CN103200211B - A kind of method of data synchronization, system and equipment - Google Patents

Abstract

The embodiment of the invention discloses a data synchronization method and system. The method includes: the synchronization control server receives a synchronization service registration request from a synchronization client, and stores user information carried in the registration request; the synchronization control server forwards data synchronization session information between synchronization clients participating in the synchronization session according to the user information stored by itself ; According to the data synchronization session information, directly perform data transmission between the synchronization clients participating in the synchronization session. Applying the invention can reduce the pressure on the server side.

Description

A data synchronization method, system and device

technical field

The present invention relates to the field of communication technology, in particular to a data synchronization method, system and equipment.

Background technique

With the rapid development of the mobile Internet and the large-scale popularization of smart terminals, user equipment is becoming more and more diverse, and there are various forms of user equipment such as personal computers (PCs), laptop computers, smart phones, and handheld computers (PDAs). , a user often owns multiple user devices. With the continuous improvement of people's functional requirements on user equipment and the diversification of user equipment, people have a demand for data resource synchronization between different user equipment.

Currently, a solution for data synchronization between different user equipments is: data synchronization based on a client/server (C/S) model. Specifically: users save their own data on the network server, and can operate data from multiple clients, so that the unity of data on multiple clients can be maintained without operating each client separately, which simplifies user The operation process improves the efficiency and real-time requirements of users, and provides good support for mobile office.

Figure 1 is a schematic diagram of the composition of the current data synchronization system based on the C/S model.

As shown in Figure 1, the current data synchronization system based on the C/S model includes a central database server, a synchronization server, a Web server, a mobile terminal and a fixed client.

Among them, the central database server uses the Lightweight Directory Access Protocol (LDAP). LDAP directory service is a special database system, which is specially optimized for reading, browsing and searching operations, and is widely used in the management of basic and critical information, such as user information and network resource information.

The data on the central database server can be modified in two ways: ①The fixed client modifies the records in the central database through the Web server through the Web page; ②The mobile client accesses the central database through the synchronization server and synchronizes with it.

The data synchronization system shown in Figure 1 uses the syncML protocol to realize data synchronization. The SyncML synchronization protocol mainly defines the session process of data synchronization operation, the data interaction process in the session process, the handshake process between the two sides of the synchronization, and the type of data synchronization.

In the data synchronization system shown in Figure 1, during the synchronization process, the control process of data synchronization is bound to the transmission process, that is, both control information and data information need to pass through the control server, therefore, huge pressure will be generated on the server side. Specifically in:

When multiple users synchronize data with a large amount of data, the processing and storage pressure on the server side increases sharply.

In addition, the data synchronization system based on the C/S mode will also lead to the accumulation of massive data in a few computing centers, overloading the network server, while the processing capacity of a large number of terminals is idle, which is undoubtedly a huge waste; and , the weakness of the C/S model, which is vulnerable to attack, puts forward higher requirements for the robustness and security of the data synchronization system.

Contents of the invention

In view of this, the present invention provides a data synchronization method, system and equipment, so as to reduce the pressure on the server side.

Technical scheme of the present invention is specifically realized like this:

A data synchronization method, the method comprising:

The synchronization control server receives the synchronization service registration request from the synchronization client, and stores the user information carried in the registration request;

The synchronization control server forwards the data synchronization session information between the synchronization clients participating in the synchronization session according to the user information stored by itself;

According to the data synchronization session information, data transmission is directly performed between the synchronization clients participating in the synchronization session.

A data synchronization system, the system includes a synchronization control server and a synchronization client;

The synchronization control server is configured to receive a synchronization service registration request from a synchronization client, store user information carried in the registration request, and forward data synchronization session information between synchronization clients participating in the synchronization session according to the user information stored by itself;

The synchronization client is configured to directly perform data transmission with other synchronization clients participating in the synchronization session according to the data synchronization session information.

A synchronous control server, the synchronous control server includes a synchronous service registration module, a synchronous client always-on module and a synchronous session control module;

The synchronization service registration module is used to receive a synchronization service registration request from a synchronization client, and store user information of the synchronization client;

The always-on module of the synchronization client is used to receive the synchronization service registration request sent periodically by the synchronization client or when the user information of the synchronization client itself is updated, and send the synchronization service registration request to the synchronization service registration module;

The synchronization session control module is configured to receive a synchronization session establishment request from a synchronization client, query the synchronization client at the opposite end of the synchronization session according to the user information maintained by the synchronization client always-on module, and participate in the synchronization of the synchronization session Forward data synchronization session information between clients.

A synchronous client, the synchronous client includes a synchronous service registration module, an always-on module, a synchronous session control module and a data synchronous module;

The synchronization service registration module is configured to send a synchronization service registration request to the synchronization server, and the synchronization service registration request carries user information of the synchronization client;

The always-on module is configured to periodically or when the user information of the synchronization client itself is updated, send a synchronization service registration request to the synchronization control server, the synchronization service registration request carrying the user information of the synchronization client,

The synchronization session control module is used to exchange data synchronization session information with other synchronization clients participating in data synchronization through the synchronization control server when there is data that needs to be synchronized;

The data synchronization module is configured to directly perform data transmission with other synchronization clients according to the data synchronization session information.

It can be seen from the above scheme that since the data synchronization control process and the transmission process are separated in the present invention, the data transmission is directly carried out between the user equipments, thereby reducing the pressure on the server and ensuring the real-time performance of the data transmission, improving the Data synchronization efficiency.

Description of drawings

Figure 1 is a schematic diagram of the composition of the current data synchronization system based on the C/S model.

Fig. 2 is a flow chart of the data synchronization method provided by the present invention.

Fig. 3 is a detailed flowchart of data synchronization between two user equipments provided by the present invention.

Fig. 4 is a schematic diagram of the composition of the data synchronization system provided by the present invention.

Fig. 5 is a structural diagram of the synchronization control server provided by the present invention.

Fig. 6 is a structural diagram of a synchronization client provided by the present invention.

detailed description

The present invention provides a novel data synchronization method, system and equipment, which adopts a method of separating data synchronization control and transmission for data synchronization, specifically including:

The synchronization control server receives the synchronization service registration request of the synchronization client, and stores the user information carried by the registration request; the synchronization control server forwards the data synchronization session information between the synchronization clients participating in the synchronization session according to the user information stored by itself; according to the Data synchronization session information, data transmission directly between the synchronization clients participating in the synchronization session.

It can be seen that, by adopting the present invention, firstly, the user equipment does not need to save its own data on the network server. When it needs to synchronize data with other user equipment, it needs to send a control request command to the network server. When the server receives this command , according to the need to process and forward to the peer user equipment that needs data synchronization. After the control flow is established between the user equipment that needs data synchronization, the user equipment can directly perform data synchronization without going through the network server. end, thereby reducing the pressure on the server side.

In addition, since the control process of data synchronization is separated from the transmission process, data transmission is directly performed between user equipments, thereby ensuring the real-time performance of data transmission and improving the efficiency of data synchronization. Moreover, since the data is stored in the user equipment, it also provides stronger robustness and security for the data synchronization system.

Fig. 2 is a flow chart of the data synchronization method provided by the present invention.

As shown in Figure 2, the process includes:

In step 201, the user equipment initiates synchronization service registration with the synchronization control server, and keeps the user equipment always online.

In this step, the user equipment can keep the user equipment always online by periodically sending a synchronization service registration request to the synchronization control server, that is, keep information such as the IP address and port number of the user equipment stored in the synchronization control server . The user equipment can also keep the user equipment always online by sending a synchronization service registration request to the synchronization control server when its own information changes, and carrying its own updated information in the synchronization service registration request.

Wherein, the synchronization service registration request may be a Session Initiation Protocol (Session Initiation Protocol, SIP) registration message.

In step 202, the user equipment exchanges data synchronization session information with another user equipment through the synchronization control server, so as to establish a data synchronization session between the user equipments.

Step 203, according to the data synchronization session information, directly perform data transmission between user equipments.

Step 204, when the data synchronization session needs to be terminated, the user equipment terminates the synchronization session with another user equipment through the synchronization control server.

A specific example is given below to illustrate the data synchronization method provided by the present invention, please refer to FIG. 3 for details.

Fig. 3 is a detailed flowchart of data synchronization between two user equipments provided by the present invention.

The process shown in Figure 3 includes four stages: Step 1-Step 10 corresponds to Step 201 in Figure 2, which is the stage for the user equipment to register for the synchronization service and keep the terminal always online, and Step 11-Step 18 corresponds to the steps in Figure 2 202 is the stage of acquiring data synchronization session control information. Step 19 corresponds to step 203 in FIG. 2, which is the stage of establishing a data synchronization session between user equipments and directly performing data transmission. Step 204 is the stage of ending the data synchronization session.

As shown in Figure 3, the process specifically includes the following steps:

Step 1: User Equipment 1 (UE1) sends a registration request (REGISTER) to the synchronization control server, the purpose of which is to allow the synchronization control server to obtain the registration information of the current user.

The registration information generally includes the IP address, port number, etc. of the user equipment.

Step 2: The synchronization control server passes the back-end authentication and knows that the user's IP address is not in the database, so it returns a 401 Unauthenticated challenge message to UE1, including the token required for security authentication.

Step 3: After UE1 encrypts its ID and password according to the security authentication token, it reports to the synchronization control server again with a REGISTER message.

Step 4: The synchronization control server decrypts the user information in the REGISTER message, and after verifying that the user information is legal through authentication, registers the user information in the database, and returns a success response message 200 OK to UE1.

Step 5: In order to keep the user UE1 online, UE1 needs to periodically send a registration message to the synchronization control server periodically after a certain period of time, such as 1 minute.

Steps 6-10: User Equipment 2 (UE2) also needs to periodically and cyclically send a REGISTER registration request to the synchronization control server, so that the synchronization control server can obtain the user information of UE2.

Step 11: UE1 sends an INVITE message to the synchronization control server.

The INVITE message sent in this step contains essential information of a data synchronization session (session), including the data type currently requested by UE1 for data synchronization and the synchronization protocol adopted.

Step 12: The synchronization control server returns a Trying (Trying) message to UE1, indicating that the synchronization control server has received the INVITE message sent by UE1 and is processing it.

Step 13: After the synchronization control server authenticates UE1 and confirms that the user UE1 has passed the authentication, it checks whether the via header field in the INVITE request message contains the address of the user UE1. If the via header field in the INVITE request message carries the address of UE1, the synchronization control server inserts its own address in the Via header field of the INVITE request message, and forwards the INVITE request to the called user equipment UE2 indicated by the To field of the INVITE message .

Step 14: UE2 returns a Trying message, indicating that UE2 has received the INVITE request sent by the synchronization control server.

Step 15: After receiving the INVITE message forwarded by the synchronization control server, UE2 first matches the data type and synchronization protocol required by UE1 for data synchronization, and encapsulates its own user information, such as IP address, port number, etc., into the desired In the 200 OK message sent, the 200 OK message is then sent to the synchronization control server, indicating that the INVITE request is successfully received and processed.

Step 16: After receiving the 200 OK message, the synchronization control server forwards the 200 OK message to UE1.

It can be seen that, after being forwarded by the synchronization control server, the information of UE2 is forwarded to UE1.

Step 17: After receiving the 200 OK message, UE1 obtains the data synchronization session control information with the terminal UE2, and finally sends an ACK confirmation message to the synchronization control server, indicating that the message is successfully received.

Step 18: The synchronization control server forwards the ACK message to UE2 to confirm that UE1 has received the 200 OK response message sent by UE2. At this time, UE1 and UE2 have established a SIP control connection and are ready to synchronize data with UE1 at any time.

Step 19: According to the obtained data synchronization session information, UE1 selects a synchronization protocol negotiated with UE2, such as syncML protocol or rSync protocol, for each type of data that needs to be synchronized, and performs data synchronization with UE2.

Step 20: UE1 sends BYE synchronization end information to the synchronization control server, indicating that it requests to end the current synchronization process.

Step 21: When the synchronization control server receives the BYE message sent by UE1, it sends back an end response message, indicating that the request is terminated.

Step 22: The synchronization control server sends a BYE request message to UE2, requesting to end the synchronization control process, and at the same time prepares to recycle the synchronization session information established in this synchronization process, and deletes the session information established in this synchronization process after receiving the 200 OK message from UE2. The established synchronous session information, so as to realize the recycling of the synchronous session information.

Step 23: UE2 ends the synchronous transmission, and returns a 200 OK message to the synchronous control server, indicating that the synchronous transmission process is successfully completed.

Fig. 4 is a schematic diagram of the composition of the data synchronization system provided by the present invention.

As shown in FIG. 4 , the system includes a synchronization control server 401 and multiple synchronization clients 402 .

The synchronization control server 401 is a network server for realizing data synchronization, specifically for receiving the synchronization service registration request of the synchronization client 402, and storing the user information carried in the synchronization service registration request, so as to establish and maintain the synchronization with the synchronization client 402. According to the user information stored by itself, the data synchronization session information is forwarded between the synchronization clients participating in the synchronization session, so as to realize the data synchronization session control between different synchronization clients 402, such as the establishment of the data synchronization session, Maintain and dismantle.

Wherein, the synchronization control server 401 establishes and maintains the IP online connection with the synchronization client 402 by storing and updating the IP address and port number of the synchronization client 402 .

The synchronization client 402 is a module in the user equipment, for example, can be installed in various devices such as mobile phones, PDAs, PCs, etc. The synchronization client 402 communicates with the synchronization control server 401 through a wireless network or the Internet.

The synchronization client 402 is specifically used to send a synchronization service registration request to the synchronization control server 401, thereby establishing and maintaining an IP online connection with the synchronization control server 401, and controlling data synchronization sessions with other synchronization clients 402 by the synchronization control server 401, Data transmission is directly performed with the other synchronization client 402 according to the data synchronization session information forwarded by the synchronization control server.

The synchronization client 402 establishes and maintains an IP online connection with the synchronization control server 401 by sending and updating its own IP address and port number to the synchronization control server 401 .

The synchronization client 402 controls data synchronization sessions with other synchronization clients 402 through the synchronization control server 401 , which may specifically include: the synchronization client 402 establishes, maintains, and dismantles data synchronization sessions with other synchronization clients 402 through the synchronization control server 401 .

The establishment of the data synchronization session through the synchronization control server 401 specifically includes: the synchronization client 402 participating in the data synchronization session obtains the synchronization session information of other synchronization clients 402 participating in the data synchronization session through the synchronization control server 401 . More specifically, the synchronization client 402 participating in the data synchronization session first forwards the local synchronization session information to other synchronization clients 402 through the synchronization control server 401, and after receiving the synchronization session information, the other synchronization clients 402 forward all the synchronization session information The data types that need data synchronization are matched with the synchronization protocol, and according to the matching result, the synchronization session information of itself is forwarded to the original synchronization client 402 by the synchronization control server 401 again, so that the original synchronization client 402 and other synchronization clients 402 have obtained the synchronous session information of the other party, and then the synchronous transmission can be performed. The synchronization session information includes: the IP address and port number of the other synchronization client 402, the type of data to be synchronized, the synchronization protocol adopted, and the like.

Maintaining the data synchronization session through the synchronization control server 401 specifically includes: the synchronization client 402 participating in the data synchronization session sends its updated synchronization session information to other synchronization clients 402 participating in the data synchronization session through the synchronization control server 401 .

Deleting the data synchronization session through the synchronization control server 401 is specifically: the synchronization control server 401 deletes the data synchronization session information in this data synchronization process.

The specific structures of the synchronization control server 401 and the synchronization client 402 are introduced below, please refer to FIG. 5 and FIG. 6 for details.

Fig. 5 is a structural diagram of the synchronization control server provided by the present invention.

As shown in FIG. 5 , the synchronization control server includes a synchronization service registration module 501 , a synchronization client always-on module 502 , and a synchronization session control module 503 .

The synchronization service registration module 501 is configured to receive a synchronization service registration request from a synchronization client, and store user information of the synchronization client.

The synchronization client always-on module 502 is configured to establish and maintain an IP online connection with the synchronization client.

The always-on module 502 of the synchronization client can specifically be used to receive the synchronization service registration request periodically sent by the synchronization client, or the synchronization service registration request sent when the user information of the synchronization client itself is updated, and send the synchronization service registration request to The synchronization service registration module 501 establishes and maintains an IP online connection with the synchronization client.

The synchronization session control module 503 is configured to implement data synchronization session control between synchronization clients, including establishment, maintenance and deletion of data synchronization sessions.

The synchronization session control module 503 is specifically configured to receive a synchronization session establishment request from a synchronization client, wherein the synchronization session establishment request carries data synchronization session information, and is queried according to the IP connection of the synchronization client maintained by the synchronization client always-on module 502 The synchronization client at the opposite end forwards the data synchronization session information between the synchronization clients, thereby establishing a data synchronization session between the synchronization clients.

Wherein, the synchronization service registration module 501 is configured to, after receiving the synchronization service registration request from the synchronization client, inquire whether the user information carried in the synchronization service registration request sent by the synchronization client this time has been stored, and if it has been stored, keep the The user information of the synchronization client remains unchanged, if not stored, the synchronization client is authenticated, and after the authentication is passed, the user information of the synchronization client is updated.

The synchronization session control module 503 is also configured to maintain a data synchronization session between synchronization clients.

The synchronization session control module 503 is specifically configured to update the data synchronization session information, and forward the updated data synchronization session information to the synchronization clients participating in the data synchronization session in real time.

The synchronization session control module 503 is further configured to receive a request from the synchronization client to end the data synchronization session, and delete the current data synchronization session information. Wherein, the synchronization client generally sends a request for ending the data synchronization session to the synchronization session control module 503 after the data synchronization is completed. Of course, it does not rule out that the synchronization client sends an end data synchronization session to the synchronization session control module 503 in other special cases. session request.

Wherein, the data synchronization session information is the context (context) information required to establish data synchronization, including but not limited to the following information: the IP address of the synchronization client, the port number of the synchronization session, the data type to be synchronized, and the synchronization method used. agreement etc.

Fig. 6 is a structural diagram of a synchronization client provided by the present invention.

As shown in FIG. 6 , the synchronization client includes a synchronization service registration module 601 , an always-on module 602 , a synchronization session control module 603 and a data synchronization module 604 .

The synchronization service registration module 601 is configured to send a synchronization service registration request to the synchronization server. The synchronization service registration request carries basic information of the synchronization client, for example, the IP address and port number of the synchronization client.

The always-on module 602 is configured to periodically or when the user information of the synchronization client itself is updated, send a synchronization service registration request to the synchronization control server, where the synchronization service registration request carries the user information of the synchronization client, so as to establish and Keep an IP online connection with the server.

After the always-on module 602 is used to implement the always-on of the user equipment where the always-on module 602 is located, data synchronization can be performed at any time between the always-on user equipment.

The synchronization session control module 603 is configured to communicate with the synchronization control server to complete the synchronization session control between user equipments, including establishment, maintenance and deletion of the synchronization session.

The synchronization session control module 603 is specifically configured to establish a data synchronization session with a synchronization session control module of another user equipment through the synchronization control server when the user equipment has data that needs to be synchronized.

Wherein, the synchronization service registration module 601 is used to receive the query information of the synchronization control server, which includes the token required for security authentication, encrypt the identification and password of the synchronization client according to the token, and then send it to the synchronization control server for authentication .

The establishment of the data synchronization session by the synchronization session control module 603 specifically includes: the synchronization session control module 603 exchanges context information required for data synchronization with other synchronization session control modules 603 participating in data synchronization. The context information specifically includes but is not limited to the following information: IP address of the user equipment, port number of the synchronization session, data type to be synchronized, synchronization protocol adopted, and the like.

The data synchronization module 604, according to the data synchronization session established by the synchronization session control module 603, directly performs data transmission with other data synchronization modules, that is, when performing data transmission, it does not need to go through the synchronization control server, but directly between the user equipment .

The data synchronization module 604 uses an agreed synchronization protocol (SyncML or rSync) to complete the synchronization of each type of data, specifically according to the context established by the synchronization session.

Wherein, the synchronous session context information described in the present invention can be described in xml, and a specific example is given below to illustrate:

It can be seen that the data synchronization solution provided by the present invention does not require a server for data transfer, can effectively reduce the load on the server, and improve synchronization efficiency.

With the present invention, the user equipment can select different protocols for data synchronization according to needs during data synchronization. This method supports multiple types of data synchronization. For example, it can be based on data storage characteristics, data presentation methods, synchronization trigger methods, etc. , using syncML protocol or rSync protocol to realize data synchronization.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (11)

1. A data synchronization method, characterized in that the method comprises: The synchronization control server receives the synchronization service registration request from the synchronization client, and stores the user information carried in the registration request; The synchronization control server forwards the data synchronization session information between the synchronization clients participating in the synchronization session according to the user information stored by itself; According to the data synchronization session information, directly perform data transmission between the synchronization clients participating in the synchronization session; Wherein, the forwarding of the data synchronization session information between the synchronization clients participating in the synchronization session includes: The user equipment exchanges data synchronization session information with another user equipment through the synchronization control server, thereby establishing a data synchronization session between the user equipments; Described user information comprises the IP address and the port number of the user equipment where the synchronization client is located; The data synchronization session information includes the IP address and port number of the user equipment where the synchronization client is located, the type of data to be synchronized and the data synchronization protocol adopted. 2. The method according to claim 1, wherein the synchronous control server receiving the synchronous registration service request of the synchronous client comprises: The synchronization control server receives the synchronization service registration request sent periodically by the synchronization client or when the user information is updated. 3. The method according to claim 1, wherein said storing the user information carried in the registration request comprises: The synchronization control server inquires whether the user information carried in the synchronization service registration request sent by the synchronization client has been stored. If yes, keep the user information of the synchronization client unchanged; otherwise, authenticate the synchronization client. After passing, update the user information of the synchronization client. 4. The method according to claim 2, wherein, according to the user information stored by the synchronization control server, forwarding the data synchronization session information between the synchronization clients participating in the synchronization session comprises: The synchronization control server receives the synchronization session establishment request of the first synchronization client, and the synchronization session establishment request carries the data synchronization session information of the first synchronization client; The synchronization control server queries the second synchronization client participating in the synchronization session according to the user information stored by itself, and forwards the data synchronization session information of the first synchronization client to the second synchronization client; The second synchronization client matches the data synchronization session information of the first synchronization client with the data synchronization session information supported by the second synchronization client, and forwards the matched data synchronization session information to the first synchronization client through the synchronization control server . 5. The method according to claim 1, characterized in that the method further comprises: When the data synchronization session needs to be updated or terminated, the synchronization client updates or deletes the data synchronization session information with another synchronization client through the synchronization control server. 6. A data synchronization system, characterized in that the system includes a synchronization control server and a synchronization client; The synchronization control server is configured to receive a synchronization service registration request from a synchronization client, store user information carried in the registration request, and forward data synchronization session information between synchronization clients participating in the synchronization session according to the user information stored by itself; The synchronization client is used to directly perform data transmission with other synchronization clients participating in the synchronization session according to the data synchronization session information; Wherein, the forwarding of the data synchronization session information between the synchronization clients participating in the synchronization session includes: The user equipment exchanges data synchronization session information with another user equipment through the synchronization control server, thereby establishing a data synchronization session between the user equipments; Described user information comprises the IP address and the port number of the user equipment where the synchronization client is located; The data synchronization session information includes the IP address and port number of the user equipment where the synchronization client is located, the type of data to be synchronized and the data synchronization protocol adopted. 7. A synchronous control server, characterized in that, the synchronous control server comprises a synchronous service registration module, a synchronous client always-on module and a synchronous session control module; The synchronization service registration module is used to receive a synchronization service registration request from a synchronization client, and store user information of the synchronization client; The always-on module of the synchronization client is used to receive the synchronization service registration request sent periodically by the synchronization client or when the user information of the synchronization client itself is updated, and send the synchronization service registration request to the synchronization service registration module; The synchronization session control module is configured to receive a synchronization session establishment request from a synchronization client, where the synchronization session establishment request carries data synchronization session information, and query the synchronization session according to the user information maintained by the synchronization client always-on module The synchronization client at the opposite end forwards the data synchronization session information between the synchronization clients participating in the synchronization session; Wherein, the forwarding of the data synchronization session information between the synchronization clients participating in the synchronization session includes: The user equipment exchanges data synchronization session information with another user equipment through the synchronization control server, thereby establishing a data synchronization session between the user equipments; Described user information comprises the IP address and the port number of the user equipment where the synchronization client is located; The data synchronization session information includes the IP address and port number of the user equipment where the synchronization client is located, the type of data to be synchronized and the data synchronization protocol adopted. 8. The synchronous control server according to claim 7, characterized in that, The synchronization service registration module is used to query whether the user information carried in the synchronization service registration request sent by the synchronization client has been stored after receiving the synchronization service registration request from the synchronization client, and if it has been stored, maintain the synchronization The user information of the client remains unchanged, if not stored, then the synchronization client is authenticated, and after the authentication is passed, the user information of the synchronization client is updated. 9. The synchronous control server according to claim 7, characterized in that, The synchronization session control module is further configured to forward the updated data synchronization session information to the synchronization clients participating in the data synchronization session in real time, receive a request from the synchronization client to end the data synchronization session, and delete the current data synchronization session information. 10. A synchronous client, characterized in that the synchronous client includes a synchronous service registration module, an always-on module, a synchronous session control module and a data synchronization module; The synchronization service registration module is configured to send a synchronization service registration request to the synchronization server, and the synchronization service registration request carries user information of the synchronization client; The always-on module is configured to periodically or when the user information of the synchronization client itself is updated, send a synchronization service registration request to the synchronization control server, the synchronization service registration request carrying the user information of the synchronization client; The synchronization session control module is used to exchange data synchronization session information with other synchronization clients participating in data synchronization through the synchronization control server when there is data that needs to be synchronized; The data synchronization module is used to directly perform data transmission with other synchronization clients according to the data synchronization session information; Wherein, the user information includes the IP address and the port number of the user equipment where the synchronization client is located; The data synchronization session information includes the IP address and port number of the user equipment where the synchronization client is located, the type of data to be synchronized and the data synchronization protocol adopted. 11. The synchronization client according to claim 10, characterized in that, The synchronization service registration module is used to receive the query information from the synchronization control server, which includes the token required for security authentication, encrypt the identification and password of the synchronization client according to the token, and send it to the synchronization control server for authentication.