SDN (Software Defined Network) multi-access interconnection architecture system for complex industrial scene

Abstract

The invention relates to the technical field of industrial internet, in particular to an SDN (Software Defined Network) multi-access interconnection architecture system for a complex industrial scene. Comprising a multi-access field layer module, a multi-access service flow control layer module, an SDN (Software Defined Network) exchange layer module and a unified management and control platform, an extensible protocol rule base is arranged in the multi-protocol analysis interconnection terminal, dynamic analysis and fusion of 10 + industrial protocols such as Modbus, Profinet and EtherCAT are supported, protocol islands are eliminated, hot plug updating of protocol description files is supported, and newly-added protocols do not need to be upgraded in a shutdown mode; the semantic mapping engine converts original data into standardized semantic information through a knowledge graph to realize cross-protocol data intercommunication; compared with a traditional gateway which needs to deploy independent equipment for each type of protocols, the method can process multiple protocols, the hardware cost is reduced by 60%, and the deployment efficiency is improved by three times.

Description

Technical Field

[0001] The present invention relates to the field of industrial Internet technology, and in particular to an SDN multi-access interconnection architecture system for complex industrial scenarios. Background Art

[0002] With the rapid development of the industrial Internet and intelligent manufacturing, the challenges of integrating multiple devices, multiple protocols, multiple business flows, and heterogeneous networks in complex industrial scenarios such as smart textiles and lithium battery equipment manufacturing are becoming increasingly prominent. The Software Defined Network (SDN) industrial interconnection architecture combines advanced technologies such as the Internet of Things (IoT), big data, cloud computing, and artificial intelligence (AI) with traditional industrial systems through the separation and optimization of the data and control layers, achieving comprehensive interconnection of equipment, production lines, factories, supply chains, and products, thereby improving production efficiency, reducing operating costs, and optimizing resource allocation. However, the traditional SDN interconnection architecture has deficiencies in transmission efficiency and stability, making it difficult to meet the requirements of real-time, reliability, and intelligence. The existing technology has the following shortcomings:

[0003] 1. Industrial sites use multiple protocols, including Modbus, Profinet, and EtherCAT. Traditional gateways rely on multiple independent devices for protocol conversion, leading to "protocol islands" and increasing transmission latency and operation and maintenance costs.

[0004] 2. Distributed protocol conversion nodes lead to redundant data flow paths, and cross-protocol transmission delays generally exceed 80ms, making it difficult to meet real-time control requirements.

[0005] 3. The traditional layered architecture lacks a unified control plane and cannot dynamically respond to changes in service flow priorities. When the network is congested, the packet loss rate can reach over 5%.

[0006] 4. When large-scale devices are connected, the traditional network topology is rigid and difficult to support dynamic node addition and reduction and link redundancy.

[0007] Existing patent CN115022417A discloses a multi-protocol conversion gateway, but it relies on a fixed rule base and cannot dynamically adapt to new protocols. Separately, patent CN119449610A discloses a hierarchical control network architecture and multi-domain resource collaborative management method based on industrial SDN, allowing for dynamic adjustment of SDN controllers based on actual needs in complex industrial environments. However, this network architecture deploys SDN controllers at different levels and requires the use of industrial cloud resources. The system is complex and costly to build, making it unsuitable for small and medium-sized complex industrial production scenarios.

[0008] Therefore, this application proposes an SDN multi-access interconnection architecture system for complex industrial scenarios. Summary of the Invention

[0009] In order to make up for the deficiencies of the existing technology and solve the technical problems existing in the background technology, the present invention proposes an SDN multi-access interconnection architecture system for complex industrial scenarios.

[0010] The present invention is achieved through the following technical solutions:

[0011] An SDN multi-access interconnection architecture system for complex industrial scenarios, including:

[0012] Multi-access field layer module, which consists of a multi-protocol analysis interconnection terminal, supports industrial bus protocols RS485, CAN bus, and industrial Ethernet interface, and is used to achieve access to heterogeneous industrial equipment, multi-protocol analysis and standardized data encapsulation, and convert original protocol data into standardized business flows in a unified format;

[0013] A multi-access service flow control layer module, which includes a cluster of SDN controllers deployed in active-standby mode and a service flow management engine. It implements end-to-end transmission across heterogeneous networks by issuing dynamic flow tables. In combination with a link status monitoring module, it perceives the network topology in real time and dynamically generates routing strategies that meet latency, bandwidth, and packet loss rate constraints.

[0014] Use active / standby mode deployment to ensure high availability of the control plane;

[0015] An SDN switching layer module, comprising a cluster of industrial-grade SDN switches supporting the OpenFlow protocol, implementing data plane message forwarding based on the OpenFlow protocol, and receiving flow table rules issued by the multi-access service flow control layer;

[0016] A unified management and control platform provides a human-computer interaction interface and supports network configuration, fault alarms, and performance analysis.

[0017] Preferably, the multi-protocol analysis interconnection terminal is deployed on the edge side of the industrial equipment, and the multi-protocol analysis interconnection terminal includes a multi-protocol analysis mechanism that integrates a high-speed acquisition module, a protocol matching module, and a process data extraction module to speed up the analysis speed and thus improve the transmission efficiency of the underlying complex tasks, and can reduce the uncertainty of business traffic characteristics, improve the accuracy of upper-layer traffic classification applications, and promote the overall transmission performance improvement.

[0018] Multi-protocol parsing terminals are deployed at the edge of industrial equipment to achieve protocol conversion and data standardization.

[0019] Preferably, the communication interface in the high-speed acquisition module includes at least 2 RS485, 1 CAN bus and 2 10 / 100M Ethernet Profinet and EtherCAT interfaces, supporting multi-protocol parallel acquisition, caching, parsing and data forwarding;

[0020] The protocol matching module includes a protocol rule base, a field structure storing Modbus, Profinet, and EtherCAT industrial protocols, verification rules, and a semantic mapping template;

[0021] The process data extraction module converts the parsed protocol data into an industrial semantic data packet in a unified format based on a semantic mapping model.

[0022] Preferably, the dynamic scheduling strategy of the service flow management engine includes:

[0023] High-priority service flows: allocate low-latency paths and limit link bandwidth occupancy to ≤ 70%;

[0024] Low-priority service flows: select high-bandwidth paths, allowing link bandwidth occupancy to be ≥ 90%;

[0025] Fault recovery mechanism: After detecting a link interruption, it switches to an alternative path within 50ms.

[0026] Preferably, the cluster of industrial-grade SDN switches is constructed as a ring or star topology and supports OpenFlow 1.3 and above.

[0027] Industrial-grade SDN switches support time-sensitive networking (TSN) features, reserve deterministic transmission channels for high-priority service flows, and configure redundant links to achieve fault tolerance and self-healing of network topologies.

[0028] Preferably, the SDN controller further includes:

[0029] A protocol adapter plug-in module that parses industrial protocol header information, including Modbus function codes and Profinet periodic data identifiers;

[0030] The unified management and control interface module provides web-based network topology visualization, traffic statistics and policy configuration functions.

[0031] Preferably, the SDN gateway application architecture composed of the SDN controller and the service flow management engine includes a service flow extraction module, a QoS demand classification module, an adaptive routing allocation module and an SDN switching layer network status monitoring module.

[0032] Preferably, the service flow management engine classifies service types according to QoS levels, calculates the optimal transmission path in real time and generates flow table rules.

[0033] Preferably, the QoS demand classification module and the adaptive routing allocation module respectively deploy a traffic classification algorithm and a QoS adaptive routing method to implement routing optimization based on traffic classification;

[0034] The SDN switching layer network status monitoring module obtains port statistics through the Port-Stats message of the OpenFlow protocol, calculates the link packet loss rate and load balancing coefficient, and feeds back to the SDN controller to optimize the routing strategy.

[0035] Prioritizing, the system supports dynamic expansion of more than 1,000 network nodes, with end-to-end transmission delay ≤50ms and packet loss rate ≤0.1%, making it suitable for multi-device collaboration and real-time control in textile production lines and lithium battery manufacturing scenarios.

[0036] The beneficial effects of the present invention are:

[0037] 1. The multi-protocol parsing interconnection terminal of the present invention has a built-in expandable protocol rule base, supports dynamic parsing and integration of more than 10 industrial protocols such as Modbus, Profinet, EtherCAT, etc., eliminates "protocol islands", supports hot-swap updates of protocol description files, and new protocols do not need to be upgraded without downtime; the semantic mapping engine converts raw data into standardized semantic information through knowledge graphs to achieve cross-protocol data interoperability; compared with traditional gateways that require independent equipment for each type of protocol, the present invention can handle multiple protocols, reduce hardware costs by 60%, and increase deployment efficiency by 3 times.

[0038] 2. The present invention optimizes the SDN switching layer. The industrial-grade switch supports TSN features, reserves deterministic transmission channels for high-priority traffic, ensures delay-sensitive services, and adopts a ring or dual-star topology to configure redundant links. At the same time, the network status monitoring module uses Open Flow Port-Stats messages to sense link interruptions in real time, triggering flow table redirection, and achieving a delay of ≤50ms for switching to the backup path when a single link fails, ensuring the continuity of critical services.

[0039] 3. The present invention uses SDN centralized control. The controller will automatically discover new access devices and assign logical addresses without manual configuration. At the same time, the service flow management engine dynamically adjusts the flow table size and path calculation granularity according to the number of nodes, and calculates the optimal path in real time according to the link load to avoid congestion. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is the overall design diagram of SDN multi-access interconnection architecture;

[0041] Figure 2 It is the overall design diagram of the multi-protocol analysis mechanism;

[0042] Figure 3 This is a diagram of the hardware structure of the multi-protocol analysis terminal;

[0043] Figure 4 This is the overall schematic diagram of the SDN gateway application system. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the invention. The experimental methods in the following examples, for which specific conditions are not specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0045] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. The reagents or raw materials used in the present invention can be purchased through conventional channels. Unless otherwise specified, the reagents or raw materials used in the present invention are used in a conventional manner in the art or in accordance with the product instructions. In addition, any method and material similar to or equivalent to the described content can be applied to the method of the present invention. The present invention is further described with reference to the accompanying drawings and specific embodiments. The preferred embodiments and materials described in the present invention are for demonstration purposes only.

[0046] like Figure 1 As shown, the SDN multi-access interconnection architecture system includes a multi-access field layer module, an SDN switching layer module, and a multi-access service flow control layer module.

[0047] The multi-access field layer module includes an industrial control system composed of various sensors, controllers, actuators, PLCs, etc. and a multi-protocol analysis interconnection terminal.

[0048] Industrial controllers and PLCs communicate with the underlying equipment of industrial control systems through various industrial buses and connect to multi-protocol analysis and interconnection terminals.

[0049] The multi-protocol analysis interconnection terminal is responsible for collecting industrial sensor information and equipment operation information, performing multi-protocol analysis and transmitting it to the SDN switch for data transmission and exchange.

[0050] The multi-access field layer module also includes other industrial field equipment such as interactive platforms, equipment monitoring platforms, and computing centers. The multi-protocol parsing interconnect terminal implements a multi-protocol parsing mechanism using a combination of rule base matching and semantic parsing. This accelerates parsing, thereby improving the transmission efficiency of complex underlying tasks. It also reduces the uncertainty of service traffic characteristics, enhances the accuracy of upper-layer traffic classification applications, and promotes overall transmission performance improvements.

[0051] The SDN switching layer module is composed of SDN switches, which are mainly used for link layer message forwarding. According to the forwarding flow table issued by the SDN gateway, it communicates and transmits the data transmitted by the multi-access field layer at the data link layer of the industrial network, and receives SDN switching layer network status monitoring from the SDN gateway.

[0052] The multi-access service flow control layer module uses real-time monitoring of links and classification of service flows to perform dynamic routing optimization, alleviate load pressure, and reduce transmission delay.

[0053] In addition to fulfilling the flow table distribution function of the SDN controller in the traditional SDN architecture, the SDN gateway also integrates a complete routing scheduling method, including service traffic extraction, SDN switching layer network status monitoring, and routing optimization algorithm implementation. On this basis, it optimizes the overall routing transmission for complex industrial scenarios, improving efficiency and stability.

[0054] like Figure 2 As shown in FIG, the multi-protocol parsing mechanism includes a high-speed acquisition module, an industrial protocol matching module, and a process data extraction module.

[0055] The high-speed acquisition module is the prerequisite for ensuring the real-time performance of multi-protocol analysis technology, and is mainly used to cache the data to be analyzed and the protocol to be converted.

[0056] The industrial protocol matching module is responsible for matching protocol packets and using corresponding methods to deconstruct protocol packets, improving the accuracy and precision of the analysis. It also provides protocol filtering rules and protocol stack deconstruction rules for industrial control protocols in conjunction with the protocol rule library.

[0057] The process data extraction module further parses and organizes application layer data and related network data, using a unified semantic mapping transmission method to ensure accuracy while reducing the time and resource loss of protocol conversion and calculation.

[0058] like Figure 3 As shown in the figure, the multi-protocol analysis interconnection terminal uses Rockchip RV1103 as the main controller to meet the computing power requirements; Ethernet, RS485, RS232, and wireless module multi-type communication interfaces are designed to meet the multi-access requirements of the protocol; a Linux system is built, and an external 8GB external storage is connected to meet the needs of multi-process scheduling and large-capacity storage of the multi-protocol analysis mechanism.

[0059] like Figure 4 As shown in the figure, the SDN gateway application system is divided into four parts: service traffic extraction module, QoS demand classification module, adaptive routing allocation module, and SDN switching layer network status monitoring module.

[0060] The service flow extraction module is responsible for extracting traffic information from the transmission service flow of the SDN switching layer. It can use the packet_in message to obtain the traffic information of the requested route and expand the features. Its focus is on extracting the characteristics of the service flow so that it can be submitted to the QoS requirement classification module for classification.

[0061] When a data flow enters the SDN switch in the SDN switching layer, since there is no flow table matching the message, the SDN switch will encapsulate it as a packet_in message and send it to the SDN gateway, transferring the control of the data packet to the SDN gateway.

[0062] After the SDN gateway makes a routing decision, it sends a packet_out message to process the routing of the forwarded data packet.

[0063] The QoS requirement classification module classifies QoS requirements based on the traffic information extracted by the service traffic extraction module and the traffic classification algorithm.

[0064] The SDN switching layer network status monitoring module mainly collects status information in the link layer based on the OpenFlow protocol under the SDN architecture to provide support for QoS adaptive routing allocation.

[0065] After completing the service flow classification, QoS will optimize the route according to the QoS requirements of the corresponding traffic and the current link status information.

[0066] Therefore, before executing QoS route optimization, the SDN gateway measures actual link latency, link bandwidth, and link packet loss rate. With real-time monitoring of the SDN switch layer's network status within the main process, the adaptive route allocation module can more accurately utilize this information to calculate routes that meet QoS requirements and minimize resource consumption. Finally, the SDN gateway uses the flow_mod message in the OpenFlow protocol to send the flow table to the SDN switch at the link layer, completing the route optimization.

[0067] Any matters not described in the present invention are applicable to the prior art.

Claims

1. An SDN multi-access interconnection architecture system for complex industrial scenarios, characterized by: include: Multi-access field layer module, which consists of a multi-protocol analysis interconnection terminal, supports industrial bus protocols RS485, CAN bus, and industrial Ethernet interface, and is used to achieve access to heterogeneous industrial equipment, multi-protocol analysis and standardized data encapsulation, and convert original protocol data into standardized business flows in a unified format; A multi-access service flow control layer module, which includes a cluster of SDN controllers deployed in active-standby mode and a service flow management engine. It implements end-to-end transmission across heterogeneous networks by issuing dynamic flow tables. In combination with a link status monitoring module, it perceives the network topology in real time and dynamically generates routing strategies that meet latency, bandwidth, and packet loss rate constraints. An SDN switching layer module, comprising a cluster of industrial-grade SDN switches supporting the OpenFlow protocol, implementing data plane message forwarding based on the OpenFlow protocol, and receiving flow table rules issued by the multi-access service flow control layer; A unified management and control platform provides a human-computer interaction interface and supports network configuration, fault alarms, and performance analysis.

2. The SDN multi-access interconnection architecture system for complex industrial scenarios according to claim 1 is characterized in that: The multi-protocol analysis interconnection terminal is deployed on the edge side of the industrial equipment, and the multi-protocol analysis interconnection terminal includes a multi-protocol analysis mechanism that integrates a high-speed acquisition module, a protocol matching module and a process data extraction module.

3. The SDN multi-access interconnection architecture system for complex industrial scenarios according to claim 2 is characterized in that: The communication interface in the high-speed acquisition module includes at least 2 RS485, 1 CAN bus and 2 10 / 100M Ethernet Profinet and EtherCAT interfaces, supporting multi-protocol parallel acquisition, caching, parsing and data forwarding; The protocol matching module includes a protocol rule base, a field structure storing Modbus, Profinet, and EtherCAT industrial protocols, verification rules, and a semantic mapping template; The process data extraction module converts the parsed protocol data into an industrial semantic data packet in a unified format based on a semantic mapping model.

4. The SDN multi-access interconnection architecture system for complex industrial scenarios according to claim 1 is characterized in that: The dynamic scheduling strategy of the business flow management engine includes: High-priority service flows: allocate low-latency paths and limit link bandwidth occupancy to ≤ 70%; Low-priority service flows: select high-bandwidth paths, allowing link bandwidth occupancy to be ≥ 90%; Fault recovery mechanism: After detecting a link interruption, it switches to an alternative path within 50ms.

5. The SDN multi-access interconnection architecture system for complex industrial scenarios according to claim 4 is characterized in that: The cluster of industrial-grade SDN switches is constructed in a ring or star topology and supports OpenFlow 1.3 and above.

6. The SDN multi-access interconnection architecture system for complex industrial scenarios according to claim 5, characterized in that: The SDN controller further includes: A protocol adapter plug-in module that parses industrial protocol header information, including Modbus function codes and Profinet periodic data identifiers; The unified management and control interface module provides web-based network topology visualization, traffic statistics and policy configuration functions.

7. The SDN multi-access interconnection architecture system for complex industrial scenarios according to claim 1 is characterized in that: The SDN gateway application architecture composed of the SDN controller and the service flow management engine includes a service flow extraction module, a QoS demand classification module, an adaptive routing allocation module and an SDN switching layer network status monitoring module.

8. The SDN multi-access interconnection architecture system for complex industrial scenarios according to claim 7, characterized in that: The service flow management engine divides service types according to QoS levels, calculates the optimal transmission path in real time and generates flow table rules.

9. The SDN multi-access interconnection architecture system for complex industrial scenarios according to claim 7, characterized in that: The QoS demand classification module and the adaptive routing allocation module respectively deploy a traffic classification algorithm and a QoS adaptive routing method to achieve routing optimization based on traffic classification; The SDN switching layer network status monitoring module obtains port statistics through the Port-Stats message of the OpenFlow protocol, calculates the link packet loss rate and load balancing coefficient, and feeds back to the SDN controller to optimize the routing strategy.

10. The SDN multi-access interconnection architecture system for complex industrial scenarios according to claim 1, characterized in that: End-to-end transmission delay ≤50ms, packet loss rate ≤0.1%.

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