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0048] The technical solution of the present invention and how the technical solution of the present invention solves the above-mentioned problems existing in the prior art are described in detail below with specific embodiments. It is understandable that in the embodiments of the present application, the execution subject can perform some or all of the steps in the embodiments of the present application, and these steps or operations are only examples. The embodiments of the present application can also perform other operations or deformations of various operations. In addition, each step can be performed in a different order presented in the embodiments of the present application, and it is possible not to perform all the operations in the embodiments of the present application. And, the following several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0049] Figure 1 A flow chart of a normal offline data synchronization method provided in the first embodiment of the present disclosure is applied to an SFTP proxy server, wherein the SFTP proxy server is connected to an SFTP server and an edge UDM network element respectively, and the SFTP server is connected to a core UDM network element, such as Figure 1 As shown, the method includes:

[0050] Step S101: splitting the data synchronization process between the core UDM network element and the edge UDM network element;

[0051] Step S102: Acquire synchronization data from the core UDM network element, and disconnect from the edge UDM network element when acquiring the synchronization data of the core UDM network element;

[0052] Step S103: Synchronize the synchronization data to the edge UDM network element, and disconnect from the core UDM network element when synchronizing with the edge UDM network element data.

[0053] SFTP is a secure file transfer protocol based on SSH (Secure Shell). Using the SFTP protocol can provide a secure network encryption algorithm during the file transfer process, thereby ensuring the secure transmission of data.

[0054] The disclosed embodiment uses an SFTP proxy server to relay between the core UDM network element and the edge UDM network element, splitting the data synchronization process between the core UDM and the edge UDM into a data transmission process between the core UDM network element and the SFTP proxy server and a data transmission process between the SFTP proxy server and the edge UDM network element; when the core UDM network element imports data to the SFTP proxy server through the SFTP server, the SFTP proxy server is disconnected from the edge UDM, and when the edge UDM network element downloads data from the SFTP proxy server, the SFTP proxy server is disconnected from the core UDM, thereby maintaining the normalized offline state of the edge UDM while achieving data synchronization between the core UDM and the edge UDM.

[0055] Further, the acquiring synchronization data from the core UDM network element and disconnecting from the edge UDM network element when acquiring the synchronization data of the core UDM network element includes:

[0056] Receive data synchronization requests sent by edge UDM network elements to SFTP proxy servers;

[0057] After disconnecting from the edge UDM network element, it connects to the SFTP server and sends a data synchronization request to the business operation system, so that the business operation system sends a data synchronization instruction to the core UDM network element, and the core UDM network element encrypts the data to be synchronized according to the data synchronization request of the edge UDM network element using the encryption key sent to the core UDM network element by the key server, obtains the synchronization data ciphertext, and sends the synchronization data ciphertext to the SFTP server;

[0058] Download the synchronization data ciphertext from the SFTP server.

[0059] The present disclosure embodiment is as follows Figure 2 The system shown is implemented, including a core end, a relay end and an edge end. The core end includes a core UDM network element and an SFTP server. The data interaction between the UDM network element and the SFTP server is based on the characteristics of SFTP to ensure the security of data transmission. The relay end includes an SFTP proxy server. The SFTP proxy server and the core UDM network element are respectively connected to the key server to realize data encryption and decryption. The SFTP server and the core UDM network element are both connected to the business operation system. The SFTP proxy server can send a data synchronization request to the business operation system through the SFTP server, thereby sending a data synchronization instruction to the core UDM; the edge end is the edge UDM.

[0060] When the edge UDM needs to obtain user registration information and contract data in its corresponding subnet from the core UDM network element, so as to execute the relevant functions of the UDM network element in its corresponding subnet based on this information; the edge UDM sends a data synchronization request to the SFTP proxy server. After receiving the synchronization request, the SFTP proxy server first disconnects from the edge UDM and then connects to the SFTP server to complete the subsequent synchronization data ciphertext obtained from the core UDM network element. All transmitted data is encrypted end-to-end.

[0061] Further, synchronizing the synchronization data to the edge UDM network element and disconnecting from the core UDM network element during data synchronization includes:

[0062] Get the decryption key from the key server;

[0063] Disconnect from the SFTP server to disconnect from the core UDM network element;

[0064] Connect with the edge UDM network element and decrypt the synchronization data ciphertext to obtain the synchronization data plaintext;

[0065] Synchronize the synchronization data in plain text to the edge UDM network element to complete data synchronization.

[0066] The SFTP proxy server obtains the synchronization data ciphertext and the decryption key from the key server; disconnects from the SFTP server, connects to the edge UDM and decrypts the synchronization data ciphertext, obtains the synchronization data plaintext and synchronizes it to the edge UDM. This allows the edge UDM to be offline normally, the core UDM and the edge UDM will not remain connected to the network, and data synchronization can be achieved.

[0067] The disclosed embodiment enables the edge UDM to complete data synchronization with the core UDM while maintaining a normalized offline state. It can also achieve secure data transmission, and maintain good expansion potential based on the SFTP proxy server. The edge UDM can be managed by simply changing the configuration of the SFTP proxy server corresponding to the edge UDM; it can easily perform configuration management of the core UDM and edge UDM.

[0068] The second embodiment of the present disclosure also provides a normal offline data synchronization method to solve the security risks, expansion limitations and management complexity problems encountered when synchronizing data between the core UDM and the edge UDM, so that the edge UDM can be in a normal offline state while completing data synchronization with the core UDM. Figure 3As shown, the SFTP proxy server is used to relay between the core UDM network element and the edge UDM network element, and the data synchronization process between the core UDM and the edge UDM is split. When the core UDM network element imports data to the SFTP proxy server, the SFTP proxy server is disconnected from the edge UDM. When the edge UDM network element downloads data from the SFTP proxy server, the SFTP proxy server is disconnected from the core UDM.

[0069] The specific process is as follows Figure 4 As shown, including:

[0070] S1: The edge UDM sends a data synchronization request to the SFTP proxy server. The SFTP proxy server disconnects from the edge UDM and then connects to the SFTP server, and sends a data synchronization request to the business operation system.

[0071] S2: The business operation system sends a data synchronization instruction to the core UDM.

[0072] S3: The core UDM receives the encryption key sent by the key server based on the data synchronization request of the edge UDM, and uses the encryption key to encrypt the data to be synchronized to obtain the synchronized data ciphertext.

[0073] S4: The core UDM sends the synchronization data encrypted text to the SFTP server.

[0074] S5: The SFTP proxy server downloads the synchronization data ciphertext from the SFTP server.

[0075] S6: The SFTP proxy server obtains the decryption key from the key server.

[0076] S7: The SFTP proxy server disconnects from the SFTP server.

[0077] S8: The SFTP proxy server connects to the edge UDM and decrypts the synchronization data ciphertext to obtain the synchronization data plaintext.

[0078] S9: The edge UDM obtains the plain text of the synchronization data from the SFTP proxy server and completes data synchronization.

[0079] The third embodiment of the present disclosure also provides a normal offline data synchronization system, the system includes an SFTP proxy server, the SFTP proxy server is connected to the SFTP server and the edge UDM network element respectively, and the SFTP server is connected to the core UDM network element, such as Figure 5 As shown, the SFTP proxy server includes:

[0080] A splitting module 11, which is configured to split the data synchronization process between the core UDM network element and the edge UDM network element;

[0081] An acquisition module 12, which is configured to acquire synchronization data from a core UDM network element, and disconnect from an edge UDM network element when acquiring synchronization data from the core UDM network element;

[0082] The synchronization module 13 is configured to synchronize synchronization data to the edge UDM network element, and disconnect from the core UDM network element when synchronizing with the edge UDM network element data.

[0083] Furthermore, the acquisition module 12 is specifically configured as follows:

[0084] Receive data synchronization requests sent by edge UDM network elements to SFTP proxy servers;

[0085] After disconnecting from the edge UDM network element, it connects to the SFTP server and sends a data synchronization request to the business operation system, so that the business operation system sends a data synchronization instruction to the core UDM network element, and the core UDM network element encrypts the data to be synchronized according to the data synchronization request of the edge UDM network element using the encryption key sent to the core UDM network element by the key server, obtains the synchronization data ciphertext, and sends the synchronization data ciphertext to the SFTP server;

[0086] Download the synchronization data ciphertext from the SFTP server.

[0087] Furthermore, the synchronization module 13 is specifically configured as follows:

[0088] Get the decryption key from the key server;

[0089] Disconnect from the SFTP server to disconnect from the core UDM network element;

[0090] Connect with the edge UDM network element and decrypt the synchronization data ciphertext to obtain the synchronization data plaintext;

[0091] Synchronize the synchronization data in plain text to the edge UDM network element to complete data synchronization.

[0092] The normal offline data synchronization system of the disclosed embodiment is used to implement the normal offline data synchronization method in method embodiment 1 and embodiment 2, so the description is relatively simple. For details, please refer to the relevant description in the previous method embodiment, which will not be repeated here.

[0093] In addition, if Figure 6 As shown, the fourth embodiment of the present disclosure further provides an electronic device, including a memory 100 and a processor 200, wherein the memory 100 stores a computer program, and when the processor 200 runs the computer program stored in the memory 100, the processor 200 executes the above-mentioned various possible methods.

[0094] The memory 100 is connected to the processor 200. The memory 100 may be a flash memory, a read-only memory or other memory, and the processor 200 may be a central processing unit or a single-chip microcomputer.

[0095] In addition, an embodiment of the present disclosure further provides a computer-readable storage medium, on which a computer program is stored, and the computer program is executed by a processor to perform the above-mentioned various possible methods.

[0096] The computer-readable storage medium includes volatile or non-volatile, removable or non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, computer program modules or other data). Computer-readable storage media include, but are not limited to, RAM (Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable read only memory), flash memory or other memory technology, CD-ROM (Compact Disc Read-Only Memory), Digital Video Disc (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer.

[0097] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A normal offline data synchronization method, characterized in that: Applied to a secure shell file transfer protocol SFTP proxy server, the SFTP proxy server is connected to an SFTP server and an edge unified data management UDM network element respectively, the SFTP server is connected to a core UDM network element, and the method includes: Split the data synchronization process between the core UDM network elements and the edge UDM network elements; Acquire synchronization data from the core UDM network element, and disconnect from the edge UDM network element when acquiring synchronization data from the core UDM network element; Synchronize the synchronization data to the edge UDM NE and disconnect from the core UDM NE when synchronizing the data with the edge UDM NE.

2. The method according to claim 1, characterized in that The acquiring synchronization data from the core UDM network element and disconnecting from the edge UDM network element when acquiring the synchronization data of the core UDM network element includes: Receive data synchronization requests sent by edge UDM network elements to SFTP proxy servers; After disconnecting from the edge UDM network element, it connects to the SFTP server and sends a data synchronization request to the business operation system, so that the business operation system sends a data synchronization instruction to the core UDM network element, and the core UDM network element encrypts the data to be synchronized according to the data synchronization request of the edge UDM network element using the encryption key sent to the core UDM network element by the key server, obtains the synchronization data ciphertext, and sends the synchronization data ciphertext to the SFTP server; Download the synchronization data ciphertext from the SFTP server.

3. The method according to claim 2, characterized in that The step of synchronizing the synchronization data to the edge UDM network element and disconnecting from the core UDM network element during data synchronization includes: Get the decryption key from the key server; Disconnect from the SFTP server to disconnect from the core UDM network element; Connect with the edge UDM network element and decrypt the synchronization data ciphertext to obtain the synchronization data plaintext; Synchronize the synchronization data in plain text to the edge UDM network element to complete data synchronization.

4. A normal offline data synchronization system, characterized in that: The system includes an SFTP proxy server, the SFTP proxy server is connected to an SFTP server and an edge UDM network element respectively, the SFTP server is connected to a core UDM network element, and the SFTP proxy server includes: A splitting module configured to split the data synchronization process between the core UDM network element and the edge UDM network element; An acquisition module, which is configured to acquire synchronization data from a core UDM network element, and disconnect from an edge UDM network element when acquiring synchronization data from the core UDM network element; The synchronization module is configured to synchronize synchronization data to the edge UDM network element and disconnect from the core UDM network element when synchronizing with the edge UDM network element data.

5. The system according to claim 4, characterized in that The acquisition module is specifically configured as follows: Receive data synchronization requests sent by edge UDM network elements to SFTP proxy servers; After disconnecting from the edge UDM network element, it connects to the SFTP server and sends a data synchronization request to the business operation system, so that the business operation system sends a data synchronization instruction to the core UDM network element, and the core UDM network element encrypts the data to be synchronized according to the data synchronization request of the edge UDM network element using the encryption key sent to the core UDM network element by the key server, obtains the synchronization data ciphertext, and sends the synchronization data ciphertext to the SFTP server; Download the synchronization data ciphertext from the SFTP server.

6. The system according to claim 5, characterized in that The synchronization module is specifically configured as follows: Get the decryption key from the key server; Disconnect from the SFTP server to disconnect from the core UDM network element; Connect with the edge UDM network element and decrypt the synchronization data ciphertext to obtain the synchronization data plaintext; Synchronize the synchronization data in plain text to the edge UDM network element to complete data synchronization.

7. An electronic device, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the normal offline data synchronization method as described in any one of claims 1-3.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the normal offline data synchronization method according to any one of claims 1 to 3 is implemented.

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