Vectoring Groups with Disjoint Frequency Bands
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Solution Overview
Problem
Crosstalk mitigation in Multiple Input Multiple Output (MIMO) wired communication systems, such as DSL, is limited in scenarios with Sub-Loop Unbundling (SLU) where different operators share the same cable, leading to reduced vectoring gains due to uncoordinated network equipment, typically resulting in gains as low as 5 to 10%.
Innovation Solution
Implementing a Frequency Division Duplexing (FDD) technique by dividing an extended frequency range into non-overlapping bands, each assigned to different operators, allowing optimal vectoring gains within those bands without coordination, and using autonomous vectoring processors to mitigate crosstalk between subscriber lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different operators share the same cable binder with Sub-Loop Unbundling (SLU), then network competition and service diversity are improved, but vectoring gains deteriorate to only 5-10% due to uncoordinated network equipment
Solution Approach 1:
The frequency spectrum is segmented into multiple non-overlapping frequency bands, with each band assigned to a specific operator. This segmentation allows each operator to independently apply vectoring techniques within their assigned bands without interference from other operators, thereby restoring vectoring gains to 30-40% while maintaining SLU service diversity.
2Quantity of substance
If the entire frequency range is shared among multiple operators, then frequency resource utilization is improved, but crosstalk mitigation deteriorates due to lack of coordination between operators' vectoring processors
Solution Approach 1:
The frequency range is divided into separate non-overlapping bands allocated to different operators. This segmentation eliminates inter-operator crosstalk by ensuring that only lines from one operator are active in each frequency band, allowing effective crosstalk mitigation within each band while maintaining overall frequency resource utilization.
3Ease of operation
If autonomous vectoring processors are deployed for each operator, then operational independence is improved, but overall system performance deteriorates due to inability to coordinate crosstalk cancellation across operators
Solution Approach 1:
The frequency spectrum is segmented into operator-specific bands, which enables autonomous vectoring processors to operate independently within their assigned bands while achieving optimal system performance. Each processor can fully coordinate crosstalk cancellation for its operator's lines without interference from other operators, thereby maintaining both operational independence and high system performance.
Data Source
AI summary
In one embodiment the method includes assigning a common frequency range over which first sets of carriers are configured for communication over respective ones of a plurality of subscriber lines. The plurality of subscriber lines are dispatched between a plurality of autonomous vectoring processors configured to mitigate crosstalk between subscriber lines coupled thereto, thereby organizing the plurality of subscriber lines into a plurality of distinct vectoring groups. The method includes assigning a plurality of additional disjoint frequency ranges to respective ones of the plurality of vectoring groups over which second sets of carriers are configured for enhanced communication over respective ones of the plurality of subscriber lines. The second sets of carriers are configured over the respective disjoint frequency ranges assigned to the respective vectoring groups which the respective subscriber lines belong to.