DSL Vectoring Training Time Reduction via Sync Frame Period Adjustment
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Solution Overview
Problem
The existing DSL activation process is excessively long due to the time-consuming vectoring training, which accounts for 64% of the total DSL activation time, and existing methods to shorten this time may introduce noise problems.
Innovation Solution
A method that involves sending a sync frame period indication message from central office equipment to customer premises equipment, allowing for vectoring training within a reduced sync frame period, thereby shortening the vectoring training time without introducing noise issues by maintaining the length of the orthogonal sequence in the sync frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the vectoring training time is reduced to shorten DSL activation time, then the DSL activation time is improved, but noise problems occur such as crosstalk noise cannot be canceled or AWGN cannot be effectively eliminated
Solution Approach 1:
The patent segments the DSL activation process into distinct phases with different sync frame periods: a first sync frame period during the training stage for vectoring training, and a second sync frame period during the data stage for normal operation. By setting the first sync frame period to be shorter than the second, the patent enables accelerated training without compromising the noise cancellation quality that requires sufficient training time, thus resolving the contradiction between speed and noise performance.
Solution Approach 2:
The patent dynamically adjusts the sync frame period based on the operational stage of the DSL connection. During the training stage, a shorter sync frame period is applied to accelerate the process. During the data stage, the sync frame period is extended to ensure proper noise cancellation. This dynamic adjustment allows the system to optimize for speed when needed and for quality when needed, resolving the time-quality tradeoff.
2Loss of time
If the orthogonal sequence length in sync frame is reduced to shorten activation time, then the vectoring training time is improved, but crosstalk noise cancellation capability deteriorates
Solution Approach 1:
The patent changes the parameter of sync frame period duration based on the operational stage. By setting the first sync frame period (training stage) to be shorter than the second sync frame period (data stage), the patent optimizes the training process speed while ensuring that the data stage has sufficient time for effective crosstalk noise cancellation, thus resolving the contradiction between training speed and noise cancellation reliability.
Data Source
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AI summary
Embodiments of the present invention provide a method for activating a DSL, which relates to the field of communications and is capable of shortening vectoring training time, thereby achieving the effect of shortening DSL activation time. The method includes: sending, by a central office equipment, a sync frame period indication message to a customer premises equipment, where a sync frame period indicated by the sync frame period indication message is smaller than a specified sync frame period threshold; receiving, by the central office equipment, a reply message sent by the customer premises equipment in response to the sync frame period indication message, where the reply message indicates whether the customer premises equipment accepts the sync frame period indicated by the sync frame period indication message; and if the reply message indicates that the customer premises equipment accepts the sync frame period, performing, by the central office equipment, vectoring training by using a corresponding sync frame within the sync frame period. The embodiments of the present invention further provide corresponding equipments, a system, and a program product.