CN114765591A

CN114765591A - Data transmission method, device and storage medium

Info

Publication number: CN114765591A
Application number: CN202011632077.2A
Authority: CN
Inventors: 程志密; 胡渭琦; 孙万飞
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-07-19
Anticipated expiration: 2040-12-31
Also published as: CN114765591B

Abstract

An embodiment of the application provides a data transmission method, a data transmission device and a storage medium, wherein the method comprises the following steps: the SMF determines a main user plane connection path and a standby user plane connection path which are not intersected based on the main-standby relation between the main receiving equipment and the standby receiving equipment; sending corresponding first message processing logic only to each first forwarding device on the main user plane connection path, or sending corresponding second message processing logic to each first forwarding device on the main user plane connection path and sending corresponding third message processing logic to each second forwarding device on the spare user plane connection path at the same time; forwarding devices existing on the main user plane connection path and the standby user plane connection path at the same time are public forwarding devices, and message processing logic on the public forwarding devices is used for indicating data transmission through the main user plane connection path. The embodiment of the application improves the utilization rate of network resources.

Description

Data transmission method, device and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a data transmission method, an apparatus, and a storage medium.

Background

In some application scenarios, such as border reconnaissance or weather reconnaissance, a large number of sensor nodes are required to be deployed to collect data, and the transmission of such important data requires high reliability, so that how to realize reliable transmission of data to a destination is a problem. For improving the reliability of data transmission, the 3rd Generation Partnership Project (3 GPP) protocol specification provides for supporting redundant transmission over the N3/N9 interface, end-to-end redundant user plane paths based on dual connectivity, and redundant transmission mechanisms at the transport layer, but these schemes result in a waste of network resources and increase the complexity of the network element (packet duplication or packet duplication elimination).

Disclosure of Invention

The embodiment of the application provides a data transmission method, a data transmission device and a storage medium, which are used for solving the problem of network resource waste in the existing data transmission process.

In a first aspect, an embodiment of the present application provides a data transmission method, including:

the session management function SMF determines a main user plane connection path and a standby user plane connection path which are not intersected based on a main-standby relation between a main receiving device and a standby receiving device which are deployed in advance;

sending corresponding first message processing logic only to each first forwarding device on the main user plane connection path, or simultaneously sending corresponding second message processing logic to each first forwarding device on the main user plane connection path and sending corresponding third message processing logic to each second forwarding device on the standby user plane connection path;

the forwarding devices existing on the main user plane connection path and the standby user plane connection path at the same time are public forwarding devices, the message processing logic on the public forwarding devices is used for indicating data transmission through the main user plane connection path, and the message processing logic comprises the first message processing logic, the second message processing logic and the third message processing logic.

In a second aspect, an embodiment of the present application provides an SMF, including a memory, a transceiver, a processor:

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

In a third aspect, an embodiment of the present application provides a data transmission apparatus, including:

the determining module is used for determining a main user plane connection path and a standby user plane connection path which are not intersected based on a main-standby relation between a main receiving device and a standby receiving device which are deployed in advance;

a sending module, configured to send a corresponding first packet processing logic only to each first forwarding device on the main user plane connection path, or send a corresponding second packet processing logic to each first forwarding device on the main user plane connection path and send a corresponding third packet processing logic to each second forwarding device on the standby user plane connection path at the same time;

In a fourth aspect, embodiments of the present application provide a processor-readable storage medium, which stores a computer program for causing a processor to execute the method of the first aspect.

According to the data transmission method, the device and the storage medium provided by the embodiment of the application, the corresponding first message processing logic is sent only to the first forwarding equipment on the main user plane connection path, or the corresponding second message processing logic is sent to each first forwarding equipment on the main user plane connection path and the corresponding third message processing logic is sent to each second forwarding equipment on the standby user plane connection path at the same time, and the message processing logic is used for indicating that data transmission is carried out through the main user plane connection path, so that the data transmission process of a single path is realized, the simultaneous data transmission on two non-intersected paths is avoided, the utilization rate of network resources is improved, and the problem of low network resource utilization rate of the existing redundant transmission scheme is solved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following descriptions are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a flow chart illustrating steps of a data transmission method according to an embodiment of the present application;

fig. 2 is an architecture diagram of the present application when the primary receiving device and the standby receiving device are in the same DN;

fig. 3 is an architecture diagram of the present application when the primary and backup receiving devices are in different DNs.

FIG. 4 is a schematic structural diagram of an SMF in an embodiment of the present application;

fig. 5 is a block diagram of a data transmission device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the current redundant transmission of high reliability Communication, in order to support a high reliability Low Latency (URLLC) service, a terminal (UE) may establish two redundant Protocol Data Unit (PDU) sessions on a 5G network, so that a 5G system sets user plane paths of the two redundant PDU sessions to be disjoint. The user's subscription indicates whether the user is allowed to have a redundant PDU Session, and this indication is provided from a Unified Data Management Function (UDM) to a Session Management Function (SMF).

When redundancy is applied, one PDU session is connected from the terminal via a primary Radio Access Network (RAN) to a User Plane Function (UPF 1) acting as a PDU session anchor, and another PDU session is connected from the terminal via a secondary RAN to a UPF2 acting as a PDU session anchor. As described in TS 37.340, the NG-RAN may implement redundant user-plane resources (i.e., primary and secondary NG-RANs) or a single NG-RAN node for a PDU session with two NG-RAN nodes. In both cases there is an N1 interface to the access and mobility management functions (AMF).

Based on the two PDU sessions, two independent user plane paths are established. The UPFs 1 and 2 are connected to the same Data Network (DN), i.e., traffic passing through the UPFs 1 and 2 may be routed through different user plane nodes within the DN.

Wherein, in order to establish two redundant PDU sessions and associate repeated traffic from the same application with these PDU sessions, either UE routing Policy (URSP) or UE local configuration is used, as specified in TS 23.503.

In addition, the redundant user plane setup is applicable to both IP and ethernet PDU sessions.

However, a high reliability communication scheme using a redundant transmission mechanism (data is transmitted simultaneously on two non-intersecting paths) to realize data transmission may cause network resource waste and may increase the complexity of a network element (RAN or UPF), including duplication of a message to be processed or elimination of a duplicate message.

Therefore, embodiments of the present application provide a data transmission method, an apparatus, and a storage medium, so as to solve the problem of network resource waste caused by the existing transmission scheme.

The method and the device are based on the same application concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

The technical scheme provided by the embodiment of the application can be suitable for various systems, particularly 5G systems. For example, suitable systems may be global system for mobile communications (GSM) systems, Code Division Multiple Access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) systems, Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, long term evolution (long term evolution) systems, LTE-a systems, universal mobile systems (universal mobile telecommunications systems, UMTS), universal internet Access (world interoperability for microwave Access (WiMAX) systems, New Radio interface (NR) systems, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5GS), and the like.

The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be called a User Equipment (UE). A wireless terminal device, which may be a mobile terminal device such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal device, for example, a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN). Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application. Since the terminal device forms a network capable of supporting communication with other network devices (e.g., a core network device, an access network device (i.e., a base station)), the terminal device is also considered as a network device in the present invention.

Furthermore, it should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The present application is explained in detail below.

As shown in fig. 1, which is a flowchart illustrating steps of a data transmission method in an embodiment of the present application, the method includes the following steps:

step 101: the SMF determines a non-intersected main user plane connection path and a non-intersected standby user plane connection path based on a main-standby relation between a pre-deployed main receiving device and a pre-deployed standby receiving device.

Specifically, when a terminal initiates a session establishment request to a pre-deployed primary receiving device and a pre-deployed secondary receiving device, and the SMF receives the session establishment request, the SMF may perform user plane selection based on the primary-secondary relationship between the primary receiving device and the secondary receiving device, and select two disjoint primary user plane connection paths and a disjoint secondary user plane connection path, that is, N9/N6 disjoint primary and secondary paths.

The primary-standby relationship between the primary receiving device and the standby receiving device can be configured by a network administrator or configured by a network policy or the like.

In addition, the two sessions initiated by the terminal adopt the same session IP, that is, the data transmitted to the main receiving device and the standby receiving device are ensured to be the same data.

In addition, a public forwarding device exists in the main user plane connection path and the standby user plane connection path, and the forwarding devices existing in the main user plane connection path and the standby user plane connection path are the public forwarding devices, so that when data reach the public forwarding devices of the main user plane connection path and the standby user plane connection path, the public forwarding devices can determine which path the data are transmitted through based on message processing logic, and further, the data transmission process of a single path can be realized.

Specifically, the common forwarding device may be a common endpoint device of the primary user plane connection path and the standby user plane connection path.

Step 102: and sending the corresponding first message processing logic to each first forwarding device on the main user plane connection path only, or sending the corresponding second message processing logic to each first forwarding device on the main user plane connection path and sending the corresponding third message processing logic to each second forwarding device on the spare user plane connection path simultaneously.

Specifically, the message processing logic on the public forwarding device is configured to instruct data transmission through the primary user plane connection path, and the message processing logic includes a first message processing logic, a second message processing logic, and a third message processing logic.

Specifically, each forwarding device has its own message processing logic, so that each forwarding device can perform data transmission based on its own message processing logic, and the forwarding device includes a first forwarding device and a second forwarding device, and may be a UPF or a PDU session anchor Point (PSA).

Specifically, only sending the corresponding first message processing logic to each first forwarding device is only relative to other message processing logic, and does not limit other information sent to the first forwarding device.

In addition, because the message processing logic on the public forwarding equipment indicates that data transmission is carried out through the main user plane connection path, when the public forwarding equipment carries out data transmission according to the message processing logic, the data transmission can be carried out through the main user plane connection path, the data transmission is realized only through the main user plane connection path in the data transmission process, the data transmission through the standby user plane connection path is avoided redundantly, the data transmission on two non-intersected paths is avoided, the utilization rate of network resources is improved, and complex processing including copying or eliminating and the like is not carried out on the data messages through the system network elements any more, and the implementation complexity of the system network elements is reduced.

In this way, in this embodiment, only the corresponding first packet processing logic is sent to the first forwarding device on the main user plane connection path, or the corresponding second packet processing logic is sent to each first forwarding device on the main user plane connection path and the corresponding third packet processing logic is sent to each second forwarding device on the standby user plane connection path at the same time, and the main user plane connection path and the standby user plane connection path have a common forwarding device, and the packet processing logic on the common forwarding device is used to instruct the main user plane connection path to perform data transmission, so that a transmission process of a single path for data is implemented, data is prevented from being transmitted on two non-intersecting paths at the same time, the utilization rate of network resources is improved, and the problem of low network resource utilization rate in the existing redundant transmission scheme is solved.

Optionally, in this embodiment, a corresponding first packet processing logic may be sent to each first forwarding device through a Software Defined Network (SDN) controller, or a corresponding second packet processing logic and a corresponding third packet processing logic may be sent to each first forwarding device and each second forwarding device simultaneously. That is, the SMF may issue the message processing logic to the SDN controller first, and then the SDN controller issues the message processing logic to the corresponding forwarding device.

Optionally, in this embodiment, the first packet processing logic includes a source IP address or a destination IP address of the data to be transmitted, an output port of the data to be transmitted, and a priority of the first packet processing logic.

Specifically, when performing uplink transmission, the first message processing logic may include a source IP address of the data to be transmitted, and when performing downlink transmission, the first message processing logic may include a destination IP address of the data to be transmitted. Of course, both the source IP address and the destination IP address are session IP addresses.

For any one of the first forwarding devices, when the data to be transmitted reaches the first forwarding device, in the first message logic corresponding to the first forwarding device, the output port of the data to be transmitted is the output port of the first forwarding device.

In addition, the present embodiment does not specifically limit the priority of the first packet processing logic. Specifically, the SMF only sends the corresponding first packet processing logic to each first forwarding device on the main user plane connection path, and does not send the packet processing logic to the second forwarding device on the standby user plane connection path, so that the common forwarding devices (the first forwarding device and the second forwarding device at the same time) on the main user plane connection path and the standby user plane connection path can only transmit data through the first packet processing logic, and thus transmission through the main user plane connection path is achieved.

The second message processing logic comprises a source IP address or a destination IP address of data to be transmitted, an output port of the data to be transmitted and the priority of the second message processing logic, and the priority of the second message processing logic is higher than that of the third message processing logic on each first forwarding device or the public forwarding device;

the third message processing logic includes a source IP address or a destination IP address of data to be transmitted, an output port of the data to be transmitted, and a priority of the third message processing logic, and the priority of the second message processing logic is higher than the priority of the third message processing logic on each of the second forwarding devices or the common forwarding device.

Specifically, when performing uplink transmission, the second message processing logic and the third message processing logic may include a source IP address of the data to be transmitted, and when performing downlink transmission, the second message processing logic and the third message processing logic may include a destination IP address of the data to be transmitted.

For any one of the second forwarding devices, when the data to be transmitted reaches the second forwarding device, in the third message processing logic corresponding to the second forwarding device, the output port of the data to be transmitted is the output port of the second forwarding device.

In addition, the priority of the second message processing logic is set to be higher than that of the third message processing logic on each first forwarding device and each second forwarding device, so that data transmission can be performed through the second message processing logic on the basis of priority selection on common forwarding devices (the first forwarding device and the second forwarding device at the same time) of a main user plane connection path and a standby user plane connection path, and data transmission can be performed through the main user plane connection path.

Certainly, based on that the used packet processing logic can be determined on the common forwarding device of the primary user plane connection path and the standby user plane connection path, and then the selected data transmission path is determined, therefore, the priority of the second packet processing logic may be set higher than that of the third packet processing logic only on the common forwarding device, so as to ensure that data transmission is performed through the primary user plane connection path, without setting the priorities of the second packet processing logic and the third packet processing logic on other first forwarding devices and second forwarding devices.

In addition, optionally, in this embodiment, when it is detected that the primary user plane connection path fails, the data transmission path is controlled to be switched from the primary user plane connection path to the secondary user plane connection path, so as to implement a high-reliability data transmission process.

The following describes a process of switching a data transmission path from a primary user plane connection path to a secondary user plane connection path.

In a first case, when sending the corresponding first packet processing logic only to each first forwarding device on the primary user plane connection path:

in this case, when the control data transmission path is switched from the primary user plane connection path to the secondary user plane connection path, any one of the following manners may be adopted:

first, a corresponding fourth message processing logic is sent to each second forwarding device on the backup user plane connection path, where the fourth message processing logic includes a source IP address or a destination IP address of data to be transmitted, an output port of the data to be transmitted, and a priority of the fourth message processing logic, and on each second forwarding device or the common forwarding device, the priority of the fourth message processing logic is higher than that of the first message processing logic.

Specifically, the fourth message processing logic includes a source IP address or a destination IP address of the data to be transmitted and an output port of the data to be transmitted, so that the second forwarding device receiving the fourth message processing logic can transmit the data based on the IP address and the output port.

In addition, specifically, the priority of the fourth message processing logic is set to be higher than that of the first message processing logic on each second forwarding device, so that data transmission can be performed through the fourth message processing logic on the common forwarding device of the main user plane connection path and the standby user plane connection path based on priority selection, data transmission can be performed through the standby user plane connection path, and a conversion process from the main user plane connection path to the standby user plane connection path is further achieved.

Of course, based on that the used packet processing logic can be determined on the common forwarding device of the primary user plane connection path and the standby user plane connection path, and then the selected data transmission path is determined, therefore, the priority of the fourth packet processing logic can be set higher than that of the first packet processing logic only on the common forwarding device, so as to ensure that the data transmission is switched to the second packet processing logic on the standby user plane connection path, without setting the priorities of the fourth packet processing logic on other second forwarding devices.

And secondly, sending a corresponding fifth message processing logic to each second forwarding device on the standby user plane connection path, and deleting all first message processing logics on the main user plane connection path or the first message processing logics of the public forwarding device.

The fifth message processing logic comprises a source IP address or a destination IP address of the data to be transmitted, an output port of the data to be transmitted and the priority of the fifth message processing logic.

Specifically, when the SMF sends the corresponding fifth packet processing logic to each second forwarding device on the backup user plane connection path, all the first packet processing logics on the primary user plane connection path are deleted, that is, the first packet processing logics on the common forwarding device of the primary user plane connection path and the backup user plane connection path are deleted, so that the common forwarding device can only perform data transmission through the fifth packet processing logic, and data transmission through the backup user plane connection path is implemented.

For the same reason, only the first packet processing logic of the common forwarding device may be deleted without deleting the first packet processing logic on other first forwarding devices, and the common forwarding device may also perform data transmission only through the fifth packet processing logic, so that data transmission is performed through the standby user plane connection path, and at this time, the priority of the fifth packet processing logic may also not be limited.

In the second case: when a corresponding second message processing logic is sent to each first forwarding device on the main user plane connection path and a corresponding third message processing logic is sent to each second forwarding device on the standby user plane connection path at the same time:

at this time, when the control data transmission path is switched from the main user plane connection path to the standby user plane connection path, all the first packet processing logic on the main user plane connection path or the first packet processing logic of the common forwarding device may be deleted.

Specifically, because the corresponding third message processing logic is already sent to each second forwarding device on the standby user plane connection path, when the main user plane connection path fails, all first message processing logics on the main user plane connection path are deleted, that is, the first message processing logics on the common forwarding device of the main user plane connection path and the standby user plane connection path are also deleted at the moment, so that when the data to be transmitted reach the common forwarding device in the main user plane connection path and the standby user plane connection path, the data transmission can be performed only through the second message processing logics, and therefore the data transmission path is converted from the main user plane connection path to the standby user plane connection path.

Similarly, the SMF deletes the first packet processing logic of the common forwarding device in the main user plane connection path and the backup user plane connection path, so that data transmission can be performed only through the second packet processing logic corresponding to the common forwarding device, and the common forwarding device is the endpoint device of the main user plane connection path and the backup user plane connection path, thereby realizing that the data transmission path is switched from the main user plane connection path to the backup user plane connection path.

Therefore, the conversion process of converting the data transmission path from the main user plane connection path to the standby user plane connection path is realized by any mode.

It should be further noted that, in order to ensure that the terminal can smoothly transmit and receive data to and from the standby receiving device after the data transmission path is switched, the SMF may operate the message processing logic configured on the second forwarding on the standby user plane connection path so that the destination address (including, but not limited to, the IP address and the MAC address) of the message is correct. That is, the SMF may operate the third message processing logic, the fourth message processing logic, or the fifth message processing logic, and modify the destination address of the data to be transmitted to an address that enables the receiving device to correctly receive the data.

Specifically, during uplink transmission, the destination address of the data to be transmitted is the address of the standby receiving device, and during downlink transmission, the destination address of the data to be transmitted is the address of the terminal.

By modifying the destination address of the data to be transmitted, the terminal does not need to perform adaptive work after the destination receiving equipment is replaced, and the implementation complexity of the terminal is reduced.

The present application is illustrated by the following specific examples.

As shown in fig. 2 and 3, fig. 2 is an architecture diagram in which a main receiving device and a standby receiving device are on the same DN, and fig. 3 is an architecture diagram in which the main receiving device and the standby receiving device are on different DNs.

In fig. 2 and 3, the forwarding device 1 and the forwarding device 2 form a primary user plane connection path, and the forwarding device 1 and the forwarding device 3 form a secondary user plane connection path. The SMF sends a corresponding message processing logic to each forwarding device (forwarding device 1, forwarding device 2, and forwarding device 3) on the primary user plane connection path and the backup user plane connection path through the SDN controller.

The forwarding device 1 is a common forwarding device (both a first forwarding device and a second forwarding device) of the primary user plane connection path and the backup user plane connection path. In the main user plane connection path, the output port numbers of the first forwarding device and the second forwarding device are both 2 during uplink transmission, and the output port numbers of the first forwarding device and the second forwarding device are both 1 during downlink transmission; in the standby user plane connection path, the output port number of the first forwarding device is 3 during uplink transmission, the output port number of the third forwarding device is 4, the output port number of the third forwarding device is 2 during downlink transmission, and the output port number of the first forwarding device is 1.

In addition, in the main user plane connection path and the standby user plane connection path, the public forwarding device next to the RAN is a RAN-side forwarding device, the first forwarding device next to the DN is a DN-side forwarding device, and the second forwarding device next to the DN is a DN-side forwarding device; that is, in fig. 2 and 3, forwarding device 1 is a RAN-side forwarding device, and forwarding device 2 and forwarding device 3 are DN-side forwarding devices. Of course, if there are other forwarding devices between the forwarding device 1 and the forwarding device 2, and between the forwarding device 1 and the forwarding device 3, the forwarding devices are intermediate forwarding devices.

The IP of the message of the UE is set to be IP1, and the MAC address is set to be MAC 1; the MAC address of the main receiving equipment is MAC11, and the IP address is IP 11; the MAC address of the receiving device is MAC12 and the IP address is IP 12.

When the UE sends a data packet, it first reaches the forwarding device 1 through the RAN, and the forwarding device 1 performs path selection based on the packet processing logic.

In the first embodiment, a corresponding second packet processing logic is simultaneously sent to each first forwarding device on the main user plane connection path, and a corresponding third packet processing logic is simultaneously sent to each second forwarding device on the standby user plane connection path:

after receiving a session establishment request of the UE, the SMF executes the establishment of the active/standby path according to the active/standby relationship of the receiving equipment. SMF executes the selection of the main user plane connection path and the standby user plane connection path, allocates IP address for the UE (the IP address can also be acquired from UDM and configured statically), and issues message processing logic on the main and standby paths.

Example 1.1: SMF sends corresponding message processing logic to main user interface connection path and standby user interface connection path at the same time, and modifies destination address by forwarding device at RAN side on standby user interface connection path.

Wherein, on the main user plane connection path, for all forwarding devices on the user plane, the uplink packet processing logic is as shown in table 1 below:

TABLE 1

Match	Priority level	Actions
			Source IP address (Session IP address)	A	Output to port x

In the connection path of the main user plane, for all forwarding devices on the user plane, the downlink packet processing logic is as shown in table 2 below:

TABLE 2

Match	Priority level	Actions
			Destination IP Address (Session IP Address)	A	Output to port y

On the connection path of the standby user plane, for the intermediate forwarding device on the user plane, the uplink message processing logic is as shown in table 3 below:

TABLE 3

For the intermediate forwarding device on the user plane on the connection path of the standby user plane, the downlink message processing logic is as shown in table 4 below:

TABLE 4

Match	Priority level	Actions
			Destination IP Address (Session IP Address)	B (less than A)	Output to port y

On the connection path of the standby user plane, the RAN-side forwarding device (the forwarding device 1 in fig. 2 and 3) modifies the destination address of the uplink message processing logic, and the process is shown in table 5 below:

TABLE 5

On the connection path of the standby user plane, the RAN-side forwarding device modifies the destination address of the downlink message processing logic, and the process is as shown in table 6 below:

TABLE 6

For the learning of the MAC address of the receiving device, the SDN controller may obtain the MAC address through an ARP learning process, may obtain the MAC address through MAC learning, or other manners, which are not specifically limited herein.

Specifically, if the above-mentioned message processing logic is specifically applied to fig. 2 and fig. 3, then at the forwarding device 1, for the uplink transmission of the primary user plane connection path, the message processing logic is: priority: a, match: source IP1, actions: output: 2; aiming at the downlink transmission of the main user interface connection path, the message processing logic is as follows: priority level: a, match: destination IP1, actions: output: 1; for the uplink transmission of the connection path of the standby user plane, the message processing logic is as follows: priority: b, match: source IP1, actions: IP11- > IP12, MAC11- > MAC12, actions: output: 3; for the downlink transmission of the connection path of the standby user plane, the message processing logic is as follows: priority: b, match: destination IP1, actions: IP12- > IP11, MAC12- > MAC11, actions: output: 1.

at the forwarding device 2, for uplink transmission of the main user plane connection path, the message processing logic is: priority level: a, match: source IP1, actions: output: 2; aiming at the downlink transmission of the main user interface connection path, the message processing logic is as follows: priority level: a, match: destination IP1, actions: output: 1.

at the forwarding device 3, for the uplink transmission of the connection path of the standby user plane, the message processing logic is: priority: b, match: source IP1, actions: output: 4; for the downlink transmission of the connection path of the standby user plane, the message processing logic is as follows: priority level: b, match: destination IP1, actions: output: 2.

example 1.2: the SMF simultaneously issues corresponding message processing logic to the main user plane connection path and the standby user plane connection path, and modifies the destination address by a DN side forwarding device (such as forwarding device 3 in fig. 2 and 3) on the standby user plane connection path.

Wherein, on the connection path of the main user plane, for all forwarding devices on the user plane, the uplink message processing logic is as shown in table 1 above; in the connection path of the main user plane, for all forwarding devices on the user plane, the downlink packet processing logic is as shown in table 2 above.

On the connection path of the backup user plane, for the RAN-side forwarding device on the user plane and other forwarding devices on the user plane (the other forwarding devices include the DN-side forwarding device and intermediate forwarding devices between the RAN-side forwarding device and the DN-side forwarding device), the uplink message processing logic is as shown in table 3 above; for the RAN-side forwarding device on the user plane and other forwarding devices on the user plane on the connection path of the standby user plane, the downlink packet processing logic is as shown in table 4 above.

On the connection path of the standby user plane, modifying the destination address of the uplink message processing logic through the DN side forwarding device, wherein the process is as shown in the table 5; on the connection path of the standby user plane, the destination address of the downlink message processing logic is modified through the DN-side forwarding device, and the process is as shown in table 6 above.

Specifically, the message processing logic is specifically applied to fig. 2 and fig. 3, which is specifically shown in embodiment 1.1, and is not described in detail here.

It should be noted that, of course, destination addresses of the uplink packet processing logic and the downlink packet processing logic may also be modified by using an intermediate forwarding device between the RAN-side forwarding device and the DN-side forwarding device, which is connected to the spare user plane, as specifically shown in the above tables 5 and 6.

In a second embodiment, when the SMF simultaneously issues the packet processing logic of the main user plane connection path and the standby user plane connection path, the SMF selects to switch from the main user plane connection path to the standby user plane connection path:

specifically, the SDN controller reports topology information of the underlying forwarding device periodically and aperiodically, and the SMF determines a related path according to the received topology information. When the main user plane connection path has a fault, the SMF starts to switch from the main user plane connection path to the standby user plane connection path. The specific conversion method comprises the following steps: the SMF issues a message processing logic for deleting the connection path of the main user plane to the SDN controller; and after receiving the instruction, the SDN controller sends an instruction for deleting the message processing logic to the related forwarding equipment. There are two cases: one is to delete all message processing logics on the main user plane connection path; and the other is deleting the message processing logic corresponding to the main user plane connection path on the public forwarding equipment.

Example 2.1: when the SMF selects to switch from the main user plane connection path to the standby user plane connection path, the SMF deletes all message processing logics on the main user plane connection path.

Specifically, when the method is applied to fig. 2 and 3, the message processing logic, i.e., the second message processing logic, corresponding to the main user plane connection path on the forwarding device 1 and the forwarding device 2 is deleted, so that the forwarding device 1 can only perform data transmission through the remaining third message processing logic, and a conversion process from the main user plane connection path to the standby user plane connection path is realized.

Example 2.2: when the SMF selects to switch from the main user interface connection path to the standby user interface connection path, the SMF deletes the message processing logic corresponding to the main user interface connection path of the public forwarding equipment.

Specifically, when the method is applied to fig. 2 and fig. 3, the message processing logic corresponding to the main user plane connection path on the forwarding device 1, that is, the second message processing logic, is deleted, so that the forwarding device 1 can only perform data transmission through the remaining third message processing logic, and a conversion process from the main user plane connection path to the standby user plane connection path is implemented.

The third embodiment: SMF only issues the message processing logic of the main user plane connection path:

after receiving a session establishment request of the UE, the SMF executes the establishment of the active/standby path according to the active/standby relationship of the receiving equipment. The SMF performs the selection of the primary and standby paths, allocates an IP address to the UE (this IP address may also be obtained from the UDM, statically configured), and issues the message processing logic on the primary path. And after receiving the message processing logic on the main path, the SDN controller issues the message processing logic.

For the uplink transmission of the main user plane connection path, the message processing logic of all forwarding devices on the user plane is as shown in table 1 above; for the downlink transmission of the main user plane connection path, the message processing logic of all forwarding devices on the user plane is as shown in table 2 above.

Specifically, as applied to fig. 2 and fig. 3, the specific packet processing logic of the primary user plane connection path of the forwarding device 1 and the forwarding device 2 is described in the first embodiment, and details are not described here again.

It should be noted that, of course, because the SMF only issues the packet processing logic of the primary user plane connection path, at this time, the common forwarding device can only perform data transmission through the packet processing logic of the primary user plane connection path, and therefore, the priority level in the packet processing logic of the primary user plane connection path is not particularly limited.

The fourth embodiment: when SMF only issues the message processing logic of the main user interface connection path, the SMF selects to switch from the main user interface connection path to the standby user interface connection path:

and the SDN controller reports topology information of the underlying forwarding equipment regularly and irregularly, and the SMF judges the related paths according to the received topology information. When the primary path fails, the SMF initiates a switch from the primary path to the backup path: sending message processing logic on a standby path to an SDN controller; after receiving the instruction, the SDN controller sends a message processing logic to the forwarding equipment on the standby path, wherein the priority of the message processing logic is higher than that of the message processing logic on the main path.

Example 4.1: the RAN side forwarding equipment on the standby user plane connection path modifies the destination address, and the SMF performs switching from the main user plane connection path to the standby user plane connection path.

Wherein, on the connection path of the standby user plane, for the intermediate forwarding device on the user plane, the uplink message processing logic is as shown in the following table 7:

TABLE 7

Match	Priority level	Actions
			Source IP Address (Session IP Address)	C (greater than A)	Output to port x

For the intermediate forwarding device on the user plane on the connection path of the standby user plane, the downlink message processing logic is as shown in table 8 below:

TABLE 8

Match	Priority level	Actions
			Destination IP Address (Session IP Address)	C (greater than A)	Output to port y

On the connection path of the standby user plane, the RAN-side forwarding device modifies the destination address of the uplink message processing logic, and the process is as shown in the following table 9:

TABLE 9

On the connection path of the standby user plane, the RAN-side forwarding device modifies the destination address of the downlink message processing logic, and the process is as shown in the following table 10:

watch 10

Specifically, as applied to fig. 2 and fig. 3, for the connection path of the standby user plane, at the forwarding device 1, the message processing logic during uplink transmission is: priority level: c, match: source IP1, actions: IP11- > IP12, MAC11- > MAC12, actions: output: 3; the message processing logic during downlink transmission is as follows: priority level: c, match: destination IP1, actions: IP12- > IP11, MAC12- > MAC11, actions: output: 1. at the forwarding device 3, the message processing logic during uplink transmission is: priority level: c, match: source IP1, actions: output: 4; the message processing logic during downlink transmission is as follows: priority: c, match: destination IP1, actions: output: 2.

example 4.2: and modifying the destination address by DN-side forwarding equipment on the standby user plane connection path, and performing conversion from the main user plane connection path to the standby user plane connection path by the SMF.

Wherein, on the backup user plane connection path, for forwarding devices on the user plane (RAN-side forwarding devices and other forwarding devices on the user plane), the uplink message processing logic is as shown in table 7 above; for forwarding devices on the user plane (RAN-side forwarding devices and other forwarding devices on the user plane) on the connection path of the standby user plane, the downlink message processing logic is as shown in table 8 above.

On the connection path of the standby user plane, the destination address is modified to the uplink message processing logic through the DN side forwarding device on the user plane, and the process is as shown in table 9 above; on the connection path of the standby user plane, the destination address of the downlink message processing logic is modified through the forwarding device on the DN side of the user plane, and the process is shown in table 10 above.

Fifth embodiment: when SMF only issues the message processing logic of the main user interface connection path, the SMF selects to switch the main user interface connection path to the standby user interface connection path:

and the SDN controller reports topology information of the underlying forwarding equipment regularly and irregularly, and the SMF judges the related paths according to the received topology information. When the main path fails, the SMF will start switching from the main user plane connection path to the standby user plane connection path: the method comprises the steps of sending a message processing logic on a user interface connection path to an SDN controller and deleting part or all of the message processing logic on the main user interface connection path; and after receiving the instruction, the SDN controller issues a message processing logic to the forwarding equipment on the standby user plane connection path, and deletes the message processing logic on part or all of the forwarding equipment on the main user plane connection path. There are two cases: one is to delete all message processing logics on the main user plane connection path; the other is to delete the message processing logic of the common forwarding device.

Example 5.1: the message processing logic on the backup user plane connection path is downloaded and all the message processing logic on the main user plane connection path is deleted:

example 5.1.1: after receiving the instruction, the SDN controller issues a message processing logic to the forwarding device on the standby user plane connection path, the priority of the message processing logic does not make a requirement, and the RAN side forwarding device modifies the destination address.

Wherein, on the connection path of the standby user plane, for all forwarding devices on the user plane, the uplink message processing logic is as shown in the following table 11:

TABLE 11

For all forwarding devices on the user plane on the connection path of the standby user plane, the downlink message processing logic is as shown in table 12 below:

TABLE 12

On the connection path of the standby user plane, the RAN-side forwarding device modifies the destination address of the uplink message processing logic, and the process is as shown in table 13 below:

watch 13

On the connection path of the standby user plane, the RAN-side forwarding device modifies the destination address of the downlink message processing logic, and the process is as shown in table 14 below:

TABLE 14

Specifically, when the method is applied to fig. 2 and fig. 3, the message processing logic of the primary user plane connection path on the forwarding device 1 and the message processing logic on the forwarding device 2 are deleted.

Example 5.1.2: after receiving the instruction, the SDN controller issues a message processing logic to the forwarding equipment on the standby user plane connection path, the priority of the message processing logic does not make a requirement, and the DN side forwarding equipment modifies the destination address.

Wherein, on the connection path of the standby user plane, for the forwarding device on the user plane, the uplink message processing logic is as shown in table 11 above; for the forwarding device on the user plane on the connection path of the standby user plane, the downlink message processing logic is as shown in table 12 above.

On the connection path of the standby user plane, modifying the destination address of the uplink message processing logic through the forwarding device on the DN side of the user plane, wherein the process is shown in the table 13; on the connection path of the standby user plane, the destination address of the downlink message processing logic is modified through the forwarding device on the DN side of the user plane, and the process is as shown in table 14 above.

Example 5.2: and the message processing logic on the connection path of the backup user plane is deleted:

example 5.2.1: and after receiving the instruction, the SDN controller transmits a message processing logic to the forwarding equipment on the standby user plane connection path, the priority of the message processing logic does not make a requirement, and the RAN side forwarding equipment on the standby user plane connection path modifies a destination address.

Wherein, on the connection path of the standby user plane, for all forwarding devices on the user plane, the uplink message processing logic is as shown in the following table 15:

watch 15

For all forwarding devices on the user plane on the connection path of the standby user plane, the downlink message processing logic is as shown in table 16 below:

TABLE 16

On the connection path of the standby user plane, the RAN-side forwarding device modifies the destination address of the uplink message processing logic, and the process is as shown in the following table 17:

TABLE 17

On the connection path of the standby user plane, the RAN-side forwarding device modifies the destination address of the downlink message processing logic, and the process is as shown in table 18 below:

watch 18

When the method is applied to fig. 2 and fig. 3, the message processing logic of the primary user plane connection path on the forwarding device 1 is deleted, so that the forwarding device 1 can only perform data transmission through the message processing logic of the backup user plane connection path, and the conversion process of the data transmission path is realized.

Example 5.2.2: after receiving the instruction, the SDN controller issues a message processing logic to the forwarding equipment on the standby user plane connection path, the priority of the message processing logic does not make a requirement, and the DN side forwarding equipment on the standby user plane connection path modifies the destination address.

Wherein, on the connection path of the standby user plane, for the forwarding device on the user plane, the uplink message processing logic is as shown in table 15 above; for the forwarding device on the user plane on the connection path of the standby user plane, the downlink message processing logic is as shown in table 16 above.

On the connection path of the standby user plane, modifying the destination address of the uplink message processing logic through the forwarding device on the DN side of the user plane, wherein the process is shown in the table 17; on the connection path of the standby user plane, the destination address of the downlink message processing logic is modified through the forwarding device on the DN side of the user plane, and the process is shown in table 18 above.

By any of the above embodiments, the issue of the message processing logic and the path change are realized.

Fig. 4 is a schematic structural diagram of an SMF according to an embodiment of the present application, and includes a memory 420, a transceiver 400, and a processor 410.

Where in fig. 4, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 410 and various circuits of memory represented by memory 420 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 400 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. The processor 410 is responsible for managing the bus architecture and general processing, and the memory 420 may store data used by the processor 410 in performing operations.

The processor 410 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.

A memory 420 for storing a computer program; a transceiver 400 for transceiving data under the control of the processor; a processor 410 for reading the computer program in the memory and performing the following operations:

the forwarding devices existing on the main user plane connection path and the standby user plane connection path at the same time are public forwarding devices, the message processing logic of the public forwarding devices is used for indicating data transmission through the main user plane connection path, and the message processing logic comprises the first message processing logic, the second message processing logic and the third message processing logic.

Optionally, the software defined network SDN controller is configured to send a corresponding first packet processing logic to each first forwarding device, or send a corresponding second packet processing logic to each first forwarding device and send a corresponding third packet processing logic to each second forwarding device at the same time.

Optionally, the first packet processing logic includes a source IP address or a destination IP address of the data to be transmitted, an output port of the data to be transmitted, and a priority of the first packet processing logic.

Optionally, the second packet processing logic includes a source IP address or a destination IP address of data to be transmitted, an output port of the data to be transmitted, and a priority of the second packet processing logic, and on each of the first forwarding devices or the common forwarding device, the priority of the second packet processing logic is higher than the priority of the third packet processing logic;

Optionally, when it is detected that the primary user plane connection path fails, controlling a data transmission path to be switched from the primary user plane connection path to the secondary user plane connection path.

Optionally, when sending the corresponding first packet processing logic only to each first forwarding device on the primary user plane connection path, switching the control data transmission path from the primary user plane connection path to the secondary user plane connection path includes:

sending a corresponding fourth message processing logic to each second forwarding device on the standby user plane connection path, where the fourth message processing logic includes a source IP address or a destination IP address of data to be transmitted, an output port of the data to be transmitted, and a priority of the fourth message processing logic, and where the priority of the fourth message processing logic is higher than that of the first message processing logic on each second forwarding device or the common forwarding device; alternatively, the first and second liquid crystal display panels may be,

and sending a corresponding fifth message processing logic to each second forwarding device on the standby user plane connection path, and deleting all first message processing logics on the main user plane connection path or the first message processing logics of the public forwarding device, wherein the fifth message processing logic comprises a source IP address or a destination IP address of data to be transmitted, an output port of the data to be transmitted, and the priority of the fifth message processing logic.

Optionally, when sending a corresponding second packet processing logic to each first forwarding device on the primary user plane connection path and sending a corresponding third packet processing logic to each second forwarding device on the standby user plane connection path at the same time, switching the control data transmission path from the primary user plane connection path to the standby user plane connection path includes:

and deleting all the first message processing logics on the main user plane connection path or the first message processing logics of the public forwarding equipment.

Optionally, the method further comprises:

and operating the third message processing logic, the fourth message processing logic or the fifth message processing logic, and modifying the destination address of the data to be transmitted into an address which can enable receiving equipment to correctly receive the data.

The above embodiment can implement all the method steps of the above method embodiment, and can achieve the same technical effect, which is not described herein in detail.

Fig. 5 is a block diagram of a data transmission apparatus according to an embodiment of the present application, where the apparatus includes:

a determining module 501, configured to determine a main user plane connection path and a standby user plane connection path that are disjoint based on a main-standby relationship between a pre-deployed main receiving device and a pre-deployed standby receiving device;

a sending module 502, configured to send a corresponding first packet processing logic only to each first forwarding device on the primary user plane connection path, or send a corresponding second packet processing logic to each first forwarding device on the primary user plane connection path and send a corresponding third packet processing logic to each second forwarding device on the standby user plane connection path at the same time;

Optionally, the method further comprises:

and the control module is used for controlling a data transmission path to be switched from the main user plane connection path to the standby user plane connection path when detecting that the main user plane connection path has a fault.

Optionally, when sending the corresponding first packet processing logic only to each first forwarding device on the primary user plane connection path, the control module is specifically configured to:

Optionally, when sending a corresponding second packet processing logic to each first forwarding device on the primary user plane connection path and sending a corresponding third packet processing logic to each second forwarding device on the secondary user plane connection path at the same time, the control module is specifically configured to:

Optionally, the system further includes an operation module, configured to operate the third message processing logic, the fourth message processing logic, or the fifth message processing logic, and modify the destination address of the to-be-transmitted data into an address that enables a receiving device to correctly receive the data.

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

It should be noted that the apparatus provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

On the other hand, the embodiment of the present application further provides a processor-readable storage medium, where a computer program is stored, and the computer program is configured to enable the processor to execute the method described in the foregoing embodiment.

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.

As can be seen from the above embodiments, a processor-readable storage medium stores a computer program for causing the processor to execute the above-described method of data transmission.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method of data transmission, comprising:

2. The data transmission method according to claim 1,

and sending a corresponding first message processing logic to each first forwarding device, or simultaneously sending a corresponding second message processing logic to each first forwarding device and sending a corresponding third message processing logic to each second forwarding device, by using a Software Defined Network (SDN) controller.

3. The method according to claim 1, wherein the first message processing logic comprises a source IP address or a destination IP address of the data to be transmitted, an output port of the data to be transmitted, and a priority of the first message processing logic.

4. The data transmission method according to claim 1,

the third message processing logic includes a source IP address or a destination IP address of data to be transmitted, an output port of the data to be transmitted, and a priority of the third message processing logic, and on each of the second forwarding devices or the common forwarding device, the priority of the second message processing logic is higher than the priority of the third message processing logic.

5. The data transmission method according to claim 1, further comprising:

and when the main user plane connection path is detected to have a fault, controlling a data transmission path to be switched to the standby user plane connection path from the main user plane connection path.

6. The data transmission method according to claim 5, wherein when sending only the corresponding first packet processing logic to each first forwarding device on the primary user plane connection path,

the control data transmission path is switched from the main user plane connection path to the standby user plane connection path, and the control data transmission path comprises:

sending a corresponding fourth message processing logic to each second forwarding device on the standby user plane connection path, where the fourth message processing logic includes a source IP address or a destination IP address of data to be transmitted, an output port of the data to be transmitted, and a priority of the fourth message processing logic, and where the priority of the fourth message processing logic is higher than that of the first message processing logic on each second forwarding device or the common forwarding device; alternatively, the first and second electrodes may be,

7. The data transmission method according to claim 5, wherein when simultaneously sending a corresponding second packet processing logic to each first forwarding device on the primary user plane connection path and a corresponding third packet processing logic to each second forwarding device on the secondary user plane connection path,

the switching of the control data transmission path from the primary user plane connection path to the secondary user plane connection path includes:

8. The data transmission method according to any one of claims 1 to 7, further comprising:

and operating the third message processing logic, the fourth message processing logic or the fifth message processing logic, and modifying the destination address of the data to be transmitted into an address which can enable the receiving equipment to correctly receive the data.

9. An SMF, comprising a memory, a transceiver, a processor:

determining a main user plane connection path and a standby user plane connection path which are not intersected based on a main-standby relation between a main receiving device and a standby receiving device which are deployed in advance;

10. The SMF of claim 9,

11. The SMF of claim 9, wherein the first message processing logic comprises a source IP address or a destination IP address of the data to be transmitted, an output port of the data to be transmitted, and a priority of the first message processing logic.

12. The SMF of claim 9,

13. The SMF of claim 9, further comprising:

14. The SMF of claim 13, wherein when sending only the corresponding first message processing logic to each first forwarding device on the primary user-plane connection path,

15. The SMF of claim 13, wherein when simultaneously sending a corresponding second message processing logic to each first forwarding device on the primary user-plane connection path and a corresponding third message processing logic to each second forwarding device on the secondary user-plane connection path,

16. The SMF according to any of claims 9 to 15, further comprising:

17. A data transmission apparatus, comprising:

the determining module is used for determining a main user plane connection path and a standby user plane connection path which are not intersected based on a main-standby relation between a main receiving device and a standby receiving device which are deployed in advance by a Session Management Function (SMF);

18. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing a processor to perform the method of any of claims 1 to 8.