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Method and arrangement in a DSL vectoring system

A vector and channel coefficient technology, applied in the field of disordered shutdown event processing, which can solve problems such as interruptions

Active Publication Date: 2013-01-30
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can take 30 seconds to retrain the line, which is a considerable disruption eg in IP-TV services

Method used

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  • Method and arrangement in a DSL vectoring system
  • Method and arrangement in a DSL vectoring system
  • Method and arrangement in a DSL vectoring system

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Embodiment Construction

[0030] Briefly, a solution is provided for enabling fast updating of precoders for changed crosstalk channels after eg DSE. A fast channel estimation method is provided to quickly track channel changes and update the precoder accordingly. Fast channel estimation or tracking methods take advantage of the fact that the channel coefficients associated primarily or only with a single line (ie a line subject to some type of disordered event) will have changed.

[0031] The term "out-of-sequence event" will hereafter be used to refer to events such as: i) out-of-order leave or shutdown events, e.g., CPE disconnection or power down, and ii) out-of-order "modified" power-up events, i.e. , after the precoder modification after the out-of-order or shutdown event, and power is restored in the line, for example, for 10 seconds on-going transmission after the out-of-order or shutdown event. A disorderly exit event and a disorderly shutdown event (DSE) are used synonymously. Out-of-order ...

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PUM

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Abstract

Method and arrangement in a Vectoring Control Entity, VCE,for handling disorderly events in a Digital Subscriber Line, DSL, system. The method involves a number of actions, to be performed when a disorderly event occurs on a line min a vectored group of DSL lines, and the transmission on line m is continued. The method comprises obtaining(104)error samples from Customer Premises Equipments, CPEs, connected to other lines in the vectored group of DSL lines. The method further comprises -calculating an estimate of the channel coefficients changed due to the disorderly event,based on the error samples, thus providing a partial channel estimate. Further, the method comprises -modifying (110) a downstream precoder, at least partly based on the partial channel estimate, such that retraining of the other lines in the vectored group due to the disorderly event is avoided. The arrangement is adapted to enable the performance of the above described method.

Description

technical field [0001] The present invention relates to methods and arrangements in DSL (Digital Subscriber Line) systems, in particular to the handling of Disorder Shutdown Events (DSE) in DSL vectoring systems. Background technique [0002] Vectorization technology will be the core technology of the next generation DSL. It eliminates FEXT (Far End Cross Talk) between DSL lines and thus maximizes DSL system performance. Vectoring technology will play a very important role in FTTx (fiber to the node / cabinet / curb / building / home / premise (premise) etc.) business because it enables The line provides 100 Mbps per subscriber in the last hundred meters, ie between the end of the fiber optic network and the CPE (Customer Premises Equipment). [0003] ITU-T (the Telecommunication Standardization Sector of the International Telecommunication Union) has been standardizing the vectorization standard G.993.5 [1], and the first proposal for G.993.5 was approved on April 22, 2010. The el...

Claims

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Application Information

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IPC IPC(8): H04B3/46H04L27/26
CPCH04B3/32H04L27/2601H04M3/18H04B3/487H04M11/062
Inventor P-E.埃里克森吕晨光
Owner TELEFON AB LM ERICSSON (PUBL)