Source Routing in Blocking Cross Networks via Link and Wavelength Constraints
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Solution Overview
Problem
In blocking cross networks, existing technologies only consider available link bandwidth for routing calculations, leading to complex and inefficient service path and wavelength selection processes during call connection establishment.
Innovation Solution
The method involves diffusing link state advertisement information that includes cross constraint characteristic information, such as physical transmission link layer and wavelength channel constraints, allowing nodes to calculate and select qualified service paths based on these constraints during call connection establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only available link bandwidth information is considered for routing calculation, then the routing process is simple, but the service path and wavelength selection becomes complex and inefficient
Solution Approach 1:
The patent segments the constraint characteristics into two independent layers: link layer constraints (switching capability between links) and wavelength layer constraints (wavelength switching groups). This segmentation allows routing calculations to consider both layers independently yet comprehensively, avoiding the complexity of handling all constraints as a single unified problem while ensuring efficient service path and wavelength selection.
Solution Approach 2:
The patent introduces a new dimension of analysis by explicitly modeling constraint characteristics at multiple layers (link layer and wavelength layer). Instead of traditional single-layer routing, the solution adds hierarchical dimensionality to the routing calculation, enabling simultaneous consideration of physical link connectivity and wavelength channel constraints without overwhelming complexity.
2Ease of manufacture
If wavelength switching capability is limited to up-and-down or straight-through, then the hardware implementation is simple, but the network adaptability and routing flexibility are reduced
Solution Approach 1:
The patent introduces dynamic wavelength switching capability through the wavelength switching group mechanism. Instead of fixed up-and-down or straight-through routing only, the system dynamically determines wavelength switching possibilities based on the constraint characteristic matrix, allowing flexible end-to-end wavelength routing while maintaining relatively simple hardware implementation through standardized switching groups.
Solution Approach 2:
The patent creates a universal wavelength switching group structure that can handle multiple routing scenarios (up-and-down, straight-through, and cross-routing) within a single framework. This multi-functional approach allows the same hardware infrastructure to support various wavelength switching modes without requiring separate specialized components for each routing type.
3Device complexity
If service scheduling capability is considered at only one layer, then the analysis is simple, but the accuracy of service path selection is insufficient
Solution Approach 1:
The patent segments the constraint analysis into two independent layers: link layer service scheduling capability and wavelength layer wavelength switching capability. Each layer is analyzed separately using its specific constraint characteristics, then the results are integrated to determine accurate end-to-end service path selection. This segmentation prevents analysis paralysis while ensuring comprehensive and accurate routing decisions.
Solution Approach 2:
The patent adds a hierarchical dimension to constraint analysis by examining both link layer and wavelength layer constraints simultaneously. This multi-layer dimensional approach provides more accurate service path selection by considering both physical link connectivity and wavelength channel constraints, rather than relying on single-layer analysis alone.
Data Source
AI summary
The present invention discloses a method for realizing source routing in a blocking cross network. Link state advertisement information diffused in the network carries cross constraint characteristic information, and a call initiating node checks a path tree and gets a service path according to the cross constraint characteristic information included in the link state advertisement information in the network; the cross constraint characteristic information includes physical transmission link layer constraint information of a link in a node, which is called link switching constraint information, and constraint information of each wavelength channel in the link, which is called wavelength constraint characteristic information. The present invention also discloses an apparatus for realizing source routing in a blocking cross network. When a control connection request is initiated, the present invention can calculate a complete end-to-end path and a proposed wavelength of each link according to the link switching constraint information and the wavelength constraint characteristic information, and multi-level service scheduling is supported.