Power Saving Link States in Vectored TDD Systems
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Solution Overview
Problem
DSL technologies, such as G.fast, face challenges in reducing power consumption during idle periods, leading to wastage of power as transceivers remain always ready, and existing power saving states do not effectively manage power usage across multiple subscriber lines without increasing far-end crosstalk.
Innovation Solution
Implementing a power management system that determines power-saving states for transceiver units, coordinating data transmission to avoid crosstalk, and adjusting vectoring coefficients to enable discontinuous operation, allowing transceivers to switch off during inactive symbol positions, thereby reducing power consumption of both analog and digital components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transceivers operate continuously to maintain readiness for data transmission, then system reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by enabling transceivers to operate discontinuously - switching between active and power-saving states based on traffic conditions. The system maintains readiness by periodically activating transceivers only when data transmission is required, rather than operating continuously. This resolves the contradiction by reducing power consumption while maintaining system reliability through on-demand activation.
Solution Approach 2:
The patent applies dynamics by making the transceiver operational state variable rather than fixed. The system dynamically adjusts transceiver states based on real-time traffic conditions, transitioning between full operation, partial operation, and power-saving modes. This dynamic adaptation allows the system to maintain reliability when needed while minimizing power consumption during idle periods.
2Use of energy by moving object
If power saving states are implemented to reduce power consumption, then energy efficiency is improved, but far-end crosstalk increases
Solution Approach 1:
The patent applies preliminary action by proactively coordinating transceiver state transitions across multiple lines before they occur. The system predicts traffic patterns and pre-coordinates power-saving state activations, ensuring that crosstalk-generating transitions are synchronized or staggered to minimize interference. This preliminary coordination reduces far-end crosstalk while enabling power savings.
Solution Approach 2:
The patent implements feedback mechanisms to monitor far-end crosstalk levels and adjust transceiver coordination accordingly. The system continuously measures crosstalk impact and dynamically modifies the timing and duration of power-saving state transitions to maintain crosstalk within acceptable thresholds while maximizing power consumption reduction.
3Use of energy by moving object
If transceivers switch to power-saving states during idle periods, then power consumption is reduced, but data transmission efficiency may be affected
Solution Approach 1:
The patent applies preliminary action by pre-coordinating transceiver wake-up and activation sequences. When traffic is detected or predicted, the system proactively activates transceivers in advance of actual data transmission needs, ensuring immediate readiness without prolonged idle operation. This eliminates startup delays while maintaining power-saving benefits during genuine idle periods.
Solution Approach 2:
The patent uses dynamics to create flexible, adaptive transceiver operation modes. The system dynamically adjusts the duration and timing of power-saving states based on real-time traffic conditions, ensuring that transceivers remain active just long enough to handle data transmission efficiently before returning to power-saving modes. This dynamic optimization balances power consumption with transmission efficiency.
Data Source
AI summary
An apparatus comprising a first transceiver unit (TU) for coupling to a first subscriber line, at least one next TU for coupling to at least one next subscriber line, and a processor coupled to the first TU and the at least one next TU, wherein the processor is configured to determine a link state in which data transmission is disabled for the duration of one or more symbols in a superframe, instruct the first TU to operate in the determined link state, and coordinate data transmission by the first TU and the at least one next TU to avoid an increase of crosstalk from the first line to the at least one next subscriber line due to the first TU operating in the determined link state.