Flexible Grid Super-Channel Bandwidth Allocation
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Solution Overview
Problem
Optical networks face challenges in scaling to transport higher data rates, such as ultra-high data rates exceeding one terabit per second, due to the limitations of fixed channel size schemes that are independent of channel bit rate.
Innovation Solution
Implementing a flexible-grid channel bandwidth allocation scheme that allows for the establishment of super-channels with tailored bandwidth, where nodes can dynamically allocate bandwidth based on the specific requirements of aggregated traffic, using bit words and pointers to reserve bandwidth segments within the operating spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed channel size scheme is used, then network simplicity and ease of operation are maintained, but network capacity and adaptability to ultra-high data rates are limited
Solution Approach 1:
The operating spectrum is divided into multiple bandwidth segments that can be individually allocated. Each bandwidth segment represents a discrete unit of spectrum that can be combined to form channels of varying sizes, enabling flexible bandwidth allocation while maintaining manageable system complexity through modular organization
Solution Approach 2:
The system transitions from static fixed channel sizes to dynamic bandwidth allocation where channel bandwidth can be adjusted based on traffic requirements. The flexible grid enables real-time reconfiguration of bandwidth allocations, allowing the network to adapt to changing data rate demands up to ultra-high rates
2Adaptability or versatility
If fixed channel sizes are allocated, then resource allocation is simplified, but spectrum efficiency and bandwidth utilization are reduced
Solution Approach 1:
The spectrum is segmented into standardized bandwidth units that can be flexibly combined. This segmentation allows the system to provide variable bandwidth allocations (adapting to different traffic needs) while managing complexity through the use of discrete, pre-defined spectral building blocks
Solution Approach 2:
The system changes the fundamental parameter of channel bandwidth from fixed to variable. By implementing a flexible grid with adjustable channel spacing and support for multiple bandwidth sizes, the system achieves spectral adaptability while using standardized parameters to control complexity
3Loss of energy
If bandwidth is allocated in fixed increments, then allocation simplicity is maintained, but spectrum waste and congestion occur
Solution Approach 1:
Different parts of the spectrum can be allocated with different bandwidth sizes based on local traffic requirements. This allows precise matching of bandwidth to actual needs in each spectral region, eliminating the waste associated with uniform fixed allocations while maintaining operational simplicity through automated allocation algorithms
Data Source
AI summary
A node is configured to receive an instruction to establish a channel having a bandwidth that corresponds to an operating spectrum an optical fiber; obtain information that identifies a channel spacing and a pointer that identifies where, within the spectrum, to establish bandwidth allocations; identify a group of bandwidth segments based on the spectrum and the channel spacing; and generate bit words that correspond to the bandwidth allocations, where the bit words includes bits that, when set to a value, cause sets of segments to be reserved within the spectrum, and where the sets of segments identify where the bandwidth allocations begin and end, within the spectrum, relative to the pointer.