As the core carrying platform of national information infrastructure, optical fiber communication transmission network, with its super-large capacity, ultra-long distance and ultra-high reliability characteristics, undertakes more than 90% of the country's information transmission tasks, provides basic transmission channels and key support platforms for various business networks, and has become China's strategic information communication infrastructure. Once the network is attacked or malfunctioning, it will directly cause the service network transmission efficiency to plummet or even the system to break down, which will lead to significant social and economic losses. In the face of the increasingly complex fiber optic communication and transmission network architecture, how to carry out targeted damage resistance analysis based on the service carrying characteristics to improve the network survivability has always been a technical problem to be broken through in the field of network operation and maintenance.
The current research on damage resistance mainly focuses on evaluation methods and optimization strategies. By simulating the failure scenario of regional power and military optical transmission network nodes, the network connectivity rate is calculated to identify vulnerable components and propose strengthening schemes. The key node identification model is constructed based on the node intermediate number theory, and the topology optimization suggestion is put forward. ] By using the index of degree centrality and intermediate centrality, the node resistance of 500kV power grid in central China is analyzed. However, most of the existing researches focus on the identification of key nodes and lack the consideration of the overall performance of the network. Network toughness, as an important index to measure the failure resistance and recovery ability of the system, provides a new perspective for the research on the destruction resistance of optical fiber communication transmission network.
Firstly, the physical-logical network dependency model is constructed to clearly define the connotation and influencing factors of the destruction toughness of optical fiber communication transmission network. Then, a toughness measurement system including the key parameters such as fragility factor and recovery factor is established, and a quantitative evaluation model is proposed. Finally, through a typical regional network case, the influence rules of routing planning, switching delay and other parameters on resilience are empirically analyzed, and optimization suggestions with engineering guiding value are formed.
Optical fiber communication transmission network consists of a series of transmission devices deployed in communication stations and optical fiber links connecting these devices. These physical elements together constitute a physical network that can be abstractly understood, in which the communication station acts as the network node, and the optical fiber link acts as the side connecting the nodes. A service network is a logically connected network built according to service requirements, also known as a logical network. In a logical network, the scheduling of service channels relies on the underlying physical network, and each service demand unit can be regarded as the node of the logical network, and the service link is equivalent to the edge in the logical network.
The communication of the logical network depends on the physical network entity, which indicates that there is a tight coupling relationship between the logical network side and the physical network side. When a logical link fails, the corresponding physical link does not fail. When a physical link fails, the logical link fails. In addition, there is a clear mapping relationship between the node set of the logical network and the node set of the physical network, and this relationship can be abstracted into a virtual mapping edge, which will not fail. In particular, each logical network node can find its corresponding node entity on the physical network, but the physical network topology and the logical network topology may not be exactly the same.
Optical fiber communication and transmission network is a key component of China's information infrastructure, so it is of great significance to study the damage resilience of optical fiber communication and transmission network. The definition of the destruction toughness of optical fiber communication transmission network is clarified, its influencing factors are analyzed, and the evaluation method of destruction toughness is designed. Finally, through the quantitative analysis of the influence values of active/standby routing planning, active/standby switching time and mobile access time on the anti-failure toughness performance, the opinions and suggestions on improving the anti-failure toughness are put forward, so as to provide an effective reference for the research on the anti-failure toughness of optical fiber communication transmission network.