Full-Duplex Wired Communication Controller Mitigating Near-End Crosstalk
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Solution Overview
Problem
Full-duplex transmission over wired media faces significant challenges due to severe Near-End crosstalk (NEXT) impairments, which cannot be mitigated through joint signal coordination, leading to substantial downstream data rate losses up to 90%.
Innovation Solution
A communication controller dynamically configures communication units to operate in multiple full-duplex modes using non-overlapping subsets of transmission resources, employing multi-user optimization algorithms to determine transmit power profiles that prioritize either downstream or upstream communications, and adjusts resources based on traffic metrics to achieve optimal aggregate data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex transmission is implemented to double aggregate data rate, then productivity is improved, but Near-End crosstalk (NEXT) impairments worsen downstream reception
Solution Approach 1:
The transmission resources are segmented into multiple non-overlapping subsets, with each subset assigned to different full-duplex communication profiles. This segmentation allows the system to divide the harmful NEXT interference into manageable portions that can be handled by different power profiles, preventing any single profile from being overwhelmed by total interference while maintaining high aggregate data rates across all segments.
Solution Approach 2:
The system dynamically switches between multiple full-duplex communication profiles based on traffic conditions and interference levels. Each profile has different downstream and upstream power allocations, allowing the system to adapt to changing NEXT impairment conditions while maintaining optimal aggregate throughput. This dynamic adaptation resolves the contradiction by adjusting power distribution in response to real-time interference conditions.
2Reliability
If transmit power is increased to compensate for NEXT impairments, then reliability is improved, but energy consumption increases
Solution Approach 1:
The system changes power allocation parameters by switching between different full-duplex communication profiles. Instead of continuously increasing power to combat NEXT, the system selects from predefined power profiles with different downstream/upstream allocations. This allows reliable downstream reception by choosing profiles with higher downstream power when needed, while avoiding excessive energy consumption by not always using maximum power profiles.
Solution Approach 2:
The dynamic selection of power profiles based on traffic metrics and interference conditions ensures that transmit power is increased only when necessary for reliability. The system adapts power consumption to actual needs rather than maintaining high power levels continuously, thus improving downstream reception quality when required while minimizing unnecessary energy consumption during lighter load conditions.
3Adaptability or versatility
If multiple full-duplex communication profiles are used to mitigate NEXT, then adaptability is improved, but device complexity increases
Solution Approach 1:
The communication controller is segmented into modules that handle different aspects of multi-profile management independently. Each full-duplex communication profile is treated as a separate configurable entity with its own power allocation parameters. This modular segmentation allows the controller to manage multiple profiles without requiring complete redesign of the control architecture, thus improving adaptability while controlling complexity through systematic organization.
Solution Approach 2:
The communication controller is designed with universal functionality to handle multiple full-duplex communication profiles through a unified framework. The same controller infrastructure manages all profiles, switching between them based on conditions rather than requiring separate control mechanisms for each profile. This multi-functionality approach provides the flexibility to adapt to different traffic conditions while avoiding the complexity of multiple independent control systems.
Data Source
AI summary
The present invention relates to a communication controller (131; 132) and method for controlling communications between an access node (101; 102) and a plurality of remote communication units (211; 212) coupled to the access node via at least one wired transmission medium (20; 40). At least one communication unit (111, 211; 112, 212) of the access node and of the plurality of remote communication units is configured to operate in full-duplex mode according to a first full-duplex communication profile (OP1) when using a first subset of transmission resources (TSSET1; TONESET1) selected from a whole set of transmission resources available for communication over the at least one transmission medium, and according to a second full-duplex communication profile (OP2) when using a second non-overlapping subset of transmission resources (TSSET2; TONESET2) selected from the whole set of transmission resources. The first full-duplex communication profile includes first downstream and upstream transmit power profiles (PSDDS1, PSDUS1) to achieve first aggregate downstream and upstream data rates (DSMAX1, USMIN1; DSMAX2, USMIN2) over the at least one transmission medium, and the second full-duplex communication profile includes second downstream and upstream transmit power profiles (PSDDS2, PSDUS2) to achieve second aggregate downstream and upstream data rates (USMAX1, DSMIN1; USMAX2, DSMIN2) over the at least one transmission medium distinct from the respective first aggregate downstream and upstream data rates. The present invention also relates to a so-configured full-duplex communication unit.