Vectoring Engine Crosstalk Avoidance in DSL Networks
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Solution Overview
Problem
Existing DSL systems face performance degradation due to inter-group crosstalk between vectoring groups, which current crosstalk cancellation techniques are unable to effectively address.
Innovation Solution
A telecommunications device with a vectoring engine that transmits initialization symbols at configurable locations within a TDD frame, controls transmission over other vectoring groups, and assigns non-overlapping Discontinuous Operation Intervals to prevent data transmission during initialization, allowing simultaneous RMC symbol transmission across all groups without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosstalk cancellation techniques are implemented in vectoring systems, then intra-group crosstalk is cancelled, but inter-group crosstalk between vectoring groups degrades system performance
Solution Approach 1:
The system segments the Discontinuous Operation Interval (DOI) into multiple non-overlapping portions, assigning each vectoring group a specific time slot within the DOI. This temporal segmentation ensures that initialization symbols from different vectoring groups do not transmit simultaneously, thereby eliminating inter-group crosstalk while maintaining intra-group crosstalk cancellation capabilities.
2Ease of operation
If initialization symbols are transmitted over a given vectoring group, then the given line pair is initialized, but data transmission over other vectoring groups causes interference
Solution Approach 1:
The system performs initialization of line pairs at the beginning of each DOI before data transmission commences. By completing initialization procedures in advance during the dedicated initialization portion of the DOI, the system ensures that line pairs are ready for data transmission without causing interference to other vectoring groups during subsequent data transmission phases.
3Quantity of substance
If multiple vectoring groups share the same binder, then capacity is increased, but inter-group crosstalk increases
Solution Approach 1:
The system resolves the conflict of multiple vectoring groups sharing the same binder by transitioning from spatial coexistence to temporal separation. Each vectoring group is allocated specific time slots within the DOI structure, allowing multiple groups to coexist in the same physical binder without interference by operating in different time dimensions.
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 telecommunications device includes a transceiver and a vectoring engine coupled to the transceiver. The vectoring engine can include a vectoring processor and vectoring control entity (e.g., apparatus). The vectoring engine is configured to instruct the transceiver to transmit, over a given line pair of a given vectoring group, initialization symbols at one or more configurable locations of a Time-Division Duplex (TDD) frame. For example, the vectoring engine can instruct the transceiver to transmit the initialization symbols beginning at a first symbol time following transmission, over other line pairs of the given vectoring group, of a Robust Management Channel (RMC) symbol.