DSL Vectoring Group Crosstalk Management via Time Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Crosstalk between vectoring groups in DSL systems degrades performance, as existing vectoring technologies are limited by the maximum vectoring group size and cannot effectively cancel inter-group crosstalk, leading to reduced signal quality and data rates.
Innovation Solution
A method and device that determine a shared resource allocation interval (RAI) into normal operation and discontinuous operation intervals, allowing all vectoring groups to transmit during part of the RAI and fewer groups during the DOI, optimizing resource allocation based on transmission loads to minimize crosstalk and maximize throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vectoring groups are limited by maximum vectoring group size, then intra-group crosstalk cancellation is effective, but inter-group crosstalk cannot be cancelled and degrades performance
Solution Approach 1:
The patent segments the transmission time into different intervals (first interval and second interval) to manage multiple vectoring groups. During the first interval, a first subset of vectoring groups transmits while the second subset remains silent, eliminating inter-group crosstalk. This time segmentation allows more than the maximum number of vectoring groups to coexist by alternating their transmission opportunities.
Solution Approach 2:
The patent implements periodic transmission patterns where vectoring groups are assigned to transmit in alternating time intervals. The network element periodically switches between different subsets of vectoring groups, creating a cyclic transmission schedule that ensures each group gets transmission opportunities while avoiding simultaneous transmission that would cause inter-group crosstalk.
2Productivity
If all vectoring groups transmit simultaneously, then system throughput is maximized, but inter-group crosstalk degrades signal quality
Solution Approach 1:
The patent divides the transmission opportunity into temporal segments, assigning different vectoring groups to different time intervals. This segmentation allows the system to achieve high throughput by having multiple groups transmit in sequence rather than simultaneously, eliminating the harmful inter-group crosstalk that would occur with simultaneous transmission.
Solution Approach 2:
The patent dynamically allocates transmission time to different vectoring groups based on their transmission loads and requirements. The network element determines optimal allocation intervals that balance throughput maximization with crosstalk avoidance, adjusting the transmission schedule dynamically rather than using a fixed pattern.
3Use of energy by moving object
If resource allocation is optimized based on transmission loads, then power consumption is reduced, but system complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the network element monitors transmission loads from different vectoring groups and uses this information to dynamically adjust resource allocation. The system receives feedback about actual transmission requirements and optimizes the allocation intervals accordingly, reducing power consumption by having groups transmit only when necessary while managing the complexity through automated load assessment.
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
Enables efficient crosstalk cancellation and resource allocation, allowing multiple vectoring groups to coexist, improving signal quality, peak rates, and reducing power consumption, while maintaining low residual crosstalk levels and high system performance.
Implementation Method 1
Crosstalk refers to the electromagnetic coupling between neighboring twisted pairs
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Methods, systems, and apparatus for crosstalk avoidance in a telecommunications network are disclosed. In one aspect a method includes determining, by a network element and for each vectoring group from multiple vectoring groups, a transmission load of the vectoring group based on transmission loads of links within the vectoring group; identifying, by the network element, a resource allocation interval (RAI) that is shared by the multiple vectoring groups; determining, based on the transmission load of each vectoring group and by the network element, a first portion of the RAI that will be a normal operation interval (NOI) and a second portion of the RAI that will be a discontinuous operation interval (DOI); transmitting, by the network element, data over all of the multiple vectoring groups during at least a portion of the NOI; and transmitting, by the network element, data over fewer than all of the vectoring groups during the entire DOI.