Restoration Path Establishment via Forward-Shared Node Bandwidth Reuse
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Solution Overview
Problem
Existing automatically switched optical networks face challenges in timely and effective service restoration due to insufficient bandwidth reservation, leading to reduced network reliability and increased costs.
Innovation Solution
A method and system for establishing a restoration path by identifying working and protection forward-shared nodes, allocating labels and interfaces based on node determination, and using signaling to ensure bandwidth sharing between restoration and working paths, enabling automatic path establishment and resource reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no bandwidth resource is reserved for the restoration path, then the networking cost is reduced, but the service cannot be restored in time and effectively, reducing network reliability
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the restoration path shares bandwidth resources with the working path during normal operation, and automatically obtains dedicated bandwidth when fault restoration is needed. This dynamic adjustment resolves the contradiction by making bandwidth resources flexible rather than static, allowing the system to maintain low networking costs while ensuring effective service restoration.
Solution Approach 2:
The patent changes the bandwidth allocation parameter from a fixed state (either reserved or not reserved) to a variable state that adjusts based on network conditions. During normal operation, the restoration path uses shared bandwidth with reduced allocation, and upon fault detection, the bandwidth parameter is increased to ensure effective restoration, thus resolving the contradiction between cost and reliability.
2Reliability
If a route is preset and a new bandwidth resource is reserved, then the service restoration is ensured, but requirements for a bandwidth resource increase and networking cost increases
Solution Approach 1:
The patent merges the bandwidth resources of the working path and restoration path into a shared resource pool. Instead of reserving separate bandwidth for each path, the system combines their bandwidth requirements and dynamically allocates from the merged resource pool, reducing total bandwidth requirements while maintaining restoration effectiveness.
Solution Approach 2:
The patent makes bandwidth resources universal by allowing the same bandwidth to serve multiple functions: it can be used by the working path during normal operation and by the restoration path during fault conditions. This multi-functionality eliminates the need for dedicated bandwidth reservation, reducing networking costs while ensuring reliable service restoration.
3Quantity of substance
If a route is preset but no bandwidth resource is reserved, then the networking cost is reduced, but the restoration path may preempt a resource of another service
Solution Approach 1:
The patent performs preliminary actions by establishing the restoration path routing in advance and setting up the framework for bandwidth sharing, but delays actual bandwidth allocation until fault occurrence. This preliminary configuration allows the system to have restoration paths ready without committing bandwidth resources, preventing resource preemption while ensuring timely restoration when needed.
Data Source
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AI summary
The present invention relates to the field of network communications and specifically discloses a method for establishing a restoration path. The method includes: obtaining, by a first node, a working forward-shared node set of a restoration path according to route information of the restoration path and a working path of a service; determining, by the first node according to the working forward-shared node set, whether the first node is a working forward-shared node, and allocating a first label and a first interface; sending, by the first node, an establishment request message to a first downstream neighboring node, where the establishment request message includes at least the first label, the first interface, the route information of the restoration path, and working forward-shared node information; receiving, by the first node, an establishment response message of the restoration path, where the establishment response message includes at least a fourth label, a fourth interface, and the route information of the restoration path; and establishing, by the first node, a cross-connection of the restoration path according to the first label, the first interface, the fourth label, and the fourth interface. Embodiments of the present invention further disclose a system and a node device for establishing a restoration path.