Wavelength Cross-Connection via Dynamic Spectrum Allocation
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Solution Overview
Problem
Current methods for establishing wavelength cross-connections in WDM networks are complex and unreliable, leading to inefficient spectrum resource utilization due to fixed bandwidth allocation, which results in wasted resources as services with different bandwidth requirements are accommodated.
Innovation Solution
A method and system that allow nodes to dynamically determine and establish wavelength cross-connections by intersecting available center frequency sets across multiple links, enabling flexible spectrum bandwidth allocation based on service requirements through a request-response message exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual configuration is performed on nodes using a network management system to establish wavelength cross-connection, then wavelength cross-connection can be established, but the implementation becomes complex and reliability is low
Solution Approach 1:
The patent enables nodes to automatically establish wavelength cross-connections by autonomously determining available center frequency sets and performing message exchanges with neighboring nodes, eliminating the need for manual configuration through network management systems. This self-service mechanism improves reliability while reducing implementation complexity.
Solution Approach 2:
The patent performs preliminary determination of available center frequency sets at each node before establishing the wavelength cross-connection. By pre-calculating and storing the intersection of available center frequencies across all links in advance, the system simplifies the actual cross-connection establishment process and improves reliability through preparedness.
2Productivity
If spectrum resources are divided into fixed spectrum intervals for wavelength channels, then wavelength connections can be established, but spectrum resources are wasted and utilization is reduced
Solution Approach 1:
The patent introduces dynamic spectrum allocation by allowing wavelength connections to use variable bandwidths based on actual service requirements. Instead of fixed spectrum intervals, the system dynamically determines the minimum necessary spectrum resources by calculating the intersection of available center frequency sets, thereby improving spectrum utilization and reducing waste.
Solution Approach 2:
The patent changes the parameter of spectrum bandwidth from fixed to variable by enabling different wavelength connections to occupy different spectrum widths. This is achieved through the available center frequency set intersection method, which allows the system to allocate exactly the required bandwidth for each service, optimizing resource utilization and eliminating the waste caused by over-provisioning.
Data Source
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AI summary
The present invention relates to the network communications field, and specifically discloses a method for establishing a wavelength cross-connection, including: determining, by a first node, a spectrum bandwidth of a wavelength connection, and obtaining a first available center frequency set of a first link according to the spectrum bandwidth; obtaining, by the first node, first available center frequency set information and spectrum bandwidth information, and sending a request message carrying the first available center frequency set information and the spectrum bandwidth information to the neighboring node in the direction from the first node to the second node; and receiving, by the first node, a response message, extracting center frequency information carried in the response message, obtaining a center frequency of the wavelength connection, and establishing a wavelength cross-connection based on a spectrum range determined by the center frequency and the spectrum bandwidth.