Dynamic Spectrum Bandwidth Allocation in Optical Networks
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Solution Overview
Problem
In optical communications networks, the existing spectrum bandwidth allocation methods result in significant waste due to the use of fixed bandwidths and large guard bands, leading to reduced utilization rates and increased signal crosstalk between channels.
Innovation Solution
A method and device for dynamically allocating spectrum bandwidth by determining if existing services share the same path as a new service, and if so, allocating a narrower guard band between them, using idle spectrum bandwidth adjacent to existing channels to optimize bandwidth utilization while minimizing signal crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed spectrum bandwidth allocation method is used to avoid signal crosstalk, then signal crosstalk between adjacent channels is reduced, but spectrum utilization rate deteriorates due to serious spectrum waste
Solution Approach 1:
The patent implements dynamic spectrum bandwidth allocation by determining whether existing services share the same path as a new service. If paths are the same, a narrower guard band is allocated; if paths differ, a wider guard band is allocated. This dynamic adjustment optimizes spectrum utilization while maintaining crosstalk avoidance based on actual service requirements.
Solution Approach 2:
The patent applies different guard band widths based on the specific characteristics of service paths. When services share the same path, a smaller guard band is used locally; when paths are different, a larger guard band is applied. This localized differentiation optimizes spectrum allocation without unnecessarily increasing guard bands throughout the entire network.
2Reliability
If a large guard band is reserved to decrease signal crosstalk between channels, then signal crosstalk is reduced, but spectrum bandwidth utilization rate deteriorates
Solution Approach 1:
The patent changes the parameter of guard band width based on service path characteristics. By determining whether existing services share the same path as the new service, the system dynamically adjusts the guard band parameter - using a smaller width when paths are identical and a larger width when paths differ, thereby optimizing the balance between crosstalk avoidance and spectrum utilization.
Solution Approach 2:
The guard band allocation is made dynamic rather than static. The system continuously evaluates service paths and adjusts guard band widths accordingly, allowing the network to adapt to varying traffic patterns and optimize spectrum usage in real-time while maintaining adequate protection against signal crosstalk.
3Adaptability or versatility
If flexible variable spectrum bandwidth is implemented, then service configuration flexibility is improved, but complexity of spectrum allocation management increases
Solution Approach 1:
The patent segments the spectrum into discrete units and allocates them based on service requirements. By dividing the spectrum bandwidth into manageable portions and using clear criteria for allocation (path comparison), the system achieves flexible service configuration while keeping the management process organized and controllable through systematic segmentation.
Solution Approach 2:
The system performs preliminary determination of service paths and identifies available spectrum resources before finalizing allocation. By pre-evaluating path overlap and preparing allocation decisions in advance, the system simplifies the overall management process while maintaining high flexibility in service configuration.
Data Source
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AI summary
The present invention provides a spectrum bandwidth allocation method and device. In the method and device, for a new service to be added, whether a path of the new service is the same as a path of existing services needs to be determined, and if yes, a spectrum bandwidth occupied by a channel of a service having the same path is determined in the existing services, an idle spectrum bandwidth that is adjacent to the spectrum bandwidth and meets a requirement of adding the new service is selected, and then spectrum bandwidth in an adjacent part of the spectrum bandwidth is allocated to the new service, and a guard band between channels of two services having a same path is narrower than a guard band between channels of two services having different paths. In the technical solutions of embodiments of the present invention, spectrum bandwidths occupied by channels of services having a same path are connected in series by using a relatively small spectrum bandwidth that serves as a guard band, which obviously improves a utilization rate of a spectrum bandwidth in an optical communications network.