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Method and apparatus for automatically selecting operation mode in XDSL network

An operation mode, automatic selection technology, applied in the field of network communication, can solve problems such as rough method, large rate jump, affecting transmission performance, etc.

Inactive Publication Date: 2006-11-15
HUAWEI TECH CO LTD
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Problems solved by technology

However, this method is based on the uplink handshake signal to infer the line length, and the method selected based on experience is too rough. The main reason is that the attenuation of the uplink signal cannot reliably express the attenuation in the downlink direction and then infer the capacity. The rate of the mode is relatively low, specifically as figure 1 as shown, figure 1 It shows that when this method is used for mode selection switching processing, it will cause a large rate jump at the switching point, which will affect the transmission performance

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  • Method and apparatus for automatically selecting operation mode in XDSL network
  • Method and apparatus for automatically selecting operation mode in XDSL network
  • Method and apparatus for automatically selecting operation mode in XDSL network

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Embodiment Construction

[0060] Such as figure 2 as shown, figure 2 The middle abscissa is the frequency value, and the ordinate is the power spectral density value (DB). The in-band spectrum in various selectable modes is:

[0061] The uplink frequency band of ADSL2+Annex A mode is 25.875~138KHz, the number of tones is 6~31, and the downlink frequency band is: 138KHz~2208KHz, the tone ranges from 32 to 511;

[0062] The uplink frequency band of ADSL2 Annex A mode is the same as ADSL2+Annex A, the downlink frequency band is: 138KHz to 1104KHz, and the tone is from 32 to 255;

[0063] The uplink frequency band (wideband) of ADSL Annex L mode is 25.875~103.5KHz, the number of tones is 6~23, the downlink frequency band is: 138KHZ to 552KHz, and the tones are from 32 to 127.

[0064] The core of the present invention is to select the operating mode by comparing the in-band bit increment and the out-of-band bit increment according to the bit bearing difference caused by the in-band spectrum difference ...

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Abstract

The invention relates to a method and system for automatically selecting operating modes in XDSL network, mainly comprising: firstly, branch unit transmits a group of multimode subcarrier signals to user-end unit; then, according to the subcarrier signals received by the user-end unit, calculating bit number each subcarrier can carry, and according to the bit number, determining bit number each mode can carry; and finally, according to the bit number each mode can carry, determining a mode to be selected. And the invention can implement automatic selection of operating modes according to actual line conditions and can select the best operating mode by training only once. Therefore, the invention does not increase handshaking time and complexity and can improve mode selecting accuracy.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method and device for automatically selecting an operation mode in an XDSL network. Background technique [0002] With the continuous development of xDSL (Various Digital Subscriber Line) technologies, a series of technical standards related to the xDSL technology have been produced. Among them, the ITU-T standard cluster specifically includes: ADSL (Asymmetric Digital Subscriber Line) (G.992.1 / 2), ADSL2 (Second Generation Asymmetric Digital Subscriber Line) (G.992.3), ADSL2+ (downlink bandwidth extended Second-generation asymmetric digital subscriber line) (G.992.5), SHDSL (G.991.2), VDSL (very high-speed digital subscriber line) (G.993.1), VDSL2 (second-generation very high-speed digital subscriber line) and other standards. Moreover, each standard also defines some appendices to meet different business or regional requirements. The more prominent one is ADSL2 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M11/06H04L5/14
CPCH04M11/062H04L5/0044
Inventor 周军
Owner HUAWEI TECH CO LTD
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