LSP Failure Detection and Hot Switching for QoS Continuity
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Solution Overview
Problem
In networks with an independent bearer control layer, existing methods lack effective protection for Label Switched Paths (LSPs), leading to service stream interruptions when failures occur, negatively impacting user experience and QoS reliability.
Innovation Solution
A method that detects failures on LSPs and switches service streams to backup LSPs or allocates new LSPs, ensuring continuous service through hot switching, using resource control functions and edge or transmit routers to manage network topologies and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cold backup method is used to guarantee LSP reliability, then implementation simplicity is improved, but service continuity is worsened due to connection rebuilding requirements
Solution Approach 1:
The patent pre-establishes backup LSPs alongside primary LSPs before failures occur. When a failure is detected, the system can immediately switch to the pre-configured backup LSP without needing to rebuild connections, thus achieving both implementation simplicity and service continuity.
Solution Approach 2:
The patent creates backup LSPs that are copies of the primary LSP path. These backup paths are pre-configured with identical routing and resource allocations, allowing immediate substitution when the primary LSP fails, eliminating the need for connection rebuilding while maintaining implementation simplicity.
2Reliability
If hot switching is implemented for LSP failure protection, then service continuity is improved, but system complexity is worsened due to additional backup LSP management
Solution Approach 1:
The patent introduces a bearer network resource manager as an intermediary that centrally manages backup LSP configurations, failure detection, and switching operations. This intermediary handles the complexity of backup management, allowing individual network elements to perform simple switching actions while maintaining service continuity.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors LSP status and automatically triggers switching to backup LSPs when failures are detected. This automated feedback loop manages the complexity of hot switching by using real-time status information to drive switching decisions without requiring complex manual intervention.
3Reliability
If backup LSPs are pre-configured for all possible failures, then service continuity is improved, but network resource consumption is worsened due to duplicate path resources
Solution Approach 1:
The patent applies local quality by configuring backup LSPs selectively based on the specific failure modes and criticality of different network segments. Instead of uniformly provisioning backups everywhere, the system tailors backup configurations to local network conditions, critical service requirements, and failure probabilities, optimizing the balance between service continuity and resource consumption.
Data Source
AI summary
The present invention discloses a method for guaranteeing reliability of end-to-end QoS, including: a. detecting and determining whether there is a failure on a Label Switched Path (LSP); if there isn't, returning to the process of detecting; otherwise, determining whether there is a backup LSP for the failed LSP; if there is, an edge router or a transmit router switching service streams and corresponding resources from the failed LSP to the backup LSP based on a certain policy; otherwise, a resource control function (RCF) entity allocating a new LSP according to network topologies for the service streams born on the failed LSP, and switching the service streams from the failed LSP to the newly allocated LSP, and releasing the path resources formerly occupied by the service streams. The method can guarantee service continuity and reliability of QoS in a bearer network.