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WO2007036165A1 - Procede et appareil d'affaiblissement diaphonique sur des lignes d'abonnes numeriques - Google Patents

Procede et appareil d'affaiblissement diaphonique sur des lignes d'abonnes numeriques Download PDF

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Publication number
WO2007036165A1
WO2007036165A1 PCT/CN2006/002598 CN2006002598W WO2007036165A1 WO 2007036165 A1 WO2007036165 A1 WO 2007036165A1 CN 2006002598 W CN2006002598 W CN 2006002598W WO 2007036165 A1 WO2007036165 A1 WO 2007036165A1
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WO
WIPO (PCT)
Prior art keywords
line
signal
frequency
parameters
digital subscriber
Prior art date
Application number
PCT/CN2006/002598
Other languages
English (en)
French (fr)
Inventor
Bin Du
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP06791184A priority Critical patent/EP1962437B1/en
Priority to DE602006011784T priority patent/DE602006011784D1/de
Priority to AT06791184T priority patent/ATE455400T1/de
Publication of WO2007036165A1 publication Critical patent/WO2007036165A1/zh
Priority to US12/166,043 priority patent/US8081752B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/02Details
    • H04B3/32Reducing cross-talk, e.g. by compensating
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/08Indicating faults in circuits or apparatus
    • H04M3/12Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/22Arrangements for supervision, monitoring or testing
    • H04M3/26Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
    • H04M3/302Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs
    • H04M3/304Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs and using xDSL modems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/22Arrangements for supervision, monitoring or testing
    • H04M3/26Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/34Testing for cross-talk
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M2201/00Electronic components, circuits, software, systems or apparatus used in telephone systems
    • H04M2201/18Comparators

Definitions

  • the present invention relates to the field of network communication technologies, and in particular, to a method and apparatus for reducing crosstalk between digital subscriber lines. Background of the invention
  • XDSL technology is a transmission technology that transmits high-speed data in telephone twisted pair, including VDSL (very high-speed digital subscriber line) and VDSL2 (second-generation VDSL) standards, and VDSL3 (third-generation VDSL), MIMO in the future.
  • VDSL Multiple Input Output VDSL
  • YECTER VDSL Vector VDSL
  • the structure of the VDSL system is as shown in FIG. 1 , wherein one communication station 1 is located at the central office, which is called the central office communication station VTU-0, and the other communication station 2 is located at the remote end, which is called the remote communication station VTU-R.
  • the two stations communicate through one line.
  • the signal sent by station 1 to station 2 is called the downlink signal, and the opposite direction is called the uplink signal.
  • Site 1 and station 2 respectively support multiple operation modes, and each mode uses different frequency bands.
  • VDSL has different channels defined in each region, but there are generally 4 to 6 channels.
  • Figure 2 shows a typical example of frequency planning in a certain region. Among them, there are 2-3 downlink channels, 2-3.
  • the starting frequency of the second downlink channel (DS2) is generally above 5. 8 MHz.
  • VTU-01 and VTU-R1 are in working state, if the length L1 of line 1 is short and the set operation speed is small, for example, 300 meters can originally transmit 80Mbps downlink, but When only 20Mbps is used, the processing to be used is to reduce the power of each frequency point to reduce the system power consumption. As a result, the downlink transmission power of the VTU-01 will be much lower than the rated power. In this way, crosstalk between adjacent lines can be reduced to some extent.
  • VDSL line initialization will also bring more serious crosstalk to adjacent lines, thus affecting the transmission performance of VDSL lines that are undergoing data transmission.
  • VDSL2 line initialization training is divided into five phases, as shown in Table 1: G. 994. 1 Channel Training Channel analysis Exchange
  • the central office communication station VTU-0 will first issue a 0-P-Channel-Discovery signal.
  • the 0-P-Channel-Discover signal covers almost all frequencies of each channel (such as DS1 and DS2 in Figure 2), and the transmit power of the signal is limited to the rated power.
  • the transmission power of the specifically transmitted channel discovery signal mainly includes the following two cases -
  • DPB0 downlink power reduction
  • VDSL2 will not make DPB0 for the next 0-P-Channel-Discovery signal even if calculated according to DPB0.
  • the 0-P-Channel-Discovery signal is sometimes transmitted at a near rated power, so that the long line L2 in Figure 3 will cause a large crosstalk to the high frequency of the short line L1.
  • the stub is assumed that 200 meters long rated power transmit 0-P-Channel-Di SCOV ery, preclude the use of the frequency plan shown in Figure 2, DSl from 138KHz to 3. 75MHz, DS2 from 5. 8MHz to 8. 5MHz Then, the signal condition of the two-line crosstalk is as shown in FIG. 4.
  • the crosstalk of the DS2 band in the short line is extremely large, and the crosstalk power of some frequency points is even higher than the signal power of the short line, which will transmit the short line of the data being transmitted. Performance has a large impact, for example, greatly increased bit errors, and so on. Summary of the invention
  • the present invention can implement channel discovery on a line.
  • the phase effectively reduces the crosstalk generated by adjacent lines, and effectively ensures the reliability of the data being transmitted in adjacent lines.
  • the present invention provides a method for reducing crosstalk between digital subscriber lines, the method comprising a central office device, a client device, and a line connecting the central office device and the customer premises device, the method comprising:
  • the line parameters are received subcarrier signal strength, and/or frequency response, and/or background noise, and/or parameters obtained from received subcarrier signal strength and/or frequency response and/or background noise calculations.
  • the handshake signal is a handshake signal in G. 994. 1.
  • the processing of acquiring the parameter of the line includes: calculating, during the handshake phase, an electrical length value of the line according to the received subcarrier signal strength;
  • the electrical length value of the line is obtained by a line test instrument test.
  • the process of determining the available frequencies includes:
  • the frequency range of the signals transmitted on the respective lines during the channel discovery phase, the training phase, and/or the channel analysis phase is determined based on the electrical length value.
  • the method further includes: reducing a frequency of an uplink signal and/or a downlink signal transmitted on the line when the electrical length value exceeds a predetermined threshold.
  • the reducing the frequency of the transmitted signal of the line includes: turning off the transmission of the high frequency band signal on the line, and transmitting only the low frequency band signal.
  • the threshold value is a fixed setting or a threshold value that can be modified and updated.
  • the present invention also provides a method for reducing crosstalk between digital subscriber lines, the method comprising: determining parameters of a VDSL line, and determining to send the line according to the parameter value and its corresponding transmit power upper limit value. The transmit power of the signal.
  • the present invention also provides a method for reducing crosstalk between digital subscriber lines, the method involving a central office device, a client device, and a line connecting the central office device and the customer premises device, the method comprising: acquiring the location based on the handshake signal The parameters of the line;
  • the line unavailability frequency is determined based on the obtained line parameters, and the power or power spectral density of the signal other than the unavailable frequency is reduced.
  • the present invention also provides an apparatus for reducing crosstalk between digital subscriber lines, including - a line parameter calculation module: for calculating and determining parameters of the line;
  • Transmit signal processing module Determine the frequency range of the transmitted signal according to the calculated parameter value of the line, and send the signal of the corresponding frequency.
  • the device further includes:
  • Signal processing triggering module for handshake phase, channel discovery phase, training phase and/or channel in the line
  • the analysis phase triggers the transmitted signal processing module.
  • the apparatus is disposed in a central office unit and/or a remote unit of a digital subscriber line.
  • the implementation of the present invention can effectively solve the crosstalk generated by adjacent channels in the channel discovery phase of the VDSL line, thereby ensuring the transmission performance of the VDSL line undergoing data transmission.
  • the implementation of the present invention is implemented based on existing standards, and therefore, the present invention has the advantages of being simple and easy to implement.
  • Figure 1 is a schematic structural view of a VDSL system
  • Figure 2 is a schematic diagram of VDSL channel allocation
  • Figure 3 is a schematic diagram of crosstalk generation in a VDSL system
  • Figure 4 is a schematic diagram of the crosstalk generated in Figure 3
  • Figure 5 is a schematic diagram of signal power when the VDSL line is long
  • FIG. 7 is a schematic structural diagram of a specific implementation of the device according to the present invention. Mode for carrying out the invention
  • Figure 5 shows the VTU-R receive signal. It can be seen that at 1100 meters, the signal power of the received signal in the DS2 (downstream channel) band is lower than 140c!Bm, and the noise received by the general VTU-R is also 140dBm. Because the signal and noise are as large, the DS2 band cannot be used. The data is transmitted, so the high frequency band can be turned off.
  • the present invention implements processing of downlink signals based on the above principles to reduce crosstalk between digital subscriber lines.
  • the same principle, the present invention is also applicable to processing for uplink signals.
  • the environment in which the implementation of the present invention is applied includes a central office device, a client device, and a line connecting the central office device and the client device, and specifically includes:
  • the line parameter is at least one of receiving subcarrier signal strength, frequency response, and background noise, and/or, according to the received subcarrier signal strength and/or a frequency response and/or a parameter obtained by calculating the background noise, such as a line electrical length parameter, etc.
  • the handshake signal is a handshake signal in G.994. 1; Thereafter, determining a line available frequency according to the obtained parameters of the line, and determining a transmitted signal power or a power spectral density according to the available frequency;
  • the transmission of the signal is performed using the available frequency based on the determined transmit signal power or power spectral density.
  • the line unavailable frequency may be determined according to the obtained line parameters, and the power or power spectral density of the signal other than the unavailable frequency may be reduced to reduce the corresponding high frequency. interference. .
  • the transmit power of the signal transmitted on the line may be determined according to the parameter value and the corresponding transmit power upper limit value, thereby avoiding the High-frequency crosstalk; for example, different rated power upper limits corresponding to each line parameter can be set, and the power used by the transmitted signal is controlled according to the set power upper limit, thereby controlling the crosstalk of the line.
  • Step 61 configuring a predetermined threshold value for adjusting an electrical length of the transmission signal frequency line
  • Step 62 Calculate the electrical length value of the VDSL line that needs to be signaled
  • the electrical length of the line can be obtained.
  • two methods for obtaining the electrical length of the line can be used, but the method is not limited to the two methods.
  • the two methods are specifically:
  • the first method is: in the handshake phase of G. 994, the electrical length of the line can be estimated according to the signal strength of the received TONES according to VTU-0 or VTU-R;
  • the second method is: Through the line test instrument, the electrical length of the estimated line is obtained.
  • Step 63 Determine whether the electrical length value exceeds the predetermined threshold, if yes, proceed to step 64, otherwise, perform step 65;
  • Step 64 Reduce the frequency of signal transmission on the VDSL line, specifically turn off the transmission of the high-band signal, and only send the low-band signal to reduce the high-frequency crosstalk;
  • the electrical length of the estimated line may be compared with a configurable or fixed electrical length threshold of the network management, for example, the threshold may be 1.1 km, when the electrical When the length is greater than or equal to the threshold length, the high-band DS2 cannot be used for data transmission. Therefore, in the 0-P-Channel-Discovery and subsequent related downlink signals, the transmission of the DS2 band with large crosstalk is turned off. Effectively reduce crosstalk of lines;
  • this step can also be applied to the processing of the uplink signal: at the beginning of channel discovery, it can be estimated according to The electrical length of the line is compared to a configurable or fixed threshold (eg 1 km) of the network management.
  • a configurable or fixed threshold eg 1 km
  • US2 upstream channel
  • RP-Channel-Discovery The far-end channel discovery signal
  • subsequent related uplink signals turn off the transmission of the US2 band with large crosstalk, which will effectively reduce the crosstalk of the line.
  • Step 65 Perform normal signal transmission processing
  • the signal may be sent only after the power reduction process, and the specific processing method may include:
  • the corresponding processing procedure is similar to the processing described in steps 61 to 65, mainly when the parameters of the corresponding line do not meet the corresponding threshold requirements (eg, greater than the corresponding threshold), then the line is The signal transmission power is adjusted to reduce the high-frequency crosstalk in the line.
  • the specific implementation scheme can be referred to FIG. 6 and will not be described in detail herein.
  • the present invention has been described above by way of example only in the signal discovery phase of the VDSL line.
  • the present invention can also be applied to the training phase and/or channel analysis phase of the VDSL line.
  • the invention can also set different rated power upper limits corresponding to the electrical lengths of the lines, and control the signal transmission power according to the set power upper limit, thereby controlling the crosstalk of the lines.
  • the present invention also provides an apparatus for reducing crosstalk between digital subscriber lines, the apparatus being disposed in a central unit and/or a remote unit of the line.
  • the structure of the device is as shown in FIG. 7, and specifically includes the following component modules:
  • Line parameter calculation module used to calculate and determine the electrical length of the line and other parameters, specifically can calculate the line parameters according to the received subcarrier signal strength, or can predict the line parameters through the line test instrument; send signal processing module: according to the calculation The determined parameter value of the line determines the frequency range of the transmitted signal, and transmits the signal of the corresponding frequency.
  • the main principle is that when the parameter exceeds the predetermined value, the transmission of the high frequency band signal is turned off, and only the low frequency band signal is transmitted;
  • the transmitting signal processing module is configured to adjust the frequency of signal transmission in the corresponding phase to reduce crosstalk in the line.
  • the present invention can effectively reduce crosstalk between adjacent uplink and downlink signals in the line channel discovery phase.
  • the present invention is implemented based on existing standards, and thus has the advantage of being simple and easy.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephonic Communication Services (AREA)
  • Communication Control (AREA)
  • Interface Circuits In Exchanges (AREA)

Description

降低数字用户线之间串扰的方法及装置 . 技术领域
本发明涉及网络通信技术领域,尤其涉及一种降低数字用户线之间串扰的方法及装 置。 发明背景
XDSL技术是一种在电话双绞线中传输高速数据的传输技术, 其中包括 VDSL (甚高速 数字用户线)和 VDSL2 (第二代 VDSL)标准, 未来还有 VDSL3 (第三代 VDSL) , MIMO VDSL (多输入输出 VDSL) , YECTER VDSL (矢量 VDSL) 等等。
VDSL系统的结构如图 1所示, 其中, 包括一个通信站点 1位于局端, 称为局端通信站 点 VTU- 0, 以及另一个通信站点 2位于远端, 称为远端通信站点 VTU-R, 两站点之间通过 一条线路进行通信。其中, 站点 1发到站点 2的信号称为下行信号, 相反的方向称为上行 信号, 站点 1和站点 2分别支持多种运行模式, 各种模式分别使用不同的频带。
VDSL在各地区定义的频道有所不同, 但一般有 4一 6个频道, 图 2给出的是某一地区 频率规划示意的典型的实例, 其中, 有 2— 3个下行频道, 2— 3个上行频道, 第二个下行 频道(DS2 ) 的起始频率一般在 5. 8MHz以上。
在 VDSL系统中, 有一种情况如图 3所示, 站点之间的两根或多根 VDSL传输线路在一 捆线中互为相邻。 根据信号处理理论可以知道, 频率越高, 线路间的串扰越高, 因此, 图 3所示的场景中两路之间便会出现相应的串扰。 而且, 由 VDSL技术使用频率较高, 因 此, 所述的串扰将更为严重。
为降低 VDSL线路间的串扰, 当 VTU- 01和 VTU- R1处于工作状态, 如果线 1的长度 L1较 短, 而设定的运行的速率较小, 例如, 300米本来可以传 80Mbps下行, 但只设置使用 20Mbps, 则将要釆用的处理是降低各频点的功率以降低系统功耗, 结果是 VTU- 01的下行 发射功率会大大低于额定功率。 这样, 便可以一定程度上降低相邻线路之间的串扰。
在 VDSL系统中, 除了正在工作中的各个相邻线路之间存在串扰外, 当在系统中的
VDSL线路初始化过程中也将会给相邻的线路带来较为严重的串扰,从而影响正在进行数 据传输的 VDSL线路的传输性能。
根据现在 VDSL2草案标准, VDSL2线路初始化训练分为 5个阶段, 具体如表 1所示: G. 994. 1 Channel Training Channel analysis Exchange
Handshake Discovery 训练 信道分析 交换 握手 信道发现
其中, 在信道发现 (Channel Discovery ) 阶段, 局端通信站点 VTU- 0会先发出 0-P- Channel- Discovery (局端信道发现)信号。根据 VDSL2标准, 0-P- Channel- Discovery 信号是覆盖各个频道 (如图 2中的 DS1和 DS2) 的几乎所有频点, 信号的发送功率限制在 额定功率以下。
在信道发现阶段, 具体发送的信道发现信号的发送功率主要包括以下两种情况-
( 1 ) 不对 0-P- Channel-Discovery信号进行 DPB0 (下行功率降低) , 直接发送所述 信号;
(2)如果第二根线较长, 例如为 1. 5公里, 即使根据 DPB0计算, VDSL2也不会对下 行 0-P- Channel- Discovery信号做 DPB0。
因此, 0-P- Channel-Discovery信号有时会以接近额定功率发射, 这样, 图 3中的长 线 L2将对短线 L1的高频会产生较大串扰。
假设其中的短线是 200米, 长线以额定功率发射 0-P-Channel-DiSCOVery, 釆用图 2 所示的频率规划, DS1从 138KHz到 3. 75MHz, DS2从 5. 8MHz到 8. 5MHz, 则两线串扰的信号 情况如图 4所示。 从图 4所示可以看出, 在长线的信道发现阶段, 短线的 DS2频段的串扰 极大, 有些频率点的串扰功率甚至已高于短线的信号功率, 这将对正在传送数据的短线 的传输性能产生较大影响, 例如, 误码大大增加, 等等。 发明内容
本发明的目的是提供一种用于解决下行 0-P-Channel- Discovery信号和以后下行信 号对相邻线路的串扰问题的降低 VDSL线路串扰的方法及装置,本发明可以实现在线路的 信道发现阶段有效降低其对相邻线路产生的串扰, 有效保证相邻线路中正在传输的数据 的可靠性。
本发明的目的是通过以下技术方案实现的:
本发明提供了一种降低数字用户线之间串扰的方法, 该方法涉及局端装置, 用户端 装置以及连接局端装置和用户端装置的线路, 所述的方法包括:
根据握手信号获取所述线路的参数;
根据获得的线路参数确定线路可用频率,并根据可用频率确定发送信号功率或功率 谱密度; 基于确定的发送信号功率或功率谱密度利用可用频率进行信号的发送。
所述的线路参数为接收子载波信号强度、 和 /或频率响应、 和 /或背景噪声, 和 /或 根据接收子载波信号强度和 /或频率响应和 /或背景噪声计算获得的参数。
所述的握手信号为 G. 994. 1中的握手信号。
当所述线路的参数为电气长度值时, 所述的获取所述线路的参数的处理包括: 在握手阶段, 根据接收的子载波信号强度计算线路的电气长度值;
或者, ·
通过线路测试仪器测试获得线路的电气长度值。
所述的确定可用频率的处理包括:
根据所述的电气长度值确定在信道发现阶段、 训练阶段和 /或信道分析阶段在相应 线路上发送的信号的频率范围。
所述的方法还包括: 当所述的电气长度值超过预定的门限值时, 则降低该线路上发 送的上行信号和 /或下行信号的频率。
所述的降低该线路的发送的信号的频率包括: 关闭该线路上的高频段信号的发射, 仅发送低频段信号。
所述的门限值为固定设置或可修改更新的门限值。
本发明还提供了一种降低数字用户线之间串扰的方法, 所述的方法包括: 确定 VDSL线路的参数, 并根据所述的参数值及其对应的发送功率上限值确定该线路 上发送的信号的发射功率。
本发明还提供了一种降低数字用户线之间串扰的方法, 该方法涉及局端装置, 用户 端装置以及连接局端装置和用户端装置的线路, 所述的方法包括- 根据握手信号获取所述线路的参数;
根据获得的线路参数确定线路不可用频率,并降低不可用频率以外的信号的功率或 功率谱密度。
本发明还提供了一种降低数字用户线之间串扰的装置, 包括- 线路参数计算模块: 用于计算并确定线路的参数;
发送信号处理模块: 根据计算确定的线路的参数值确定发送的信号的频率范围, 并 发送相应频率的信号。
所述的装置还包括:
信号处理触发模块: 用于在线路的握手阶段、 信道发现阶段、 训练阶段和 /或信道 分析阶段触发所述的发送信号处理模块。 .
所述的装置设置于数字用户线的局端单元和 /或远端单元中。
由上述本发明提供的技术方案可以看出,本发明的实现可以有效解决 VDSL线路的信 道发现阶段对相邻线路产生的串扰, 从而保证正在进行数据传输的 VDSL线路的传输性 能。 同时, 本发明的实现为基于现有的标准实现, 因此, 本发明还具有简单且易于实现 的优点。 附图简要说明
图 1为 VDSL系统的结构示意图;
图 2为 VDSL频道分配示意图;
图 3为 VDSL系统中的串扰产生示意图;
图 4为图 3中产生的串扰大小示意图
图 5为在 VDSL线路较长时的信号功率示意图;
图 6为本发明所述的方法的具体实现流程图;
图 7为本发明所述的装置的具体实现结构示意图。 实施本发明的方式
根据信号处理理论, 线路越长, 衰减越大。 在一个 1100米长的没有如何抽头 0. 4醒 双绞线, VTU- C用 20. 5dBm下行发射功率,图 5显示了 VTU- R的接收信号。可以看到,在 1100 米时, 接收信号在 DS2 (下行频道)频段的信号功率已低于 140c!Bm, 一般 VTU- R接收的噪 声也有 140dBm, 由于信号和噪声一样大, DS2频段已经不能用于传送数据, 所以可以将 该高频段关掉。
本发明正是基于上述原理实现对下行信号的处理, 以降低数字用户线之间的串扰, 同样原理, 本发明也适用于针对上行信号的处理。
本发明所述的实现方案应用的环境包括局端装置、用户端装置以及连接局端装置和 用户端装置的线路, 具体包括:
首先, 根据握手信号获取所述线路的参数; 其中, 所述的线路参数为接收子载波信 号强度、 频率响应和背景噪声中的至少一项, 和 /或, 根据接收子载波信号强度和 /或频 率响应和 /或背景噪声计算获得的参数, 如线路电气长度参数等; 所述的握手信号为 G. 994. 1中的握手信号; 之后, 根据所述获得的线路的参数确定线路可用频率, 并根据可用频率确定发送信 号功率或功率谱密度;
最后, 基于确定的发送信号功率或功率谱密度利用可用频率进行信号的发送。 本发明中, 在根据握手信号获取所述线路的参数后, 还可以根据获得的线路参数确 定线路不可用频率, 并降低不可用频率以外的信号的功率或功率谱密度, 以降低相应的 高频干扰。 .
本发明中, 在确定数字用户线对应的各线路的参数后, 还可以根据所述的参数值及 其对应的发送功率上限值确定该线路上发送的信号的发射功率, 从而避免线路中的高频 串扰; 例如, 可以设置各线路参数对应的不同的额定功率上限, 并根据设置的功率上限 来控制发送信号采用的功率, 从而控制线路的串扰。
下面将结合附图以电气长度值作为线路的参数为例,对本发明提供的降低数字用户 线之间串扰的方法的具体实现方式进行说明, 以降低 VDSL高频串扰为例, 如图 6所示, 具体包括以下步骤:
步骤 61 : 配置调整发送信号频率线路的电气长度的预定门限值;
步骤 62: 计算确定需要进行信号发送的 VDSL线路的电气长度值;
首先, 可以得到线路的电气长度, 具体可以采用两种获取线路的电气长度的方法, 但并仅不限于这两种方法, 所述两种方法具体为:
第一种方法为:在 G. 994的握手阶段,根据 VTU-0或 VTU- R根据接收 TONES的信号强度, 可以预估线路的电气长度;
第二种方法为: 通过线路测试仪器, 得到预估线路的电气长度。
步骤 63: 判断所述的电气长度值是否超过所述预定门限值, 如果超过, 则执行步骤 64, 否则, 执行步骤 65;
步骤 64: 降低 VDSL线路上信号发送的频率, 具体可以关闭高频段信号的发送, 仅发 送低频段信号, 以降低高频串扰;
在信道发现阶段幵始时, 可以根据预估线路的电气长度, 和一个网管可配置或固定 的电气长度门限值比较, 例如所述的门限值可以为 1. 1公里, 当所述电气长度大于或等 于门限值长度时, 高频段 DS2已经无法用于进行数据传输, 因此, 在 0-P- Channel-Discovery和以后的相关下行信号, 关闭串扰较大的 DS2频段的发射, 这样 将有效减少线路的串扰;
同样原理, 该步骤也可应用于上行信号的处理: 在信道发现开始时, 可以根据预估 线路的电气长度, 和一个网管可配置或固定的门限 (例如 1公里) 比较, 当长度大于或 等于预定的门限值长度时, US2 (上行频道) 已经没有用处, 在 R-P- Channel- Discovery (远端信道发现信号) 和以后的相关上行信号, 关闭串扰较大的 US2频段的发射, 这样 将有效减少线路的串扰。
步骤 65: 进行正常的信号发送处理;
例如, 可以仅对信号进行功率削减处理后发送, 具体的处理方法可以包括:
( 1 ) 对于下行信号的处理: 当长度小于门限长度时, 现有的 DPB0 (下行功率降低) 可以起有效作用, 发射的功率将低于额定功率, 线路串扰也会相对降低。
(2) 对于上行信号的处理: 当长度小于门限长库时, 现有的 UPB0 (上行功率降低) 可以起有效作用, 发射的功率将低于额定功率, 线路串扰也会相对降低。
本发明中, 当以接收子载波信号强度、 频率响应和背景噪声中的至少一项, 和 /或, 根据接收子载波信号强度和 /或频率响应和 /或背景噪声计算获得的参数作为所述的线 路参数时, 相应的处理过程与步骤 61至步骤 65所述的处理过程类似, 主要为当相应的线 路的参数不符合相应的门限值要求(如大于相应门限值) , 则对线路中的信号发送功率 进行调整, 以降低线路中的高频串扰, 具体实现方案可以参照图 6所示, 在此不再详述。
另外, 前面仅以在 VDSL线路的信号发现阶段实现本发明为例进行说明, 除此之外, 本发明还可以应用于 VDSL线路的训练阶段和 /或信道分析阶段等。
本发明还可以设置各线路电气长度对应的不同的额定功率上限, 并根据设置的功率 上限控制信号发送功率, 从而控制线路的串扰。
本发明在降低其他 DSL线路串扰过程中, 相应的处理方式与降低 VDSL高频串扰的实 现过程类似, 故在此不一一详述。
本发明还提供了一种降低数字用户线之间串扰的装置,所述的装置设置于线路的局 端单元和 /或远端单元中。
所述装置的结构如图 7所示, 具体包括以下组成模块:
线路参数计算模块: 用于计算并确定线路的电气长度等参数, 具体可以采用根据接 收的子载波信号强度计算线路的参数, 也可以通过线路测试仪器预测线路的参数; 发送信号处理模块: 根据计算确定的线路的参数值确定发送的信号的频率范围, 并 发送相应频率的信号, 主要原则是, 当参数超过预定值时, 则关闭高频段信号的发送, 仅发送低频段信号;
信号处理触发模块: 用于在线路的信道发现阶段、 训练阶段和 /或信道分析阶段触 发所述的发送信号处理模块,以调整相应阶段下的信号发送的频率,减少线路中的串扰。 综上所述, 本发明可以有效降低线路信道发现阶段上下行信号对相邻线路的串扰。 同时, 本发明实现为基于现有标准, 因此具有简单易行的优点。
以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围并不局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易想到的变化或替 换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围应该以权利要求的保 护范围为准。

Claims

权利要求
1、 一种降低数字用户线之间串扰的方法, 该方法涉及局端装置, 用户端装置以及 连接局端装置和用户端装置的线路, 其特征在于, 所述的方法包括:
根据握手信号获取所述线路的参数;
根据获得的线路参数确定线路可用频率, 并根据可用频率确定发送信号功率或功率 並^ ρέρ ·
!^曰 τ¾ /又;
基于确定的发送信号功率或功率谱密度利用可用频率进行信号的发送。
2、 根据权利要求 1所述的方法, 其特征在于, 所述的线路参数为接收子载波信号强 度、 和 /或频率响应、 和 /或背景噪声, 和 /或根据接收子载波信号强度和 /或频率响应和 /或背景噪声计算获得的参数。
3、 根据权利要求 1所述的方法, 其特征在于, 所述的握手信号为 G. 994. 1中的握手 信号。
4、 根据权利要求 1所述的方法, 其特征在于, 当所述线路的参数为电气长度值时, 所述的获取所述线路的参数的处理包括:
在握手阶段, 根据接收的子载波信号强度计算线路的电气长度值;
或者, .
通过线路测试仪器测试获得线路的电气长度值。
5、 根据权利要求 1所述的方法, 其特征在于, 所述的确定可用频率的处理包括: 根据所述的电气长度值确定在信道发现阶段、 训练阶段和 /或信道分析阶段在相应 线路上发送的信号的频率范围。
6、 根据权利要求 1至 5任一项所述的方法, 其特征在于, 所述的方法还包括: 当所 述的电气长度值超过预定的门限值时, 则降低该线路上发送的上行信号和 /或下行信号 的频率。
7、 根据权利要求 6所述的方法, 其特征在于, 所述的降低该线路的发送的信号的频 率包括: 关闭该线路上的高频段信号的发射, 仅发送低频段信号。
8、 根据权利要求 6所述的方法, 其特征在于, 所述的门限值为固定设置或可修改更 新的门限值。
9、 一种降低数字用户线之间串扰的方法, 其特征在于, 所述的方法包括: 确定线路的参数,并根据所述的参数值及其对应的发送功率上限值确定该线路上发 送的信号的发射功率。
10、 一种降低数字用户线之间串扰的方法, 该方法涉及局端装置, 用户端装置以及 连接局端装置和用户端装置的线路, 其特征在于, 所述的方法包括- 根据握手信号获取所述线路的参数; '
根据获得的线路参数确定线路不可用频率, 并降低不可用频率以外的信号的功率或 功率谱密度。
11、 一种降低数字用户线之间串扰的装置, 其特征在于, 包括:
线路参数计算模块: 用于计算并确定线路的参数;
发送信号处理模块: 根据计算确定的线路的参数值确定发送的信号的频率范围, 并 发送相应频率的信号。
12、 根据权利要求 11所述的降低数字用户线之间串扰的装置, 其特征在于, 所述的 装置还包括:
信号处理触发模块: 用于在线路的握手阶段、 信道发现阶段、 训练阶段和 /或信道 分析阶段触发所述的发送信号处理模块。
13、 根据权利要求 11或 12所述的降低数字用户线之间串扰的装置, 其特征在于, 所述的装置设置于线路的局端单元和 /或远端单元中。
PCT/CN2006/002598 2005-09-30 2006-09-30 Procede et appareil d'affaiblissement diaphonique sur des lignes d'abonnes numeriques WO2007036165A1 (fr)

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