xDSL Line Initialization Using Resource Unit Segmentation
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Solution Overview
Problem
The existing xDSL line initialization process is lengthy due to the need for extensive crosstalk cancellation initialization, which requires multiple synchronization symbols and significant time for estimating uplink and downlink crosstalk cancellers and pre-coders, especially when adding new lines to a system with many existing lines.
Innovation Solution
The method involves releasing at least one resource unit on an existing line, performing basic initialization, and then conducting crosstalk cancellation initialization using all resource units, allowing the new line to participate in data transmission and shorten the initialization time by leveraging its existing transmission capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extensive crosstalk cancellation initialization is performed to estimate uplink and downlink crosstalk cancellers and pre-coders, then crosstalk cancellation accuracy is improved, but initialization time increases significantly
Solution Approach 1:
The patent segments the resource units into two groups: a first group used for basic initialization and a second group used for crosstalk cancellation initialization. This segmentation allows the initialization process to be divided into distinct phases, enabling the new line to perform basic initialization quickly while crosstalk cancellation is performed separately, thereby reducing overall initialization time while maintaining accuracy.
Solution Approach 2:
The patent performs basic initialization on the new line using the first group of resource units before completing the crosstalk cancellation initialization. This preliminary action allows the new line to achieve basic data transmission capability early in the process, reducing the waiting time for client devices while the more time-consuming crosstalk cancellation estimation is performed in the background using the second group of resource units.
2Measurement precision
If multiple synchronization symbols are used for crosstalk estimation, then estimation accuracy is improved, but the number of required symbols increases initialization duration
Solution Approach 1:
The patent divides the synchronization symbols into two separate groups: first synchronization symbols for basic initialization and second synchronization symbols for crosstalk cancellation initialization. This segmentation allows the system to use multiple symbols for accurate crosstalk estimation without requiring all symbols to be processed sequentially for a single initialization task, thereby improving accuracy while managing duration.
Solution Approach 2:
The patent uses the first group of synchronization symbols to perform basic initialization before the crosstalk cancellation initialization is complete. This preliminary action allows the system to achieve basic functionality early while the more time-consuming crosstalk estimation using multiple second synchronization symbols is performed subsequently, maintaining accuracy without extending the time until basic data transmission can begin.
3Reliability
If resource units are allocated for crosstalk cancellation initialization, then crosstalk cancellation performance is improved, but available resource units for data transmission are reduced
Solution Approach 1:
The patent segments the resource units into a first group for basic initialization and a second group for crosstalk cancellation initialization. This segmentation ensures that crosstalk cancellation performance is improved through dedicated resource units while the first group remains available for basic data transmission, thereby maintaining productivity during the initialization process.
Solution Approach 2:
The patent performs basic initialization using the first group of resource units before the crosstalk cancellation initialization is complete. This allows data transmission to begin on the first group of resource units while the second group is dedicated to crosstalk cancellation, improving crosstalk cancellation performance without completely sacrificing data transmission capacity during the initialization phase.
Data Source
AI summary
Embodiments of the present invention provide a line initialization method, a device, and a system. The method includes: when a new line is added, releasing at least one resource unit that is on a line at a Showtime stage, so that on the line at the Showtime stage data is transmitted on a remaining resource unit that is obtained after the at least one resource unit is released; performing basic initialization on the new line by using the at least one resource unit or a subset of the at least one resource unit, so that after the basic initialization, data can be transmitted on the new line by using the at least one resource unit or the subset of the at least one resource unit; and performing crosstalk cancellation initialization on the line at the Showtime stage and the new line by using all resource units.