Digital Subscriber Line Crosstalk Reduction via Pre-provisioned PSD
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Solution Overview
Problem
Existing methods for reducing line-to-line crosstalk in digital subscriber line services are ineffective during service provisioning, as they either require post-provisioning spectral optimization or rely on complex algorithms that increase operational costs and data collection, failing to meet the maintenance habits of telecom operators.
Innovation Solution
A method and system that determine the power spectral density of a line before service provisioning by obtaining topology scenario parameters such as wire pairs, length, and diameter, allowing for pre-provisioned spectral planning to minimize crosstalk and optimize service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If post-provisioning spectral optimization methods (DLM or DSM L2) are used to reduce line-to-line crosstalk, then crosstalk is reduced, but service provisioning time increases and operational complexity increases
Solution Approach 1:
The patent applies preliminary action by calculating and determining the power spectral density template before service provisioning. The system pre-calculates the PSD template using line parameters (length, attenuation, noise) and stores it for direct application during service activation. This eliminates the need for post-provisioning spectral optimization, allowing service to be provisioned immediately without time-consuming iterative adjustments.
Solution Approach 2:
The patent segments the service provisioning process into distinct phases: pre-provisioning PSD template calculation based on line parameters, and direct service activation using the predetermined template. This segmentation separates the complex spectral optimization calculations from the service provisioning operation, allowing them to be performed independently and in advance.
2Object-affected harmful factors
If post-provisioning spectral optimization methods are used to reduce line-to-line crosstalk, then crosstalk is reduced, but system complexity and data collection requirements increase
Solution Approach 1:
The patent performs the complex spectral optimization calculations in advance, before service provisioning. The power spectral density template is pre-calculated using relatively simple formulas based on line parameters (length, attenuation, noise spectral density). This preliminary calculation eliminates the need for complex iterative algorithms during service activation, reducing real-time computational complexity.
Solution Approach 2:
The patent creates a standardized power spectral density template that can be copied and applied to multiple services on the same line. Instead of performing complex optimization calculations for each service provisioning event, the system replicates the predetermined PSD template, significantly reducing computational overhead and system complexity during operational phases.
3Object-affected harmful factors
If max margin control is used to reduce line-to-line crosstalk, then total sending power is controlled, but control precision decreases
Solution Approach 1:
The patent changes the control parameter from a single scalar value (max margin in dB) to a detailed power spectral density template that specifies power distribution across multiple frequency bins. This parameter transformation enables precise control of transmitting power at each frequency, allowing optimization of both total power and spectral distribution to minimize crosstalk impact on specific frequency bands used by neighboring lines.
Data Source
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AI summary
A method, an apparatus, and a system for reducing line-to-line crosstalk during transmission of a digital subscriber line service are disclosed, where the method includes: before a service is provisioned, obtaining, by a service provider according to a service transmission rate and a topology scenario parameter that are provided by a service receiving side device, a power spectral density of a line in a process of receiving a service by the service receiving side device; and provisioning, by the service provider, a service for the service receiving side device according to the power spectral density.