DSL Vectoring Group Crosstalk Avoidance
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Solution Overview
Problem
Crosstalk between vectoring groups in DSL systems degrades performance, as existing technologies are limited by the maximum vectoring group size and cannot effectively manage inter-group crosstalk, leading to reduced signal quality and data rates.
Innovation Solution
Implementing crosstalk avoidance and cancellation techniques that allow multiple vectoring groups to coexist by restricting simultaneous transmissions, allocating resources based on fairness criteria, and transitioning between single-group and multi-group transmission modes to optimize throughput and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple vectoring groups transmit simultaneously to increase throughput, then system productivity improves, but inter-group crosstalk increases and degrades signal quality
Solution Approach 1:
The patent implements discontinuous transmission modes where vectoring groups transmit in alternating time periods rather than continuously simultaneously. Single-group transmission mode allows one vectoring group to transmit alone during its allocated time period, while multi-group transmission mode allows multiple groups to transmit simultaneously when interference levels are acceptable. This periodic switching between transmission modes resolves the contradiction by achieving high overall throughput through time-division multiplexing while maintaining low crosstalk during single-group transmission periods.
2Adaptability or versatility
If vectoring group size is increased to accommodate more twisted pair conductors, then system adaptability improves, but crosstalk cancellation effectiveness deteriorates
Solution Approach 1:
The patent divides the total set of twisted pair conductors into multiple smaller vectoring groups, each containing a manageable number of conductors (e.g., 1-16 pairs per group) where crosstalk cancellation remains effective. Instead of attempting to vector all conductors in a single large group, the system creates several independent vectoring groups that can be managed separately. This segmentation allows the system to support a large total number of conductors (high adaptability) while maintaining effective crosstalk cancellation within each smaller group (high reliability).
Solution Approach 2:
The patent implements dynamic configuration of vectoring groups where the system can adaptively adjust which conductors are grouped together and how many groups are active based on traffic conditions and interference levels. The vectoring group configuration is not fixed but can be reconfigured to optimize performance for different scenarios, allowing the system to maintain effective crosstalk cancellation while accommodating varying numbers of active conductors.
3Reliability
If continuous vectoring operations are maintained to ensure low crosstalk levels, then signal quality improves, but power consumption increases
Solution Approach 1:
The patent implements discontinuous vectoring operations where the vectoring function is activated only during transmission periods and deactivated during idle periods. Instead of maintaining continuous vectoring operations that consume power constantly, the system periodically activates vectoring only when data transmission is occurring and deactivates it during idle time. This periodic operation maintains signal quality during transmission while significantly reducing average power consumption compared to continuous operation.
Solution Approach 2:
The patent allows the system to discard (deactivate) vectoring operations during idle periods when no transmission is occurring, and then recover (reactivate) them when transmission is needed. This approach of temporarily discarding the vectoring function during non-critical periods and recovering it when needed maintains signal quality when required while minimizing power consumption during idle times.
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 enhances system performance by maintaining low residual crosstalk levels, achieving high peak rates, and maximizing overall throughput while minimizing resource consumption, thereby improving transmission speed and reliability in DSL systems.
Implementation Method 1
Crosstalk refers to the electromagnetic coupling between neighboring twisted pairs
Data Source
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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; allocating, by the network element, a different transmission interval to each vectoring group from the multiple vectoring groups based on the transmission load of the vectoring group and transmission loads of other vectoring groups in the multiple vectoring groups; and transmitting, during each different transmission interval, at least a portion of the transmission load of the vectoring group that was allocated the different transmission interval.