WO2022156423A1 - Data transmission method and apparatus - Google Patents

Abstract

Disclosed are a data transmission method and apparatus, relating to the field of communications. The method comprises: after obtaining a first instruction, a control plane network element skipping the step of sending a deletion instruction to a first user plane network element, and sending a user table entry to a second user plane network element according to the first instruction, wherein the deletion instruction is used for instructing the first user plane network element to delete a user table entry on the first user plane network element. Compared with the fact that a user table entry stored by a first user plane network element is deleted when a second user plane network element is notified by a control plane network element to process a data packet of a user, in the method provided in the present application, a terminal device accesses an interface corresponding to a first user plane network element, and a data packet sent by a terminal to a server is received by the first user plane network element; and after a control plane network element sends a user table entry to a second user plane network element, a user table entry in the first user plane network element is not deleted, and the first user plane network element can send the data packet to the server according to the user table entry, thereby avoiding the loss of user-side traffic.

Description

A data transmission method and device

This application claims the priority of the Chinese patent application with the application number 202110082610.0 and the application title "A method and device for data transmission" submitted to the State Intellectual Property Office on January 21, 2021, the entire contents of which are incorporated herein by reference middle.

technical field

The present application relates to the field of communications, and in particular, to a data transmission method and device.

Background technique

In the process of a user using a terminal device to access the server through the network, a broadband network gateway (BNG) is used to complete functions such as user authentication, access control, and traffic scheduling. With the endless variety of Internet services, in order to improve the bandwidth of BNG and the ability to handle the number of user sessions, software defined network (SDN) technology and network function virtualization (NFV) technology can be used to convert BNG It is divided into control plane NEs and user plane NEs. Control plane NEs are used to implement BNG control functions, and user plane NEs are used to implement BNG encapsulation and data forwarding functions, thereby realizing the decoupling of control functions and forwarding functions. , and the decoupling of software and hardware, improving the flexibility and scalability of BNG deployment.

Usually, one control plane network element can manage multiple user plane network elements. If the priority of the user is changed, the control plane network element may adjust the first user plane network element that processes the user's data packet to the second user plane network element. However, the control plane network element notifies the second user plane network element to process the user's data packet, and when the mechanism for processing the user's data packet has not been fully established, the user entry stored in the first user plane network element is deleted, causing the first user Neither the plane network element nor the second user plane network element can process the user's data packets, and packet loss occurs. Therefore, how to avoid packet loss during data transmission is an urgent problem to be solved at present.

SUMMARY OF THE INVENTION

The present application provides a data transmission method and device, which solve the problem of packet loss during data transmission.

To achieve the above object, the application adopts the following technical solutions:

In a first aspect, the present application provides a data transmission method, which is applied to a communication network. The communication network includes a first user plane network element, a second user plane network element, and a control plane network element, and the control plane network elements are respectively connected to the first user. A plane network element and a second user plane network element, the method is executed by a control plane network element, and the method includes: after the control plane network element obtains the first instruction, skipping the step of sending a deletion instruction to the first user plane network element, and Send the user entry to the second user plane network element according to the first instruction. The above-mentioned first instruction is used to instruct the user entry of the terminal device to be switched from the first user plane network element to the second user plane network element; the above-mentioned deletion instruction is used to instruct the first user plane network element to delete the first user. User entry on the plane network element; the above user entry can be used for the user plane network element to verify the data packets sent by the terminal device to the server. Since both the first user plane network element and the second user plane network element maintain user entries, the terminal device has accessed the interface corresponding to the first user plane network element, but has not yet accessed the interface corresponding to the second user plane network element. In the interface state, both the data packets sent by the terminal device to the server and the data packets sent by the server to the terminal device can be forwarded by the first user plane network element, which avoids packet loss during data transmission.

In an example, the handover network element establishes a first tunnel with the first user plane network element through the first interface, and the terminal device accesses the interface corresponding to the first user plane network element, but has not yet connected to the second user The interface corresponding to the plane network element, the data packet sent by the terminal device to the server is sent by the terminal device to the first user plane network element through the first tunnel, and the first user plane network element is sent to the server according to the user entry. The data packet sent by the server to the terminal device is sent by the server to the first user plane network element according to the first user route, the first user plane network element is sent to the terminal device through the first tunnel, and the first user route is sent by the first user plane network element. Published by user plane NEs.

In a possible implementation manner, the above-mentioned communication network may further include a switching network element and a decision-making network element, the decision-making network element is respectively connected to the control plane network element and the switching network element, and the control plane network element sends the second instruction to the second network element according to the first instruction. After the user plane network element sends the user entry, the data transmission method may further include: the control plane network element notifies the decision network element to send a second instruction to the switching network element, where the second instruction instructs the switching network element to connect the terminal device to the second The interface corresponding to the user plane NE. For example, the control plane network element sends a response message of the first command to the decision-making network element, so that the decision-making network element sends a second command to the switching network element after receiving the response message, so that the switching network element sends the terminal according to the second command. The device accesses the interface corresponding to the second user plane network element, and the second instruction is determined according to the service level agreement and/or the load condition of the communication network. Since the second user plane network element maintains user entries, after the terminal device accesses the interface corresponding to the second user plane network element, the data packets sent by the terminal device to the server can be forwarded by the second user plane network element, avoiding the need for Data packets on the user side during data transmission are lost; data packets sent by the server to the terminal device can be forwarded by the first user plane network element, which avoids packet loss on the network side during data transmission.

In an example, the switching network element establishes a second tunnel with the second user plane network element through the second interface, the second user plane network element receives the user entry sent by the control plane network element, and the terminal device accesses the In the second interface, the data packet sent by the terminal device to the server is sent by the terminal device to the second user plane network element through the second tunnel, and the second user plane network element is sent to the server according to the user entry.

In another example, the second user plane network element receives the user entry, and the terminal device accesses the interface corresponding to the second user plane network element, but the second user plane network element has not advertised routes to the outside world, and the server sends The data packet sent by the terminal device is sent by the server to the first user plane network element according to the first user route, and the first user plane network element is sent to the terminal device through the first tunnel.

In another possible implementation manner, after the control plane network element notifies the decision network element to send the second instruction, the data transmission method may further include: the control plane network element sends a route announcement instruction to the second user plane network element. The route issuing instruction instructs the second user plane network element to issue a route to the terminal device. For example, the route issuing instruction may instruct the second user plane network element to issue a user route to the server, and the user route is used by the server to determine the server to the terminal device. Forwarding path for sent packets.

In an example, the second user plane network element receives the user entry sent by the control plane network element, the terminal device accesses the second interface, and the second user plane network element advertises the second user route to the server, and the terminal device accesses the second interface. The data packet sent by the device to the server is sent by the terminal device to the second user plane network element through the second tunnel, and the second user plane network element is sent to the server according to the user entry, and the data packet sent by the server to the terminal device is It is sent by the server to the second user plane network element, and the second user plane network element is sent to the terminal device through the second tunnel, thus completing the user plane network element switching in the data transmission process, and the switching of the user plane network element in the data transmission process is completed. During the process, data packet loss on the user side and the network side is avoided.

In another possible implementation manner, after the control plane network element notifies the decision network element to send the second instruction, the data transmission method may further include: the control plane network element sends a deletion instruction to the first user plane network element. After the first user plane network element receives the deletion instruction sent by the control plane network element, the first user plane network element deletes the stored user entry, which reduces the maintenance data required by the first user plane network element, which is beneficial to Reduce the load of the communication network and improve the data transmission efficiency of the communication network.

In a second aspect, the present application provides a data transmission method, which is applied to a communication network, where the communication network includes a first user plane network element, a second user plane network element, a control plane network element, a decision network element, and a handover network element. The plane network element is respectively connected to the decision network element, the first user plane network element and the second user plane network element, the decision network element is connected to the handover network element, the method is executed by the decision network element, and the method includes: the decision network element is based on the service level. The protocol and/or the load situation of the communication network generates the first instruction and sends it to the control plane network element; after the decision network element receives the response message of the first instruction, it generates the second instruction and sends it to the handover network element. The above-mentioned first instruction is used to instruct the control plane network element to switch the user entry of the terminal device from the first user plane network element to the second user plane network element, and the above response message indicates that the control plane network element has sent the user entry. To the second user plane network element, the above-mentioned second instruction is used to instruct the switching network element to connect the terminal device to the interface corresponding to the second user plane network element.

In a possible situation, the second user plane network element receives the user entry sent by the control plane network element, the terminal device does not access the interface corresponding to the second user plane network element, and the data packet sent by the terminal device to the server is The first user plane network element performs encapsulation and forwarding.

In another possible situation, the second user plane network element receives the user entry sent by the control plane network element, and the terminal device accesses the interface corresponding to the second user plane network element, and the data sent by the terminal device to the server The packets are encapsulated and forwarded by the second user plane network element, so that the data packets sent by the terminal device to the server will not be lost due to the switching of the user plane network element, thereby avoiding packet loss of user-side traffic.

In a possible implementation manner, the data transmission method may further include: the decision-making network element generates a third instruction and sends it to the switching network element after a preset timer expires, the third instruction instructing the switching network element to disconnect the terminal The connection between the device and the interface corresponding to the first user plane network element. For example, the preset timer may be a process or a timing component; the timeout period may be set to 10 seconds, 5 seconds, or the like.

In one example, the third instruction may be combined with the second instruction, for example, the combined second instruction instructs the switching network element to connect the communication device to the second interface, and when the timer expires (for example, 5 seconds, After 8 seconds, 10 seconds, etc.), the binding between the communication device and the first interface is deleted.

In a third aspect, the present application provides a communication data transmission method, which is applied to a communication network. The communication network includes a first user plane network element, a second user plane network element, a control plane network element, a decision network element, and a handover network element. The plane network element is respectively connected to the decision network element, the first user plane network element and the second user plane network element, the decision network element is connected to the handover network element, and the data transmission method includes: the decision network element is based on the service level agreement and/or the communication network element The load situation generates a first instruction and sends it to the control plane network element, where the first instruction can be used to instruct the control plane network element to switch the user entry of the terminal device from the first user plane network element to the second user plane network element; The control plane network element obtains the first instruction, skips the step of sending a deletion instruction to the first user plane network element, and sends a user entry to the second user plane network element according to the first instruction, and the deletion instruction is used to instruct the first user The plane network element deletes the user entry on the first user plane network element; after sending the user entry to the second user plane network element according to the first instruction, the control plane network element also sends a response message to the decision network element, the response message Indicates that the control plane network element has sent the user entry to the second user plane network element; after the decision network element receives the response message, the decision network element generates a second instruction and sends it to the handover network element. The second instruction is used for The switching network element is instructed to connect the terminal device to the interface corresponding to the second user plane network element; the switching network element connects the terminal device to the interface corresponding to the second user plane network element according to the second instruction.

In a possible implementation manner, after the control plane network element notifies the decision network element to send the second instruction, the data transmission method further includes: the control plane network element sends a route release instruction to the second user plane network element, and the route release instruction Indicates the route that the second user plane network element advertises to the terminal device.

In another possible implementation manner, after the control plane network element notifies the decision network element to send the second instruction, the data transmission method further includes: the control plane network element sends a deletion instruction to the first user plane network element.

In another possible implementation manner, the data transmission method further includes: the decision-making network element generates a third instruction and sends it to the switching network element after a preset timer expires, the third instruction instructing the switching network element to disconnect the terminal The connection between the device and the interface corresponding to the first user plane.

In a fourth aspect, the present application provides a communication network, the communication network includes a first user plane network element, a second user plane network element, a control plane network element, a decision network element, and a handover network element, and the control plane network elements are respectively connected to make decisions. The network element, the first user plane network element and the second user plane network element, and the decision network element are connected to the handover network element. The decision network element is used to generate the first instruction according to the service level agreement and/or the load situation of the communication network, and to send the first instruction to the control plane network element, where the first instruction is used to instruct the control plane network element to change the user table of the terminal device. The item is switched from the first user plane network element to the second user plane network element. The control plane network element is used to obtain the first instruction, skip the step of sending a deletion instruction to the first user plane network element, and send the user entry to the second user plane network element according to the first instruction, and the deletion instruction is used to instruct the first user plane network element. The user plane network element deletes the user entry on the first user plane network element; after sending the user entry to the second user plane network element according to the first instruction, the control plane network element is further configured to send a response message to the decision network element, The response message indicates that the control plane network element has sent the user entry to the second user plane network element. The decision network element is further configured to generate and send a second instruction to the switching network element after receiving the response message, where the second instruction is used to instruct the switching network element to connect the terminal device to the interface corresponding to the second user plane network element. The switching network element is used for connecting the terminal device to the interface corresponding to the second user plane network element according to the second instruction.

In a possible implementation manner, the control plane network element is further configured to send a route advertisement instruction to the second user plane network element, where the route advertisement instruction instructs the second user plane network element to publish a route to the terminal device.

In another possible implementation manner, the control plane network element is further configured to send a deletion instruction to the first user plane network element.

In another possible implementation manner, the decision-making network element is further configured to generate a third instruction, where the third instruction instructs the switching network element to disconnect the connection between the terminal device and the interface corresponding to the first user plane; the decision-making network element also uses After the preset timer times out, a third instruction is sent to the switching network element.

In a fifth aspect, the present application provides a communication device, and the beneficial effects can be found in the description of any aspect of the first aspect, which will not be repeated here. The communication device has the functionality to implement the behavior in the method instance of any one of the above-mentioned first aspects. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. In a possible design, the communication device is applied to a communication network, and the communication network includes a first user plane network element, a second user plane network element, and a control plane network element, and the control plane network elements are respectively connected to the first user plane network element. A user plane network element and the second user plane network element, the communication device is configured to execute the function of the control plane network element, and the communication device includes: a transceiver module and a processing module. The transceiver module is used to obtain a first instruction, where the first instruction is used to instruct the control plane network element to switch the user entry of the terminal device from the first user plane network element to the second user plane network element; the processing module is used to skip to the user plane network element. The first user plane network element sends a deletion instruction, and sends a user entry to the second user plane network element according to the first instruction, and the deletion instruction is used to instruct the first user plane network element to delete the first user plane network element. User table entry.

In a possible implementation manner, the communication network further includes a handover network element and a decision network element, and the decision network element is respectively connected to the control plane network element and the handover network element. The transceiver module is further configured to notify the decision network element to send a second instruction to the switching network element, where the second instruction instructs the switching network element to connect the terminal device to the interface corresponding to the second user plane network element.

In another possible implementation manner, the transceiver module is further configured to send a route advertisement instruction to the second user plane network element, where the route advertisement instruction instructs the second user plane network element to publish a route to the terminal device.

In another possible implementation manner, the transceiver module is further configured to send a deletion instruction to the first user plane network element.

In a sixth aspect, the present application provides a communication device, and the beneficial effects can be found in the description of any aspect of the second aspect, which will not be repeated here. The communication device has the functionality to implement the behavior in the method instance of any one of the above-mentioned second aspects. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. In a possible design, the communication device is applied to a communication network. The communication network includes a first user plane network element, a second user plane network element, a control plane network element, a decision network element and a handover network element. The control plane network elements are respectively Connecting the decision network element, the first user plane network element and the second user plane network element, the communication device is used to realize the functions of the above decision network element, and the communication device includes: a transceiver module and a processing module. The processing module is configured to generate a first instruction according to the service level agreement and/or the load condition of the communication network, the first instruction is used to instruct the control plane network element to switch the user entry of the terminal device from the first user plane network element to the second a user plane network element; the transceiver module is configured to send a first instruction to a control plane network element; the transceiver module is further configured to generate a second instruction after the transceiver module receives a response message for the first instruction, the response message representing the control plane network element The user entry has been sent to the second user plane network element, and the second instruction is used to instruct the switching network element to connect the terminal device to the interface corresponding to the second user plane network element; the transceiver module is also used to send the switching network element second order.

In a possible implementation manner, the processing module is further configured to generate a third instruction, where the third instruction instructs the switching network element to disconnect the connection between the terminal device and the interface corresponding to the first user plane network element; the transceiver module is further configured to After the preset timer times out, a third instruction is sent to the switching network element.

In a seventh aspect, the present application provides a network device, the network device includes: a processor and a memory, the memory is used for storing computer instructions, when the processor executes the instructions, so that the network device executes the first aspect and the first aspect. Any one possible implementation manner, or any one possible implementation manner of the second aspect and the second aspect, or any one possible implementation manner of the third aspect and the third aspect, the operation steps of the data transmission method.

In an eighth aspect, the present application provides a computer-readable storage medium, in which a computer program or instruction is stored, and when the computer program or instruction is executed by a network device, any one of the first aspect and the first aspect may be implemented. or any one of the possible implementations of the second aspect and the second aspect, or the operation steps of the data transmission method of the third aspect and any one of the possible implementations of the third aspect.

In a ninth aspect, the present application provides a computer program product that, when the computer program product runs on a computer, enables a computing device to perform any one of the possible implementations of the first aspect and the first aspect, or the second aspect and the second aspect Any one of the possible implementations, or the operation steps of the data transmission method of any one of the third aspect and any one of the possible implementations of the third aspect.

In a tenth aspect, the present application provides a chip, including a memory and a processor, the memory is used for storing computer instructions, and the processor is used for calling and running the computer instructions from the memory, so as to execute the above-mentioned first aspect and any possibility of the first aspect. The method in the implementation manner of the above, or any one of the possible implementation manners of the second aspect and the second aspect, or the operation steps of the data transmission method in any one of the third aspect and any possible implementation manner of the third aspect.

On the basis of the implementation manners provided by the above aspects, the present application may further combine to provide more implementation manners.

Description of drawings

1 is a schematic structural diagram of a communication network according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of another communication network provided by an embodiment of the present application;

3 is a schematic flowchart of a data transmission method provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of a user plane network element according to an embodiment of the present application;

FIG. 5 is a schematic flowchart of another data transmission method provided by an embodiment of the present application;

6 is a schematic flowchart of another data transmission method provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of an effect of data transmission provided by an embodiment of the present application;

FIG. 8 is a schematic flowchart of another data transmission method provided by an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a network device according to an embodiment of the application.

Detailed ways

The implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a communication network provided by an embodiment of the present application. The communication network includes at least one terminal (terminals 111 to 116 as shown in FIG. 1 ) and a server 130 . The terminal can access the server 130 through the network. The network may be an internet service provider (ISP) network. An ISP is an operator that provides Internet access services, information services and value-added services to a large number of users. The ISP network may include at least one network device (such as network device 122 and network device 123 as shown in FIG. 1 ).

A terminal (terminal) may also be called a terminal device, a user equipment (UE), a mobile station (mobile station, MS), a mobile terminal (mobile terminal, MT), and the like.

In some embodiments, the terminal may be a mobile phone (the terminal 111 and the terminal 116 as shown in FIG. 1 ), a tablet computer (the terminal 112 as shown in FIG. 1 ), a computer with a wireless transceiving function (as shown in FIG. 1 ) 1), personal communication service (PCS) phone (terminal 114 as shown in FIG. 1), desktop computer (terminal 115 as shown in FIG. 1), virtual Reality (Virtual Reality, VR) terminal equipment, Augmented Reality (AR) terminal equipment, wireless terminal in industrial control (industrial control), wireless terminal in unmanned driving (self driving), remote surgery (remote medical surgery) ), wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, etc. Wait.

In other embodiments, the terminal may also be a home gateway. The home gateway may be, for example, an optical network terminal (optical network terminal, ONT). Illustratively, the network device 121 as shown in FIG. 1 may be an optical network terminal. Optical network terminals can connect user equipment such as PCs and mobile phones to the Internet. The home gateway can transmit data of the following services: Internet access services (such as interactive network TV services, including home gateways supporting video on demand, live broadcast services, and distance education, etc.), online game services (for example, game terminals conduct game services through the home gateway), Internet Protocol (Internet Protocol, IP) telephony, video telephony and video surveillance services, etc. For another example, the home gateway can also implement home control and security service management on a remote network. For example, a user who owns a home gateway can access automated lighting, heating and security systems, etc. in the area covered by the home gateway during work or outing. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

The network device may be a routing and forwarding device, for example, the routing and forwarding device may be a router or a switch (the network device 123 shown in FIG. 1 ), which may be a core router (core router, CR), an edge router (provider edge, PE) )Wait. The network device may also be a BNG or a broadband remote access server (Broadband Remote Access Server, BRAS).

The terminal can use the network device to access the server. For example, in the room shown in FIG. 1 , the first user may use the terminal 111 to establish a communication connection with the network device 121 using the wireless-fidelity (WIFI) technology, so that the terminal 111 sends data packets to the server 130 . For another example, in the basketball court shown in FIG. 1 , the second user may also use the terminal 116 to establish a sampling mobile communication technology with a radio access network (RAN) (not shown in the figure). Communication connection, access server 130.

Server 130 may be an application server or an authentication and authorization server. The server 130 may provide video services, game services, message services, music services, authentication and authorization services, and the like. In one example, the functionality of multiple services may be integrated on server 130 , for example, game services and music services may be deployed on server 130 . In another example, the server 130 may also integrate the functions of some services, for example, some services of the game service and some services of the video service are deployed on the server 130 . The server 130 may also provide a plurality of virtual machines by using the virtualization technology, and the virtual machines provide various services. The embodiment of the present application does not limit the deployment form of the service.

The network device is connected with the server 130 in a wireless or wired manner. FIG. 1 is only a schematic diagram, and the communication network may also include other devices, which are not shown in FIG. 1 . The embodiments of the present application do not limit the number of terminal devices, network devices, and servers included in the communication network.

In order to improve the bandwidth of the BNG and the ability to handle the number of user sessions, the network equipment provided by the ISP can be virtualized using SDN and NFV technologies to obtain multiple virtualized network elements. FIG. 2 is a schematic structural diagram of another communication network provided by an embodiment of the present application. As shown in FIG. 2 , the communication network includes an access network element 210, a switching network element 220, and at least two user plane network elements (as shown in FIG. 2 ). The illustrated first user plane network element 231, second user plane network element 232 and third user plane network element 233), control plane network element 240, decision network element 250 and authentication network element 260.

The access network element 210 is used to implement a function provided by an access network (access network, AN) device, which can aggregate data packets of multiple terminals on an aggregation router provided by an ISP. In some examples, the AN device may be a wired device, eg, an ONT. In other examples, the AN device may be a wireless device, eg, a base station.

The switching network element 220 is used to implement the functions provided by the aggregation router. Virtualizing a physical port (interface) on the aggregation router can obtain multiple subinterfaces, which are used to establish communication tunnels with user plane network elements. The communication tunnel may be a virtual local area network (virtual local area network, VLAN) tunnel, a virtual extensible local area network (VXLAN) tunnel, or a virtual private network (virtual private network, VPN) tunnel, and the like. For example, there are three interfaces shown in FIG. 2 : a first interface 221 , a second interface 222 and a third interface 223 . The switching network element 220 establishes a communication tunnel with the user plane network element deployed on the BNG through these three interfaces. Specifically, the switching network element 220 establishes a first tunnel V1 to communicate with the first user plane network element 231 through the first interface 221 , and establishes a second tunnel V2 to communicate with the second user plane network element 232 through the second interface 222 . The third interface 223 establishes a third tunnel V3 for communication with the third user plane network element 233 .

In some embodiments, the first tunnel V1 can be used to transmit the data packets of the first user, the second tunnel V2 can be used to transmit the data packets of the second user, and the third tunnel V3 can be used as the data packets of the first user and the second user. Alternate communication tunnel. As shown in FIG. 1 , the first user may refer to all users accessing the network from the network device 121 , and the second user may refer to the user who uses the terminal 116 to access the network.

User plane network elements are used to implement data encapsulation and forwarding functions provided by BNG or virtual broadband network gateway (vBNG). Illustratively, the first user plane network element 231 shown in FIG. 2 may generate a user entry according to the network information sent by the control plane network element 240, and the user entry may include the IP information of the terminal 111 used by the first user, the network A media access control (media access control, MAC) address of the device 121, and the like.

In a possible design, there may be at least one routing and forwarding device between the network device where the user plane network element is deployed and the server. The user plane network element encapsulates and forwards the data packets, and there is a routing and forwarding device for re-forwarding to the server. .

In another possible design, there may be no routing forwarding device between the network device where the user plane network element is deployed and the server. For example, the network device deploying the user plane network element is connected to the server through a physical medium, and the network device deploying the user plane network element sends data to the server.

The control plane network element 240 is used to implement the control function provided by the BNG or the vBNG. Illustratively, control plane network elements can control the operation of various network protocols, such as open shortest path first (OSPF), address resolution protocol (ARP), spanning tree protocol (spanning tree protocol, STP) etc. In some examples, the control plane network element may also provide network information and user entries required by the user plane network element to encapsulate data and forward data.

For example, the user management functions on multiple broadband remote access servers (BRAS) are extracted, and the user management functions of multiple BRASs are centralized to obtain a control plane (CP); The forwarding function reserved on the BRAS is used as the user plane (UP).

In a first possible design, the UP can be a traditional hardware network device called the physical user plane (pUP).

In the second possible design, the CP and the UP can be virtual network elements. For example, the UP is deployed as a virtual network element on an X86 server, which can be called a virtual user plane (vUP); in another example, the CP runs On an X86 server, it can be called a virtual broadband network gateway control plane (vBNG-CP). One vBNG-CP can manage multiple pUPs and vUPs.

The CP can implement the functions of the above-mentioned control plane network elements, such as dialing protocol management, user plane management, user management, address management, and authentication management.

The UP can implement the functions of the above-mentioned user plane network elements, for example, access list control, routing management, label management, forwarding management, and quality of service (quality of service, QoS) management.

The decision-making network element 250 may include an SDN network element, and the SDN network element is used to implement the function provided by the SDN controller, which may implement the flow control function of the SDN. For the specific functions and implementation of the SDN controller, reference may be made to the description in the prior art, which will not be repeated in this application.

The decision-making network element 250 may further include a migration network element, and the migration network element is used to implement the function of a user-plane selection function (USF) component, which can receive the access line of the corresponding user sent by the control plane network element 240 information. For example, the access line information includes the identification (identity document, ID) of the access network device (eg, switch or optical line terminal) used by the user to access the network, the VLAN information where the terminal used by the user is located, and the access network device Logical interface information on the interface (eg, VLAN information of the interface), etc.

As an optional implementation manner, the control plane network element, the SDN network element, and the migration network element may be respectively set on different physical network devices, or may be set on the same physical network device. This application does not limit the specific deployment forms and deployment locations of the SDN network elements, the decision-making network elements, and the control plane network elements.

The authentication network element 260 is used to implement functions provided by an authentication server (radius server). For example, the authentication network element 260 can implement functions such as user dial-up verification and security authentication.

For example, as shown in FIG. 2, the first user sends a dial-up protocol packet to the access network element 210 through the terminal, and the switching network element 220 forwards it to the first user plane network element 231 through the first tunnel, and the first user plane network element 231. Element 231 sends the dial-up protocol message to the control plane network element 240, and the authentication network element 260 receives the dial-up protocol message forwarded by the control plane network element 240 and verifies it, confirms that the first user is a legitimate user, and allows the terminal device online.

FIG. 1 and FIG. 2 are only schematic diagrams provided by the embodiments of the present application, and the communication network may also include other terminals, network devices, and network elements, which are not shown in FIG. 1 and FIG. 2 . The embodiments of the present application do not limit the number of network devices, terminals, and network elements included in the communication network.

In the current technical solution, in order to realize the data transmission and migration of the communication device, when the communication device is connected to the first interface of the switching network element, that is, the communication device used by the first user accesses the server through the first tunnel, and the communication When the device has not switched from the first interface to the second interface, the user entry in the first user plane network element has been deleted, so that the first user plane network element cannot continue to use the user entry to verify the data from the communication device packet, the first user plane network element will not forward the data packet; and, because the terminal has not yet connected to the second interface, the second user plane network element cannot receive the data packet from the communication device, so the server cannot receive the data packet from the communication device. The data packets of the device, that is, the user-side traffic is lost.

The communication device described in this embodiment of the present application may be any one of the terminals 111 to 116 and the network device 121 shown in FIG. 1 .

In order to avoid traffic loss on the user side and at least solve the deficiencies proposed in the background art, an embodiment of the present application provides a data transmission method, the method is applied to a communication network, and the method includes: after the control plane network element obtains the first instruction, skipping to The first user plane network element sends a deletion instruction, and sends a user entry to the second user plane network element according to the first instruction, and the deletion instruction is used to instruct the first user plane network element to delete the first user plane network element. User table entry. The first instruction is used to instruct the control plane network element to switch the user entry of the terminal device from the first user plane network element to the second user plane network element, and the deletion instruction is used to instruct the first user plane network element to delete the first user User entry on the plane network element, the user entry is used to verify the data packet sent by the communication device to the server.

In the data transmission method provided by this embodiment of the present application, since the first user plane network element maintains user entries, in the state that the communication device is connected to the first interface, the data packet sent by the communication device to the server is sent by the communication device through the first interface. The tunnel is sent to the first user plane network element, and the first user plane network element sends the data packet to the server according to the user entry; the data packet sent by the server to the communication device is sent by the server according to the first user route. The first user plane network element is sent to the communication device through the first tunnel by the first user plane network element, and the first user route is advertised by the first user plane network element. That is to say, when the communication device is connected to the first interface, the first user plane network element can receive data packets sent by the communication device through the first tunnel; and the control plane network element sends the user entry to the second user plane. After the network element is installed, the user table entry maintained by the first user plane network element has not been deleted, and the first user plane network element can send the data packet to the server according to the user table entry, thereby avoiding user-side traffic loss.

Next, as shown in FIG. 3 , FIG. 3 is a schematic flowchart of a data transmission method provided by an embodiment of the present application. Here, the network elements included in the communication network shown in FIG. 2 are used as an example for description. Assuming that the communication device is connected to the first interface of the switching network element, and the first user uses the communication device to access the network through the first tunnel, the data transmission method provided by the embodiment of the present application includes the following steps.

S301. The communication device sends a user dialing protocol message to a control plane network element.

In some embodiments, the user dialing protocol message may be a protocol message that implements user authentication based on an extension option header (extension option header) of the Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol, DHCP), that is, an IPoE message.

In other embodiments, the user dialing protocol message may also be a point-to-point protocol over ethernet (point-to-point protocol over ethernet, PPPoE) message.

It can be understood that the data packet or data packet sent by the communication device to the server may be forwarded by the access network element. For example, the access network element can be deployed on the ONT, the communication device can be a desktop computer, and the data packets sent by the desktop computer are sent to the server through the ONT and other network devices. Although the access network element 210 shown in FIG. 2 is not shown in FIG. 3, those skilled in the art should know that the data packets or data packets sent by the communication device to the server can be forwarded by the access network element of.

In a possible situation, the user dialing protocol packet sent by the communication device to the control plane network element may be sent by the communication device to the access network element, and the access network element sends the message to the first user plane network element through the first tunnel. The user dialing protocol message is sent, and then sent by the first user plane network element to the control plane network element.

S302, the network element of the control plane parses the user dialing protocol packet to obtain the user account.

For example, the user account may be a user name, a user identification (identity document, ID), and the like. Exemplarily, the user account indicates that the user who uses the communication device is the first user.

S303. The control plane network element sends the user account to the authentication network element.

The authentication network element maintains a service-level agreement (SLA) mapping relationship of each user account. The SLA mapping relationship represents the correspondence between user accounts and their corresponding SLA information. SLA information can include the minimum bandwidth allocated to users, user bandwidth limits, the number of users that a single server can serve simultaneously, dial-in access availability, and user traffic priorities.

S304. The authentication network element sends the SLA information associated with the user account to the control plane network element.

For example, the authentication network element may look up the SLA information corresponding to the user account in the SLA mapping relationship, and send the SLA information to the control plane network element. Exemplarily, the SLA information includes the traffic priority of the first user, and the traffic priority indicates the priority of data packet forwarding between the communication device used by the first user and the accessed server (the server 130 shown in FIG. 1 ). class.

S305. The control plane network element forwards the SLA information to the decision network element.

S306. The decision network element sends a first instruction to the control plane network element.

The first instruction indicates a target user plane network element that forwards the data packet between the communication device and the server. In this embodiment, it is assumed that the first instruction indicates that the target user plane network element is the second user plane network element.

In the first possible design, the decision-making network element maintains the corresponding relationship between the SLA information and the level of the user plane network element. The decision network element generates the first instruction according to the SLA information received from the control plane network element and the control plane network element. Exemplarily, as shown in FIG. 4 , the transmission level of the first user plane network element is the first level, and the transmission levels of the second user plane network element and the third user plane network element are the second level. For example, the transmission level may be determined by the payment information of the first user, and the payment information may be the payment amount paid by the first user to the ISP during the billing cycle. After the billing cycle of the ISP is updated, the payment information indicates that the first user The amount paid by the user in the new billing cycle increases, the authentication network element updates the SLA information of the first user, and the decision network element determines that the user plane network element corresponding to the communication device used by the first user after the update is updated to the second level, The first instruction indicates that the target user plane network element of the first user may be any user plane network element in the second level, such as the second user plane network element and the third user plane network element as shown in FIG. 4 . For another example, the payment information indicates that the payment amount of the first user in the new charging period is reduced, and the decision-making network element is updated to a user plane network element with a lower level than the first level.

In the second possible design, the decision network element also maintains the load information of each user plane network element in the communication network, and the load information can be used by the decision network element to determine whether the user plane network element is in an overloaded state and the user plane Delay information of network elements, etc. The decision-making network element generates the first instruction according to the load condition of the communication network. For example, the load information may include information such as the maximum transmission bandwidth, occupied bandwidth, and remaining bandwidth of the user plane network element. As shown in FIG. 4 , the maximum transmission bandwidth of the first user plane network element is 50 megabits, and the occupied bandwidth is 30 megabits. bit, the remaining bandwidth is 20 megabits; the maximum transmission bandwidth of the second user plane network element is 100 megabits, the occupied bandwidth is 10 megabits, and the remaining bandwidth is 90 megabits; and the maximum transmission bandwidth of the third user plane network element is 100 megabits, the occupied bandwidth is 70 megabits, and the remaining bandwidth is 30 megabits. Assuming that the bandwidth required by the communication device is 30 megabits, in an embodiment, if the principle of "assignment on demand" is used, the first instruction indicates that the target user plane network element of the first user is the third user plane network element; In another embodiment, using the principle of "optimal performance", the first instruction indicates that the target user plane network element of the first user is the second user plane network element.

In a third possible design, the first instruction is generated by the decision-making network element according to the SLA information of the first user and the load situation of the communication network. For example, after the billing cycle of the ISP is updated, the target user plane network element of the first user is adjusted to the user plane network element of the second level. Due to the remaining bandwidth of the second user plane network element in the user plane network element of the second level If the value is larger, the first instruction indicates that the target user plane network element of the first user is the second user plane network element.

The above examples are only possible implementations provided by the present application, and do not represent limitations to the present application. For example, when a communication device generates a data packet, the decision-making network element may also determine the user plane network element of the communication device to transmit the data packet according to the current time.

S307. The control plane network element sends the user entry to the second user plane network element according to the first instruction.

The user entry includes user information of the user, for example, the user information may be the IP information and MAC address of the communication device used by the first user.

The user table entry can be used to verify the data packets sent by the communication device to the server. For example, the second user plane network element verifies whether the data packet from the communication device is a data packet sent by a legitimate user according to the user entry. If the data packet from the communication device is a legal data packet, the second user plane network element encapsulates and Forward the packet.

The user entry may be generated by the control plane network element according to the user information of the legitimate user maintained by the network element. For example, the user information of the legal user is maintained in the control plane network element. If the control plane network element receives the first instruction sent by the decision network element, and the control plane network element confirms that the first user using the communication device is a legal user, the control plane network element will control the The plane network element sends the user entry to the second user plane network element, and the second user plane network element can verify whether the data packet from the communication device is legal according to the user entry.

Please continue to refer to FIG. 3, under the first condition, that is, the second user plane network element receives the user entry sent by the control plane network element, the communication device is connected to the first interface, but the communication device is not connected to the second interface. In the state, the data transmission method provided by the embodiment of the present application further includes the following steps.

S308. The communication device sends the first data packet to the switching network element.

Herein, the first data packet refers to a data packet sent by the communication device to the server.

S309. The switching network element sends the first data packet to the first user plane network element through the first tunnel.

Because under the first condition, the first user plane network element also maintains the user entry of the first user, the switching network element can send the first data packet to the first user plane network element through the first tunnel, so that the first user plane network element The network element may verify the first data packet according to the user entry, and encapsulate and forward the first data packet after the verification is successful.

S310. The first user plane network element sends a first data packet to the server.

Therefore, when the second user plane network element receives the user entry sent by the control plane network element, and the communication device accesses the first interface but not the second interface, the first user plane network element maintains the first interface. A user entry of a user, the first user plane network element can use the first tunnel to continue to receive the first data packet (user side traffic) from the communication device, and the first user plane network element can also determine the first data packet according to the user entry. When a data packet is a data packet sent by a legitimate user, the first user plane network element is sent to the server to avoid packet loss on the user side during data transmission.

In a possible situation, after receiving the user entry, the second user plane network element may also send a response message to the control plane network element, so that the control plane network element notifies the decision network element after receiving the response message The interface switching process is started, and the response message indicates that the control plane network element has sent the user entry to the second user plane network element.

In the current technical solution, although the second user plane network element stores the user entry of the first user sent by the control plane network element, the second user plane network element has not advertised the user route to the server, so that the server sends the communication device to the communication device. When sending data packets (network-side traffic), it is still sent to the first user plane network element, but the communication device has been disconnected from the first interface corresponding to the first tunnel, so that the data packets sent by the server to the first user plane network element cannot be It is transmitted to the communication device, resulting in packet loss on the network side.

In the data transmission method provided by the embodiment of the present application, after the second user plane network element receives the user entry sent by the control plane network element, the communication device is further connected to the first interface, as shown in FIG. 3 , the embodiment of the present application The provided data transmission method may further include the following steps.

S311. The first user plane network element receives the second data packet sent by the server.

Herein, the second data packet refers to a data packet sent by the server to the communication device.

S312: The first user plane network element sends a second data packet to the switching network element.

The second data packet is sent by the first user plane network element to the switching network element through the first tunnel.

S313. The switching network element forwards the second data packet to the communication device.

Because the first user plane network element also maintains the user entry of the first user, the server maintains the first user route advertised by the first user plane network element, and the switching network element has not yet deleted the binding between the communication device and the first interface. The second data packet sent by the server to the communication device is still encapsulated and forwarded to the switching network element by the first user plane network element, and the second data packet sent by the server is sent by the switching network element to the communication device, avoiding the need for the server to The loss of the second data packet sent to the communication device, that is, the loss of the network-side traffic during the data transmission process is avoided.

In order to realize the data packets forwarded by the second user plane network element, this embodiment of the present application provides a possible example. As shown in FIG. 5 , the second user plane network element receives the user entry sent by the control plane network element. After that, in a state where the communication device is connected to the first interface but not connected to the second interface, the data transmission method provided by the embodiment of the present application further includes the following steps.

S314. The decision network element sends a second instruction to the switching network element.

The decision-making network element generates the second instruction according to the service level agreement of the first user and/or the load condition of the communication network. For example, the second instruction may be generated according to the service level agreement and the load situation of the communication network after the control plane network element receives the response message sent by the decision network element.

The second instruction is an interface switching instruction corresponding to the first instruction. For example, if the first instruction indicates that the target user plane network element of the first user is the second user plane network element, the second instruction instructs the communication device to access the second interface corresponding to the second tunnel.

For another example, if the first instruction indicates that the target user plane network element of the first user is the third user plane network element, the second instruction instructs the communication device to access the third interface corresponding to the third tunnel.

In an example, the decision-making network element also maintains interface information corresponding to each user plane network element, and the interface information includes the physical port where the interface is located and the address information of the interface. For example, it is assumed that the above-mentioned interfaces belong to the same physical port ( For example, the LAN port of the router), the interface and its corresponding address information are shown in Table 1 below.

Table 1

User plane NE serial number	Interface serial number	Address information
The first user plane network element	first interface	192.168.1.0/24
Second User Plane NE	second interface	192.168.2.0/24
third user plane network element	third interface	192.168.3.0/24

This embodiment of the present application is described by taking the second instruction instructing the communication device to access the second interface corresponding to the second tunnel as an example, but in another example, the second instruction may also instruct the switching network element to connect the communication device to the second interface. After a certain time (for example, 5 seconds, 8 seconds, 10 seconds, etc.) of the interface, the binding of the communication device to the first interface is deleted.

S315. The switching network element connects the communication device to the second interface according to the second instruction.

For example, after receiving the second instruction, the switching network element determines that the address information of the second interface is "192.168.2.0/24" according to the second instruction, and binds the interface of the first user (for example, the VLAN port of the communication device) information at that address.

When the second user plane network element receives the user entry sent by the control plane network element, and the communication device is connected to the second interface, as shown in FIG. 5 , after the above S315, the embodiment of the present application provides The data transmission method further includes the following steps.

S316. The communication device sends the first data packet to the switching network element.

S317. The switching network element sends the first data packet to the second user plane network element through the second tunnel.

The second user plane network element may verify the first data packet according to the user entry, and encapsulate and forward the first data packet after the verification is successful.

S318. The second user plane network element sends the first data packet to the server.

When the communication device is not connected to the second interface, the first data packet sent by the communication device is encapsulated and forwarded by the first user plane network element; when the communication device is connected to the second interface, the first data packet sent by the communication device is The first data packet is encapsulated and forwarded by the second user plane network element, so that the first data packet sent by the communication device to the server will not be lost due to switching of the user plane network element, thereby avoiding user-side traffic packet loss. Since the second user plane NE does not advertise the user route to the server, the second data packet sent by the server to the communication device is still forwarded by the first user plane NE to avoid packet loss on the network side. For the specific process, please refer to the above S311~ The related description of S313 will not be repeated here.

In the data transmission process, in order to switch the user plane network element forwarding the second data packet to the second user plane network element, the control plane network element can control the second user plane network element to publish the user route to the server, so that the user plane network element can be used in the user plane network element. During the switching process of the element, to avoid packet loss on the network side, the server shown in FIG. 5 communicates with the user plane network element through the forwarding device as an example for illustration. As shown in FIG. 6 , after the above-mentioned S318, the data transmission method provided by the embodiment of the present application further includes the following steps.

S319. The control plane network element sends a route advertisement instruction to the second user plane network element.

The route issuing instruction may be issued after the control plane network element interacts with the decision-making network element and confirms that the communication device is connected to the second interface. Exemplarily, after the switching network element connects the communication device to the second interface, the switching network element may send a response message (the response information indicates that the communication device has accessed the second interface) to the decision-making network element, so that the decision-making network element receives the second interface. After receiving the response information, it interacts with the network element of the control plane, and the network element of the control plane sends a route advertisement instruction.

The route advertisement instruction instructs the second user plane network element to publish the route to the terminal device. For example, the route publishing instruction may instruct the second user plane network element to publish the user route to the forwarding device, where the user route is used by the server to determine the forwarding path of the second data packet.

S320. The second user plane network element publishes the second user route to the forwarding device according to the route publishing instruction.

The second user route instructs the server to determine the forwarding path of the second data packet. For example, the second user route instructs the server to send the second data packet to the second user plane network element.

The forwarding device may be a device with a routing and forwarding function, such as a router, a switch, a server, and the like.

S321. The server sends the second data packet to the second user plane network element according to the second user route.

For example, when the second user route indicates that the second data packet is encapsulated and forwarded by the second user plane network element, the server sends the second data packet to the forwarding device according to the user route, and the forwarding device sends the second data packet to the forwarding device. Forwarded to the second user plane network element.

S322. The second user plane network element forwards the second data packet to the switching network element through the second tunnel.

Exemplarily, since the switching network element establishes a second tunnel with the second user plane network element through the second interface, and the second data packet includes the address information of the communication device used by the first user, the second user plane network element The second data packet may be sent to the switching network element through the second tunnel according to the address information.

S323. The switching network element forwards the second data packet to the communication device.

Because the communication device is connected to the second interface, after receiving the second data packet through the second tunnel, the switching network element can send the second data packet to the communication device according to the address information in the second data packet.

In the traditional technical solution, when the switching network element switches the communication device from the first interface to the second interface, and the second user plane network element receives the user entry sent by the control plane network element, the second user plane network element The element may not have sent a new user route (second user route), the server still sends the second data packet according to the original user route (first user route), and the first user route indicates that the second data packet is sent by the first user plane. The network element performs encapsulation and forwarding, but the switching network element has deleted the binding between the communication device and the first interface, so that the first user plane network element cannot send the second data packet to the communication device, resulting in packet loss on the network side.

In contrast, in the data transmission method provided by the embodiment of the present application, since the communication device is in the state of accessing the second interface, the switching network element has not yet deleted the binding between the communication device and the first interface, and the first user plane network element The second data packet sent by the server according to the route of the first user can continue to be received, and the first user plane network element can also send the second data packet to the communication device according to the destination address in the second data packet; the control plane network element also sends the second data packet to the first user. The second user plane network element sends a route advertisement instruction to the second user plane network element, so that after the second user plane network element publishes the second user route to the forwarding device, the forwarding network element of the second data packet is sent from the first user plane network element Switching to the second user plane NE avoids packet loss on the network side.

In the state where the second data packet is switched to the second user plane network element for forwarding, the first data packet sent by the communication device to the server is forwarded by the second user plane network element. For the specific process, please refer to the above S316-S318 related Explanation will not be repeated.

In order to reduce the load of the communication network, as shown in Figure 6, when the switching network element connects the communication device to the second interface, the second user plane network element advertises the second user route to the server, and the routing table of the forwarding device converges. In the state, as shown in FIG. 5 , the data transmission method provided by the embodiment of the present application further includes the following steps.

S324. The control plane network element sends a deletion instruction to the first user plane network element.

The deletion instruction is used to instruct the first user plane network element to delete the user entry on the first user plane network element.

Routing table convergence refers to the process that after the topology of the communication network changes, the routing table is re-established, sent, learned, and stabilized, and all related devices in the communication network are notified of the change. The behavior of recomputing routes to discover alternative routes.

In the data transmission method provided in the embodiment of the present application, after the routing table of the forwarding device converges to the switching of the forwarding network element of the second data packet from the first user plane network element to the second user plane network element, the forwarding device re-establishes the server Behavior of the data transmission path with the second user plane network element.

S325: The first user plane network element deletes the user entry stored in the first user plane network element according to the deletion instruction.

The first user plane network element deletes the stored user entry, which reduces the maintenance data required by the first user plane network element, which is beneficial to reduce the load of the communication network and improve the data transmission efficiency of the communication network.

In order to prevent the communication device from receiving invalid data sent by other devices, such as data packets with viruses, please continue to refer to FIG. 6 , the data transmission method provided by the embodiment of the present application further includes the following steps.

S326. The decision network element generates a third instruction.

The third instruction instructs the switching network element to disconnect the communication device from the interface corresponding to the first user plane network element.

The third instruction is determined according to the service level agreement of the first user and/or the load condition of the communication network, and is an interface switching instruction corresponding to the first instruction. For example, when the communication device is connected to the first user plane network element, if the first instruction indicates that the target user plane network element of the first user is the second user plane network element, the third instruction instructs the communication device to disconnect the first user plane network element. The first interface corresponding to the tunnel.

S327: The decision network element sends a third instruction to the switching network element after the preset timer expires.

The above-mentioned timer may start timing at the time when the decision-making network element sends the second instruction to the switching network element, for example, 5 seconds, 10 seconds, etc., after reaching the preset time, the decision-making network element sends the third instruction to the switching network element. .

As a possible implementation manner, the decision-making network element includes a migration network element and an SDN network element. For the above S326 and S327, it may include: the migration network element is based on the service level agreement of the first user and/or the load of the communication network In the case of generating a third instruction, the migration network element sends the third instruction to the SDN network element after the preset timer expires, and the SDN network element sends the third instruction to the switching network element.

S328. The switching network element disconnects the communication device from the first interface according to the third instruction.

Both the second command and the third command are interface switching commands corresponding to the first command. In the above-mentioned embodiments provided in this application, the second command is used as the interface access command, and the third command is used as the interface disconnection command for description and elaboration. , in another example, the third instruction can be combined with the second instruction, for example, the combined second instruction instructs the switching network element to connect the communication device to the second interface, and within a certain time (for example, 5 seconds, After 8 seconds, 10 seconds, etc.), the binding between the communication device and the first interface is deleted.

In order to avoid packet loss on the network side, the embodiment of the present application also provides another possible implementation manner, that is, the communication device is connected to all interfaces of the switching network element, and a verification-free process is set for the communication device, and the verification-free process indicates The communication device does not verify the data packets from any user plane network element, then the second data packet sent by the server can be forwarded by any user plane network element in the communication network, and the communication device can receive any user plane network element. The data packets sent by the network element also avoid packet loss on the network side during the data transmission process.

In order to facilitate the understanding of the data transmission method provided by the above-mentioned embodiments of the present application, on the basis of the communication network provided in FIG. 2, a schematic diagram of data transmission is provided, as shown in FIG. The transmission path of the data packet (the first data packet), the dashed arrow represents the transmission path of the data packet (the second data packet) sent by the server to the communication device, and the data transmission process of this application includes various states.

The first state, that is, the second user plane network element receives the user entry sent by the control plane network element, and the communication device is connected to the first interface but not connected to the second interface, as shown in Figure 7 As shown in (a), both the first data packet and the second data packet are forwarded via the first user plane network element. For the specific process, please refer to the relevant descriptions of S308 to S313 above, which will not be repeated here.

The second state, that is, the second user plane network element receives the user entry sent by the control plane network element, the communication device is connected to the second interface, and the second user plane network element has not yet advertised the second user route. As shown in (b) in Figure 7, the first data packet is forwarded via the second user plane network element. For the specific process, please refer to the relevant explanations in the above S314 to S318; the second data packet is transmitted through the first user plane network element. For the specific process, please refer to the relevant descriptions of the above S311-S313.

The third state, that is, the second user plane network element receives the user entry sent by the control plane network element, the communication device accesses the second interface, and the second user plane network element advertises the second user route to the outside world state, as shown in (c) in FIG. 7 , both the first data packet and the second data packet are forwarded via the second user plane network element. For the specific process, please refer to the relevant descriptions of the above S316-S318 and S321-S323, which will not be repeated here.

Using the data transmission method provided by the embodiment of the present application, during the data transmission process, no matter in any of the above-mentioned first state to third state, the first data packet and the second data packet have a user plane network. Element forwarding, avoiding user-side traffic packet loss and network-side traffic packet loss.

The above embodiment is only a possible specific implementation manner provided by the present application, and does not represent a limitation to the present application. Here, the control plane network element, the first user plane network element and the second user plane network element shown in FIG. 2 are used. For example, as shown in FIG. 8 , FIG. 8 is a schematic flowchart of another data transmission method provided by an embodiment of the present application, and the data transmission method may include the following steps.

S810. The control plane network element obtains the first instruction.

In a possible situation, the first instruction is determined according to the service level agreement of the first user and/or the load of the communication network, and the user entry is used to verify the data packet sent by the terminal device to the server. For the relevant content of the first command and the user entry, please refer to the relevant descriptions of the above S306 to S307, which will not be repeated.

In another possible situation, the first instruction may also be generated by the control plane network element in order to maintain the first user plane network element. For example, the control plane network element determines that the working time of the first user plane network element is relatively long. , the first instruction is generated, and the user entry is sent to the second user plane network element, so as to switch the user plane that forwards the data packets between the terminal device and the server to the second user plane network element.

As an optional implementation manner, the first instruction may also be issued by the operator according to the management requirement of the ISP network, for example, the management requirement may be to shut down the network device on which the first user plane network element is deployed.

After the above S810, the control plane network element skips the step of sending a deletion instruction to the first user plane network element, and executes S820.

S820. The control plane network element sends the user entry to the second user plane network element according to the first instruction.

The above deletion instruction is used to instruct the first user plane network element to delete the user entry on the first user plane network element.

In the first possible situation, the meaning of "the control plane network element skips sending the deletion instruction to the first user plane network element" can be understood as the control plane network element does not send the first user a message when the communication network is in the first state The plane network element sends a delete command. For example, the first state may be that the control plane network element sends the user entry to the second user plane network element, but the terminal device does not access the interface corresponding to the second user plane network element.

In the second possible situation, the meaning of "the control plane network element skips sending the deletion instruction to the first user plane network element" can also be understood as that the control plane network element switches from the first state to the second state in the communication network Then, the control plane network element sends a deletion instruction to the first user plane network element. For example, the second state may be that the control plane network element sends the user entry to the second user plane network element, and confirms that the terminal device has accessed the interface corresponding to the second user plane. For another example, the second state may also be that the control plane network element confirms that the data packet sent by the terminal device to the server is forwarded by the second user plane network element, and the second user plane network element advertises routes to the outside. For another example, the communication between the server and the user plane network element through the forwarding device is used as an example for description. The second state may also be that the control plane network element confirms that the data packet sent by the terminal device to the server is forwarded by the second user plane network element. The second user plane network element advertises routes to the outside, and the routing table of the forwarding device converges. For the content of the routing table convergence, please refer to the relevant description of the above S324, which will not be repeated.

In the third possible situation, the meaning of "the control plane network element skips sending the deletion instruction to the first user plane network element" can also be understood as that the control plane network element does not send the third A user plane network element sends a delete instruction.

In the data transmission method provided by the embodiment of the present application, in the state that the communication device is connected to the interface corresponding to the first user plane network element, the first user plane network element can receive the data packet sent by the communication device; and the control plane network element sends the data packet. When the user entry is in the state of the second user plane network element, the deletion of the user entry maintained by the first user plane network element is skipped, so that the first user plane network element can send the data packet to the server according to the user entry. The traffic loss on the user side is avoided.

In addition, since the server maintains the first user route advertised by the first user plane network element, and the communication device also accesses the interface corresponding to the first user plane network element, the server sends the second data to the communication device according to the first user route The packet is still encapsulated and forwarded by the first user plane network element. After the switching network element receives the second data packet forwarded by the first user plane network element, the switching network element sends the second data packet to the communication device, avoiding network Packet loss of side traffic.

It can be understood that, in order to implement the functions in the foregoing embodiments, the network device includes corresponding hardware structures and/or software modules for performing each function. Those skilled in the art should easily realize that the units and method steps of each example described in conjunction with the embodiments disclosed in the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software-driven hardware depends on the specific application scenarios and design constraints of the technical solution.

FIG. 9 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application. These communication apparatuses can be used to implement the functions of the network device or each network element in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In the embodiment of the present application, the communication device 900 may be any one of the network devices 121 to 123 shown in FIG. 1 , the server 130 , or a module (such as a chip) applied to the network device. ).

As shown in FIG. 9 , the communication apparatus 900 includes a processing module 910 and a transceiver module 920 . The communication apparatus 900 is configured to implement the functions of each network element in the method embodiment shown in FIG. 3 , FIG. 5 , FIG. 6 or FIG. 8 .

When the communication device 900 is used to implement the function of the control plane network element in the method embodiment shown in FIG. 3 : the transceiver module 920 is used to execute the above S303, S305 and S307; the processing module 910 is used to execute the above S302.

When the communication apparatus 900 is used to implement the function of the decision-making network element in the method embodiment shown in FIG. 3 , the transceiver module 920 is used to execute the above-mentioned S306.

The above steps are also performed in FIG. 5 and FIG. 6 , which will not be repeated in the following.

When the communication apparatus 900 is used to implement the function of the control plane network element in the method embodiment shown in FIG. 5 , the transceiver module 920 is further configured to perform the above-mentioned S314.

When the communication apparatus 900 is used to implement the function of the network element of the control plane in the method embodiment shown in FIG. 6 : the transceiver module 920 is used to execute the above-mentioned S319 and S324.

When the communication apparatus 900 is used to implement the function of the decision-making network element in the method embodiment shown in FIG. 6 , the processing module 910 is further configured to perform the above S326, and the transceiver module 920 is further configured to perform the above S327.

When the communication apparatus 900 is used to implement the function of the control plane network element in the method embodiment shown in FIG. 8 , the processing module 910 is further configured to execute the above S810, and the transceiver module 920 is configured to execute the above S820.

More detailed descriptions of the above processing module 910 and the transceiver module 920 can be obtained directly by referring to the relevant descriptions in the method embodiments shown in FIG. 3 , FIG. 5 , FIG. 6 or FIG. 8 , and details are not repeated here.

In some cases, the communication apparatus 900 may also implement the functions of the switching network element, the first user plane network element, the second user plane network element, the communication device, the forwarding device, and the server. 5. Relevant descriptions in the method embodiment shown in FIG. 6 or FIG. 8 can be obtained directly, and details are not repeated here.

FIG. 10 is a schematic structural diagram of a network device according to an embodiment of the present application. The network device 1000 includes a processor 1010 and a communication interface 1020. The processor 1010 and the communication interface 1020 are coupled to each other. It can be understood that the communication interface 1020 can be a transceiver or an input-output interface. Optionally, the network device 1000 may further include a memory 1030 for storing instructions executed by the processor 1010 or input data required by the processor 1010 to run the instructions or data generated after the processor 1010 runs the instructions.

When the network device 1000 is used to implement the method shown in FIG. 3 , FIG. 5 , FIG. 6 or FIG. 8 , the processor 1010 is used to perform the function of the above-mentioned processing module 910 , and the communication interface 1020 is used to perform the function of the above-mentioned transceiver module 920 .

The specific connection medium between the communication interface 1020 , the processor 1010 , and the memory 1030 is not limited in the embodiments of the present application. In the embodiment of the present application, the communication interface 1020, the processor 1010, and the memory 1030 are connected through a bus 1040 in FIG. 10. The bus is represented by a thick line in FIG. 10, and the connection between other components is only for schematic illustration. , is not limited. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 10, but it does not mean that there is only one bus or one type of bus.

The memory 1030 may be used to store software programs and modules, such as program instructions/modules corresponding to the data transmission methods provided in the embodiments of the present application. The processor 1010 executes various functional applications by executing the software programs and modules stored in the memory 1030. and data processing. The communication interface 1020 can be used for signaling or data communication with other devices. The network device 1000 may have multiple communication interfaces 1020 in this application.

Wherein, the above-mentioned memory may be, but not limited to, random access memory (Random Access Memory, RAM), read-only memory (Read Only Memory, ROM), programmable read-only memory (Programmable Read-Only Memory, PROM), can Erasable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM), Electrical Erasable Programmable Read-Only Memory (EEPROM), etc.

The above-mentioned processor may be an integrated circuit chip with signal processing capability. The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; it may also be a digital signal processor (Digital Signal Processing, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

The method steps in the embodiments of the present application may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in RAM, flash memory, ROM, PROM, EPROM, EEPROM, registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium well known in the art . An exemplary storage medium is coupled to the processor, such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and storage medium may reside in an ASIC. Alternatively, the ASIC may be located in a network device or in an end device. Of course, the processor and the storage medium may also exist in the network device or the terminal device as discrete components.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable apparatus. The computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be downloaded from a website, computer, A server or data center transmits by wire or wireless to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server, data center, or the like that integrates one or more available media. The usable medium can be a magnetic medium, such as a floppy disk, a hard disk, and a magnetic tape; it can also be an optical medium, such as a digital video disc (DVD); it can also be a semiconductor medium, such as a solid state drive (solid state drive). , SSD).

In the various embodiments of the present application, if there is no special description or logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

The terms "first", "second" and "third" in the description and claims of the present application and the above drawings are used to distinguish different objects, rather than to limit a specific order.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations. Any embodiments or designs described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.

In this application, "at least one" means one or more, and "plurality" means two or more. "And/or", which describes the association relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, which can indicate: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A, B can be singular or plural. In the text description of this application, the character "/" generally indicates that the contextual objects are in an "or" relationship.

It can be understood that, the various numbers and numbers involved in the embodiments of the present application are only for the convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the sequence numbers of the above processes does not imply the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic.

Claims (16)

1. A data transmission method, characterized in that it is applied to a communication network, wherein the communication network includes a first user plane network element, a second user plane network element and a control plane network element, the control plane network elements are respectively connected to the first user plane network element. A user plane network element and the second user plane network element, the method is performed by the control plane network element, and the method includes:

   The control plane network element obtains a first instruction, where the first instruction is used to instruct the control plane network element to switch the user entry of the terminal device from the first user plane network element to the second user plane network element Yuan;

   The control plane network element skips the step of sending a deletion instruction to the first user plane network element, and sends the user entry to the second user plane network element according to the first instruction, and the deletion instruction It is used to instruct the first user plane network element to delete the user entry on the first user plane network element.
2. The method according to claim 1, wherein the communication network further comprises a handover network element and a decision-making network element, the decision-making network element is respectively connected to the control plane network element and the handover network element, and the decision network element is connected to the control plane network element and the handover network element respectively. After the control plane network element sends the user entry to the second user plane network element according to the first instruction, the method further includes:

   The control plane network element notifies the decision network element to send a second instruction to the switching network element, where the second instruction instructs the switching network element to connect the terminal device to the second user plane network element corresponding to the Interface.
3. The method according to claim 2, wherein after the control plane network element notifies the decision network element to send the second instruction, the method further comprises:

   The control plane network element sends a route advertisement instruction to the second user plane network element, where the route advertisement instruction instructs the second user plane network element to publish a route to the terminal device.
4. The method according to claim 2 or 3, wherein after the control plane network element notifies the decision network element to send the second instruction, the method further comprises:

   The control plane network element sends the deletion instruction to the first user plane network element.
5. A data transmission method, characterized in that it is applied to a communication network, wherein the communication network includes a first user plane network element, a second user plane network element, a control plane network element, a decision network element and a handover network element, the control The plane network element is respectively connected to the decision network element, the first user plane network element and the second user plane network element, the decision network element is connected to the handover network element, and the method is performed by the decision network element. meta-execution, the method includes:

   The decision-making network element generates a first instruction according to the service level agreement and/or the load condition of the communication network, where the first instruction is used to instruct the control plane network element to change the user entry of the terminal device from the first instruction. switching the user plane network element to the second user plane network element;

   sending, by the decision network element, the first instruction to the control plane network element;

   After the decision-making network element receives the response message of the first instruction, a second instruction is generated, and the response message indicates that the control plane network element has sent the user entry to the second user plane a network element, where the second instruction is used to instruct the switching network element to access the terminal device to the interface corresponding to the second user plane network element;

   The decision network element sends the second instruction to the handover network element.
6. The method according to claim 5, wherein the method further comprises:

   generating, by the decision-making network element, a third instruction, where the third instruction instructs the switching network element to disconnect the terminal device from the interface corresponding to the first user plane network element;

   The decision-making network element sends the third instruction to the switching network element after a preset timer expires.
7. A communication data transmission method, characterized by being applied to a communication network, the communication network comprising a first user plane network element, a second user plane network element, a control plane network element, a decision network element and a handover network element, the The control plane network element is respectively connected to the decision network element, the first user plane network element and the second user plane network element, the decision network element is connected to the handover network element, and the method includes:

   The decision-making network element generates a first instruction according to the service level agreement and/or the load condition of the communication network, and sends the first instruction to the control plane network element, where the first instruction is used to indicate the the control plane network element switches the user entry of the terminal device from the first user plane network element to the second user plane network element;

   The control plane network element obtains the first instruction, skips the step of sending a deletion instruction to the first user plane network element, and sends the second user plane network element according to the first instruction User entry, the deletion instruction is used to instruct the first user plane network element to delete the user entry on the first user plane network element; after sending the user entry to the user interface according to the first instruction After the second user plane network element, send a response message to the decision-making network element, where the response message indicates that the control plane network element has sent the user entry to the second user plane network element;

   After the decision-making network element receives the response message, the decision-making network element generates a second instruction, and sends the second instruction to the switching network element, where the second instruction is used to instruct the switching network element connecting the terminal device to the interface corresponding to the second user plane network element;

   The switching network element connects the terminal device to the interface corresponding to the second user plane network element according to the second instruction.
8. The method according to claim 7, wherein after the control plane network element notifies the decision network element to send the second instruction, the method further comprises:

   The control plane network element sends a route advertisement instruction to the second user plane network element, where the route advertisement instruction instructs the second user plane network element to publish a route to the terminal device.
9. The method according to claim 7, wherein after the control plane network element notifies the decision network element to send the second instruction, the method further comprises:

   The control plane network element sends the deletion instruction to the first user plane network element.
10. The method according to claim 7, wherein the method further comprises:

    generating, by the decision network element, a third instruction, where the third instruction instructs the switching network element to disconnect the terminal device from the interface corresponding to the first user plane;

    The decision-making network element sends the third instruction to the switching network element after a preset timer expires.
11. A communication network, characterized in that the communication network includes a first user plane network element, a second user plane network element, a control plane network element, a decision network element, and a handover network element, and the control plane network elements are respectively connected to the the decision-making network element, the first user plane network element and the second user plane network element, the decision-making network element is connected to the handover network element;

    The decision-making network element is configured to generate a first instruction according to the service level agreement and/or the load condition of the communication network, and send the first instruction to the control plane network element, where the first instruction is used for instructing the control plane network element to switch the user entry of the terminal device from the first user plane network element to the second user plane network element;

    The control plane network element is configured to obtain the first instruction, skip the step of sending a deletion instruction to the first user plane network element, and send the second user plane network element according to the first instruction For the user entry, the deletion instruction is used to instruct the first user plane network element to delete the user entry on the first user plane network element; after sending the user entry according to the first instruction After the entry is sent to the second user plane network element, the control plane network element is further configured to send a response message to the decision-making network element, where the response message indicates that the control plane network element has sent the user entry to the second user plane network element;

    The decision-making network element is further configured to generate a second instruction after receiving the response message, and send the second instruction to the switching network element, where the second instruction is used to instruct the switching network element to The terminal device accesses the interface corresponding to the second user plane network element;

    The switching network element is configured to access the terminal device to the interface corresponding to the second user plane network element according to the second instruction.
12. The communication network according to claim 11, wherein the control plane network element is further configured to send a route advertisement instruction to the second user plane network element, wherein the route advertisement instruction instructs the second user plane The route advertised by the network element to the terminal device.
13. The communication network according to claim 11, wherein the control plane network element is further configured to send the deletion instruction to the first user plane network element.
14. The communication network according to claim 11, wherein the decision-making network element is further configured to generate a third instruction, wherein the third instruction instructs the switching network element to disconnect the terminal device from the first The connection of the interface corresponding to the user plane;

    The decision-making network element is further configured to send the third instruction to the switching network element after a preset timer expires.
15. A network device, characterized by comprising: a processor and a memory, the memory being used to store computer instructions, when the processor executes the instructions, the network device executes any one of claims 1-10 method described in item.
16. A computer-readable storage medium, characterized in that, a computer program or instruction is stored in the storage medium, and when the computer program or instruction is executed by a network device, any one of claims 1-10 is implemented. method.

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