DSL Resource Scheduling for Vectoring Power Reduction
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Solution Overview
Problem
The high power consumption of G.fast DSL systems, particularly due to the exponential relationship between power consumption and the number of subscriber lines, leads to significant energy wastage, especially when idle symbols are required in transmission timeslots, which is exacerbated by the constraint of simultaneous joint sending and receiving in vectoring technology.
Innovation Solution
Implementing a resource scheduling method that dynamically allocates transmission opportunities based on service traffic and transmission capability information, dividing the TDD frame into normal and discontinuous operation intervals, and adjusting transmission opportunities to minimize idle symbols and power consumption, using the G.9701 standard's DO mode to enable time-sharing sending and reduce the number of active subscriber lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vectoring technology is used to cancel far-end crosstalk in G.fast system, then transmission performance is improved, but power consumption increases exponentially with the number of subscriber lines
Solution Approach 1:
The system segments subscriber lines into different groups based on their service requirements and traffic patterns. Each group can be independently managed and activated, allowing the vectoring processor to focus computational resources only on active groups rather than processing all subscriber lines continuously, thereby reducing overall power consumption while maintaining transmission performance for active lines.
Solution Approach 2:
The system dynamically adjusts the number of active subscriber lines and vectoring processing intensity based on real-time traffic conditions. During low-traffic periods, fewer lines are actively processed; during high-traffic periods, more lines are activated. This dynamic adaptation allows the system to maintain high transmission performance when needed while reducing power consumption during idle periods.
2Reliability
If simultaneous joint sending and receiving is enforced for all subscriber lines in vectoring group, then crosstalk cancellation is effective, but idle symbols increase and energy is wasted
Solution Approach 1:
The system implements periodic activation of subscriber lines based on their service requirements and traffic patterns. Instead of continuous simultaneous joint sending and receiving for all lines, the system periodically activates only those lines that have data to transmit or receive. This periodic action maintains effective crosstalk cancellation for active lines while avoiding energy waste on idle lines.
Solution Approach 2:
The system applies different operational modes to different subscriber lines based on their local conditions. Lines with active traffic maintain full vectoring processing and simultaneous joint sending/receiving for effective crosstalk cancellation. Lines without traffic are placed in idle or sleep mode, eliminating energy waste. This local quality approach ensures that crosstalk cancellation resources are concentrated where needed rather than uniformly applied to all lines.
3Device complexity
If all subscriber lines perform signal sending and receiving simultaneously, then vectoring processing is simplified, but transmission efficiency decreases due to idle symbols
Solution Approach 1:
The system dynamically reconfigures the vectoring processing structure based on the number of active subscriber lines. When fewer lines are active, the system adjusts the processing matrix size and computational complexity accordingly, rather than maintaining fixed full-size processing for all lines. This dynamic adjustment maintains manageable processing complexity while significantly improving transmission efficiency by eliminating idle symbol waste.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces energy consumption by optimizing transmission opportunities, minimizing idle symbols, and lowering the power consumption of the vectoring processor chip, while ensuring that the DSL system adapts to changing service traffic and line rates, thereby improving energy efficiency and reducing operational costs.
Implementation Method 1
As a frequency band used by G.fast becomes wider, far-end crosstalk (FEXT) more severely affects transmission performance of a line, and the crosstalk of a twisted pair is extremely strong at a high frequency. To cancel the crosstalk, a vectoring DSL technology may be used to cancel the far-end crosstalk.
Data Source
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AI summary
A resource scheduling method and apparatus in a DSL system, and a system are provided, to reduce energy consumption of the DSL system. The method includes: determining, according to service traffic information of each subscriber line and transmission capability information of each subscriber line, a transmission opportunity initial value allocated to each subscriber line in a TDD frame; and according to the transmission opportunity initial value of each subscriber line, dividing the TDD frame into a normal operation interval and a discontinuous operation interval, determining a transmission opportunity occupied by each subscriber line in the normal operation interval, and determining a subscriber line group in the discontinuous operation interval and a transmission opportunity occupied by each subscriber line group in the discontinuous operation interval, wherein each subscriber line meets a condition that a difference between a quantity of transmission opportunities finally allocated to the subscriber line and a transmission opportunity initial value allocated to the subscriber line falls within a preset range.