Industrial Internet Oriented 5G TSN Practice and Prospect
Introduction:
With the commercial deployment of 5G networks, the Industrial Internet, as an important area of 5G ToB applications, has entered a period of rapid development driven by industry digital transformation and Industry 4.0. As the core field of the Industrial Internet, the production puts forward higher requirements for the real-time and deterministic network connection, including ultra-low latency, ultra-low jitter, and highly reliable transmission links. The integration of 5G and TS can provide deterministic services with millisecond-level transmission delay and microsecond-level jitter, meeting the real-time requirements of existing major production industries, and has attracted great attention from the industry.
In order to promote the integrated development of 5G and Industrial Internet, ZTE and China Mobile Research Institute, together with industry customers and terminal manufacturers, have conducted in-depth exploration and practice of 5G TSN end-to-end solutions in industrial Internet scenarios. The practice in the power grid differential protection, intelligent PLC real-time control and other aspects have achieved good results and provided strong support for the in-depth development of 5G + industrial
Internet.
This white paper aims to promote the industry’s understanding of 5G TSN-related standards, architecture, key technologies and development trends, and to provide reference for the technological innovation, experimental verification, and application practice of 5G TN in the industrial Internet scenario, so as to jointly promote 5G TN in the field of industrial production, fully empower the industrial Internet and the digital transformation of the industry, and creates a new blue ocean of value.
Written by: ZTE, China Mobile Research Institute
To ensure accurate determination of differential protection and timely startup, it is necessary to ensure that a group of differential current is sampled at the same time, that is, time synchronization of differential current must be strictly ensured. Therefore, differential protection requires high communication delay and reliability among DTUs (delay: less than 10ms, time synchronization accuracy: less than 10us, reliability: more than 99.999%). To achieve power distribution differential protection, a communication network needs to be deployed among the differential protection devices of adjacent power distribution stations. However, due to the large number of terminals for differential protection and scattered deployment, when dedicated optical fiber lines are used for deployment, the costs are high and it is difficult to meet the increasing access requirements.
The low latency, high reliability and massive connections of 5G network can meet the above requirements. 5G TN provides precise and reliable network transmission capability to meet the requirements of differential protection for communication delay. Combined with the dedicated network service capability such as 5G LAN, the strict security isolation requirements of the power grid are also satisfied. Therefore, 5G networks are used to replace optical fiber transmission, and 5G private network technologies are used to flexibly deploy terminals, reducing deployment costs and guaranteeing transmission delay. In addition, a large number of differential protection terminals deployed in distributed mode can be accurately controlled and managed. Therefore, China Mobile, together with ZTE and NR Electric, jointly released the industry’s first E2E 5G TS deterministic network, verifying the services such as grid differential protection and achieving good results.
5G TSN + PLC Industrial Automation Solution Practice Architecture
By reconstructing the existing on-site cabinets, UE/DS-TT and TSN switches are added to work together with the servos and drives in the on-site cabinet for on-site motion control of industrial automation.
Integrated cloud-network cabinets are deployed at the network side. 5G Grand Master and 1588 Grand Master (using the same physical equipment), BBU (DU+CU), transmission equipment (SPN), core network equipment (AMF/SMF/UDM/PC/TSNAF), UPF/NW-TT, TSN switch and CNC.
Through network transformation, the PLC that was originally distributed in the on-site cabinet is deployed to the cloud-network cabinet in a centralized manner. The Grand Master that was distributed in the PLC is also deployed to the cloud network cabinet (which can serve as the Grand Master of 5G or the Grand Master in the OT domain). This not only saves the investment but also facilitates centralized management and maintenance of the network.
The innovative TSN switch supports interworking between 802.1AS and 1588, and meets the precision requirements of EtherNet/IP industrial standard Ethernet for network timing.
CNC is deployed in the cloud cabinet to automatically manage and configure TSN switches and 5G TSN bridge.
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