WO2022151420A1

WO2022151420A1 - Method, apparatus, and system for transmitting data packet

Info

Publication number: WO2022151420A1
Application number: PCT/CN2021/072304
Authority: WO
Inventors: 蒋成堃; 周汉
Original assignee: 华为技术有限公司
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2022-07-21
Also published as: CN116724545A

Abstract

Embodiments of the present application provide a method, apparatus, and system for transmitting a data packet. The method comprises: a session management function apparatus obtains serial number information and address information of a terminal device, the serial number information representing an order in which the terminal device receives a data packet; the session management function apparatus generates a forwarding rule according to the serial number information and the address information, and sends the forwarding rule to a user plane function apparatus; and the user plane function apparatus amends the destination address of the data packet according to the forwarding rule, and sends the data packet to a terminal device corresponding to the destination address, thereby finally achieving sequential forwarding of the data packet. By means of the method, after an industrial Ethernet and a cellular network of an Ethernet for Control Automation Technology (EtherCAT) are networked, the user plane function apparatus can forward, to a plurality of terminal devices according to the forwarding logic of the EtherCAT, a data packet sent by a master station device, and finally forwards the data packet to the master station device, thereby finishing the complete EtherCAT communication.

Description

Method, device and system for data packet transmission

technical field

The present application relates to the field of communications, and in particular, to a method, apparatus and system for data packet transmission.

Background technique

After the emergence of the concept of Industry 4.0, the demand for industrial intelligence in the entire industrial field has become more and more urgent. Industrial intelligence refers to: in the process of industrial production, industrial control equipment receives industrial production-related data (for example, temperature data or pressure data) from sensors deployed in various industrial links, analyzes and makes decisions based on this data, and generates The execution instruction is executed, and the execution instruction is sent to the industrial production equipment in the field. Through industrial intelligence, industrial production can optimize the allocation of industrial resources through industrial control equipment to improve enterprise efficiency. A key factor in realizing industrial intelligence is that industrial equipment can communicate efficiently and flexibly.

Ethernet for Control Automation Technology (EtherCAT), as a representative industrial Ethernet technology, can be applied in the industrial field to realize real-time and reliable real-time and reliable communication between industrial auxiliary equipment and master equipment. communication. For example, the master device may be a control device, and the slave device may be a field device.

The way of EtherCAT communication is as follows: Take the master station device communicating with the first auxiliary station device and the second auxiliary station device, and the first auxiliary station device and the second auxiliary station device only read the data in the data packet as an example, the master station device The data sent to the first auxiliary station equipment and the second auxiliary station equipment is encapsulated into an Ethernet type data packet, and the master station equipment sends the data packet to the first auxiliary station equipment according to the established order; when the first auxiliary station equipment After the station device reads the data from the data packet, the first auxiliary station device sends the data packet to the second auxiliary station device according to the predetermined order. When the second auxiliary station device reads the data from the data packet, , the second auxiliary station device sends the data packet to the master station device according to the predetermined sequence, so far, a complete EtherCAT communication is completed.

The fifth generation mobile communication system (5GS) has the characteristics of low delay, high bandwidth, and high reliability, and can be used as a feasible solution for industrial wireless communication. If 5GS is used in industrial communication to provide low-latency, highly reliable wireless communication, 5GS should be able to support the EtherCAT protocol to realize real-time and reliable wireless communication in industrial communication. After the existing 5GS is networked with the industrial Ethernet, the auxiliary station equipment is connected to the terminal equipment through a wired method, the main station equipment sends data packets to the terminal equipment through 5GS, and the terminal equipment sends data packets to the connected auxiliary station equipment. When all the auxiliary station equipment in the system after 5GS is networked with industrial Ethernet are connected by multiple terminal equipments, after the first terminal equipment receives data packets from the connected auxiliary station equipment, it cannot send data packets to the The auxiliary station equipment connected to the two terminal equipment sends the data packet, and the first terminal equipment sends the data packet to the master station through 5GS, so that the complete EtherCAT communication cannot be completed between the master station equipment and the auxiliary station equipment, that is, It is said that the communication method of EtherCAT cannot be supported after 5GS is currently networked with industrial Ethernet.

SUMMARY OF THE INVENTION

This application describes a method, apparatus and system for data packet transmission.

In a first aspect, an embodiment of the present application provides a data packet transmission method, and the method is executed by a user plane function device. The method includes: the user plane function device receives the forwarding rule from the session management function device; the user plane function device receives the first data packet of the Ethernet type from the master station device; the user plane function device sends the first data packet to the first terminal device; The user plane function device receives the second data packet associated with the first data packet from the first terminal device; the user plane function device modifies the destination address of the second data packet to the address of the second terminal device according to the forwarding rule, and obtains the third data packet packet; the user plane function device sends the third data packet to the second terminal device according to the forwarding rule. The first data packet may be the same as or different from the second data packet; the destination address in the third data packet is the address of the second terminal device. According to the above solution, when the industrial Ethernet of the Ethernet control automation technology EtherCAT is networked with the cellular network, the user plane function device can forward the data packets sent by the master station device to multiple terminal devices in turn according to the forwarding logic of EtherCAT. packet, and finally forward the data packet back to the master device to complete the complete EtherCAT communication.

For example, the forwarding sequence of the data packets between the first terminal device and the second terminal device in an EtherCAT communication link is in the order of the first terminal device and the second terminal device. The main station device first sends the first data packet of the Ethernet type to the first terminal device through the user plane function device, and after receiving the first data packet from the user plane function device, the first terminal device sends the first data packet to the user plane function device. For a data packet, the user plane function device modifies the destination address in the data packet received from the first terminal device to the address of the second terminal device to obtain the second data packet, that is to say, the destination address in the second data packet is the first data packet. address of the second terminal device, and then send the second data packet to the second terminal device. After receiving the second data packet, the second terminal device sends the second data packet to the user plane function device.

In a possible implementation manner, the method further includes: the user plane function device receives a fourth data packet from the third terminal device; and the user plane function device sends a fifth data packet associated with the fourth data packet to the master station device. The third terminal device may be the second terminal device, or the third terminal device may be other terminal devices except the first terminal device and the second terminal device.

For example, when the third terminal device is the second terminal device, after receiving the fourth data packet from the second terminal device, the user plane function device modifies the destination address in the fourth data packet to the address of the master station device to obtain the destination address A fifth data packet of the address of the master station equipment, and then the user plane function device sends the fifth data packet to the master station equipment.

In a possible implementation manner, the method further includes: the user plane function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, the first The serial number information of the terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device are used for generating the forwarding rule. That is to say, the forwarding rule is generated according to the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, and the forwarding rule can be generated by the session management function device .

In a possible implementation manner, the user plane function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, including: The master station device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device. The way that the user plane function device obtains the above information from the main station device can be mailbox communication. In this way, the main station device does not need to additionally configure the interface with the application function device to transmit information, so this method reduces the need for the main station device. Changes to station equipment and application functionality.

Or, in a possible implementation manner, the user plane function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, including: the user plane function The device obtains the serial number information of the first terminal device and the address of the first terminal device from the first terminal device; the user plane function device obtains the serial number information of the second terminal device and the address of the second terminal device from the second terminal device. That is, the user plane function device obtains the terminal device serial number information and the terminal device address from the terminal device, and the terminal device can send the terminal device serial number information and the terminal device address to the user plane function device by means of mailbox communication.

In a possible implementation manner, the method further includes: the user plane function device sends the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the second terminal device to the session management function device. the address of. In this manner, the session management function device generates a forwarding rule according to the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device received from the user plane function device.

In a possible implementation manner, the forwarding rule includes the serial number information of the first terminal device, the address of the first terminal device, the serial number information of the second terminal device, and the address of the second terminal device. The forwarding rule is used for the user plane function device to forward data packets to the first terminal device and the second terminal device in sequence.

In a possible implementation manner, the user plane function device modifies the destination address of the second data packet to the address of the second terminal device according to the forwarding rule, including: the user plane function device determines according to the forwarding rule to send the second data packet to the second terminal device. For the data in the data packet, the user plane function device modifies the destination address of the second data packet to the address of the second terminal device.

In a second aspect, an embodiment of the present application provides a data packet transmission method, and the method is executed by a session management function device. The method includes: the session management function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device; information, the serial number information of the second terminal device, the address of the first terminal device, and the address of the second terminal device to generate a forwarding rule, and the forwarding rule is used to modify the destination address of the first data packet; the session management function device reports to the user plane function device Send forwarding rules. According to the above solution, when the industrial Ethernet of EtherCAT is networked with the cellular network, the user plane function device can, according to the forwarding rules generated by the session management function device in this aspect, forward the data packets sent by the master station to the forwarding logic according to the EtherCAT forwarding logic. The terminal device forwards the data packet, and finally forwards the data packet back to the master station to complete the complete EtherCAT communication.

In a possible implementation manner, the session management function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, including: The user plane function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device from the master station device.

Or, in a possible implementation manner, the session management function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, including:

The session management function device obtains the serial number information of the first terminal device and the address of the first terminal device from the first terminal device through the user plane function device, and obtains the serial number information of the second terminal device and the address of the second terminal device from the second terminal device. .

In a possible implementation manner, the method further includes: the session management function device sends the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the second terminal device to the unified data management device. , the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device are used for the creation of the virtual network group, or the serial number information of the first terminal device , the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device are used to update the virtual network group, and the virtual network group includes the first terminal device and the second terminal device.

In a possible implementation, the session management function device sends the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device to the unified data management device, including: The session management function device sends the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device to the unified data management device through the application function device.

In a possible implementation manner, the session management function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, including: The unified data management apparatus acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device.

In a possible implementation manner, the forwarding rule includes serial number information of the first terminal device, serial number information of the second terminal device, an address of the first terminal device, and an address of the second terminal device.

In a third aspect, an embodiment of the present application provides a data packet transmission method, which is executed by a terminal device. The method includes: the first terminal device receives policy information; the first terminal device receives the first data packet of the Ethernet type; the first terminal device modifies, according to the policy information, the destination address in the first data packet to the address of the second terminal device, The second data packet is obtained; the first terminal device sends the second data packet to the second terminal device. According to the above solution, after the EtherCAT industrial Ethernet and the cellular network are networked, the first terminal device can modify the destination address of the EtherCAT type data packet to the address of the second terminal device according to the policy information, and forward the destination to the second terminal device. The EtherCAT type data packet whose address is the second terminal device completes the complete EtherCAT communication according to the EtherCAT forwarding logic through the device-to-device D2D communication method.

In a possible implementation manner, the first terminal device receiving the policy information includes: the first terminal device receiving the policy information from the application function device.

In a possible implementation manner, sending the second data packet by the first terminal device to the second terminal device includes: the first terminal device sending the second data packet to the second terminal device through the user plane function device. That is to say, when the first terminal device and the second terminal device are in the same virtual network group, the first terminal device may also forward the EtherCAT type data packet to the user plane function device, wherein the EtherCAT type data packet has a The destination address is the address of the second terminal device, the source address is the address of the first terminal device, and the user plane function device forwards the EtherCAT type data packet to the second terminal device.

In a possible implementation manner, the policy information includes the address of the second terminal device. That is, the first terminal device modifies the destination address of the EtherCAT type data packet to the address of the second terminal device according to the address of the second terminal device in the policy information.

In a fourth aspect, an embodiment of the present application provides a data packet transmission method, and the method is executed by an application function device. The method includes: the application function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device; the application function device obtains the serial number information of the first terminal device, The serial number information of the second terminal device, the identifier of the first terminal device, and the identifier of the second terminal device are used to create or update the virtual network group by calling the interface of the network open function device and calling the unified data management device. According to the above solution, the application function device creates a virtual network group for the first terminal device and the second terminal device, and the first terminal device and the second terminal device in the virtual network group have serial number information, and the serial number information is used to indicate the first terminal device and the second terminal device. The sequence of a terminal device and a second terminal device in the forwarding logic of EtherCAT, and the sequential forwarding of EtherCAT type data packets can be implemented by using the forwarding mode of the fifth-generation communication local area network 5GLAN.

In a possible implementation manner, the application function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device, including: the application function device obtains the serial number information from the main station. The device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device, and the identifier of the second terminal device.

In a possible implementation manner, the application function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device, and the identifier of the second terminal device, including: the application function device obtains information from the session management The apparatus acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device.

In a fifth aspect, an embodiment of the present application provides a data packet transmission method, and the method is executed by a unified data management apparatus. The method includes: the unified data management device obtains serial number information of the first terminal device, serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device; the unified data management device obtains the serial number of the first terminal device according to the serial number of the first terminal device. information, the serial number information of the second terminal device, the identifier of the first terminal device, and the identifier of the second terminal device to create a virtual network group; or, the unified data management apparatus creates a virtual network group according to the serial number information of the first terminal device and the serial number of the second terminal device The information, the identity of the first terminal device and the identity of the second terminal device update the information of the virtual network group. According to the above solution, the unified data management device creates a virtual network group for a plurality of terminal devices that can perform packet forwarding according to the forwarding logic of EtherCAT, and the information in the virtual network group can be used for the generation of forwarding rules, and when the system implements The forwarding mode of 5G LAN can be used when forwarding data packets according to the forwarding logic of EtherCAT.

In a possible implementation manner, the unified data management apparatus acquires the serial number information of the first terminal equipment, the serial number information of the second terminal equipment, the identifier of the first terminal equipment and the identifier of the second terminal equipment, including: The session management function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device.

In a possible implementation manner, the unified data management apparatus acquires the serial number information of the first terminal equipment, the serial number information of the second terminal equipment, the identifier of the first terminal equipment and the identifier of the second terminal equipment, including: The application function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device.

In a sixth aspect, an embodiment of the present application provides a data packet transmission method, and the method is executed by an application function device. The method includes: the application function device obtains the serial number information of the first terminal device and the serial number information of the second terminal device; the application function device sends the serial number information of the first terminal device and the serial number information of the second terminal device to the master station device, the first terminal device. The serial number information of the terminal device and the serial number information of the second terminal device are used for the maintenance of the serial number information. According to the above solution, the master station device obtains from the application function device the serial number information of the first terminal device and the second terminal device that can perform data packet forwarding according to the EtherCAT forwarding logic. After obtaining the above information, the master station device can If necessary, modify the sequence number information and re-formulate the forwarding sequence of data packets in the forwarding logic of EtherCAT.

In a possible implementation manner, the application function device obtains the serial number information of the first terminal device and the serial number information of the second terminal device, including: the application function device obtains the serial number information of the first terminal device and the second terminal device from the session management function device. Serial number information of the device.

In a possible implementation manner, the application function device obtains the serial number information of the first terminal device and the serial number information of the second terminal device, including: the application function device obtains the serial number information of the first terminal device and the second terminal device from the unified data management device. Serial number information of the device.

In a seventh aspect, an embodiment of the present application provides a communication device, including a processor, where the processor is configured to read and run a program from a memory, so as to implement the method of the foregoing first aspect or any possible implementation manner, Alternatively, to implement a method as in the second aspect above or any possible embodiment, or, to implement a method as in the third aspect or any possible embodiment above, or, to implement a method as in the fourth aspect or any of the foregoing The method of a possible embodiment, alternatively, to implement the method as the fifth aspect or any of the possible embodiments above, or to implement the method as the sixth aspect or any of the possible embodiments.

In an eighth aspect, the embodiments of the present application provide a communication system, including a user plane function device and a session management function device, the user plane function device can execute the method of the first aspect or any possible implementation manner, and the session management function device The functional means may perform the method of the second aspect or any possible embodiment.

In a ninth aspect, embodiments of the present application provide a communication system, including a user plane function device and a terminal device, where the terminal device can execute the method of the third aspect or any possible implementation manner.

In a tenth aspect, embodiments of the present application provide a communication system, including an application function device and a unified data management device, where the application function device can execute the method of the fourth aspect or any possible implementation manner, and the unified data management device The method of the fifth aspect or any possible embodiment may be performed.

In an eleventh aspect, the embodiments of the present application provide a computer program product comprising instructions, which, when run on a computer, cause the computer to perform the method of the first aspect or any possible implementation manner, or the second aspect or the method of any possible embodiment, or the third aspect or the method of any possible embodiment, or the fourth aspect or any possible embodiment, or the fifth aspect or any possible embodiment The method, or the method of the sixth aspect or any possible embodiment.

In a twelfth aspect, embodiments of the present application provide a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, cause a processor to execute the first aspect or any possible or the method of the second aspect or any possible embodiment, or the method of the third aspect or any possible embodiment, or the method of the fourth aspect or any possible embodiment, or the method of the fourth aspect or any possible embodiment The method of the fifth aspect or any possible embodiment, or the method of the sixth aspect or any possible embodiment.

Description of drawings

Figure 1 is a schematic diagram of a data transmission path of EtherCAT;

Figure 2 is a schematic diagram of a 5GS architecture based on a service-oriented interface;

3A is a schematic diagram of an industrial communication system integrating 5GS and EtherCAT;

3B is a schematic diagram of the forwarding logic of EtherCAT in an industrial communication system integrating 5GS and EtherCAT;

Figure 4 is a connection method between 5GS and EtherCAT industrial communication system;

FIG. 5 is a schematic diagram of flow interaction of a data packet forwarding provided according to an embodiment of the present application;

FIG. 6 is a schematic diagram of flow interaction of another data packet forwarding provided according to an embodiment of the present application;

7 is a schematic diagram of another flow interaction of data packet forwarding provided according to an embodiment of the present application;

FIG. 8 is a schematic diagram of another flow interaction of data packet forwarding provided according to an embodiment of the present application;

9 is a schematic diagram of another flow interaction of data packet forwarding provided according to an embodiment of the present application;

10 is a schematic diagram of another flow interaction of data packet forwarding provided according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a communication device provided according to an embodiment of the present application;

FIG. 12 is a schematic diagram of another communication apparatus provided according to an embodiment of the present application.

Detailed ways

Ethernet for Control Automation Technology (EtherCAT) provides an Ethernet-based fieldbus system. Compared with traditional bus systems, EtherCAT is widely used in the field of industrial automation because it uses standard Ethernet hardware, which greatly reduces costs for enterprises.

Industrial communication networks usually use the master-slave communication mode for communication, that is, the mode in which data is sent to the auxiliary station equipment through the master station equipment. For example, the master station equipment is the controller, which is used to configure the subordinate equipment, collect and analyze the subordinate auxiliary station equipment. information, to issue instructions to auxiliary station equipment, such as instructions to measure temperature; and auxiliary station equipment is Input/Output (I/O) equipment, such as sensor equipment, drive equipment or motor equipment, auxiliary station equipment Actions are performed according to the requirements of the master device. Since the data communicated between each auxiliary station device and the master station device in the industrial communication network is small, the master station device sends an Ethernet type data packet to each auxiliary station device, which will result in low bandwidth utilization of the industrial communication system. , the network performance is degraded. EtherCAT assembles the data transmitted to the auxiliary station equipment into a total Ethernet type data packet in the form of corresponding sub-packets through the master station equipment, and transmits the data packet to all auxiliary station equipment in turn to improve bandwidth utilization. , thus improving network performance. Each auxiliary station device uses the "processing on the fly" technology to quickly process the data of the sub-message corresponding to its own auxiliary station device in the above-mentioned Ethernet type data packet, and sends the processing to the next auxiliary station device. after the packet.

FIG. 1 is a schematic diagram of a data transmission path of EtherCAT. It is assumed that the industrial communication system includes one master station device and four auxiliary station devices, which are the master station device, the auxiliary station device 1, the auxiliary station device 2, the auxiliary station device 3 and the auxiliary station device 4, respectively. The arrow in the figure indicates the forwarding logic of EtherCAT: the master station device sends an EtherCAT type data packet, and the data packet is received by the auxiliary station device 1, the auxiliary station device 2, the auxiliary station device 3 and the auxiliary station device 4 in turn. And finally the data packet is sent by the auxiliary station device 4 to the master station device. For example, the master station device sends different control commands to all the auxiliary station devices, the master station device generates four sub-messages, the date in the first sub-message is the control command that the master station device wants to inform the auxiliary station device 1, The date in the second sub-message is the control command that the master station device wants to inform the slave station device 2, and so on. The master station encapsulates the four sub-packets into an EtherCAT type data packet. The primary station sends the data packet to the secondary station device 1. After receiving the data packet, the auxiliary station device 1 reads the control instruction provided to itself (auxiliary station device 1) in the data packet, and sends the data packet to the auxiliary station device 2 according to the forwarding logic. Similarly, the auxiliary station device 2 After receiving the data packet, read the control instruction provided to itself (auxiliary station equipment 2) in the data packet, and send the data packet to the auxiliary station equipment 3 according to the forwarding logic. For example, the auxiliary station equipment 2 passes the auxiliary station equipment. Device 1 sends the data packet to secondary station device 3. And so on, until the auxiliary station device 4 sends the data packet to the main station device according to the forwarding logic after reading the control instruction provided to itself (auxiliary station device 4) in the data packet, for example, the auxiliary station device 4 passes through The secondary station device 3 and the secondary station device 1 send the data packet to the primary station device. The master station device receives the data packet from the slave station device 4, and one EtherCAT communication is completed.

The industrial field has high requirements on the delay, bandwidth and reliability of communication. Since the previous wireless communication technology cannot match the needs of the industrial field, the application of wireless communication in the industrial field is limited. With the continuous development of communication technology, the fifth generation mobile communication system (5GS) came into being. Due to its characteristics of low delay, high bandwidth and high reliability, 5GS can be used as a feasible way of industrial wireless communication. Program. Figure 2 is a schematic diagram of a 5GS architecture based on a service-oriented interface. The network architecture includes three parts, namely terminal equipment, access network ((radio)access network, (R)AN) and core network.

The parts involved in the network architecture will be described in detail below.

A terminal device is a device with wireless transceiver function. The terminal equipment is wirelessly connected to the access network equipment so as to be connected to the communication system. A terminal device may also be referred to as a terminal, user equipment (UE), a mobile station, a mobile terminal, and the like. The terminal equipment can be mobile phone, tablet computer, computer with wireless transceiver function, virtual reality terminal equipment, augmented reality terminal equipment, wireless terminal in industrial control, wireless terminal in unmanned driving, wireless terminal in remote surgery, smart grid Wireless terminals in smart cities, wireless terminals in transportation security, wireless terminals in smart cities, or wireless terminals in smart homes, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device. As an example and not a limitation, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. Wait. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring. The terminal device may also be an on-board module, on-board component, on-board chip or on-board unit built into the vehicle as one or more components or units, and the vehicle passes the built-in on-board module, on-board module, on-board component, on-board chip or on-board unit. A unit may implement the methods of the present application.

(R)AN is used to implement wireless related functions. A node in the (R)AN may also be called an access network device or a base station, and is used to access the terminal device to the wireless network. The access network device may be a base station (base station), an LTE system or an evolved base station (evolved NodeB, eNodeB) in an LTE system (LTE-Advanced, LTE-A), a next-generation base station in a 5G communication system (next generation NodeB, gNB), transmission reception point (TRP), base band unit (BBU), WiFi access point (access point, AP), base station or WiFi system in future mobile communication systems access node etc. The radio access network device may also be a module or unit that completes some functions of the base station, for example, may be a centralized unit (central unit, CU) or a distributed unit (distributed unit, DU). The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For example, in a network structure, the radio access network device may be a CU node, or a DU node, or an access network device including a CU node and a DU node. Specifically, the CU node is used to support radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP), service data adaptation protocol (service data adaptation protocol, SDAP) and other protocols; DU node Used to support the radio link control (radio link control, RLC) layer protocol, medium access control (medium access control, MAC) layer protocol and physical layer protocol.

The core network network may include one or more of the following network elements: a unified data management (unified data management, UDM) network element, an application function (application function, AF) network element, a policy control function (Policy Control Function, PCF) network element element, Network Exposure Function (NEF) network element, access and mobility management function (AMF) network element, session management function (SMF) network element, user plane function (user plane function, UPF) network element, etc. The above network elements may also be referred to as devices, equipment or entities, which are not limited in this application. For example, UDM network elements may also be referred to as UDM devices, UDM equipment or UDM entities. For ease of description, the following will be performed in abbreviated manner, for example, "UDM network element" is abbreviated as "UDM", and "SMF network element" is abbreviated as "SMF".

The UDM is used to manage the subscription data, and to notify the corresponding network elements when the subscription data is modified, and to manage group information.

AF is used to provide application layer services to terminal devices. AF interacts with other control network elements on behalf of applications, including providing quality of service (QoS) requirements, charging policy requirements, and routing policy requirements.

PCF is used for the generation of terminal equipment access policies and QoS control policies.

NEF is used to provide the openness of 5G network capabilities and events, and to receive relevant external information.

AMF is used to be responsible for user mobility management. For example, mobility management includes mobility status management, assigning user temporary identities, authenticating and authorizing users, etc.

SMF is used for selection and reselection of UPF, network protocol (IP) address allocation, protocol data unit (protocol data unit, PDU) session establishment, modification or release, etc.

UPF is interconnected with a data network (DN) for packet detection, routing and forwarding. For example, the UPF can be used as an uplink classifier (ULCL) to support traffic offloading and then forwarded to the data network, or the UPF can be used as a branching point (BP) to support multi-homed PDU sessions.

The above-mentioned network elements can be implemented by specified hardware, or by a software instance on specified hardware, or by a virtual function instantiated on a suitable platform, which is not limited in this application. .

Figure 3A is a schematic diagram of an industrial communication system that integrates 5GS and EtherCAT. In order to realize the communication function between the main station equipment and the auxiliary station equipment, reduce the deployment of physical connection lines between the main station equipment and the auxiliary station equipment, and increase the flexibility of communication , 5GS is used for communication between the main station equipment and the auxiliary station equipment. As shown in Figure 3A, the main station equipment is connected to the 5GS, and the connection method can be referred to as shown in Figure 4. For example, the main station equipment is connected to the AF in the 5GS. The auxiliary station equipment is connected to the terminal equipment in the 5GS. For example, the terminal equipment A is connected to the auxiliary station equipment 1 and the auxiliary station equipment 2 in sequence, and the terminal equipment B is connected to the auxiliary station equipment 3 and the auxiliary station equipment 4 in sequence. In the current industrial communication system that integrates 5GS and EtherCAT, the master station device can only communicate with terminal device A or terminal device B alone. That is to say, the master station device sends an EtherCAT type data packet to the auxiliary station device 1 through the terminal device A. After the data packet is forwarded to the auxiliary station device 2 in sequence, it finally returns to the terminal device A, and is sent by the terminal device A. Send a packet to the master device. However, the 5GS should implement the forwarding of data packets according to the forwarding logic of EtherCAT, that is, implement the forwarding of data packets according to the forwarding logic of EtherCAT as shown by the arrow in FIG. 3B . Therefore, if the prior art is adopted, the data packet cannot be forwarded to the auxiliary station equipment 3 and the auxiliary station equipment 4 in sequence, and finally returns to the main station equipment.

The problem to be solved in this application is how to make the industrial communication system integrated with 5GS and EtherCAT support the forwarding logic of EtherCAT to realize data packet forwarding.

5G local area network (5G LAN) technology is a technology that realizes local area network communication through the 5G core network. Multiple terminal devices with communication requirements form a virtual network group. communication between end devices. The establishment of the virtual network group needs to be performed by the AF. NEF provides a set of services to the AF to support the dynamic management of the virtual network group of the 5G LAN, including the addition, deletion or modification of terminal device members in the virtual network group. . 5G LAN allows peer-to-peer communication, broadcast or multicast communication based on Ethernet (Ethernet) or Internet Protocol (IP) between members in a virtual network group. It should be pointed out that the 5G LAN in the prior art also does not support the terminal device members in the group to implement communication according to the aforementioned EtherCAT forwarding sequence.

Figure 4 shows a connection method between 5GS and EtherCAT industrial communication system. As shown in Figure 4, 5GS can be simulated as a special EtherCAT auxiliary station equipment node (5GS as a Secondary) with multiple ports. The main station equipment is connected to the network devices in the 5GS. For example, the main station equipment can be connected to the AF in the 5GS, or it can be connected to the UPF in the 5GS, and the auxiliary station equipment is connected to multiple terminal equipment in the 5GS. station equipment is connected. The entire 5GS can be regarded as the auxiliary station equipment 1 in Figure 1, that is, the 5GS is connected to the main station equipment and the auxiliary station equipment at the same time. Therefore, the master station equipment and the auxiliary station equipment can realize the transmission of information through 5GS. For example, the master station equipment sends information to the terminal equipment through the AF, PCF, SMF and AMF in the 5GS in sequence, and the terminal equipment sends the information to the auxiliary station equipment. For another example, the secondary station equipment may send information to the primary station equipment through the terminal equipment, the RAN, the UPF, the SMF, the PCF, and the AF in sequence.

In this application, 5GS can be regarded as a special auxiliary station equipment node with multiple ports, and a virtual network group is created for the terminal equipment connected to the auxiliary station equipment, and the terminal equipment in the virtual network group has a serial number identifier, The sequential forwarding of the data packets can be implemented according to the sequence number identification. Through the method of the present application, it can be realized that the data packets sent by the master station equipment to the auxiliary station equipment can pass through 5GS, according to the forwarding logic of EtherCAT, be received in sequence by all the auxiliary station equipment connected through the terminal equipment, and finally return to the master station equipment, complete A complete EtherCAT communication.

FIG. 5 is a schematic diagram of flow interaction of data packet forwarding according to an embodiment of the present application. This embodiment includes the following steps:

Step 501, the master station device sends information of multiple terminal devices to the AF. The information of each terminal device includes the address of the terminal device, the identification information of the terminal device, and the serial number identification of the terminal device. For example, the address of the terminal device is a media access control (Media Access Control, MAC) address of the terminal device. The sequence number identifier of the terminal device represents the forwarding sequence of the data packet among multiple terminal devices. Optionally, the master station device sends the identifier of the Ethernet type to the AF.

For example, the information of multiple terminal devices sent by the master station device to the AF includes information of two terminal devices. For example, the identification information of the terminal equipment is A and B, respectively. The serial number identifiers of the terminal equipment are number 1 and number 2, where the number 1 represents that terminal device A is the first terminal device to receive data packets, and the number 2 represents that terminal device B is the second to receive data packets. terminal equipment.

For example, a customized application programming interface (Application Programming Interface, API) is established between the master station device and the AF, and the master station device sends the information of the terminal device to the AF through the API.

For example, a network description file is stored in the master station device, and the network description file contains information of the terminal device. The network description file can be sent to the AF in an offline manner (eg, offline copy).

Step 502, the AF invokes the interface opened by the NEF according to the received information of the terminal device, and the NEF invokes the UDM to create a virtual network group for the terminal device.

For example, AF creates a virtual network group for terminal device A and terminal device B.

For example, the information of the virtual network group is stored in a data storage device (not shown in the figure) by the UDM, for example, a unified data storage (Unified Data Repository, UDR) device. For example, the information of the virtual network group includes the identification information of the terminal device, the serial number identification of the terminal device, the address of the terminal device, and the group identification information of the virtual network group.

Step 503, the SMF obtains the information of the virtual network group from the UDM. For example, the address of the terminal device, the identification information of the terminal device, the serial number identification of the terminal device, and the group identification information of the virtual network group.

For example, the SMF obtains the information of the virtual network group from the UDR through the UDM.

Step 504, the SMF generates a forwarding rule and a data packet detection rule according to the information of the virtual network group in step 503.

For example, the data packet detection rule is used for UPF to detect the EtherCAT type data packet. The data packet detection rule is used by UPF to detect the data packets received from the terminal equipment in the virtual network group according to the data packet detection rule. The data packet detection rule can also be used by UPF to detect the master station according to the data packet detection rule Data packets sent by the device to the terminal devices in the virtual network group.

For example, a packet filter set (Packet filter Set) is defined in the packet inspection rule, and the information in the packet filter set includes the MAC address information of the terminal device in the virtual network group, the Ethernet type value (for example, 88A4h) or the virtual network Group identification information for the group. UPF can identify the EtherCAT type data packet according to the Ether type value, or can also identify the EtherCAT type data packet according to the MAC address information of the terminal device in the virtual network group, or can identify the EtherCAT type data packet according to the group identification information. EtherCAT type packets.

For example, the forwarding rule is used for the UPF to send the EtherCAT type data packet to the terminal device. The forwarding rule is used by the UPF to modify the source address and destination address of the received EtherCAT type data packet, and forward the EtherCAT type data packet to the next terminal device.

The forwarding rule can be as shown in Table 1:

Table 1 Forwarding rules

序号serial number	地址address
11	终端设备A的地址Address of terminal device A
22	终端设备B的地址Address of terminal device B

If UPF receives the EtherCAT type data packet from terminal device A, when UPF determines that terminal device A corresponds to serial number 1 according to the serial number in Table 1, and then finds the address corresponding to serial number 2, that is, the address of terminal device B, so UPF It is determined that the EtherCAT type data packet should be sent to terminal device B, and the UPF changes the source address of the EtherCAT type data packet to the address of the master device, and the destination address of the EtherCAT type data packet to terminal device B. the address of.

Or, optionally, the forwarding rule can also be as shown in Table 2:

Table 2 Forwarding rules

EtherCAT类型的数据包的来源Source of EtherCAT type packets	源地址source address	目的地址Destination address
主站设备master equipment	主站设备的地址Address of the master device	终端设备A的地址Address of terminal device A
终端设备ATerminal equipment A	终端设备A的地址Address of terminal device A	终端设备B的地址Address of terminal device B
终端设备BTerminal equipment B	终端设备B的地址Address of terminal device B	主站设备的地址Address of the master device

Similarly, if the UPF receives the EtherCAT type data packet from the terminal device A, when the UPF determines that the source address in the EtherCAT type data packet should be modified according to the "source of the EtherCAT type data packet" information in Table 2 The address of the master device, modify the destination address of the EtherCAT type data packet to the address of the terminal device B.

Step 505, the SMF sends the forwarding rule and the data packet inspection rule to the UPF. For example, the SMF sends the above-mentioned forwarding rules and data packet inspection rules to the UPF through a message requesting to establish or modify an N4 session.

Step 506, after receiving the forwarding rule and the data packet inspection rule, the UPF sends a response message to the SMF. For example, the UPF sends a response message to the SMF to establish or modify the N4 session.

In addition, the network side may also perform other steps for establishing a session between the UPF and the terminal device A, so that the establishment of the session between the UPF and the terminal device A is completed. Similarly, the network side may also perform other steps for establishing a session between the UPF and the terminal device B, so that the establishment of the session between the UPF and the terminal device B is completed.

Step 507, the SMF sends a session establishment complete response message to the AF.

Step 508: After receiving the session establishment completion response information, the AF sends notification information to the master station device. The notification information is used to notify the master station device that the session establishment is completed and data packets can be sent to the terminal device.

Step 509, the master station device sends the EtherCAT type data packet to the terminal device A through the UPF in the 5GS. For example, the master station device sends the EtherCAT type data packet to the terminal device through the UPF and (R)AN (not shown in the figure) in the 5GS in turn.

For example, the source address information of the EtherCAT type data packet is the address of the main station device, and the destination address information of the EtherCAT type data packet is the address of the terminal device A (the serial number is identified as number 1), for example, the address information is the MAC address. .

For example, when the UPF receives the EtherCAT type data packet, it detects the EtherCAT type data packet according to the data packet detection rule, and sends the EtherCAT type data packet to the terminal device A according to the forwarding rule. Optionally, the group identification information of the virtual network group may also be used by the UPF to detect the EtherCAT type data packet.

Step 510, the terminal device A identifies the EtherCAT type data packet and forwards it to the auxiliary station device.

For example, the end device identifies packets of this EtherCAT type based on the EtherType value (eg, 88A4h).

The terminal device is connected to multiple auxiliary station devices, for example, the terminal device is connected to multiple auxiliary station devices in a wired manner. The terminal device forwards the EtherCAT type data packet to multiple auxiliary station devices, and the multiple auxiliary station devices forward the EtherCAT type data packet according to the set forwarding order, and finally the terminal device receives it according to the forwarding order of the multiple auxiliary station devices. The EtherCAT type data packet after forwarding is completed. The data part of the data packet received by the terminal device may be the same as the data part of the data packet sent by the terminal device. At this time, multiple auxiliary station devices have not changed the data part of the EtherCAT type data packet; The data part of the data packet sent by the terminal device is different. At this time, multiple auxiliary station devices may modify the data part of the EtherCAT type data packet, or add new data to the data part of the EtherCAT type data packet. , which is not limited in this application.

Step 511, the terminal device A sends to the UPF the EtherCAT type data packets that have been forwarded according to the forwarding sequence of the multiple auxiliary station devices.

The first optional implementation manner, the terminal device is terminal device A, the terminal device obtains the EtherCAT type data packet after the forwarding is completed according to the forwarding order of multiple auxiliary station devices, and terminal device A includes the EtherCAT type data packet in the data packet of the EtherCAT type. Exchange the source address and destination address of the EtherCAT type data packet, that is, terminal device A changes the destination address in the EtherCAT type data packet to the address of the master device, and terminal device A changes the source address in the EtherCAT type data packet to the terminal device. The address of device A. The end device sends the EtherCAT type data packet to the UPF.

In the second optional implementation manner, the terminal device is terminal device A, the terminal device obtains the EtherCAT type data packets that have been forwarded according to the forwarding order of multiple auxiliary station devices, and the terminal device directly sends the EtherCAT type data packets to the UPF. , at this time, the source address in the EtherCAT type data packet is still the address of the main station device, and the destination address is still the address of the terminal device A.

The third optional implementation manner, the terminal device is terminal device A, the terminal device obtains the EtherCAT type data packet after the forwarding is completed according to the forwarding order of multiple auxiliary station devices, and terminal device A includes the EtherCAT type data packet in the data packet of the EtherCAT type. The destination address is modified to the address of terminal device B, and terminal device A modifies the source address in the EtherCAT type data packet to the address of terminal device A. The terminal device sends the EtherCAT type data packet to the UPF. At this time, the forwarding of the data packet can use the forwarding mode of the 5G LAN, and the UPF directly sends the data packet to the terminal device B through the internal interface. The premise of this embodiment is that the terminal equipment in the communication has obtained the information on which terminal equipment it should forward the data packet to. Shows).

Step 512, the UPF determines and changes the destination address and source address of the current EtherCAT type data packet.

For example, after receiving the data packet, UPF detects the data packet according to the data packet detection rules, and judges that the EtherCAT type data packet should be sent to terminal device B according to the forwarding rules in step 504. In the first and second optional implementations, the UPF modifies the source address in the EtherCAT type data packet to the address of the master station device, and modifies the destination address in the EtherCAT type data packet to the address of the terminal device B. Address, if the third optional implementation manner is adopted in step 511, the destination address in the EtherCAT type data packet does not need to be modified. Then, the sending of the EtherCAT type data packet to the terminal device B is performed.

Step 513, the UPF sends the EtherCAT type data packet to the terminal device B.

Step 514, the terminal device B identifies the EtherCAT type data packet and forwards it to the auxiliary station device.

For example, the operation of the terminal device B is similar to the operation of the terminal device A in step 510, and reference may be made to the description of step 510, and details are not repeated here.

Step 515, the terminal device B sends to the UPF the EtherCAT type data packets that have been forwarded according to the forwarding sequence of the multiple secondary station devices.

Step 516, the UPF determines and changes the destination address and source address of the current EtherCAT type data packet.

For example, UPF determines that the EtherCAT type data packet should be sent to the master station device according to the data packet detection rules. UPF changes the destination address of the current EtherCAT type data packet according to the detection rules. The address of the master station device, the source address is the terminal device B Similarly, if in step 515, the destination address of the EtherCAT type data packet received by UPF from the terminal device is the main station device and the source address is the terminal device B, then UPF does not need to change the purpose of the current data packet in this step. address and source address.

Step 517, the UPF sends the EtherCAT type data packet to the master device. So far, a complete EtherCAT type packet forwarding process is completed.

It should be particularly noted that this solution is also applicable to the solution that does not create a virtual network group for terminal devices, that is, the master station sends the information of the terminal device to the AF, and the AF can send the information of the terminal device to the SMF through the service interface, and the SMF Generate data packet detection rules and forwarding rules according to the information of the terminal device. For the generation of the data packet detection rules and forwarding rules, reference may be made to the description of step 504 in this embodiment, and the methods in steps 506 to 517 in this embodiment are also used subsequently. , to complete the complete EtherCAT type data packet forwarding process, but in this solution, step 511 and step 515 adopt the first or second optional implementation manner.

In addition, when the information of the terminal device changes, if the UDM in the core network has created a virtual network group for the terminal device, the master device can call the UDM through the AF to call the interface opened by the NEF to realize the information in the virtual network group. The SMF updates the forwarding rules according to the information in the virtual network group updated by the UDM, and sends it to the UPF; if there is no virtual network group created for the terminal device in the core network, the master station device sends the update to the SMF through the AF. information of the new terminal device, the SMF updates the forwarding rule according to the information of the new terminal device, and sends it to the UPF.

In this embodiment, the UPF determines, according to the forwarding rule, to send the EtherCAT type data packet to the terminal device identified by the next sequence number, modifies the destination address of the EtherCAT type data packet to the address of the terminal device identified by the next sequence number, and executes The forwarding of data packets finally realizes a complete EtherCAT communication. Through this embodiment, when the 5GS and the industrial Ethernet are networked, the industrial Ethernet can realize that the networked industrial Ethernet system supports the EtherCAT communication mode through the 5GS, that is, the industrial communication system integrated with 5GS and EtherCAT is forwarded according to EtherCAT The logic completes the forwarding of EtherCAT type packets.

FIG. 6 is a schematic diagram of another flow interaction of data packet forwarding according to an embodiment of the present application.

The difference between this embodiment and the embodiment shown in FIG. 5 is that the 5GS obtains the information of the terminal device from the master station device in a different manner. This embodiment includes the following steps:

Step 601, the master station device obtains the auxiliary station device information (EtherCAT Secondary Information, ESI) file of the 5GS and the auxiliary station device offline, and generates an EtherCAT Network Information (EtherCAT Network Information, ENI) file.

For example, the offline method is a mobile hard disk copy method, and the factory staff stores the ESI files of the 5GS and the auxiliary station equipment in the main station equipment.

For example, the ESI file of 5GS includes a virtual IP address of the UPF, which is used by the master station device to send information to the UPF subsequently.

For example, the master station obtains an ENI file by compiling the ESI file of 5GS and the ESI file of the auxiliary station equipment. The ENI file includes the addresses of multiple terminal equipment, the identification information of the terminal equipment, the connection relationship between the terminal equipment and the auxiliary equipment, and The serial number identifier of the terminal device determined according to the sequence between the secondary station devices. For example, the address of the terminal device may be the MAC address of the terminal device, and the serial number identifier of the terminal device represents the forwarding sequence of EtherCAT type data packets between the terminal devices.

For example, the identification information of the terminal device is A and B respectively, and the serial number identification of the terminal device is the number 1 and the number 2 respectively, where the number 1 represents the meaning that the terminal device A is the first to receive the EtherCAT type data packet. The meaning represented by the number 2 is that the terminal device B is the second terminal device that receives EtherCAT type data packets.

Step 602, the master station device sends the information of the terminal device to the UPF. For example, the master station device uses the virtual IP address in step 601 to send the information of the terminal device to the UPF. The information includes address information of the terminal device, for example, the MAC address of the terminal device, the identification information of the terminal device, and the serial number identification of the terminal device.

For example, the master station device sends the information of the terminal device to the UPF by means of mailbox communication. When using the mailbox communication, the data packet containing the information of the terminal device has a header of the mailbox communication, and the header contains a protocol type , such as the Hypertext Transfer Protocol (HTTP) protocol.

For example, in the mailbox communication method used by the master station device, the ether type of the transmitted data packet containing the information of the terminal device is 0800h.

For example, the information of the terminal devices sent by the master station device to the UPF includes the information of two terminal devices. For example, the identification information of the terminal equipment is A and B, respectively. The serial number identification of the terminal device is the number 1 and the number 2, where the number 1 represents that the terminal device A is the first terminal device to receive the EtherCAT type data packet, and the number 2 represents that the terminal device B is the second terminal device. An end device that receives packets of EtherCAT type.

Step 603, the UPF obtains information of the terminal device.

For example, UPF identifies packets transmitted by means of mailbox communications based on the type of ether (eg, 0800h). When the UPF receives the data packet containing the information of the terminal device, obtains the data in the data packet, sends the data to the HTTP application layer for analysis, and finally the UPF obtains the information of the terminal device.

For example, the information of the terminal device includes the MAC address of the terminal device, the identification information of the terminal device, and the serial number identification of the terminal device.

Step 604, the UPF sends the information of the terminal device to the SMF.

Step 605, the SMF creates a virtual network group according to the information of the terminal device, and generates a forwarding rule and a data packet detection rule.

For example, SMF creates a virtual network group for terminal device A and terminal device B.

For example, the SMF creates the virtual network group by invoking the UDM, or the SMF sends the information of the terminal device to the AF, and the AF invokes the interface opened by the NEF to invoke the UDM to create the virtual network group. The information of the virtual network group is stored in a data storage device (not shown in the figure) by the UDM, for example, a unified data repository (Unified Data Repository, UDR). For example, the information of the virtual network group includes the identification information of the terminal device, the serial number identifier of the terminal device, the address of the terminal device, and the group identification information of the virtual network group.

For example, the SMF obtains the information of the virtual network group from the UDR through the UDM, and generates forwarding rules and data packet inspection rules according to the information of the virtual network group. For the forwarding rule and the data packet detection rule, reference may be made to the description in step 504 in FIG. 5 , which will not be repeated here.

Step 606, the SMF sends the forwarding rule and the data packet inspection rule to the UPF. For this step, reference may be made to the description of step 505 in FIG. 5 . Optionally, the SMF sends the group identification information of the virtual network group to the UPF.

Step 607, after receiving the forwarding rule and the data packet inspection rule, the UPF sends a response message to the SMF. For this step, reference may be made to the description of step 506 in FIG. 5 .

In addition, the network side may also perform other steps for establishing the session between the UPF and the terminal device A, so that the establishment of the session between the UPF and the terminal device A is completed. Similarly, the network side may also perform other steps for establishing a session between the UPF and the terminal device B, so that the establishment of the session between the UPF and the terminal device B is completed.

Step 608, the SMF sends a session establishment completion response message to the master station device through the AF. The session establishment completion response information is used to notify the master station device that the session establishment is completed, and can send EtherCAT type data packets to the terminal device.

Step 609, the master station device sends the EtherCAT type data packet to the terminal device through the UPF in the 5GS. For example, the master station device sends EtherCAT type data packets to the terminal device through the UPF and (R)AN (not shown in the figure) in the 5GS in turn.

Step 610, the terminal device A identifies the EtherCAT type data packet and forwards it to the auxiliary station device.

Step 611, the terminal device A sends to the UPF the EtherCAT type data packets that have been forwarded according to the forwarding sequence of the multiple secondary station devices.

Step 612, the UPF determines and changes the destination address and source address of the current EtherCAT type data packet.

Step 613, the UPF sends the EtherCAT type data packet to the terminal device B.

Step 614, the terminal device B identifies the EtherCAT type data packet and forwards it to the auxiliary station device.

Step 615, the terminal device B sends the EtherCAT type data packets to the UPF after the forwarding is completed according to the forwarding sequence of the multiple secondary station devices.

Step 616, the UPF determines and changes the destination address and source address of the current EtherCAT type data packet.

Step 617, the UPF sends the EtherCAT type data packet to the master station device. So far, a complete EtherCAT type packet forwarding process is completed.

For steps 609 to 617 , reference may be made to the descriptions of steps 509 to 517 in FIG. 5 , which are not repeated in this embodiment.

It should be noted that, similar to the embodiment shown in FIG. 5 , this solution is also applicable to the solution of not creating a virtual network group for terminal devices, that is, in step 605, the SMF generates forwarding rules and data packet detection according to the information of the terminal devices. According to the rules, the UPF completes the forwarding of the data packet. At this time, step 611 in this solution adopts the first or second optional implementation manner.

Similarly, when the information of the terminal device changes, if the UDM in the core network has created a virtual network group for the terminal device, the SMF updates the information of the virtual network group in the UDM according to the updated information of the terminal device. There is no virtual network group created for the terminal device in the SMF, then the SMF updates the forwarding rule according to the updated information of the terminal device, and sends it to the UPF.

In this embodiment, the master station obtains the ESI files of the 5GS and the auxiliary station equipment, compiles and generates the ENI file, obtains the information of the terminal equipment, and sends the information of the terminal equipment to the UPF by means of mailbox communication, without relying on the customized API interface. The information transmission of the terminal equipment between the main station equipment and the 5GS, this method reduces the changes to the main station equipment.

FIG. 7 is a schematic diagram of another flow interaction of data packet forwarding according to an embodiment of the present application. This embodiment includes the following steps:

Step 701, the terminal device acquires the built-in information of the auxiliary station device through the connected auxiliary station device.

For example, terminal device A is connected to auxiliary station device 1 and auxiliary station device 2 , and terminal device B is connected to auxiliary station device 3 and auxiliary station device 4 . Taking the auxiliary station equipment 1 as an example, the built-in information of the auxiliary station equipment 1 includes the information of the connection between the auxiliary station equipment 1 and the terminal equipment A, and also includes the serial number identification information of the terminal equipment A, such as the number 1 (the meaning of the number 1 is: Terminal device A is the first terminal device that receives EtherCAT type data packets), and other terminal devices, such as terminal device B, also included in the industrial Ethernet system after the EtherCAT and 5GS networking.

For example, the built-in information of the auxiliary station device may include an IP address of a virtual UPF, and the address information may be used for mailbox communication between the terminal device and the UPF.

Step 702, the terminal device sends a connection establishment request message to the UPF. In addition, the terminal device may also send a request for establishing a virtual network group to the UPF. The connection establishment request information is used for the terminal device to establish a connection with the UPF, which is used for the execution of the subsequent step 703 . In addition, the request for establishing the virtual network group is used by the UPF to send the request for establishing the virtual network group to the SMF after receiving the information of the terminal device, so as to be used by the SMF to create the virtual network group in the subsequent steps, so that in the subsequent steps The forwarding of EtherCAT type data packets can adopt the forwarding mode of 5GLAN.

Step 703, the terminal device sends the information of the terminal device to the UPF. The information includes address information of the terminal device, identification information of the terminal device, and serial number identification of the terminal device. For example, the address of the terminal device may be the MAC address of the terminal device, and the sequence number identifier represents the forwarding sequence of the EtherCAT type data packets between the terminal devices.

For example, the terminal device sends the information of the terminal device to the UPF by means of mailbox communication. For this step, reference may be made to the description about mailbox communication in step 602 in FIG. 6 .

Step 704, the UPF obtains information of the terminal device.

For example, the UPF receives the data packet transmitted by means of mailbox communication in step 703, and obtains the information of the terminal device from the data packet. This step may refer to the description in step 603 in FIG. 6 .

Step 705, the UPF sends the information of the terminal device to the SMF.

So far, the SMF has obtained the information of the terminal device.

In addition, the method for the SMF to obtain the information of the terminal equipment can also use the method of non-access stratum (NAS) communication. NAS communication is a kind of communication between the terminal equipment and the control plane network elements in the core network directly through the RAN. In this method, NAS signaling is used for information transmission between the terminal equipment and the control plane network element, and the terminal equipment adds the information of the terminal equipment to the NAS signaling, and sends the information of the terminal equipment to the SMF.

Step 706 is subsequently executed.

Step 706, the SMF creates a virtual network group, and generates forwarding rules and data packet inspection rules.

For example, the SMF creates a virtual network group based on the information of the terminal device.

For example, the SMF calls the UDM to create the virtual network group, or the SMF sends the information of the terminal device to the AF, and the AF calls the interface opened by the NEF to call the UDM to create the virtual network group. The information of the virtual network group is stored in a data storage device (not shown in the figure) by the UDM, for example, the UDR. For example, the information of the virtual network group includes the identification information of the terminal device, the serial number identifier of the terminal device, the address of the terminal device, and the group identification information of the virtual network group.

Step 707, the SMF sends the forwarding rule and the data packet inspection rule to the UPF. This step may refer to the description in step 505 in FIG. 5 .

Step 708, after receiving the forwarding rule and the data packet inspection rule, the UPF sends a response message to the SMF. For this step, reference may be made to the description of step 506 in FIG. 5 .

Step 709, the SMF sends a session establishment complete response message to the AF. The session establishment completion response information is used to notify the AF that the session establishment is completed, and the information of the virtual network group can be sent to the master station device.

Step 710, the AF sends the information of the virtual network group to the master station device.

For example, the information of the virtual network group includes the MAC address of the terminal device, the identification information of the terminal device, the serial number identifier of the terminal device, and the group identification information of the virtual network group.

For example, the AF obtains the information of the virtual network group through UDM, and sends the information of the virtual network group to the master station device.

For example, the AF obtains the information of the virtual network group through the SMF, and sends the information of the virtual network group to the master station device.

For example, the master station device may modify the information of the terminal device, for example, the master station device exchanges the serial number identifiers of the terminal device A and the terminal device B as required. If the master station device modifies the information of the terminal device, the master station device can re-implement the creation of the virtual network group and the forwarding of EtherCAT type data packets according to the methods in the embodiments shown in FIG. 5 and FIG. 6 .

Step 711, the master station device sends EtherCAT type data packets to the terminal device.

For example, the master device sends EtherCAT type data packets to end device A via UPF.

For example, the master station device sends EtherCAT type data packets to the terminal device A through the UPF and (R)AN (not shown in the figure) in the 5GS in sequence.

For example, the source address information of the data packet is the address of the main station device, and the destination address information of the data packet is the address of the terminal device A (the serial number identifier is 1), for example, the address information is the MAC address.

For example, when the UPF receives the data packet, according to the data packet detection rules, it detects that the data packet is an EtherCAT type data packet of the virtual network group, and sends the data packet to the terminal device A according to the forwarding rules.

Step 712, the terminal device A identifies the EtherCAT type data packet and forwards it to the auxiliary station device.

Step 713: The terminal device A sends an EtherCAT type data packet to the UPF, where the data packet is a data packet that has been forwarded according to the forwarding sequence of the multiple secondary station devices.

Step 714, the UPF determines and changes the destination address and source address of the current EtherCAT type data packet.

Step 715, the UPF sends the EtherCAT type data packet to the terminal device B.

Step 716, the terminal device B identifies the EtherCAT type data packet and forwards it to the secondary station device.

Step 717: The terminal device B sends to the UPF the EtherCAT type data packets that have been forwarded according to the forwarding sequence of the multiple secondary station devices.

Step 718, the UPF determines and changes the destination address and source address of the current EtherCAT type data packet.

Step 719, the UPF sends the EtherCAT type data packet to the master device. So far, a complete EtherCAT type packet forwarding process is completed.

Steps 711 to 719 may refer to the descriptions of steps 509 to 517 in FIG. 5 .

It should be particularly noted that this solution is also applicable to the solution of not creating a virtual network group for the terminal device, that is, in step 706, the SMF does not perform the action of creating a virtual network group after obtaining the information of the terminal device through the UPF. The AF can receive terminal device information from the SMF through the serviced interface. Likewise, step 713 in this solution adopts the first or second optional implementation manner.

Similarly, when the information of the terminal device changes, if the UDM in the core network has created a virtual network group for the terminal device, the SMF updates the information of the virtual network group in the UDM according to the updated information of the terminal device. If there is no virtual network group created for the terminal device in the SMF, the SMF updates the forwarding rule according to the updated information of the terminal device, and sends it to the UPF.

In this embodiment, the 5GS obtains built-in information through the auxiliary station equipment, and the SMF in the 5GS generates forwarding rules and data packet detection rules according to the information of the terminal equipment in the built-in information.

The embodiments shown in FIG. 5 to FIG. 7 also use the UPF to forward data packets to the terminal device, and complete the forwarding of EtherCAT type data packets according to the forwarding logic of EtherCAT. The method in this embodiment is a method for using the built-in information of auxiliary station equipment to provide terminal equipment information for 5GS in practical industrial scenarios, which can more flexibly implement industrial communication in an industrial communication system integrating 5GS and EtherCAT.

FIG. 8 is a schematic diagram of another flow interaction of data packet forwarding according to an embodiment of the present application.

In this embodiment, the EtherCAT type data packet forwarding method is a device-to-device (Device-to-Device, D2D) forwarding method, and D2D is a method for direct communication between two terminal devices.

In step 801, the 5GS or the main station device obtains the information of the terminal device and creates a virtual network group.

For example, the master station device sends the information of the terminal device to the AF, and the AF calls the UDM through the NEF to complete the creation of the virtual network group. For this step, reference may be made to the descriptions in steps 501 to 502 in FIG. 5 .

For example, the main station device obtains the ESI file of the auxiliary station device and 5GS offline, generates the ENI file by compiling the ESI file, obtains the information of the terminal device, and sends the information of the terminal device to the UPF in the 5GS through mailbox communication, UPF obtains the information of the terminal device from the data packet of mailbox communication and sends the information of the terminal device to SMF. SMF calls UDM, or SMF calls UDM through AF to create a virtual network group for the terminal device, and the virtual network group Group information is stored in UDRs. For this step, reference may be made to the descriptions in steps 601 to 605 in FIG. 6 .

For example, the terminal device obtains built-in information of the auxiliary station device through the auxiliary station device, the built-in information includes information of the terminal device, and the terminal device sends the information of the terminal device to the UPF. Then the UPF sends the information of the terminal device to the SMF, the SMF calls the UDM, or the SMF calls the UDM through the AF to create a virtual network group for the terminal device, and stores the information of the virtual network group in the UDR. For this step, reference may be made to the descriptions in steps 701 to 706 in FIG. 7 .

Step 802, the AF acquires the information of the virtual network group.

For example, the AF obtains the information of the virtual network group through the SMF, or the AF obtains the information of the virtual network group through the UDM.

Step 803, the AF sends the D2D quality of service (Quality of service, QoS) requirements to the (R)AN through the PCF and the AMF in turn.

For example, the AF configures D2D communication between terminal devices according to the information of the virtual network group. AF determines whether D2D communication can be established between two adjacent terminal devices identified by the serial number according to the identification of the terminal device. QoS requirements, such as D2D PC5/Uu interface connection information, where the PC5 interface is a short-distance direct communication interface between terminal devices, and the Uu interface is a communication interface between a terminal device and a base station. The Uu interface enables reliable communication over long distances and greater ranges. Because there are two different forwarding modes in D2D, that is, direct communication between terminal devices, or communication between terminal devices and other terminal devices through a base station (this method is communication within the RAN). Therefore the (R)AN can be configured with QoS requirements to enable D2D communication.

For example, if the sequence number identifies that D2D communication cannot be established between two adjacent terminal devices, the forwarding of EtherCAT type data packets between the two terminal devices can be implemented through UPF, that is, terminal device A sends EtherCAT type data to UPF. Packet, UPF uses the forwarding mode of 5G LAN to directly forward the EtherCAT type data packet to terminal device B through the internal interface.

Optionally, the AF sends the group identification information of the virtual network group to the (R)AN through the PCF and the AMF in turn, and the group identification information of the virtual network group can be used for the terminal device to identify the EtherCAT type. The session of the data packet, and then identify the EtherCAT type of data packet.

Step 804, the AF sends the D2D QoS requirements and policy information configuration information to the terminal device through the PCF and AMF (not shown in the figure) in sequence. For example, D2D QoS requirements and policy information configuration information are used to authenticate and establish a D2D connection between two terminal devices.

For example, the policy information is shown in Table 3:

Table 3 Policy Information

序号serial number	终端设备的地址the address of the end device
11	终端设备A的地址Address of terminal device A
22	终端设备B的地址Address of terminal device B

Step 805: After the D2D configuration is established between the terminal devices, a D2D configuration completion response message is sent to the master device.

For example, the terminal device sends the D2D configuration completion response information to the master station device through the UPF in the 5GS.

Step 806: After receiving the D2D configuration completion response information, the master station device sends an EtherCAT type data packet to the terminal device A.

For example, the terminal device sends EtherCAT type data packets to the terminal device through the UPF in 5GS.

Step 807, the terminal device A identifies the EtherCAT type data packet and forwards it to the auxiliary station device.

For example, end devices identify EtherCAT type packets based on the EtherType value (eg, 88A4h).

Optionally, the group identification information of the virtual network group may also be used by the terminal device to identify the EtherCAT type data packet.

For this step, reference may be made to the description of step 510 in the embodiment shown in FIG. 5 .

Step 808, the terminal device A sends the EtherCAT type data packet to the terminal device B in a D2D manner.

In the first optional implementation, terminal device A receives an EtherCAT type data packet from the UPF, and according to the policy information shown in Table 3, determines to send the EtherCAT type data packet to terminal device B, and terminal device A modifies the EtherCAT type The destination address of the data packet is the address of terminal device B, the source address is modified to the address of terminal device A, and the EtherCAT type data packet is sent to terminal device B through D2D.

The second optional implementation manner, when the terminal devices in the virtual network group cannot completely use the D2D method to complete the sequential forwarding of the EtherCAT type data packets, this step can use the D2D method and UPF to forward the EtherCAT type data packets. The way of combining the method (the forwarding method of 5G LAN), completes the sequential forwarding of EtherCAT type data packets. For example, if the virtual network group includes terminal device A (the serial number is identified as number 1), terminal device B (the serial number is identified as number 2), and terminal device C (the serial number is identified as number 3) (not shown in the figure), the terminal Device B cannot establish a D2D connection with terminal device C, so after terminal device B receives the EtherCAT type data packet from terminal device A through D2D, terminal device B compares the source address and destination address in the EtherCAT type data packet. Modify, that is, modify the destination address to the address of terminal device C, modify the source address to the address of terminal device B, and send the EtherCAT type data packet to the UPF, and the UPF uses the internal interface to send the data packet to terminal device C.

The third optional implementation manner, when the terminal devices in the virtual network group cannot completely use the D2D method to complete the sequential forwarding of the EtherCAT type data packets, this step can use the D2D method and UPF to forward the EtherCAT type data packets. (the embodiments shown in FIG. 5 to FIG. 7 ) are combined to complete the sequential forwarding of EtherCAT type data packets. For example, if the virtual network group includes terminal device A (the serial number is identified as number 1), terminal device B (the serial number is identified as number 2), and terminal device C (the serial number is identified as number 3) (not shown in the figure), the terminal Device B cannot establish a D2D connection with terminal device C. After terminal device B receives the EtherCAT type data packet from terminal device A through D2D, terminal device B sends the EtherCAT type data packet to UPF. According to the forwarding rules, UPF, The destination address in the data packet is modified to the address of the terminal device C, and the data packet is sent to the terminal device C.

Step 809, the terminal device B identifies the EtherCAT type data packet and forwards it to the auxiliary station device.

This step may refer to the description of step 807 .

So far, all terminal devices in the virtual network group have completed the forwarding of EtherCAT type data packets, that is, the last terminal device in the EtherCAT forwarding logic sequence, after receiving the EtherCAT type data packets, to the wired connection. The auxiliary station device sends the data packet in the sequence of wired connection, and receives the EtherCAT type data packet from the last auxiliary station device in the sequence of wired connection.

Step 810, the terminal device B sends the EtherCAT type data packet to the UPF.

For example, the last terminal device in the forwarding logic of EtherCAT is terminal device B. When terminal device B receives the EtherCAT type data packet from terminal device A, according to the policy information shown in Table 3, it is determined to send the data to the master device. After sending the EtherCAT type data packet, the terminal device B sends the EtherCAT type data packet to the UPF. Optionally, terminal device B modifies the destination address of the EtherCAT type data packet to the address of the master station device, and the source address is modified to the address of terminal device B, and terminal device B sends the EtherCAT type data packet to the UPF.

Step 811, the UPF determines and changes the destination address and source address of the EtherCAT type data packet.

For example, according to the information of the terminal device or the information of the virtual network group obtained in step 801, the UPF determines that the EtherCAT type data packet received in step 810 should be sent to the master station device. If in step 810, the terminal device does not change the destination address of the EtherCAT type data packet to the address of the master station device, the UPF changes the destination address of the EtherCAT type data packet to the address of the master station device, and changes the source of the EtherCAT type data packet. The address is the address of the terminal device that sends the EtherCAT type data packet to the UPF in step 810 .

In step 812, the UPF sends the EtherCAT type data packet to the master station device. So far, a complete EtherCAT type data packet forwarding process is completed.

It should be particularly noted that this solution is also applicable to a solution in which a virtual network group is not created for a terminal device, that is, the creation of a virtual network group may not be performed in this embodiment. The AF can use the method of directly acquiring the information of the terminal device from the main station device in the embodiment shown in FIG. 5, or the AF can also use the communication between the UPF and the main station device in the embodiment shown in FIG. 6 to acquire the terminal device from the UPF. The AF can also obtain the information of the terminal device by using the method of obtaining the information of the built-in terminal device from the auxiliary station device in the embodiment shown in FIG. 7 . The AF generates policy information according to the information of the terminal device, and sends it to the terminal device. The data packets can be forwarded between the terminal devices in a D2D manner, or can be forwarded according to the first or third optional implementation manner in step 808. The method completes the forwarding of the data packet.

Through the method in this embodiment, the forwarding of EtherCAT type data packets reduces the forwarding between the terminal device and the core network device (for example, UPF), and reduces the delay of the communication system, so that the industrial communication system integrated with 5GS and EtherCAT can Supports communication with lower latency.

FIG. 9 is a schematic diagram of another flow interaction of data packet forwarding according to an embodiment of the present application. This embodiment will be described in conjunction with the embodiment shown in FIG. 5 to FIG. 7 , and the embodiment includes the following steps:

Step 901, the user plane function device receives the forwarding rule from the session management function device. For the forwarding rule, reference may be made to the description about the forwarding rule in step 504 in the embodiment shown in 5, which is not repeated here.

In an optional implementation manner, the user plane function device may be UPF, and the session management function device may be SMF.

In an optional implementation manner, the user plane function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, and sends the information to the session management function device. The serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, the forwarding rule is set by the session management function device according to the serial number information of the first terminal device, the second terminal device The serial number information of the device, the address of the first terminal device and the address of the second terminal device are generated. For example, the first terminal device is terminal device A, the second terminal device is terminal device B, the serial number of the first terminal device is number 1, the serial number of the second terminal device is number 2, and the first terminal device is EtherCAT forwarding sequence receiving The terminal device of the data packet sent by the master station device, and the second terminal device is the terminal device that receives the data packet from the first terminal device in the EtherCAT forwarding sequence.

In an optional implementation manner, the forwarding rule includes serial number information of the first terminal device, serial number information of the second terminal device, an address of the first terminal device, and an address of the second terminal device.

In an optional implementation manner, the user plane function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device from the master station device. For this implementation, reference may be made to the description of step 602 in the embodiment shown in FIG. 6 .

In an optional implementation manner, the user plane function device obtains the serial number information of the first terminal device and the address of the first terminal device from the first terminal device, and obtains the serial number information of the second terminal device and the second terminal device from the second terminal device. The address of the device. For this implementation, reference may be made to the description of step 703 in the embodiment shown in FIG. 7 .

For this step, reference may be made to the description of step 505 in the embodiment shown in FIG. 5 , step 606 in the embodiment shown in FIG. 6 , or step 707 in the embodiment shown in FIG. 7 .

Step 902, the user plane function device receives the first data packet of the Ethernet type from the master station device.

In an optional implementation manner, the first data packet of the Ethernet type is a data packet of the EtherCAT type.

Step 903, the user plane function device sends a first data packet to the first terminal device.

Steps 902 and 903 may refer to the description of step 509 in the embodiment shown in FIG. 5 , or, steps 902 and 903 may refer to the description of step 609 of the embodiment shown in FIG. 6 , or, steps 902 and 903 may refer to FIG. 6 . 7 is a description of step 711 of the embodiment shown.

Step 904, the user plane function apparatus receives a second data packet associated with the first data packet from the first terminal device.

In an optional implementation manner, the second data packet may be the same as the first data packet, or may be different from the first data packet.

In an optional implementation manner, the first terminal device sends the first data packet to the connected auxiliary station device, and the auxiliary station device can modify the information in the first data packet, or the first terminal device can modify the information in the first data packet. The destination address is modified to the address of the second terminal device, or the first terminal device modifies the destination address of the data packet whose information in the data packet has been modified by the auxiliary station device to the address of the second terminal device. At this time, the first data packet is for the second data packet. For this implementation manner, reference may be made to the description of step 510 in the embodiment shown in FIG. 5 , step 610 in the embodiment shown in FIG. 6 , or step 712 in the embodiment shown in FIG. 7 .

For this step, reference may be made to the description of step 511 in the embodiment shown in FIG. 5 , step 611 in the embodiment shown in FIG. 6 , or step 713 in the embodiment shown in FIG. 7 .

Step 905, the user plane function device modifies the destination address of the second data packet to the address of the second terminal device according to the forwarding rule to obtain a third data packet.

That is to say, the destination address in the third data packet is the address of the second terminal device.

An optional implementation manner, after receiving the data packet, the user plane functional device detects the data packet according to the data packet detection rule, and determines that the current data packet is from the terminal device A according to the forwarding rule and the address information in the current data packet. After receiving the data packet, the EtherCAT type data packet is subsequently sent to the terminal device B, then the user plane function device modifies the source address in the EtherCAT type data packet to the address of the main station device, and the destination address is modified to the address of the terminal device B. , and send it to terminal device B. For this step, reference may be made to the description of step 512 in the embodiment shown in FIG. 5 , step 612 in the embodiment shown in FIG. 6 , or step 714 in the embodiment shown in FIG. 7 .

Step 906, the user plane function device sends a third data packet to the second terminal device.

In an optional implementation manner, the method further includes: the user plane function device receives a fourth data packet from a third terminal device, where the third terminal device may be the second terminal device, or a third terminal device other than the first terminal device and the second terminal device. other terminal equipment of the device.

When the third terminal device is the second terminal device, the user plane function device receives the fourth data packet associated with the third data packet from the second terminal device, for example, the second terminal device sends the third data packet to the auxiliary station device connected by wire Three data packets, the auxiliary station equipment can modify the information in the third data packet, or the second terminal equipment can modify the destination address of the third data packet to the address of the third terminal equipment, or the second terminal equipment can modify the information in the auxiliary station equipment The destination address of the data packet whose information in the data packet has been modified is modified to the address of the third terminal device, and the fourth data packet is different from the third data packet; modification, and the second terminal device does not modify the destination address in the third data packet, then the fourth data packet is the same as the third data packet.

A possible implementation manner, the forwarding sequence of the EtherCAT type data packet only includes the first terminal device and the second terminal device, then the user plane function device sends the fifth data packet associated with the fourth data packet to the master station device, The destination address of the fifth data packet is the address of the main station device.

Or, when the third terminal device is another terminal device other than the first terminal device and the second terminal device, the user plane function device receives a sixth data packet associated with the third data packet from the second terminal device, the sixth data packet The relationship with the third data packet can be referred to the above description, and will not be repeated. The user plane function device modifies the destination address in the sixth data packet to the address of the third terminal device, obtains the seventh data packet, and sends it to the third terminal device. The seventh packet is sent.

A possible implementation manner, the forwarding sequence of the EtherCAT type data packet only includes the first terminal device, the second terminal device and the third terminal device, then the user plane function device sends the data packet associated with the seventh data packet to the master station device. The fifth data packet, wherein the destination address of the fifth data packet is the address of the base station device.

Through this method, the user plane functional device can modify the destination address of the EtherCAT type data packet according to the forwarding rules, and execute the forwarding of the data packet. Therefore, the industrial communication system integrated with 5GS and EtherCAT can realize the execution of EtherCAT type data according to the forwarding logic of EtherCAT. In-order forwarding of packets.

FIG. 10 is a schematic diagram of another flow interaction of data packet forwarding according to an embodiment of the present application. This embodiment will be described in conjunction with the embodiment shown in FIG. 5 to FIG. 7 , and the embodiment includes the following steps:

Step 1001, the session management function apparatus acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device.

A possible implementation manner, the session management function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the second terminal device from the master station device through the user plane function device. the address of. For this implementation manner, reference may be made to the description of steps 601 to 604 in the embodiment shown in FIG. 6 .

A possible implementation manner, the session management function device obtains the serial number information of the first terminal device and the address of the first terminal device from the first terminal device through the user plane function device, and obtains the serial number information of the second terminal device from the second terminal device. and the address of the second terminal device. For this implementation manner, reference may be made to the description of steps 701 to 705 in the embodiment shown in FIG. 7 .

Based on the above two possible implementations, the session management function device sends the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device to the unified data management device. The serial number information of a terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device are used to create or update a virtual network group, and the virtual network group includes the first terminal device and the second terminal device. Two terminal equipment. For this implementation manner, reference may be made to the description of step 605 in the embodiment shown in FIG. 6 or step 706 in the embodiment shown in FIG. 7 .

In a possible implementation manner, the session management function apparatus obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device from the unified data management device. For this implementation, reference may be made to the description of step 503 in the embodiment shown in FIG. 5 .

Step 1002, the session management function device generates a forwarding rule according to the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device. The forwarding rule is used to modify the destination address of the first data packet.

A possible implementation manner, the forwarding rule is used by the user plane function device to modify the destination address of the first data packet, that is, when the first data packet is received by the user plane function device from the first terminal device, the forwarding rule is used by the user The plane function device modifies the destination address of the first data packet to the address of the second terminal device.

For this step, reference may be made to the description of step 504 in the embodiment shown in FIG. 5 , step 605 in the embodiment shown in FIG. 6 , or step 706 in the embodiment shown in FIG. 7 .

Step 1003, the session management function device sends a forwarding rule to the user plane function device.

Through this method, the session management function device generates a forwarding rule, and the end user plane function device can modify the destination address of the EtherCAT type data packet according to the forwarding rule, and execute the forwarding of the data packet. Therefore, the industrial communication system integrated with 5GS and EtherCAT can realize In-order forwarding of EtherCAT-type packets is performed according to the forwarding logic of EtherCAT.

FIG. 11 is a schematic diagram of a communication apparatus provided according to an embodiment of the present application.

The communication device includes a processing module 1101 , a receiving module 1102 and a sending module 1103 . The processing module 1101 is used to implement data processing by the communication device. The receiving module 1102 is used to receive the content of the communication device and other units or network elements, and the sending module 1103 is used to receive the content of the communication device and other units or network elements. It should be understood that the processing module 1101 in this embodiment of the present application may be implemented by a processor or a processor-related circuit component (or referred to as a processing circuit), and the receiving module 1102 may be implemented by a receiver or a receiver-related circuit component. The sending module 1103 may be implemented by a transmitter or a transmitter-related circuit component.

Exemplarily, the communication device may be a communication device device, or a chip applied in the communication device device or other combined devices, components, etc. having the functions of the above-mentioned communication device device.

Exemplarily, the communication device may be the SMF or the session management function device in any of FIG. 5 to FIG. 10 , or the UPF or the user plane function device in any of FIGS. 5 to 9 , or the device of FIG. 5 to FIG. 9 (terminal device A or terminal device B in FIG. 5 to FIG. 8 , the first terminal device or the second terminal device in FIG. 9 ), or the terminal device in FIG. 5 , FIG. 7 and FIG. 8 Any of the AFs may be any of the UDMs of FIGS. 5 , 7 and 8 .

When the communication device is a UPF or a user plane functional device, the receiving module 1102 is configured to receive forwarding rules from the session management functional device (eg, step 505 in FIG. 5 , step 606 in FIG. 6 , step 707 in FIG. 7 , and step 707 in FIG. Step 901 in 9); the receiving module 1102 is used to receive the first data packet of the Ethernet type from the master station device (for example, step 509 in FIG. 5, step 609 in FIG. 6, step 711 in FIG. 7, and FIG. 9 The sending module 1103 is used to send the first data packet to the first terminal device (for example, step 509 in FIG. 5 , step 609 in FIG. 6 , step 711 in FIG. 7 , step 903 in FIG. 9 ) ); the receiving module 1102 is configured to receive the second data packet associated with the first data packet from the first terminal device (eg, step 511 in FIG. 5 , step 611 in FIG. 6 , step 713 in FIG. 7 , and step 713 in FIG. 9 ). The processing module 1101 is used to modify the destination address of the second data packet to the address of the second terminal device according to the forwarding rule (for example, step 512 in FIG. 5 , step 612 in FIG. 6 , step in FIG. 7 ) 714, step 905 in Fig. 9) to obtain the third data packet; the sending module 1103 is used to send the third data packet to the second terminal device according to the forwarding rule (for example, step 513 in Fig. 5, step 613 in Fig. 6, Step 715 in Figure 7, Step 906 in Figure 9).

In addition, the various modules described above may also be used to support other processes of the techniques described herein. For the beneficial effects, reference may be made to the foregoing description, which will not be repeated here.

When the communication device is an SMF or a session management function device, the receiving module 1102 is configured to obtain the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device (for example, Step 503 in FIG. 5 , Step 604 in FIG. 6 , Step 705 in FIG. 7 , Step 1001 in FIG. 10 ); the processing module 1101 is configured to use the serial number information of the first terminal device and the serial number information of the second terminal device according to the , the address of the first terminal device and the address of the second terminal device generate forwarding rules (for example, step 504 in FIG. 5, step 605 in FIG. 6, step 706 in FIG. 7, step 1002 in FIG. 10), forwarding rules For the modification of the destination address of the first data packet; the sending module 1103 is used to send the forwarding rules to the user plane functional device (for example, step 505 in FIG. 5 , step 606 in FIG. 6 , step 707 in FIG. 7 , and FIG. 10 in step 1003).

When the communication device is a terminal device, the receiving module 1102 is configured to receive policy information (eg, step 804 in FIG. 8 ); the receiving module 1102 is configured to receive the first data packet of the Ethernet type (eg, step 806 in FIG. 8 ) ; The processing module 1101 is used to modify the destination address in the first data packet according to the policy information to be the address of the second terminal device (for example, step 809 in FIG. 8 ) to obtain the second data packet; The sending module 1103 is used to send the second terminal to the The device sends the second data packet (eg, step 809 in Figure 8).

When the communication device is an AF, the receiving module 1102 is configured to obtain the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device (for example, the steps in FIG. 5 ). 501); the processing module 1101 is configured to call the unified interface by calling the interface of the network open function device according to the serial number information of the first terminal equipment, the serial number information of the second terminal equipment, the identification of the first terminal equipment and the identification of the second terminal equipment. The data management device implements the creation or update of the virtual network group (eg, step 502 in FIG. 5 ).

Alternatively, the receiving module 1102 is used to obtain the serial number information of the first terminal device and the serial number information of the second terminal device (eg step 710 in FIG. 7 ); the sending module 1103 is used to send the serial number information of the first terminal device to the master station device and the serial number information of the second terminal device, the serial number information of the first terminal device and the serial number information of the second terminal device are used for the maintenance of the serial number information (for example, step 710 in FIG. 7 ).

When the communication device is UDM, the receiving module 1102 is configured to obtain the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device (for example, the steps in FIG. 5 ). 502, step 706 in Fig. 7, step 801 in Fig. 8); the processing module 1101 is used for according to the serial number information of the first terminal equipment, the serial number information of the second terminal equipment, the identification of the first terminal equipment and the second terminal equipment Create a virtual network group (for example, step 502 in FIG. 5, step 706 in FIG. 7, step 801 in FIG. 8); or, the processing module 1101 is used for the serial number information of the first terminal device, the second terminal The serial number information of the device, the identifier of the first terminal device and the identifier of the second terminal device update the information of the virtual network group (eg step 502 in FIG. 5 , step 706 in FIG. 7 , step 801 in FIG. 8 ).

FIG. 12 is a schematic diagram of another communication apparatus provided according to an embodiment of the present application. The communication apparatus includes: a processor 1201 , a communication interface 1202 , and a memory 1203 . Wherein, the processor 1201, the communication interface 1202 and the memory 1203 can be connected to each other through a bus 1204; the bus 1204 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus etc. The above-mentioned bus 1204 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one line is shown in FIG. 12, but it does not mean that there is only one bus or one type of bus. The processor 1201 may be a central processing unit (CPU), a network processor (NP), or a combination of CPU and NP. The processor may further include a hardware chip. The above-mentioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general-purpose array logic (Generic Array Logic, GAL) or any combination thereof. Memory 1203 may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache.

The processor 1201 is used for implementing data processing operations of the communication device, and the communication interface 1202 is used for implementing receiving operations and sending operations of the communication device.

When the communication device is a UPF or a user plane function device, the communication interface 1202 is configured to receive forwarding rules from the session management function device (eg, step 505 in FIG. 5 , step 606 in FIG. 6 , step 707 in FIG. Step 901 in 9); the communication interface 1202 is used to receive the first data packet of the Ethernet type from the master station device (for example, step 509 in FIG. 5, step 609 in FIG. 6, step 711 in FIG. 7, and FIG. 9 The communication interface 1202 is used to send the first data packet to the first terminal device (for example, step 509 in FIG. 5, step 609 in FIG. 6, step 711 in FIG. 7, and step 903 in FIG. 9). ); the communication interface 1202 is used to receive a second data packet associated with the first data packet from the first terminal device (eg, step 511 in FIG. 5 , step 611 in FIG. 6 , step 713 in FIG. 7 , and in FIG. 9 ). step 904); the processor 1201 is configured to modify the destination address of the second data packet to the address of the second terminal device according to the forwarding rule (for example, step 512 in FIG. 5 , step 612 in FIG. 6 , step 7 in FIG. 7 ) 714, step 905 in Fig. 9) to obtain the third data packet; the communication interface 1202 is used to send the third data packet to the second terminal device according to the forwarding rule (for example, step 513 in Fig. 5, step 613 in Fig. 6, Step 715 in Figure 7, Step 906 in Figure 9).

When the communication device is an SMF or a session management function device, the communication interface 1202 is used to obtain the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device (for example, Step 503 in FIG. 5 , Step 604 in FIG. 6 , Step 705 in FIG. 7 , Step 1001 in FIG. 10 ); the processor 1201 is configured to use the serial number information of the first terminal device and the serial number information of the second terminal device according to the , the address of the first terminal device and the address of the second terminal device generate forwarding rules (for example, step 504 in FIG. 5, step 605 in FIG. 6, step 706 in FIG. 7, step 1002 in FIG. 10), forwarding rules For the modification of the destination address of the first data packet; the communication interface 1202 is used to send the forwarding rules to the user plane functional device (eg step 505 in FIG. 5, step 606 in FIG. 6, step 707 in FIG. 7, FIG. 10 in step 1003).

When the communication device is a terminal device, the communication interface 1202 is used to receive policy information (eg, step 804 in FIG. 8 ); the communication interface 1202 is used to receive the first data packet of the Ethernet type (eg, step 806 in FIG. 8 ) ; The processor 1201 is used to modify the destination address in the first data packet according to the policy information to be the address of the second terminal device (for example, step 809 in FIG. 8 ) to obtain the second data packet; The communication interface 1202 is used to send the second terminal The device sends the second data packet (eg, step 809 in Figure 8).

When the communication device is AF, the communication interface 1202 is used to obtain the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device (for example, the steps in FIG. 5 ). 501); the processor 1201 is configured to call the unified interface by calling the interface of the network open function device according to the serial number information of the first terminal equipment, the serial number information of the second terminal equipment, the identification of the first terminal equipment and the identification of the second terminal equipment. The data management device implements the creation or update of the virtual network group (eg, step 502 in FIG. 5 ).

Alternatively, the communication interface 1202 is used to obtain the serial number information of the first terminal device and the serial number information of the second terminal device (for example, step 710 in FIG. 7 ); the communication interface 1202 is used to send the serial number information of the first terminal device to the master station device and the serial number information of the second terminal device, the serial number information of the first terminal device and the serial number information of the second terminal device are used for the maintenance of the serial number information (for example, step 710 in FIG. 7 ).

When the communication device is UDM, the communication interface 1202 is used to obtain the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device (for example, the steps in FIG. 5 ). 502, step 706 in Fig. 7, step 801 in Fig. 8); the processor 1201 is used for according to the serial number information of the first terminal equipment, the serial number information of the second terminal equipment, the identification of the first terminal equipment and the second terminal equipment Create a virtual network group (for example, step 502 in FIG. 5 , step 706 in FIG. 7 , step 801 in FIG. 8 ); or, the processor 1201 is configured to use the serial number information of the first terminal device, the second terminal The serial number information of the device, the identifier of the first terminal device and the identifier of the second terminal device update the information of the virtual network group (eg step 502 in FIG. 5 , step 706 in FIG. 7 , step 801 in FIG. 8 ).

An embodiment of the present application provides a communication system, which includes the aforementioned user plane function device (or UPF) and a session management function device (or SMF), wherein the user plane function device (or UPF) executes any one of FIG. 5 to FIG. 9 . In the method performed by the UPF or the user plane function device in the illustrated embodiment, the session management function device (or SMF) performs the method performed by the UE in the embodiments shown in FIG. 5 to FIG. 10 .

An embodiment of the present application further provides a communication system, which includes the aforementioned user plane function device (or UPF) and a terminal device (for example, terminal device A or terminal device B), wherein the terminal device executes the terminal device in the embodiment shown in FIG. 8 . A method performed by device A or terminal device B.

An embodiment of the present application further provides a communication system, which includes the aforementioned AF and UDM, wherein the AF performs the method performed by the AF in the embodiments shown in FIG. 5 , FIG. 7 , and FIG. 8 , and the UDM performs the method shown in FIGS. The method performed by the UDM in the embodiment shown in 8.

Embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium. When the computer program is executed by a computer, the computer can implement FIGS. 5 to 10 provided by the foregoing method embodiments. The process related to SMF in any one of the embodiments shown, or, the computer can implement the process related to UPF in any of the embodiments shown in FIG. 5 to FIG. 9 provided by the above method embodiment, or, The computer may implement the processes related to the terminal device in any of the embodiments shown in FIG. 5 to FIG. 9 provided by the above method embodiments, or the computer may implement the processes shown in FIG. 5 and FIG. 7 provided by the above method embodiments. Or the process related to AF in the embodiment shown in FIG. 8 , or the computer can implement the process related to UDM in the embodiment shown in FIG. 5 , FIG. 7 or FIG. 8 provided by the above method embodiment.

Embodiments of the present application further provide a computer program product, where the computer program product is used to store a computer program, and when the computer program is executed by a computer, the computer can implement any one of FIGS. 5 to 10 provided by the foregoing method embodiments. The process related to SMF in the shown embodiment, or the computer can implement the process related to UPF in any of the embodiments shown in FIG. 5 to FIG. 9 provided by the above method embodiment, or the computer The process related to the terminal device in any of the embodiments shown in FIG. 5 to FIG. 9 provided by the foregoing method embodiments may be implemented, or the computer may implement FIG. 5 , FIG. 7 , or FIG. 8 provided by the foregoing method embodiments. The process related to AF in the shown embodiment, or the computer can implement the process related to UDM in the embodiment shown in FIG. 5 , FIG. 7 or FIG. 8 provided by the above method embodiment.

The present application also provides a chip including a processor. The processor is configured to read and run the computer program stored in the memory to execute the corresponding operations and/or processes of the UDM, AF, UPF, SMF or terminal device in the method for registering to multiple networks provided in this application. Optionally, the chip further includes a memory, the memory and the processor are connected to the memory through a circuit or a wire, and the processor is used for reading and executing the computer program in the memory. Further optionally, the chip further includes a communication interface, and the processor is connected to the communication interface. The communication interface is used to receive processed data and/or information, and the processor acquires the data and/or information from the communication interface and processes the data and/or information. The communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip, and the like. The processor may also be embodied as a processing circuit or a logic circuit.

The above-mentioned chip can also be replaced by a chip system, which will not be repeated here.

The terms "comprising" and "having" in this application, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to the explicit lists Those steps or units listed may instead include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual conditions to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

In addition, the terms "first" and "second" in the description and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

Although the application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined by the appended claims, and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of this application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these 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 also intended to include these modifications and variations.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

A method for data packet transmission, characterized in that the method comprises:

the user plane function device receives the forwarding rule from the session management function device;

The user plane function device receives the first data packet of the Ethernet type from the master station device;

sending, by the user plane function device, the first data packet to the first terminal device;

receiving, by the user plane function device, a second data packet associated with the first data packet from the first terminal device;

The user plane function device modifies the destination address of the second data packet to the address of the second terminal device according to the forwarding rule to obtain a third data packet;

The user plane function device sends the third data packet to the second terminal device.
The method of claim 1, further comprising:

receiving, by the user plane function device, a fourth data packet from a third terminal device;

The user plane function device sends a fifth data packet associated with the fourth data packet to the master station device.
The method according to claim 1 or 2, further comprising:

The user plane function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device;

The user plane function device sends the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device, and the address of the second terminal device to the session management function device. address;

The serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device are used for generating forwarding rules.
The method according to claim 3, wherein the user plane function device acquires serial number information of the first terminal device, serial number information of the second terminal device, address of the first terminal device and the second terminal The address of the device, including:

The user plane function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device from the master station device .
The method according to claim 3, wherein the user plane function device acquires serial number information of the first terminal device, serial number information of the second terminal device, address of the first terminal device and the second terminal The address of the device, including:

obtaining, by the user plane function device, the serial number information of the first terminal device and the address of the first terminal device from the first terminal device;

The user plane function device acquires the serial number information of the second terminal device and the address of the second terminal device from the second terminal device.
The method according to any one of claims 1 to 5, wherein the forwarding rule includes serial number information of the first terminal device, address of the first terminal device, serial number information of the second terminal device, and all serial number information of the second terminal device. Describe the address of the second terminal device.
The method according to any one of claims 1 to 6, wherein the user plane function device modifies the destination address of the second data packet to the address of the second terminal device according to a forwarding rule, comprising:

The user plane function device determines to send the data in the second data packet to the second terminal device according to the forwarding rule, and the user plane function device modifies the destination address of the second data packet to the The address of the second terminal device.
A method for data packet transmission, characterized in that the method comprises:

The session management function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device;

The session management function device generates a forwarding rule according to the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, the The forwarding rule is used to modify the destination address of the first data packet;

The session management function device sends the forwarding rule to the user plane function device.
The method according to claim 8, wherein the session management function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, include:

The session management function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the first terminal device from the master station device through the user plane function device. 2. The address of the terminal device.
The method according to claim 8, wherein the session management function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, include:

The session management function device obtains the serial number information of the first terminal device and the address of the first terminal device from the first terminal device through the user plane function device, and obtains the first terminal device from the second terminal device. The serial number information of the second terminal device and the address of the second terminal device.
The method according to any one of claims 8 to 10, further comprising:

The session management function device sends the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the identifier of the second terminal device to the unified data management device,

The serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device, and the identifier of the second terminal device are used for creating or updating a virtual network group, and the The virtual network group includes the first terminal device and the second terminal device.
The method according to claim 8, wherein the session management function device obtains the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, include:

The session management function device acquires the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device, and the address of the second terminal device from the unified data management device. address.
The method according to any one of claims 8 to 12, wherein the forwarding rule includes serial number information of the first terminal device, serial number information of the second terminal device, address of the first terminal device and all Describe the address of the second terminal device.
A communication device, characterized in that the communication device comprises:

a receiving module, used for receiving the forwarding rule from the session management function device; receiving the first data packet of the Ethernet type from the master station device;

a sending module, configured to send the first data packet to the first terminal device;

The receiving module is further configured to receive a second data packet associated with the first data packet from the first terminal device;

a processing module, configured to modify the destination address of the second data packet to the address of the second terminal device according to the forwarding rule to obtain a third data packet;

The sending module is further configured to send the third data packet to the second terminal device.
The communication apparatus according to claim 14, wherein the receiving module is configured to receive a fourth data packet from a third terminal device;

The sending module is configured to send a fifth data packet associated with the fourth data packet to the master station device.
The communication apparatus according to claim 14 or 15, wherein the receiving module is configured to acquire serial number information of the first terminal device, serial number information of the second terminal device, the address of the first terminal device and the the address of the second terminal device;

The sending module is configured to send the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device to the session management function device. address;

The serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device are used for generating forwarding rules.
The communication apparatus according to claim 16, wherein the receiving module is configured to acquire serial number information of the first terminal device, serial number information of the second terminal device, and serial number information of the first terminal device from the master station device. address and the address of the second terminal device.
The communication apparatus according to claim 16, wherein the receiving module is configured to acquire the serial number information of the first terminal device and the address of the first terminal device from the first terminal device; the receiving module is configured to obtain the serial number information of the first terminal device from the first terminal device; The second terminal device acquires the serial number information of the second terminal device and the address of the second terminal device.
The communication apparatus according to any one of claims 14 to 18, wherein the processing module is configured to determine, according to the forwarding rule, to send the data in the second data packet to the second terminal device, and the processing module for modifying the destination address of the second data packet to the address of the second terminal device.
A communication device for data packet transmission, characterized in that the communication device comprises:

a receiving module, configured to acquire the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device;

a processing module, configured to generate a forwarding rule according to the serial number information of the first terminal device, the serial number information of the second terminal device, the address of the first terminal device and the address of the second terminal device, the forwarding The rule is used to modify the destination address of the first data packet;

A sending module, configured to send the forwarding rule to the user plane function device.
The communication device according to claim 20, wherein the receiving module is configured to acquire serial number information of the first terminal device, serial number information of the second terminal device, the serial number information of the second terminal device, and the The address of the first terminal device and the address of the second terminal device.
The communication device according to claim 20, wherein the receiving module is configured to obtain the serial number information of the first terminal device and the address of the first terminal device from the first terminal device through the user plane function device, Acquire the serial number information of the second terminal device and the address of the second terminal device from the second terminal device.
The communication device according to any one of claims 20 to 22, wherein the sending module is configured to send the serial number information of the first terminal device, the serial number information of the second terminal device, the serial number information of the second terminal device to the unified data management device The identifier of the first terminal device and the identifier of the second terminal device, the serial number information of the first terminal device, the serial number information of the second terminal device, the identifier of the first terminal device and the second terminal device The identification of the device is used for creating or updating a virtual network group, and the virtual network group includes the first terminal device and the second terminal device.
The communication apparatus according to claim 20, wherein the receiving module is configured to acquire serial number information of the first terminal equipment, serial number information of the second terminal equipment, and serial number information of the first terminal equipment from the unified data management apparatus address and the address of the second terminal device.
A communication device, comprising a processor;

The processor is configured to read and execute a program from the memory to implement the method of any one of claims 1 to 7.
A communication device, comprising a processor;

The processor is adapted to read and run a program from the memory to implement the method of any one of claims 8 to 13.
A communication system, characterized in that it includes a user plane function device and a session management function device, the user plane function device is configured to execute the method according to any one of claims 1 to 7, and the session management function device For carrying out the method of any one of claims 8 to 13.
A computer program product comprising instructions which, when run on a computer, cause the computer to perform a method as claimed in any one of claims 1 to 13.
A computer-readable storage medium having stored therein instructions that, when run on a computer, cause a processor to perform the method of any one of claims 1 to 13.