Decoder-Based Link Loss Detection for Low-Latency DSL Links
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Solution Overview
Problem
Existing methods for detecting link loss in communication systems, such as DSL, suffer from high latency, leading to significant performance losses during the transition phase before detection, which negatively impacts DSL vector engine calculations.
Innovation Solution
Detecting link loss based on coded signals by decoding techniques, utilizing error signals from decoders like Viterbi or Reed-Solomon decoders, and monitoring energy levels in time and frequency domains to identify link loss quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If reference implementations detect link loss using traditional methods, then detection accuracy is maintained, but detection latency becomes high (2-10 seconds)
Solution Approach 1:
The patent segments the link loss detection process into multiple independent analysis dimensions: coded signal characteristics, decoding results, and energy levels in time/frequency domains. Each segment provides partial detection information, and their combination enables fast and accurate detection, resolving the contradiction between speed and accuracy.
Solution Approach 2:
The patent introduces additional detection dimensions beyond traditional methods by analyzing energy levels in both time domain and frequency domain, and by utilizing decoded signal characteristics. This multi-dimensional approach enables faster detection while maintaining accuracy, as each dimension provides complementary information about link status.
2Productivity
If link loss detection latency is reduced, then performance degradation during transition phase is minimized, but detection complexity increases
Solution Approach 1:
The patent makes the detection system multi-functional by using a single detection apparatus that simultaneously analyzes coded signals, decoding results, and energy levels across multiple domains. This universal approach achieves fast detection without requiring separate specialized systems for each detection method, thus managing complexity while improving speed.
Solution Approach 2:
The detection system utilizes information already present in the communication signal itself (coded signal characteristics and decoding results) rather than requiring external detection equipment. The signal's own properties are leveraged for detection, reducing the need for additional complex external monitoring systems.
Data Source
AI summary
A coded signal is received via a physical link and decoded. A link loss of the physical link is detected based on at least one of the coded signal and said decoding.