Upstream Power Control for DSL Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The near-far problem in DSL communications, where strong signals from short loops interfere with weaker signals on longer loops, leading to degraded data rates and crosstalk issues, especially in real-world deployments with mixed loop lengths and non-vectored lines, is not effectively addressed by current solutions like power back-off or vectoring.
Innovation Solution
The implementation of upstream power control systems that divide DSL lines into groups based on common characteristics, determine attainable data rates, and apply specific power control parameters to each group, allowing for optimized data rates and reduced crosstalk without requiring full vectoring or power back-off across all lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power back-off is applied to all lines to reduce crosstalk, then crosstalk is reduced, but transmission rates decrease
Solution Approach 1:
The patent applies different power control parameters to different groups of DSL lines based on their loop lengths and crosstalk characteristics. Instead of uniformly reducing power on all lines, the system identifies specific lines that cause or suffer from crosstalk problems and applies targeted power adjustments only to those lines, preserving high transmission rates on lines that do not require power reduction.
2Object-affected harmful factors
If vectoring is applied to all lines to cancel crosstalk, then crosstalk is greatly reduced, but equipment complexity and deployment cost increase
Solution Approach 1:
The patent implements crosstalk management without requiring full vectoring capability on all lines. By grouping lines based on characteristics and applying specific power control parameters to each group, the system achieves effective crosstalk management using existing equipment capabilities, avoiding the need for complex vectoring infrastructure deployment.
Solution Approach 2:
The patent changes power control parameters specifically for upstream transmissions on certain groups of lines rather than implementing a complete vectoring solution. This involves adjusting transmit power levels and spectral masks for specific line groups to mitigate crosstalk, achieving effective interference management through parameter optimization rather than structural system changes.
3Productivity
If upstream power control parameters are optimized for short loops, then data rates on short loops improve, but crosstalk to long loops increases
Solution Approach 1:
The patent applies different upstream power control parameters to different groups of lines based on their loop lengths and crosstalk characteristics. For lines prone to causing or receiving crosstalk, the system adjusts transmit power levels, spectral masks, or both, to optimize the balance between achieving high data rates and minimizing interference to other lines in the network.
Data Source
AI summary
Apparatuses, systems, and methods identify, among a plurality of DSL lines, a subgroup of DSL lines based on one or more common characteristics and use the common characteristic(s) to identify a set of power control parameters that enable an upstream rate for the subgroup of DSL lines that is different than an upstream rate for DSL lines in the plurality of DSL lines that do not include the subgroup of DSL lines before applying the set of power control parameters to the subgroup of DSL lines to achieve the upstream rate.