Multicast Switch Node Conflict Resolution Method Based on Spectrum Conversion and Optical Buffering Technology

Abstract

The invention relates to a multicast switching node conflict resolution method based on spectrum conversion and optical buffer technology, and belongs to the technical field of optical fiber communication. Including the elastic optical multicast switching node structure and its scheduling strategy based on the combination of limited range spectrum converter and fiber delay line. When unicast or multicast services collide at the output end of the switching node, first use the limited-range spectrum converter to resolve spectrum conflicts in the spectrum domain according to the scheduling algorithm based on the minimum difference, minimize unusable spectrum, and improve spectrum utilization. For unicast or multicast services without conflict resolution, the fiber delay line is used to resolve conflicts in the time domain according to the scheduling algorithm based on low delay, and at the same time, it is considered to avoid conflicts between the input end of the fiber delay line and the destination output end. The proposed structure and scheduling algorithm of the present invention greatly reduce the probability of conflict in the switch node, reduce the bandwidth blocking rate and average time delay, and further improve the performance of the flexible optical multicast switch node.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to a multicast switching node conflict resolution method based on spectrum conversion and optical buffer technology. Background technique [0002] With the continuous emergence of new broadband network applications such as cloud computing, high-definition video, and online games, users have higher requirements for network bandwidth. The traditional wavelength division multiplexing optical network adopts a fixed wavelength grid allocation method, which causes a great waste of bandwidth resources. Compared with the wavelength division multiplexing optical network, the elastic optical network based on orthogonal frequency division multiplexing divides the spectrum resources into smaller granularity, and dynamically allocates spectrum for service requests, which can effectively improve spectrum utilization and flexible bandwidth allocation Therefore, it is widely cons...

AI Technical Summary

Problems solved by technology

The deflection routing method takes up a lot of resources on the entire network when resolving conflicts. When the network is under high load, it will cause serious congestion and easily cause detours.

Network coding increases computational complexity, and encoding and decoding operations increase transmission delay

Therefore, spectral conversion and optical buffering techniques are usually used as conflict resolution methods, but the research on this method is still a difficult problem

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