Dynamic Line Management Using QoE and Sync Rate
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Solution Overview
Problem
DSL lines face interference issues, such as Repetitive Electrical Impulse Noise and metallic faults, which existing Dynamic Line Management (DLM) systems struggle to stabilize, leading to poor synchronization rates and user experience, especially during specific conditions.
Innovation Solution
A method that determines a Quality of Experience (QoE) measure and synchronisation rate for various line profiles, selecting and applying a profile with equivalent or better QoE and highest synchronisation rate, and reverting to previous profiles if current QoE does not improve, with DLM only re-engaging if significant changes occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DLM applies line profiles with higher target signal to noise ratio margin to improve line stability, then line stability is improved, but synchronisation rate is reduced
Solution Approach 1:
The system dynamically switches between different line profiles based on real-time QoE measurements and synchronisation rate observations. Instead of statically applying a single profile with higher noise margin, the system adapts profile selection according to actual line conditions, allowing optimal balance between stability and synchronisation rate at different times.
Solution Approach 2:
The system changes the operational parameters by selecting from multiple pre-defined line profiles with different configurations (target signal to noise ratio margins, error correction techniques, synchronisation rate caps). The selection is based on comparing QoE measures and synchronisation rates across different profiles, effectively changing parameters to optimize both stability and performance.
2Reliability
If DLM applies multiple line profiles to stabilize DSL lines under interference conditions, then line stability may be improved, but user experience deteriorates when no suitable profile exists
Solution Approach 1:
The system implements a feedback mechanism by continuously measuring QoE and synchronisation rate for each applied line profile. This feedback is used to determine whether to switch profiles or revert to previous configurations. The feedback loop ensures that profile changes actually improve user experience before committing to them, preventing degradation from ineffective profile selections.
Solution Approach 2:
The system performs preliminary testing of line profiles by applying them temporarily and measuring their QoE and synchronisation rate performance before making permanent changes. This preliminary action allows the system to evaluate potential profile effectiveness without immediately committing to configurations that might degrade user experience.
3Productivity
If DLM continuously monitors and switches between line profiles, then line performance can be optimized, but system complexity increases
Solution Approach 1:
The system segments the line management function into distinct line profiles, each with specific configurations for different line conditions. Instead of implementing a single complex adaptive algorithm, the system divides the solution into multiple pre-configured profiles that can be selectively applied, simplifying the control logic while maintaining optimization capability.
Data Source
AI summary
This invention relates to a method of dynamic line management (DLM) for a digital subscriber line. A quality of experience (QoE) measure is calculated for the digital subscriber line, and the QoE is recorded with the respective DLM line profile and also the line synchronization rate associated with the line profile. The QoE measure is preferably based on line parameters such as a count of the error rate on the line and loss of synchronizations on the line, averaged over a predetermined period of time. Other line parameters could be used in determining the QoE measure. When DLM exhausts all the available line profiles, the invention checks to see if the QoE associated with the line profile currently being applied is an improvement on the QoE of previously applied line profiles, and if it is an improvement, then the current line profile is maintained. However, if the new QoE is not an improvement to that associated with a previously applied line profile, then the invention reverts the line back to one of the earlier line profiles. The line profile selected to revert back to is one having the same QoE or better, and if there are multiple line profiles satisfying that condition, then the line profile that has the highest associated line synchronization rate is selected.