Virtual Optical Network Availability via Q-factor Probability Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical network virtualization methods often result in poor spectral efficiency and inadequate network reliability due to suboptimal quality of service metrics, leading to inefficient use of network resources and reduced availability of virtual optical network services.
Innovation Solution
A method is disclosed that identifies an optical path for a virtual link in a virtual optical network by determining potential physical nodes and links, calculating wavelength configurations, and selecting the most suitable configuration based on probability density functions for the optical signal-to-noise ratio (OSNR) and quality factor (Q-factor) to ensure guaranteed availability, which involves measuring and modeling optical performance to optimize network resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional quality of service metrics are used for mapping virtual nodes to physical topology, then network services can be provided, but spectral efficiency deteriorates and network reliability is insufficient
Solution Approach 1:
The patent changes the parameter used for quality of service from conventional metrics to availability-based metrics. Specifically, it uses probability density functions (PDFs) of Q-factor to calculate availability values, and maps virtual links to physical lightpaths based on these availability values. This parameter change enables simultaneous achievement of high spectral efficiency and guaranteed network reliability, resolving the technical contradiction between the two objectives.
2Productivity
If conventional VON provisioning methods are used, then multiple virtual optical networks can be coexisting, but network resource utilization becomes inefficient
Solution Approach 1:
The patent performs preliminary calculation of availability values for potential lightpaths before actual VON provisioning. It pre-computes PDFs of Q-factor and derives availability values using integrals of these PDFs. This preliminary action enables efficient resource allocation during provisioning while guaranteeing service availability, resolving the contradiction between resource utilization and reliability.
3Adaptability or versatility
If fixed wavelength configurations are used for optical paths, then implementation is simplified, but spectral efficiency and adaptability deteriorate
Solution Approach 1:
The patent introduces dynamic wavelength configuration selection based on calculated availability values. Instead of fixed configurations, the system dynamically determines the optimal wavelength configuration for each virtual link by evaluating PDFs of Q-factor and selecting configurations that meet availability requirements. This dynamic approach provides adaptability while maintaining manageable complexity through automated calculations.
Data Source
AI summary
A method for VON service with guaranteed availability may use probability density functions (PDF) of Q-factor to determine availability of physical links assigned to a virtual link in the VON. Then, a VON mapping may be performed based on the determined availabilities, among other factors.