KR20050073850A - Apparatus and method for controlling power density of very high-data rate digital subscriber line system - Google Patents

Abstract

The present invention relates to an apparatus and method for adjusting power density in a VDSL system.

In the present invention, first, the user frequency band of a non-standard user modem that generates crosstalk due to interference with a standard user modem existing in the same binder is adjusted. Then, if the power density per Hz increases due to the adjusted use frequency band, the total amount of transmit power that can lower the increased power density within the standard specification range is calculated. Then, an EOC message including the calculated total transmit power and an operation code for converting the transmit power register of the non-standard user modem into the data write mode is constructed, and then the EOC message is inserted into the non-standard user modem and the inserted operating channel (EOC). Send it through. The transmit power register then transitions to a write mode and updates the transmit power amount to the total transmit power amount calculated.

Through this, it is possible to prevent the performance degradation of the VDSL (VDSL) system due to the generation of crosstalk noise between the user modem using the standard and non-standard power in the same binder.

Description

Apparatus and method for adjusting power density in VDSL system {APPARATUS AND METHOD FOR CONTROLLING POWER DENSITY OF VERY HIGH-DATA RATE DIGITAL SUBSCRIBER LINE SYSTEM}

The present invention relates to an apparatus and a method for adjusting power density in a VDSL system, and more particularly, to an apparatus for adjusting a power density per Hz in a VDSL system according to a frequency band adjustment. And to a method thereof.

In the early stages of introducing services using the VDSL (Very High-data Rate Digital Subscriber Line), there was no standard specification at home or abroad.

This slowed the development of equipment that defined the standard frequency band, which led to the commercial VDSL business using non-standard equipment.

However, when the VDSL equipment conforming to the nonstandard standard, crosstalk interference with the standard VDSL equipment occurs due to the use of the nonstandard frequency when the international standard equipment is introduced. This leads to performance degradation due to interference between VDSL equipment that conforms to standard and nonstandard specifications, respectively.

In order to solve this problem, by adjusting the frequency band of the existing non-standard 2Band VDSL system to the standard frequency band, the interference effect between the equipment is minimized.

In other words, the frequency band adjustment minimizes the effects of crosstalk due to the overlapping of upstream and downstream use frequencies between the non-standard VDSL system and the standard VDSL system.

However, after frequency band adjustment between these standard and non-standard VDSL systems, crosstalk due to interference between standard and non-standard VDSL systems using the same frequency band still occurred. The cause was the difference in power density between standard and nonstandard VDSL systems.

In other words, the difference in power density per Hz is that when the high power system and the low power density system are accommodated in the same binder, the high power equipment degrades the performance of the low power equipment.

A display example of a result of power density increase according to before / after such use frequency band adjustment is attached to FIG. 1.

 1 is a diagram illustrating a power density distribution before and after use frequency band adjustment according to the prior art.

As shown in FIG. 1, as a result of reducing the frequency band of a non-standard 2-band VDSL system from 3.5 MHz to 0.8 MHz, the average power density of the non-standard 2-band VDSL system is a standard power density (-55 dBm / Hz to -53 dBm / Hz). We can see that it is about 6dBm / Hz higher than).

This is because the total power stored in the Non Volatile Random Access Memory (NVRAM) of the user-modem VDSL Terminal Unit-Remote (VTU-R) modem, even though the total amount of power should be reduced as the frequency band used is reduced. Because there is no change in sum, the power density per Hz is increased across the up band.

Therefore, there is an urgent need for an apparatus and a method capable of adjusting an appropriate total transmission power according to a frequency band adjustment and adjusting the extracted total transmission power to a standard power density.

The technical problem to be solved by the present invention is to solve this problem, by updating the value of the transmit power register in the user modem using the non-standard power to the standard amount of power, between the user modem using the standard and non-standard power in the same binder, respectively An object of the present invention is to provide an apparatus and method for adjusting power density in a VDSL system, which can prevent performance degradation of a VDSL system due to crosstalk noise.

In addition, the present invention in the VDSL (VDSL) system that can configure the EOC message for updating the value of the transmit power register to send to the non-standard user modem, eliminating the need to visit the user's home to change the amount of power To provide a power density adjusting device and a method thereof.

The apparatus for adjusting power density in a VDSL system according to a feature of the present invention for achieving the above object includes a VDSL including a user modem (MODEM) of standard and non-standard specifications existing in the same binder. An apparatus for adjusting power in a system, the apparatus comprising: a data adjusting / sensing unit configured to detect an increase in power density of the non-standard user modem according to the adjusted use frequency band after adjusting a use frequency band of the non-standard user modem; A power density calculator for calculating a total amount of transmit power of a non-standard user modem capable of preventing interference between standard user modems due to the increased power density in the adjusted use frequency band; An EOC message constructing unit for constructing an EOC message including the calculated total amount of transmission power; And a power density adjusting unit for transmitting the configured EOC message to the non-standard user modem to update the transmit power register value of the non-standard user modem to the calculated total amount of transmit power.

In addition, the VDSL system according to an aspect of the present invention adjusts the frequency band of the non-standard user modem, and then adjusts the data to sense the increase in power density of the non-standard user modem according to the adjusted frequency band. Sensing unit; A power density calculator for calculating a total amount of transmit power of a non-standard user modem capable of preventing interference between standard user modems due to the increased power density in the adjusted use frequency band; An EOC message constructing unit configured to construct an EOC message including an calculated total transmit power and an operation code for transitioning a transmit power register having data relating to the transmit power of the non-standard user modem to a data write protocol state; A power density adjustment unit configured to transmit the configured EOC message to the non-standard user modem; And at least one non-standard user modem for updating the transmit power amount of the transmit power register to the calculated total transmit power according to the transmitted EOC message.

In addition, a method for adjusting power density in a VDSL system according to a feature of the present invention may be performed in a VDSL system including a user modem (MODEM) of a standard and a non-standard standard existing in the same binder. A power adjustment method, comprising: a) detecting an increase in power density of the non-standard user modem; b) calculating a total amount of transmit power of a non-standard user modem that can prevent interference between standard user modems due to the sensed power density increase; c) constructing an EOC message including the calculated total transmit power and an operation code for transitioning the transmit power register of the non-standard user modem to a data write protocol state; And d) transmitting the configured EOC message to the transmit power register to update the transmit power amount of the transmit power register to the calculated total transmit power amount.

In addition, a recording medium storing a program according to an aspect of the present invention, a recording including a power adjustment method in a VDSL system including a user modem (MODEM) of the standard and non-standard standards existing in the same binder. A medium, comprising: a) detecting a rise in power density of the non-standard user modem; b) calculating a total amount of transmit power of a non-standard user modem capable of preventing interference with the standard user modem due to the sensed power density increase; c) constructing an EOC message including the calculated total transmit power and an operation code for transitioning the transmit power register of the non-standard user modem to a data write protocol state; And d) transmitting the configured EOC message to the transmit power register to update the transmit power amount of the transmit power register to the calculated total transmit power amount. It is characterized by.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

FIG. 2 is a view schematically illustrating an apparatus for adjusting power density in a VDSL system according to an embodiment of the present invention.

As shown in FIG. 2, the apparatus 200 for power density adjustment in the VDSL system 500 according to an embodiment of the present invention is a DSLAM (Digital Subscriber Ling Access Multiplexer) of a telephone station 200 (aka telephone station modem). , Hereinafter referred to as 'DSLAM', and forms a structure connected to the first to nth user modems 401 to 100n through the wired / wireless communication network 300, respectively. The first to n-th user modems 401 to 100n each include a transmit power register a1 to an.

As such, the embodiment of the present invention will only refer to the transmit power register required for power density adjustment. However, this is not limited to the present invention, and each user modem includes other registers (data registers, etc.).

The first to n-th user modems 401 to 100n include at least one user modem according to a standard standard, and at least one user modem (VDSL terminal unit-remote modem) according to a non-standard standard. do. User modems conforming to these and non-standard specifications exist in the same binder.

Hereinafter, an embodiment of the present invention describes a method for adjusting power density per Hz of at least one non-standard user modem existing in the same binder as a standard user modem.

First, the power density adjusting device 200 constituting such a structure will be described in detail. First, when user modems complying with standard and non-standard standards in the same binder exist together, power density for preventing crosstalk due to mutual interference between user modems The adjusting device 200 adjusts the use frequency band of the user modem conforming to the non-standard specification. That is, the frequency band used is reduced.

Then, the power density adjusting device 200 detects an increase in power density per Hz due to the reduction of the use frequency band. At this time, the power density adjusting device 200 is an in-service and out-of-service for each user modem through an embedded operation channel established between the non-standard user modem and the DSLAM. service), retrieve and change the status information of the user modem and VDSL related parameters. That is, the power density per Hz per user modem is detected through the inserted operating channel.

Thereafter, the power density adjusting device 200 calculates the total amount of transmission power for lowering the increased power density per Hz within a standard specification range. This calculation process will be described later in detail.

Then, in order to change the calculated total transmit power amount to the value of the transmit power register of the non-standard user modem in the subscriber's home, the power density adjusting apparatus 200 sends a command message to the transmit power register of the non-standard user modem through the inserted operating channel. (Hereinafter referred to as 'EOC message' for convenience).

For reference, the transmit power register has state or performance parameter values of non-standard user modems and basic data for link establishment. The maximum transmission power transmitted by the non-standard user modem is stored.

In addition, the EOC message includes a data write operation code for switching the transmit power register of the non-standard user modem to the write mode and a data frame for the calculated total amount of transmit power. That is, the data write operation code shifts the transmit power register of the non-standard user modem to the data write protocol state, and the state transitioned transmit power register changes the total transmit power calculated according to the received data frame. .

As such, the power density adjusting apparatus of the VDSL system according to the embodiment of the present invention is a non-standard user modem that generates a noise crosstalk phenomenon with a standard user modem by increasing the power density per Hz according to the reduction of the use frequency band. Update the total transmit power to the standard transmit power.

By doing so, the present invention prevents crosstalk noise between standard and non-standard user modems in the same binder, thereby increasing the performance of a VDSL system due to an increase in link truncation, cyclic redundancy check (CRC) errors, and link instability. Prevent degradation.

In addition, the present invention, in updating the total transmit power of the non-standard user modem to the standard transmit power, transmits the EOC message through the inserted operating channel established between the DSLAM and the non-standard user modem without visiting the user's home. The transmission power register value in the non-standard user modem is updated through the sent EOC message.

Then, the configuration of the power density adjusting device constituting such a structure will be described through the accompanying drawings.

FIG. 3 is a diagram illustrating in detail a power density adjusting apparatus in the VDSL system illustrated in FIG. 2.

As shown in FIG. 3, the power density adjusting apparatus 100 according to the embodiment of the present invention includes a data adjusting / detecting unit 110, a power density calculating unit 120, an EOC message constructing unit 130, and a power density adjusting unit. 140.

In more detail, first, the data adjusting / detecting unit 110 adjusts the use frequency bands of at least one standard and non-standard user modems 401 to 400n, and detects an increase in power density due to such use frequency band adjustments.

That is, the data adjusting / detecting unit 110 transmits an environment file for adjusting a frequency band used through an inserted operating channel set between the DSLAM and the non-standard user modem, and then receives the data from the non-standard user modem according to the transmitted environment file. It detects power density per non-standard user modem by receiving data about power density per Hz.

The power density calculator 120 calculates the total amount of transmit power of the non-standard user modem in order to lower the power density per Hz of the non-standard user modem (at least one or more non-standard user modems) within a standard specification range. That is, the power density calculation unit 120 calculates a standard total transmission power amount that can prevent the occurrence of crosstalk noise with a standard user modem.

In detail, when the data adjusting / detecting unit 110 reduces the frequency band used by the non-standard user modem from 3.13 MHz to 0.8 MHz, the power density calculating unit 120 uses the standard power density (-55 dBm / Hz to -53 dBm). The total transmit power of the non-standard user modem to satisfy the maximum value of -53dBm / Hz is calculated by Equation 1 below.

[Equation 1]

(X) dBm-10 × log (0.8 × 10 ⁶ ) dB <-53dBm / Hz

In this case, log (0.8 × 10 ⁶ ) dB is a logarithmic operation of 0.8MHz, which is a frequency band used.

According to Equation 1, it can be seen that the total transmission power of the non-standard user modem should be 6 dBm or less at 0.8 MHz. In other words, if the total transmission power of the non-standard user modem is 6dBm or more, the average of the total transmission power is lowered to prevent the performance degradation of the VDSL system caused by crosstalk noise with the non-standard user modem.

The EOC message constructing unit 130 constructs an EOC message for changing the transmit power register value of the non-standard user modem to the total amount of transmit power calculated. The detailed configuration of the EOC message will be described later in the drawings.

The power density adjusting unit 140 transmits the configured EOC message to the transmit power register of the non-standard user modem through the inserted operation channel, so that the transmit power register updates the total amount of transmit power to the standard power density through the received EOC message. .

An operation process of the power density adjusting device constituting such a configuration will be described with reference to the accompanying drawings.

FIG. 4 is a flowchart illustrating an operation process of the power density adjusting device of FIG. 3 in detail.

As shown in FIG. 4, the data adjusting / detecting unit 110 of the power density adjusting apparatus 100 according to the embodiment of the present invention adjusts the frequency band used by a non-standard user modem existing in the same binder as the standard user modem. Transfer the environment file (S410). At this time, the data adjusting / detecting unit 110 transmits the environment file through the inserted operating channel set between the DSLAM and the non-standard user modem.

Thereafter, the data adjusting / detecting unit 110 detects an increase in power density for each non-standard user modem through power density-related data per Hz received from the non-standard user modem according to the transmitted environment file (S420).

Thereafter, the power density calculating unit 120 calculates the total amount of transmission power that is the maximum limit of the non-standard user modem in order to lower the power density per Hz to fall within the standard specification range (S430). In other words, the maximum limit of the transmit power register is calculated to avoid interference with the standard user modem.

This, power calculation process follows the above-mentioned [Equation 1]. That is, the power density calculator 120 calculates the total amount of transmit power according to the value &quot; standard power density &quot; converted from the maximum threshold-adjusted use frequency to a log operation.

Thereafter, the EOC message constructing unit 130 constructs an EOC message that can change the transmit power register value of the non-standard user modem based on the calculated total transmit power amount (S440). A display example of such an EOC message is shown in FIG. 5.

5 is a diagram illustrating a configuration of an EOC message according to an embodiment of the present invention.

As shown in FIG. 5, an EOC message according to an embodiment of the present invention includes a data write operation code for converting a transmit power register of a non-standard user modem to a write mode and a data frame for the calculated total amount of transmit power. do. A display example of such a data write operation code is shown in FIG.

As illustrated in FIG. 6, the data write operation code may convert a predetermined number of registers into a write mode or read data from a corresponding register.

Thereafter, the power density adjusting unit 140 transmits the EOC message to at least one non-standard user modem (S450), and the transmit power register in the non-standard user modem switches to the write mode and then uses the total amount of transmit power received thereafter. Update to the amount of power (S460). A display example of the result of the updated amount of power consumption is shown in FIG.

FIG. 7 is a graph illustrating a power density adjustment result in a VDSL system according to an embodiment of the present invention.

As shown in FIG. 7, when the transmit power amount of the transmit power register is adjusted to the total calculated transmit power amount (for example, 6 dBm), the resulting power density per Hz is also changed to the standard power density (about -53 dBm / kV). It can be seen that the change. However, this is the result of power adjustment in the adjusted used frequency band (0.13 GHz).

As such, the apparatus and method for adjusting power density in a VDSL system according to an embodiment of the present invention prevent crosstalk noise generation due to mutual interference between user modems using standard and nonstandard power in the same binder, respectively. To do this, the transmit power register value in the user modem using non-standard power is updated to the standard power amount. Through this, the present invention prevents performance degradation of VDSL system due to crosstalk noise generation between standard and non-standard user modems.

In addition, the present invention constructs an EOC message for updating the value of each transmit power register and sends it to the corresponding non-standard user modem, thereby eliminating the need to visit the user's home and change the amount of power.

The drawings and detailed description of the invention are exemplary only, and are used for the purpose of illustrating the invention only, and are not intended to be limiting or to limit the scope of the invention described in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

An apparatus and a method for adjusting power density in a VDSL system according to the present invention provide a transmission in a user modem that uses non-standard power to prevent crosstalk noise caused by interference between standard and non-standard user modems in the same binder. By updating the value of the power register with a standard amount of power, it is possible to prevent performance degradation of the VDSL system due to crosstalk noise between standard and nonstandard user modems.

In addition, the present invention is configured to send an EOC message for updating the value of the transmit power register to the non-standard user modem, thereby eliminating the hassle of having to visit the user's home to change the amount of power.

1 is a diagram illustrating a power density distribution before and after use frequency band adjustment according to the prior art.

FIG. 2 is a view schematically illustrating an apparatus for adjusting power density in a VDSL system according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating in detail a power density adjusting apparatus in the VDSL system illustrated in FIG. 2.

FIG. 4 is a flowchart illustrating an operation process of the power density adjusting device of FIG. 3 in detail.

5 is a diagram illustrating in detail the configuration of an EOC message according to an embodiment of the present invention.

6 is a diagram illustrating in detail the configuration of a data write operation code according to an embodiment of the present invention.

FIG. 7 is a graph illustrating a power density adjustment result in a VDSL system according to an embodiment of the present invention.

Claims (10)

In the power control device in a VDSL system including a standard and non-standard user modem (MODEM) existing in the same binder, A data adjusting / sensing unit for adjusting an increase in power density of the non-standard user modem according to the adjusted use frequency band after adjusting the use frequency band of the non-standard user modem; A power density calculator for calculating a total amount of transmit power of a non-standard user modem capable of preventing interference between standard user modems due to the increased power density in the adjusted use frequency band; An EOC message constructing unit for constructing an EOC message including the calculated total amount of transmission power; And A power density adjustment unit for transmitting the configured EOC message to the non-standard user modem to update the transmit power register value of the non-standard user modem to the calculated total amount of transmit power. Power regulation apparatus in the VDSL (VDSL) system comprising a. According to claim 1, The power density calculation unit, the following equation Total transmit power-logarithm of the adjusted use frequency <standard power density And calculating a total amount of transmit power of the non-standard user modem according to the present invention. According to claim 1, The EOC message is And an operation code for translating the transmit power register of the non-standard user modem to a data write protocol. According to claim 1, The data adjustment / detection unit, And transmitting an environment file including a frequency band used by the non-standard user modem to the non-standard user modem, and receiving an environment file from the non-standard user modem including data regarding the increased power density. Power regulation device in a (VDSL) system. According to claim 1, The power density adjusting unit, And transmitting the configured EOC message through an embedded operation channel interconnected with the non-standard user modem. A data adjusting / sensing unit for adjusting an increase in power density of the non-standard user modem according to the adjusted use frequency band after adjusting the use frequency band of the non-standard user modem; A power density calculator for calculating a total amount of transmit power of a non-standard user modem capable of preventing interference between standard user modems due to the increased power density in the adjusted use frequency band; An EOC message constructing unit configured to construct an EOC message including an calculated total transmit power and an operation code for transitioning a transmit power register having data relating to the transmit power of the non-standard user modem to a data write protocol state; A power density adjustment unit configured to transmit the configured EOC message to the non-standard user modem; And At least one non-standard user modem for updating the transmit power amount of the transmit power register to the calculated total transmit power according to the transmitted EOC message VDSL system comprising a. In the power adjustment method in a VDSL system including a standard and non-standard user modem (MODEM) existing in the same binder, a) detecting an increase in power density of the non-standard user modem; b) calculating a total amount of transmit power of a non-standard user modem that can prevent interference between standard user modems due to the sensed power density increase; c) constructing an EOC message including the calculated total transmit power and an operation code for transitioning the transmit power register of the non-standard user modem to a data write protocol state; And d) transmitting the configured EOC message to the transmit power register to update the transmit power amount of the transmit power register to the calculated total transmit power amount. Power adjustment method in a VDSL (VDSL) system comprising a. The method of claim 7, wherein Step a) is Transmitting an environment file to a non-standard user modem, the environment file containing a frequency band used by the non-standard user modem; And Receiving an environment file from the non-standard user modem, the environment file including data on the increased power density according to the adjusted use frequency band, when the use frequency band of the non-standard user modem is adjusted according to the transmitted environment file. Power adjustment method in a VDSL (VDSL) system comprising a. The method of claim 8, Step b), Equation below Total transmit power-logarithm of the adjusted use frequency <standard power density Calculating total transmit power of the non-standard user modem according to Power adjustment method in a VDSL (VDSL) system comprising a. A recording medium comprising a power adjustment method in a VDSL system including a standard and non-standard user modem (MODEM) existing in the same binder, a) detecting a power density increase of the non-standard user modem; b) calculating a total amount of transmit power of a non-standard user modem capable of preventing interference with the standard user modem due to the sensed power density increase; c) constructing an EOC message including the calculated total transmit power and an operation code for transitioning the transmit power register of the non-standard user modem to a data write protocol state; And d) A function of transmitting the configured EOC message to the transmit power register to update the transmit power amount of the transmit power register to the calculated total transmit power amount. A computer-readable recording medium having a program recorded thereon.