Recursive Rate Selection for Flexible WDM Spectrum Minimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional WDM networks have inefficient spectral resource utilization due to fixed spectrum allocation, which limits their ability to adapt to varying data rates, leading to suboptimal spectral efficiency and increased hardware costs.
Innovation Solution
A recursive rate selection procedure is introduced for flexible WDM networks, which determines the optimal set of channels and spectrum required for a given data rate by breaking it down into lower data rates, minimizing the total spectrum needed and allowing for heterogeneous line rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed spectrum allocation is used in WDM networks, then network simplicity and ease of operation are maintained, but spectral efficiency deteriorates due to rigid channel assignment regardless of data rate requirements
Solution Approach 1:
The patent implements dynamic spectrum allocation where channel bandwidths are no longer fixed but adapt to data rate requirements. The system allows channels to flex their spectrum width based on traffic demands, transforming the rigid fixed-grid structure into a dynamic resource allocation mechanism that optimizes spectral efficiency while maintaining operational simplicity through automated control.
Solution Approach 2:
The invention changes the fundamental parameter of channel bandwidth from a fixed value to a variable parameter that adjusts according to data rate requirements. By allowing channel bandwidth to be modified dynamically based on traffic conditions, the system resolves the contradiction between operational simplicity and spectral efficiency, achieving both through parameter adaptability.
2Quantity of substance
If maximum line rate channels are selected to minimize channel count, then the number of channels is reduced, but total spectrum consumption increases due to fixed bandwidth allocation
Solution Approach 1:
The patent applies local quality by allowing different channels to have different bandwidth allocations tailored to their specific data rate requirements. Instead of uniformly allocating maximum bandwidth to all channels, each channel receives spectrum width locally optimized for its actual traffic needs, thereby minimizing total spectrum consumption while supporting the required number of channels.
Solution Approach 2:
The invention avoids excessive spectrum allocation by assigning only the partial bandwidth necessary for each channel's actual data rate requirement. Rather than allocating full maximum bandwidth to every channel regardless of need, the system provides precisely the amount of spectrum each channel requires, eliminating waste and reducing total spectrum consumption.
3Productivity
If flexible spectrum allocation is implemented in WDM networks, then spectral efficiency is improved through adaptive channel bandwidth, but system complexity increases due to rate selection procedures
Solution Approach 1:
The patent applies preliminary action by pre-establishing a library of standard channel bandwidth options corresponding to common data rates. Before actual channel allocation, the system has prepared a set of predefined bandwidth configurations, allowing the rate selection procedure to simply match requirements against pre-computed options rather than performing complex real-time optimization, thus reducing system complexity.
Solution Approach 2:
The invention segments the continuous spectrum allocation problem into discrete standard bandwidth options. By dividing the spectrum allocation into predefined categories (e.g., 50GHz, 100GHz, 200GHz channels), the system transforms a complex continuous optimization problem into a simpler discrete selection process, reducing computational complexity while maintaining flexibility and spectral efficiency.
Data Source
AI summary
An inventive method implemented in a communications system includes obtaining a first data rate in a flexible wavelength division multiplexing FWDM network and applying a recursive rate selection for determining a given data rate from the obtained first data rate such that a required spectrum over the FWDM network for the given data rate is minimized, the first data rate being lower than the given data rate.