Crosstalk Cancellation via Secure Signal Sharing
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Solution Overview
Problem
Interference from alien crosstalk between VDSL2 lines terminated at different DSLAMs operated by different network operators hinders effective data rate achievement due to the inability to perform crosstalk cancellation, as operators are reluctant to share signal copies for privacy concerns.
Innovation Solution
A method where operators share interference data to enable secure modification and transmission of signals, allowing crosstalk cancellation by adding orthogonal vectors to the original signals, ensuring privacy and enabling effective interference reduction without revealing original signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operators share signal copies for crosstalk cancellation, then crosstalk cancellation performance is improved, but signal privacy is compromised
Solution Approach 1:
The patent introduces a trusted third party (TTP) as an intermediary that receives signal copies from operators, performs crosstalk cancellation computations, and returns results without revealing original signals. The TTP acts as a mediator that enables cooperation while preserving privacy through secure multi-party computation protocols.
Solution Approach 2:
The patent uses copies of original signals instead of the signals themselves for processing. Operators send encrypted or transformed copies to the TTP, which processes these copies to generate crosstalk cancellation parameters without accessing the actual private signal data, thus maintaining privacy while achieving the desired effect.
2Reliability
If cable management is performed to route all lines to one DSLAM, then crosstalk cancellation is enabled, but operational complexity and cost increase
Solution Approach 1:
Instead of physically reconfiguring cables to group lines by DSLAM (traditional approach), the patent inverts the approach by keeping the physical topology unchanged and instead implementing virtual grouping through software-based crosstalk cancellation that works across multiple DSLAMs using the TTP architecture.
Solution Approach 2:
The TTP system provides a universal solution that works across multiple DSLAMs and operators without requiring physical reconfiguration. The same crosstalk cancellation mechanism can be applied regardless of how lines are physically terminated, making the system adaptable to various network topologies.
3Productivity
If alien crosstalk is cancelled between DSLAMs, then data rate performance is improved, but operator cooperation is required which is difficult to achieve
Solution Approach 1:
The TTP serves as a neutral intermediary that facilitates cooperation between competing operators without requiring direct trust or coordination between them. Each operator independently interacts with the TTP, which handles the complex coordination and computation, thus lowering the barrier to entry for participation.
Solution Approach 2:
The system allows operators to independently configure their own lines and participate in the crosstalk cancellation system without manual coordination with other operators. The TTP automatically manages the interactions and computations, enabling operators to benefit from alien crosstalk cancellation through self-service configuration.
Data Source
AI summary
A method is described for reducing interferences in communications exchanged along a plurality of communication channels operated by a first operator, caused by one or more alien communication channels operated by a second operator. The method comprises the steps of: (i) providing the second operator with information that relates to interferences experienced at the plurality of communication channels operated by a first operator, due to traffic conveyed along alien communication channels operated by the second operator; (ii) modifying the original signals conveyed by the second operator along the alien communication channels; (iii) sending the modified signals to the first operator; and (iv) applying the modified signals by the first operator to reduce interferences in communications exchanged along the plurality of communication channels and operated by the first operator.