IP-Optical Path Switching for Uninterrupted Service Traffic
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Solution Overview
Problem
Conventional service path switching methods in IP and optical layers cause transient interruptions, especially for high-bandwidth and low-delay services, due to reliance on fault detection at the IP layer and lossy switching solutions that affect IP services.
Innovation Solution
A method that involves determining the associated IP link for service traffic, adjusting IP links to reroute service traffic through a standby optical layer path before switching the optical layer path, ensuring continuous service by triggering rerouting after the optical layer path recovers, thereby avoiding direct optical layer path switching interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct optical layer path switching is performed, then optical layer path recovery is achieved, but service traffic interruption occurs
Solution Approach 1:
The patent performs preliminary IP layer path switching before optical layer path switching. When optical layer path switching is needed, the system first switches the IP layer service path to an alternative route, then performs the optical layer path switching, and finally restores the IP layer path. This preliminary action at the IP layer prevents service traffic interruption during optical layer path recovery.
Solution Approach 2:
The patent introduces the IP layer as an intermediary between the service traffic and the optical layer path. By routing service traffic through the IP layer with alternative paths, the system mediates the connection between service traffic and optical layer paths, allowing optical layer switching without directly interrupting service traffic flow.
2Reliability
If IP layer fault detection is used for path switching, then link reliability is ensured, but transient service interruption occurs
Solution Approach 1:
The system performs preliminary path preparation and IP layer switching before the actual optical layer path change takes effect. By anticipating the need for path switching and preparing alternative routes in advance at the IP layer, the system minimizes the time service traffic is interrupted during optical layer path recovery.
3Ease of operation
If lossy switching solution is applied, then optical layer path switching is simplified, but IP service quality deteriorates
Solution Approach 1:
The patent segments the path switching process into two independent layers: optical layer path switching and IP layer path switching. The optical layer switching can be performed using simplified lossy switching methods, while the IP layer simultaneously performs lossless path switching. This segmentation allows each layer to use the most appropriate switching method for its requirements, maintaining IP service quality while simplifying optical layer operations.
Data Source
AI summary
According to a method, when it is detected that service traffic needs to be switched from a first optical layer path to a second optical layer path, a first internet protocol (IP) link associated with the service traffic needs to be determined, and an IP link used to transmit the service traffic is adjusted from the first IP link to a second IP link; an optical layer path of the first IP link is switched from the first optical layer path to the second optical layer path after the adjustment of the IP link is completed; and the IP link used to transmit the service traffic is adjusted from the second IP link to the first IP link after the switching of the optical layer path is completed. In this way, continuity of the service traffic can be ensured.