ASON Domain-to-Domain Link Identification via Route Control ID Comparison
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Solution Overview
Problem
In hierarchical ASON networks with more than two layers, existing methods fail to identify domain-to-domain links between control domains, preventing the correct diffusion of domain-to-domain link information to higher layers, which hampers the establishment of cross-domain connections.
Innovation Solution
The method involves storing and exchanging route control IDs (RC IDs) across multiple network layers, comparing these IDs to determine link types, and diffusing this information hierarchically to identify domain-to-domain links and prevent incorrect upward diffusion of link information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hierarchical ASON is divided into multiple control domains to manage large-scale networks, then network scalability is improved, but the ability to identify domain-to-domain links between control domains deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism using route control IDs (RC IDs) and domain identifiers as mediators to enable control domains to identify domain-to-domain links. Each node stores RC IDs of abstract nodes from higher layers and exchanges domain identifier information with adjacent nodes to determine link types, thus resolving the information loss problem while maintaining network scalability
Solution Approach 2:
The patent adds a new dimension of identification by introducing route control IDs that reference abstract nodes in higher layers. This dimensional extension allows nodes to distinguish between intra-domain and domain-to-domain links by comparing RC IDs across different hierarchical levels, enabling accurate link identification in multi-domain networks
2Device complexity
If existing link identification methods are used in hierarchical ASON with more than two layers, then implementation simplicity is maintained, but accuracy in identifying domain-to-domain links deteriorates
Solution Approach 1:
The patent performs preliminary actions by pre-storing route control IDs of abstract nodes from higher layers in nodes before link identification is needed. This pre-preparation of hierarchical link information enables accurate domain-to-domain link identification without adding complex real-time computation, maintaining implementation simplicity while improving precision
Solution Approach 2:
The patent uses copying by having nodes store copies of route control IDs from higher layers in their local databases. These copied RC IDs are then used for comparison during link type determination, allowing nodes to accurately identify domain-to-domain links using replicated information from higher hierarchical levels
3Speed
If incorrect link information is diffused upward to higher layers, then propagation speed is maintained, but routing correctness deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where nodes provide feedback information about their link types (intra-domain or domain-to-domain) to higher layers through controlled diffusion. This feedback ensures that only correct domain-to-domain link information is propagated upward, preventing routing errors while maintaining efficient information propagation speed through targeted diffusion
Data Source
AI summary
A method of identifying domain-to-domain link based on ASON (Automatically Switched Optical Network), including: storing, by a node in ASON, a route control ID of an abstract node each high layer network; obtaining, by the node, the route control ID of the abstract node in each network layer stored in an opposite terminal node with an exchanging method; comparing, by the node, the route control ID of the abstract node in each network layer stored locally with the route control ID of the abstract node in a corresponding network layer stored in the opposite terminal node respectively, and determining whether the link between the node and the opposite terminal node is a domain-to-domain link according to the comparing result. With the invention, the control domain of each layer in a hierarchical ASON can identify the domain-to-domain link between the nodes in the present layer.