CN115226100A - Industry heterogeneous network edge gateway based on 5G - Google Patents

Industry heterogeneous network edge gateway based on 5G Download PDF

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Publication number
CN115226100A
CN115226100A CN202210826033.6A CN202210826033A CN115226100A CN 115226100 A CN115226100 A CN 115226100A CN 202210826033 A CN202210826033 A CN 202210826033A CN 115226100 A CN115226100 A CN 115226100A
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data
link
industrial
edge gateway
network
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Inventor
杜大军
陈清扬
王海宽
陈哲意
潘玉彪
赵祥材
侯维岩
费敏锐
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University of Shanghai for Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/03—Protecting confidentiality, e.g. by encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/22—Alternate routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2425—Traffic characterised by specific attributes, e.g. priority or QoS for supporting services specification, e.g. SLA
    • H04L47/2433—Allocation of priorities to traffic types
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/08—Protocols for interworking; Protocol conversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/12—Detection or prevention of fraud
    • H04W12/121—Wireless intrusion detection systems [WIDS]; Wireless intrusion prevention systems [WIPS]
    • H04W12/122—Counter-measures against attacks; Protection against rogue devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements

Abstract

The invention provides a 5G-based industrial heterogeneous network edge gateway, and relates to the technical field of industrial heterogeneous networks. The edge gateway is mainly used for cross-domain heterogeneous network communication, namely nodes under a local edge gateway and a remote edge gateway communicate with each other. The edge gateway comprises an equipment control management module, a network information management module, a protocol conversion module and a user data control module. The equipment control management module is responsible for establishing a communication relation between the downstream industrial nodes; the network information management module is responsible for collecting network security risks and network performance parameters and providing data basis for decision making of other modules; the protocol conversion module is responsible for receiving and extracting industrial message data and mapping memory addresses, packaging and sending messages; and the user data control module is responsible for carrying out redundant transmission of IP frames between edge gateways by using a wireless link based on 5G and an Ethernet wired link so as to ensure the reliability and the real-time performance of communication between industrial heterogeneous networks.

Description

Industry heterogeneous network edge gateway based on 5G
Technical Field
The invention relates to the technical field of industrial heterogeneous gateways, in particular to an industrial heterogeneous network edge gateway based on 5G.
Background
The industrial internet and industry 4.0 are important ways for the manufacturing industry to implement digital transformation. The industrial network is the basis of the industrial internet and generally consists of an industrial field network and an industrial backbone network. The industrial field network comprises an industrial wireless network and an industrial wired network and is used for completing information acquisition and decision control of the production process. The industrial backbone network is an important hub for connecting industrial production sites and the Internet. With the continuous development of the next generation internet technology, the application of 5G to the factory backbone network becomes an important development trend.
In order to meet the diversified demands of industrial production, an industrial network usually adopts a heterogeneous networking mode and is formed by mixing various industrial wired networks and wireless networks. Heterogeneity has become a significant feature of industrial networks. Under the heterogeneous environment, the device communication between different networks does not leave the protocol conversion device. In addition, control data in an industrial network needs highly reliable low-delay transmission, and the protocol conversion efficiency becomes a key factor for restricting end-to-end cross-network control. In order to realize efficient protocol conversion, transmission of heterogeneous industrial data in the internet is proposed, however, when data is transmitted in the internet, delay, packet loss and data leakage caused by network fluctuation, attack and the like are inevitable. Therefore, how to safely and stably transmit industrial heterogeneous network data is an important problem in industrial network development.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a 5G-based industrial heterogeneous network edge gateway which can support the high-efficiency intercommunication of cross-domain industrial heterogeneous networks, prevent network attacks by using methods such as identity authentication negotiation and data encryption and the like, and ensure the stability and high efficiency of cross-domain transmission by using 5G and Ethernet as redundant links.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: A5G-based industrial heterogeneous network edge gateway comprises an equipment control management module, a network information management module, a protocol conversion module and a user data control module;
the equipment control management module is responsible for establishing a communication relation between downstream industrial nodes;
the network information management module is responsible for collecting network security risk and network performance parameters and providing data basis for decision making of other modules;
the protocol conversion module is responsible for receiving and extracting industrial message data and mapping memory addresses, and packaging and sending messages;
the user data control module is responsible for carrying out redundant transmission of IP frames between edge gateways by using a wireless link based on 5G and an Ethernet wired link so as to ensure the reliability and the real-time performance of communication between industrial heterogeneous networks.
Preferably, the device control management module specifically includes:
the method comprises the following steps: the edge gateways at the local end and the far end acquire a downstream equipment list through equipment connection events;
step two: the edge gateways of the local and the far end establish a safety information channel through IPSec negotiation, and generate and exchange a key for subsequent data safety transmission;
step three: creating a first virtual subnet equipment and a second virtual subnet equipment by a manual setting or file import mode, wherein the first virtual subnet equipment is created by a far-end edge gateway and uses the same protocol with the downstream equipment of the local edge gateway; the second virtual subnet equipment is created by the local edge gateway and uses the same protocol with the downstream equipment of the remote edge gateway;
step four: and establishing communication examples at the local edge gateway and the far-end edge gateway, respectively informing the protocol conversion modules of the edge gateways at the two ends to establish corresponding protocol conversion processes and binding the protocol conversion processes to the communication examples.
Preferably, the network information management module mainly includes the following sub-functions:
1) Managing gateway port configuration: carrying out frame format and key element value check on a data frame uploaded by downstream equipment, executing forced disconnection action on the downstream equipment with the message error frequency exceeding a threshold value in an edge gateway port, and marking the port as an abnormal state;
2) Analyzing the network performance: periodically counting communication performance parameters of the edge gateway and the downstream equipment, including throughput, packet loss rate, delay and the like, and periodically calculating communication quality Q of the 5G link 5G Quality of communication Q with an ethernet link ETH Quality of link communication Q link The calculation method comprises the following steps:
Figure BDA0003744004910000031
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003744004910000032
and σ RTT Respectively mean value and variance of round-trip time of a plurality of ICMP frames in continuous time in a link, LOSS is packet LOSS rate of the ICMP frames, w a_delay 、w v_delay 、w r_loss The weights of the three indexes can be set according to industrial scenes.
Preferably, the protocol conversion module creates a protocol conversion process according to the device control management module, and performs priority classification on the messages received from downstream, specifically, by performing interface identification on downstream industrial devices and matching function code fields of data frames, data is divided into three priorities from high to low: processing command frames of network management control and emergency alarm, and processing process data, general data and non-emergency alarm data for industrial automatic production monitoring;
data needing protocol conversion sequentially enters a waiting area of a corresponding protocol conversion process according to the data priority, and the data waiting for overtime can temporarily improve the data priority in the process, so that the data with low data priority can be prevented from being processed all the time;
and the protocol conversion process carries out address and numerical value mapping between the industrial protocols needing to be converted and uses the protocol stack of the corresponding virtual subnet equipment to carry out data encapsulation and transmission.
Preferably, the redundant transmission module uses a 5G link and an ethernet link as a physical transmission link at the same time, the sender adds a data packet sequence number at the beginning of the IP frame load, and then encrypts data by using a key generated by the device control management module and applying an AES-256 algorithm when sending;
the receiving side receives the data of the 5G link and the Ethernet link in parallel, selects one link as a main link, only processes the data frame received from the main link under the common condition, and reads the data with the same serial number from the standby link as a substitute when the data frame transmitted by the main link is lost, disordered, checked, and the like;
using the ethernet link as the primary link for transmission by default, Q over 5 cycles 5G Are all greater than Q ETH And when the link is switched to be the main link, the link of the 5G is switched to be the standby link.
(III) advantageous effects
The invention provides an industrial heterogeneous network edge gateway based on 5G. The method has the following beneficial effects:
1. the invention protects the data communication by using the technologies of equipment identity authentication, data encryption and the like, and can prevent the industrial data from being attacked or stolen when the network is opened for transmission.
2. The invention classifies the data by using a priority marking method, and further provides the network resources and the storage and calculation resources of the industrial heterogeneous network edge gateway. Therefore, when the cross-network communication frequency of the data is high, the transmission real-time performance and reliability of the information carrying important production elements are preferentially ensured, and the stable operation of an industrial system is further ensured.
3. The invention uses two redundant physical links to transmit cross-network data, and establishes a reasonable backup link compensation mechanism and a main and standby link switching mechanism, when accidental data disorder and packet loss occur on one link, the backup link data can be called immediately for replacement, thereby greatly reducing the influence caused by accidental transmission errors. The reliability of cross-network convergence of the heterogeneous network is enhanced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
Fig. 1 is a schematic diagram of an edge gateway function module of a 5G-based industrial heterogeneous network according to the present invention;
fig. 2 is a schematic architecture diagram of an edge gateway of an industrial heterogeneous network based on 5G according to the present invention;
fig. 3 is a 5G-based data transmission path diagram of an edge gateway and an industrial node of an industrial heterogeneous network according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a data mapping area in a 5G-based industrial heterogeneous network edge gateway protocol conversion process according to the present invention.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Fig. 1 shows a schematic diagram of an edge gateway functional module of a 5G-based industrial heterogeneous network according to the present invention, where the edge gateway architecture includes the following functional modules: the device comprises a device control management module, a network information management module, a protocol conversion module and a user data control module. The equipment control management module is responsible for establishing a communication relation between downstream industrial nodes; the network information management module is responsible for collecting network security risk and network performance parameters and providing data basis for decision making of other modules; the protocol conversion module is responsible for receiving and extracting industrial message data and mapping memory addresses, packaging and sending messages; and the user data control module is responsible for carrying out redundant transmission of IP frames between edge gateways by using a wireless link based on 5G and an Ethernet wired link so as to ensure the reliability and the real-time performance of communication between industrial heterogeneous networks.
Fig. 2 shows a schematic architecture diagram of an industrial heterogeneous network edge gateway based on 5G according to the present invention, two industrial protocols to be converted are controlled and configured by a gateway configuration, the gateway collects network characteristics and industrial data characteristics of protocols on both sides, and necessary data is analyzed by a corresponding analysis module and provided to a security module and the gateway configuration, so as to optimize gateway protocol conversion and data transmission. In addition, the conversion strategy can be optimized by analyzing the protocol conversion model.
Example 1:
and the control of the CANopen slave station servo motor by the Modbus-TCP master station is realized.
Fig. 3 is a data transmission path diagram of a heterogeneous network edge gateway and an industrial node: for example, a Modbus-TCP master station host computer controls a mechanical arm of a CANopen slave station protocol, the Modbus-TCP master station node sends data to an edge gateway of a local area, the gateway packages the data into an IP frame and transmits the IP frame to a remote edge gateway through Ethernet and 5G, the remote edge gateway analyzes the data packet and performs protocol conversion, and then the data packet is forwarded to a CANopen slave station by using a virtual subnet node of the gateway.
The specific operation steps are as follows:
s1: configuring Modbus-TCP and CANopen virtual node communication parameters of the gateway, wherein the edge gateway directly connected with the CANopen is configured as follows:
Figure BDA0003744004910000061
edge gateway configuration for direct connection Modbus-TCP:
Figure BDA0003744004910000062
s2: and configuring a Modbus-TCP (transmission control protocol) master station and a CANopen slave station, wherein the Modbus-TCP master station is replaced by Modbus master station software. The CANopen slave station is configured using special configuration software. In this example, a PDO communication mode with higher real-time performance in the CANopen protocol is used because a servo motor needs to be controlled. The PDO parameter configuration comprises the following steps:
namely, CANopen needs to receive three parameters of control word, speed and mode.
Figure BDA0003744004910000071
S3: the parameters of the CANopen slave station servo motor are configured by using Modbus poll software:
firstly, configuring Modbus master station parameters:
slave station ID Function Address Quantity Scan Rate(ms)
5 03: read hold register 750 10 1000
The parameters to be configured are then written to the address:
for this example, it is necessary to write the control word 0x0F00 in the first register, then the velocity values in the second and third registers, and the velocity control pattern 0x0300 in the fourth register.
After the operation, the CANopen slave station servo motor under the gateway at the other end can rotate at a set speed.
After the above operation, the internal working steps of the gateway are as follows:
s1: the edge gateways at two sides acquire the key used when data is transmitted between the gateways through an identity authentication and negotiation mechanism. And communication channels are opened between the Modbus-TCP node and the CANopen node.
S2: and receiving a register writing instruction sent by Modbus pol from a Modbus-TCP virtual slave station node in the edge gateway.
S3: the edge gateway analyzes the Modbus-TCP message, firstly extracts characteristic information such as IP, equipment ID and the like of the Modbus-TCP message, simultaneously carries out flow sampling on a port of the gateway operating the Modbus-TCP protocol, and sends the acquired data characteristics into a priority classification model together to obtain the priority of the data frame.
S4: the edge gateway reads the register value information transmitted by the message and stores the register value information into the shared data area, and the stored information also comprises information of read-write attribute, data frame priority, data updating mode and the like of the data area.
S5: the edge gateway protocol conversion process converts the protocol into CANopen format according to the mapping table, including the conversion of address and index, and fills the data mapping area. The specific data map structure is shown in fig. 4.
S6: and the edge gateway at the side sends the packed data load to a corresponding port of the far-end edge gateway through the Ethernet card and the 5G wireless module and marks the same data sequence number.
S7: the sending submodule reads the complete items of the shared data area to construct an Ethernet data frame and a 5G data frame according to the content of the items, constructs a sending queue according to the priority information, and simultaneously sends the sending queue to a receiving end gateway through the Ethernet card and the 5G module. The receiving submodule periodically interacts ICMP frames with the edge gateway of the sending end to calculate link delay, and selects a link with higher communication quality as a channel for receiving and processing data. In order to ensure that the main link is not switched frequently, a timeout is set, and the switching is performed when the currently selected main link has higher delay. And finally, the receiving submodule analyzes the received data frame and transmits the data frame to the corresponding virtual subnet node.
S8: and the virtual CANopen master station node of the CANopen side gateway packs the data information into a CANopen packet and sends the CANopen packet to a CANopen slave station servo motor.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (5)

1. The industrial heterogeneous network edge gateway based on 5G is characterized by comprising an equipment control management module, a network information management module, a protocol conversion module and a user data control module;
the equipment control management module is responsible for establishing a communication relation between downstream industrial nodes;
the network information management module is responsible for collecting network security risks and network performance parameters and providing data basis for decision making of other modules;
the protocol conversion module is responsible for receiving and extracting industrial message data and mapping memory addresses, and packaging and sending messages;
the user data control module is responsible for carrying out redundant transmission of IP frames between edge gateways by using a wireless link based on 5G and an Ethernet wired link so as to ensure the reliability and the real-time performance of communication between industrial heterogeneous networks.
2. The 5G-based industrial heterogeneous network edge gateway according to claim 1, wherein the device control management module specifically comprises the following working steps:
the method comprises the following steps: the edge gateways at the local and remote ends acquire a downstream equipment list through equipment connection events;
step two: the edge gateways of the local and the far end establish a safety information channel through IPSec negotiation, and generate and exchange a key for subsequent data safety transmission;
step three: creating a first virtual subnet equipment and a second virtual subnet equipment by a manual setting or file import mode, wherein the first virtual subnet equipment is created by a far-end edge gateway and uses the same protocol with the downstream equipment of the local edge gateway; the second virtual subnet equipment is created by the local edge gateway and uses the same protocol with the downstream equipment of the remote edge gateway;
step four: and establishing communication examples at the local edge gateway and the far-end edge gateway, respectively informing the protocol conversion modules of the edge gateways at the two ends to establish corresponding protocol conversion processes and binding the protocol conversion processes to the communication examples.
3. The 5G-based industrial heterogeneous network edge gateway according to claim 1, wherein the network information management module mainly comprises the following sub-functions:
1) Managing gateway port configuration: carrying out frame format and key element value check on a data frame uploaded by downstream equipment, executing forced disconnection action on the downstream equipment with the message error frequency exceeding a threshold value in an edge gateway port, and marking the port as an abnormal state;
2) Analyzing the network performance: periodically counting communication performance parameters of the edge gateway and the downstream equipment, including throughput, packet loss rate, delay and the like, and periodically calculating communication quality Q of the 5G link 5G Quality of communication with an Ethernet link Q ETH Quality of link communication Q link The calculation method comprises the following steps:
Figure FDA0003744004900000021
wherein the content of the first and second substances,
Figure FDA0003744004900000022
and σ RTT Respectively mean value and variance of round-trip time of a plurality of ICMP frames in continuous time in a link, LOSS is packet LOSS rate of the ICMP frames, w a_delay 、w v_delay 、w r_loss The weights of the three indexes can be set according to industrial scenes.
4. The 5G-based industrial heterogeneous network edge gateway according to claim 1, wherein the protocol conversion module creates a protocol conversion process according to the device control management module, performs priority classification on the packets received from downstream, specifically, performs interface identification on downstream industrial devices, and performs function code field matching on data frames to classify data into three priorities from high to low: processing command frames of network management control and emergency alarm, and processing process data, general data and non-emergency alarm data for industrial automatic production monitoring;
data needing protocol conversion sequentially enters a waiting area of a corresponding protocol conversion process according to the data priority, and the data waiting for overtime can temporarily improve the data priority in the process, so that the data with low data priority can be prevented from being processed all the time;
and the protocol conversion process carries out address and numerical value mapping between the industrial protocols needing to be converted and uses the protocol stack of the corresponding virtual subnet equipment to carry out data encapsulation and transmission.
5. The 5G-based industrial heterogeneous network edge gateway according to claim 1, wherein the redundant transmission module uses a 5G link and an Ethernet link as physical transmission links at the same time, a sender adds a data packet sequence number at the beginning of an IP frame load, and then encrypts data by applying AES-256 algorithm using a key generated by the equipment control management module during sending;
the receiving side receives data of the 5G link and the Ethernet link in parallel, one link is selected as a main link, only the data frame received from the main link is processed under the general condition, and when the data frame transmitted by the main link is lost, out of order, wrong in check and the like, the data with the same serial number is read from the standby link to be used as a substitute;
using the ethernet link as the primary link for transmission by default, Q over 5 cycles 5G Are all greater than Q ETH And when the link is switched to be the main link, the link of the 5G is switched to be the standby link.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117234146A (en) * 2023-11-15 2023-12-15 北京科技大学 Cloud PLC multi-protocol I/O equipment remote control method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117234146A (en) * 2023-11-15 2023-12-15 北京科技大学 Cloud PLC multi-protocol I/O equipment remote control method and system
CN117234146B (en) * 2023-11-15 2024-02-27 北京科技大学 Cloud PLC multi-protocol I/O equipment remote control method and system

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