With the emergence of digital transformation needs, large-scale deterministic networking has become inevitable

The development of emerging technologies such as industry 4.0, intelligent manufacturing, autonomous driving, telemedicine, virtual reality (VR) and augmented Reality (AR) puts forward higher requirements for real-time performance, reliability and Quality of Service (QoS) of networks. Deterministic networks that can provide ultra-low delay, ultra-low jitter and ultra-high reliability emerge as The Times require to ensure the stable operation of these applications. At the same time, with the emergence of digital transformation needs in all walks of life, large-scale deterministic networking has become inevitable.

The innovative EDN system guarantees the certainty of resources, routing and time of large-scale networks

Zte believes that large-scale deterministic refers to supporting millions of data flows (such as massive industrial controls and sensors) on the IP network with a huge number of devices, and having the ability to guarantee deterministic service, delay and jitter can strictly bounded the service requirements. Large-scale deterministic networking will gradually show three typical characteristics, which are the increase of the scale of deterministic networking, the continuous increase of the number of deterministic connections, and the diversification of the types and mechanisms of deterministic connections. In response to these challenges, ZTE innovates to propose the EDN(Enhanced Deterministic Networking) system to solve the problem of heterogeneous, cross-layer and cross-domain classified and graded diversified services accurately and comprehensively carrying in large-scale deterministic networking. From the three dimensions of resource certainty, routing certainty and time certainty, the EDN system systematically realizes the technological innovation of control plane and forwarding plane in the field of large-scale deterministic carrying network. "Resource determinism" is the basis of EDN system. By planning network resources with deterministic ability, a unified modeling of deterministic resources is carried out, and an enhanced deterministic link is formed to solve the differences in resources such as multiple forwarding and queuing mechanisms. "Routing certainty" constructs guarantee paths with certainty ability, computes and schedules the guarantee paths based on the deterministic links modeled by the resource layer, and issues intra-domain or cross-domain deterministic routes to provide deterministic carrying capacity. "Time deterministic" provides an end-to-end deterministic service that meets the diverse needs of business. By planning the traffic characteristics of the business flow, it does traffic supervision at the entry node, identifies the deterministic QoS according to the classification and classification requirements of the business, maps the business to different resources and routes for forwarding, and realizes the classification and classification scheduling of business.

Equipped with the industry's first built-in EDN function chip, ZTE's IP network has superior deterministic performance

In the current time window of building 400GE carrying network, ZTE launches a new generation of chips and products with future evolution, which can provide large-capacity deterministic services on large-scale wide-area network to meet the development needs of future business. The new six-in-one network processing chip with built-in EDN solution is the industry's first chip to implement a wide-area deterministic network solution. Combined with the original TQF mechanism and Deadline mechanism, high-speed forwarding and deterministic guarantee can be achieved simultaneously on 400GE/800GE ports. The TQF mechanism uses time division multiplexing to establish a virtual container queue in the packet forwarding architecture, and supports different slot container particles according to the service requirements. The control plane supports global slot scheduling according to the service requirements to meet the deterministic requirements of different services for delay and jitter, and the forwarding plane supports forwarding scheduling based on slot identification. Intermediate nodes do not need to maintain the state of the traffic flow, and have the ability to support large-scale deterministic networks. The Deadline mechanism constructs a dynamic priority rotation queue according to the authorization deadline, dynamically assigns priority queues according to the authorization deadline, and supports multiple forwarding modes of upper delay and jitter compensation according to the service requirements. Intermediate nodes do not need to maintain the state of the traffic flow, which meets the diverse delay and jitter control requirements of large-scale deterministic networks. TQF is similar to the precise scheduling of high-speed rail, which performs accurate end-to-end scheduling according to user needs, and automatically completes the transfer according to the scheduling schedule after the user gets on the bus with one ticket. Deadline is similar to ticket checking when transferring, and priority transfer can be given according to the urgency of different tickets. Through the above algorithm and the innovative scheduling mechanism, the micro-burst and long-tail effect of IP forwarding are eliminated by controlling the forwarding time in each hop of the router, and the end-to-end delay and jitter bounded guarantee are achieved, and the ability of large-scale deployment is achieved. Compared with other products that do not support large-scale deterministic, they will be replaced and upgraded in the face of future business development. Zte's 400GE/800GE deterministic routers with built-in EDN scheme can better protect operators' investment and better cope with future uncertain changes.

Deepen the research on deterministic technology system and promote the digital transformation of the industry

EDN system has become the latest hot topic. Up to now, ZTE has jointly promoted more than 20 standard drafts including EDN requirements, architecture, data plane encapsulation, queuing mechanism, TE and control plane protocol extension in multiple IETF working groups, which have received great attention and recognition. In the future, ZTE will continue to deepen the research on deterministic technology system, promote the development and application of deterministic network technology, promote the digital transformation of related industries, promote the development of new business forms and models through industrial alliances and ecological cooperation, and jointly build a smart new world of interconnection of everything.