Vectored DSL Interference Reduction via Legacy Line PSD Masking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for upgrading VDSL2 Legacy CPEs to Vectored-DSL systems are costly and time-consuming, as they require complete replacement or upgrading of all CPEs, which is impractical due to compatibility issues and the presence of obsolete equipment, leading to prolonged coexistence of incompatible systems.
Innovation Solution
A method that identifies legacy digital subscriber lines not supporting vectored capabilities, obtains target power spectral density mask values to reduce interference, and adjusts transmit signal power spectral density accordingly, allowing Vectored DSL lines to function without upgrading or replacing VDSL2 Legacy CPEs, thereby reducing crosstalk and eliminating the need for extensive network upgrades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all VDSL2 Legacy CPEs are upgraded or replaced to implement Vectored-DSL, then far-end crosstalk interference is eliminated and transmission performance is improved, but network upgrade cost and time consumption increase significantly
Solution Approach 1:
The patent applies partial action by implementing vectoring control only for vectored CPEs while allowing legacy CPEs to continue operating without upgrading. The network operator can selectively enable vectoring for specific CPEs that support it, achieving crosstalk cancellation for those lines without requiring universal upgrades across the entire network infrastructure
Solution Approach 2:
The patent changes the operational parameters of the DSLAM by introducing separate vectoring control mechanisms that can be independently activated. By modifying parameters such as power spectral density masks and enabling/disabling vectoring modes for different CPEs, the system achieves improved transmission performance for vectored lines while maintaining compatibility with legacy equipment
2Reliability
If all VDSL2 Legacy CPEs are upgraded or replaced to implement Vectored-DSL, then far-end crosstalk interference is eliminated and transmission performance is improved, but network upgrade cost increases
Solution Approach 1:
The patent implements partial upgrading where only the DSLAM is enhanced with vectoring control capabilities while CPEs can remain in their legacy state. This selective approach allows the network operator to invest in vectoring technology only where needed, avoiding the prohibitively high cost of replacing all CPEs across the network
Solution Approach 2:
The enhanced DSLAM is designed with multi-functionality to support both vectored CPEs and legacy CPEs simultaneously. The vectoring control unit can dynamically adjust its operation based on the capability of connected CPEs, providing crosstalk cancellation when vectored CPEs are present while maintaining backward compatibility with legacy equipment
3Ease of manufacture
If Vectored-DSL is implemented without upgrading legacy CPEs, then network upgrade cost is reduced, but compatibility issues arise between vectored and legacy lines
Solution Approach 1:
The patent segments the network into distinct operational domains: vectored CPEs that participate in joint sending/receiving with crosstalk cancellation, and legacy CPEs that operate independently without vectoring. The DSLAM acts as the segmentation boundary, applying different transmission modes and power spectral density masks to different line groups, thereby avoiding compatibility conflicts while enabling cost-effective partial upgrading
Data Source
Figure 1a~1b
Figure 1c~2
Figure 3~4a
AI summary
The present invention provides a method, an apparatus, and a system for reducing digital subscriber line interference, so as to reduce, as much as possible, or eliminate an influence of a legacy line on a vectored line in a digital subscriber line system. The method includes: identifying at least one legacy digital subscriber line in a digital subscriber line DSL legacy line set; obtaining a target power spectral density mask value of the legacy digital subscriber line; and reducing power spectral density of a transmit signal on the legacy digital subscriber line according to the target power spectral density mask value. The method according to embodiments of the present invention can achieve an effect of eliminating far end crosstalk caused on a Vectored DSL line without upgrading or replacing a VDSL2 Legacy CPE, thereby reducing time consumed by the upgrade, and eliminating human and material (such as device) costs caused by the upgrade.