Session Number Maintenance for Synthetic Loss Measurement Accuracy
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Solution Overview
Problem
Conventional synthetic loss measurements in communication networks suffer from measurement errors due to a lack of statefulness among Maintenance Entity Group End Points (MEPs), particularly when network configuration changes occur, leading to disruptions and inaccurate frame loss calculations.
Innovation Solution
The method involves maintaining and updating session numbers for interface components at MEPs to ensure accurate frame loss calculations during network configuration changes, such as interface deactivation and activation, by copying session numbers and resetting frame counts as necessary, allowing continuous synthetic loss measurements without interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional synthetic loss measurements are performed without maintaining session state, then the measurement process is simpler, but measurement accuracy deteriorates due to errors during network configuration changes
Solution Approach 1:
The patent applies preliminary action by pre-establishing session identifiers and session state information at the maintenance points before configuration changes occur. The session state includes transmitting and receiving session numbers that are maintained and updated in advance, allowing the system to quickly adapt to interface deactivations and activations without losing measurement continuity or accuracy.
2Duration of action of stationary object
If session numbers are maintained and updated during configuration changes, then measurement continuity is improved, but processing complexity increases
Solution Approach 1:
The patent applies copying by creating and maintaining copies of session state information at both transmitting and receiving maintenance points. Each end point stores session identifiers and frame counts that are copied and synchronized during configuration changes, ensuring that both ends have consistent state information without requiring complex real-time communication protocols.
Solution Approach 2:
The patent implements feedback mechanisms where maintenance points monitor their own session state and automatically update session numbers when configuration changes are detected. The system provides feedback about interface activation/deactivation events and uses this feedback to trigger session state updates, maintaining measurement continuity through automated closed-loop control.
3Measurement precision
If frame counts are reset during interface changes, then measurement accuracy is maintained, but measurement interruptions increase
Solution Approach 1:
The patent applies continuity of useful action by ensuring that synthetic loss measurement operations continue uninterrupted during configuration changes. The session state management system maintains continuous frame counting and session tracking across interface transitions, eliminating gaps in measurement data collection and ensuring that the useful action of performance monitoring never stops.
Data Source
AI summary
A method and system for performing synthetic loss measurements (SLM) includes methods for single-ended and dual-ended synthetic loss measurements. The methods include maintaining a session number indicative of a physical network component at each maintenance point used to perform synthetic loss measurements. The session numbers are maintained according to a novel protocol and are used to detect a change in the network component, such as resulting from a protection switch event. The session numbers enable the synthetic loss measurements to continue irrespective of changes in the values for the session numbers and to remove errors when computing frame loss that may arise when physical network components change. The disclosed methods and systems may be used when a link aggregation group exists between a local maintenance point and a remote maintenance point.