Pre-stored Detour Path Selection for Rapid Failure Recovery
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Solution Overview
Problem
Conventional communication network systems face challenges in rapidly detouring multiple paths without resource contention and reverting to the original route after failure recovery, due to reliance on routing protocol convergence and inefficient path re-routing methods.
Innovation Solution
A communication network system with a start-point communication device that pre-stores detour paths and selects the highest priority switchable detour path upon failure, managing working and detour paths separately to avoid resource contention and enable quick recovery and reversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If path re-routing is performed using routing protocol convergence, then failure detection is achieved, but recovery time increases due to waiting for protocol convergence
Solution Approach 1:
The patent pre-calculates and stores multiple detour paths in advance before failures occur. When a failure is detected, the system immediately switches to a pre-computed detour path without waiting for routing protocol convergence, thereby reducing recovery time while maintaining reliable failure detection
2Adaptability or versatility
If detour paths are calculated dynamically after failure, then route adaptability is achieved, but resource contention occurs at intermediate nodes when multiple paths fail simultaneously
Solution Approach 1:
The system pre-calculates multiple detour paths for each working path before failures occur and stores them in advance. When failures happen, these pre-computed paths are immediately activated without dynamic calculation, eliminating resource contention at intermediate nodes while maintaining adaptability to different failure scenarios
Solution Approach 2:
The patent segments the network into multiple independent detour paths that are pre-calculated and stored separately. Each detour path is independently configured to avoid specific failure locations, allowing selective activation without resource contention when multiple failures occur simultaneously
3Productivity
If currently-used path is deleted to set detour route, then network resource reuse is enabled, but reversion to original route after recovery becomes difficult
Solution Approach 1:
The system stores information about the original working path in advance before it is deleted. After failure recovery, the system retrieves this pre-stored path information and reactivates the original working path without requiring complex recalculation or manual reconfiguration, enabling easy reversion while maintaining resource reuse efficiency during the failure period
Data Source
AI summary
A communication network system including a plurality of communication devices each including a switching unit which switches traffic routes, and transmission links which connects the plurality of communication devices, wherein a start-point communication device of the plurality of communication devices including: a storage unit which previously stores information of a plurality of detour paths corresponding to but having routes different from a working path that is transferring traffic between the start-point communication device and an endpoint communication device; and a setting unit which receives a failure notification when a failure occurs in the working path, selects a detour path that is switchable and has the highest priority from among the plurality of detour paths stored in the detour path information storage unit, and then sets relevant communication devices among the plurality of communication devices along the route of the detour path to recover from the failure.