Today, at the 2020 ODC, Wei Leping, director of the Science and Technology Committee of China Telecom Group Corporation, delivered a keynote speech on “Cloudification and All-optical Trends of Networks”. He said that cloud-network integration is the general direction and the latest frontier of the telecom industry’s deepening transformation and technological innovation. Through the expansion of cloud-network integration, the industry chain will become stronger and support the further sustainable development of the telecom industry. A solid base for mesh fusion.

Cloud-network integration is a new opportunity for operators to develop

In recent years, cloud computing and the network have penetrated each other, enabling the deep integration of communication technology and information technology, and cloud-network integration is becoming the main theme. According to Wei Leping, the ultimate goal of cloud-network integration is to form an integrated supply: unified definition, encapsulation and arrangement of network resources and cloud resources; integrated operation: global resource perception, consistent quality assurance, integrated planning and operation and maintenance management; integrated Service: unified acceptance, unified delivery, and unified presentation of cloud and network services.

Wei Leping emphasized that cloud-network integration cannot be achieved overnight, but needs to start from four dimensions: resources and data, operation management and business services, and capability openness, and go through three development stages of collaboration, integration, and integration. Network integration.

Collaboration stage (2020-2022), cloud-network infrastructure layer “connection”, automatic service provisioning and loading, one-stop cloud-network ordering; integration stage (2023-2027), logical architecture and common components converge, resources and capabilities “physically” “Reaction”, unified distribution and scheduling of cloud and network; integration stage (2028-2030), breaking the boundaries of cloud and network technology, physical and logical layers “chemical reaction”, cloud and network resources and services become standard parts of the digital platform.

Subsequently, Wei Leping introduced the opportunities and advantages of operators under the general trend of cloud-network integration. In terms of resource advantages, operators have precious spectrum, numbers and scarce resources such as thousands of access offices. In terms of user advantages, it has a huge user base and masters complete and controllable user information.

More importantly, in terms of network and IT advantages, having a ubiquitous network and a large number of DCs can effectively integrate expensive bandwidth, computing and storage resources and reduce overall costs. With control over network and IT resources, cloud services can be effectively allocated, and the service availability, real-time, security, and latency performance should be better. With the control of cloud network resources, it is expected to provide stricter cloud network SLAs and innovative services and technical forms, such as cloud network operating systems, cloud network slicing, etc.

All-optical network is the base of cloud-network integration

In Wei Leping’s view, the huge available spectrum (10THz), ultra-large-capacity link (100Tbps), ultra-high speed (1Tbps), and ultra-large-capacity node (Pbps) of the all-optical network are the most ideal bearer network bases for cloud-network integration.

Wei Leping pointed out that the evolution of the all-optical network is divided into three steps: the first step: fiber-optic transmission links. At present, all transmissions have been fiber-based, and the rate is evolving to 200-400Gbps; the second step: access network fiber-optic , is currently promoting the optical fiberization of wiring sections and incoming lines, and even houses and desktops. It has entered the stage of tackling tough battles, and optical advances and copper retreats are still on the way; the third step: optical switching of transmission nodes, CTC backbone network will fully deploy ROADM network before the end of the year , form the backbone all-optical network 2.0, and continue to extend to the metropolitan area network and even the access network.

However, at present, the all-optical network still faces some challenges. On the one hand, the optical layer networking range is limited, with 80% of the circuits over 1,000 kilometers across the inter-provincial trunk line, and most circuits cannot be directly connected to the optical layer. Currently, they are only suitable for metropolitan area networks and regional trunk networks. On the other hand, the national networking has yet to be developed. Layer control system. On the other hand, the dimension and capacity of ROADM nodes in the backbone network need to be continuously improved. Due to the large number of lines in large nodes, multiple parallel nodes, waste of interfaces, and large footprint, it is necessary to develop a 32-dimensional or even 64-dimensional ROADM based on optical backplanes.

In addition, a centralized calculation path needs to be introduced to avoid wavelength conflicts and reduce recovery time. MAN access optical nodes need to significantly reduce complexity and cost. Network planning and O&M support tools are yet to be optimized and standardized. Network automation still needs the deep application of ML/DL. In addition, the introduction of SDN is expected to make the best use of the entire network bandwidth resources, shorten the convergence speed, and reduce the delay. SDN can also obtain the service path with the shortest delay according to the reported link status.

However, Wei Leping pointed out that with the centralized control of SDN, although the operation and maintenance efficiency can be greatly improved, the establishment/removal of the optical path must rely on manual instructions, and it is difficult to achieve active network reconstruction and active operation and maintenance. Therefore, the all-optical network still needs to move towards the cognitive optical network. Wei Leping introduced that the cognitive optical network (CON) is a new generation of intelligent optical network based on machine learning, which can perceive the external environment and understand and learn from the external environment. Real-time adjustment of network configuration, intelligent adaptation to changes in the external environment.

After the introduction of the cognitive optical network, not only can the optical network configuration be automatically optimized, but also the optical signal-to-noise ratio can be improved, the quality of the optical path can be predicted, the recovery time of the optical layer can be reduced, the self-optimized switching of different modulation methods can be realized, and the overall quality of the all-optical network can be improved. .

At present, China Telecom’s all-optical backbone network 2.0 has the largest coverage and scale in the world, with 470 ROADM nodes and a total network capacity of 620T; the architecture is flat, and the integration of primary and secondary trunk lines is realized; WSON optical layer recovery and dynamic rerouting are enabled, and the recovery time Less than 2 minutes; 20/32-dimensional WSS-based CD-dominated; end-to-end optical layer direct access with low latency; ultra-long boards are used to reduce relays; and multi-function boards and super controllers are enabled. Looking forward to the future, the goal is to achieve minute-level distribution, second-level priority recovery, 30-millisecond delay, and automatic topology discovery and route selection.

Responsible editor: gt

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