CN100563290C - Method and apparatus for automatically selecting operation mode in XDSL network - Google Patents

Method and apparatus for automatically selecting operation mode in XDSL network Download PDF

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CN100563290C
CN100563290C CN 200510106694 CN200510106694A CN100563290C CN 100563290 C CN100563290 C CN 100563290C CN 200510106694 CN200510106694 CN 200510106694 CN 200510106694 A CN200510106694 A CN 200510106694A CN 100563290 C CN100563290 C CN 100563290C
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band
signal
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CN1863259A (en )
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军 周
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华为技术有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • H04L27/2608Allocation of payload
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M11/00Telephonic communication systems adapted for combination with other electrical systems
    • H04M11/06Simultaneous speech and telegraphic or other data transmission over the same conductors
    • H04M11/062Simultaneous speech and telegraphic or other data transmission over the same conductors using different frequency bands for speech and other data

Abstract

本发明涉及一种XDSL网络中自动选择运行模式的实现方法及系统。 The present invention relates to an XDSL network selection method and system for automatic operation mode. 本发明主要包括:首先,由局端单元向用户端单元发送多模式下的一组子载波信号,之后,根据用户端单元接收的子载波信号计算各子载波能够承载的比特数,并根据所述比特数确定各模式的能够承载的比特数;最后,根据所述的各模式的能够承载的比特数确定选择的模式。 The present invention includes: First, send a set of subcarrier signals in the multimode terminal unit by the user to the central office unit, then, the number of bits can be carried in accordance with sub-carrier signals is calculated for each sub-carrier received by the user terminal unit, and in accordance with the said bit number determining the number of bits can be carried by each mode; and finally, determining the number of bits according to the selected mode according to each mode can be carried. 本发明能够根据线路实际条件,实现运行模式的自动选择,并且只要进行一次训练能选择最好的运行模式。 The present invention can be based on the actual conditions of the line, automatically select the operation mode, and as long as a training can choose the best mode of operation. 因此,本发明提供了一种不增加握手时间和复杂程度,并且可以提高选用模式的准确度。 Accordingly, the present invention provides a handshaking time and without increasing the complexity, and may improve the accuracy selection mode.

Description

XDSL网络中自动选择运行模式的实现方法及装置 XDSL network implemented method and apparatus for automatically selecting the operating mode

技术领域 FIELD

本发明涉及网络通信技术领域,尤其涉及一种XDSL网络中自动选择运行模式的实现方法及装置。 The present invention relates to network communication technology, and particularly relates to a method and a device to realize XDSL network operating mode is automatically selected.

背景技术 Background technique

随着xDSL (各种数字用户线)技术的不断发展,目前已经产生了一系列与xDSL技术相关的技术标准。 With the development of xDSL (various Digital Subscriber Line) technology, it has produced a series of xDSL technology-related technical standards. 其中,ITU-T的标准簇具体包括:ADSL (非对称数字用户线)(G.992.1/2 ) 、 ADSL2 (第二代不对称数字用户线) (G.992.3) 、 ADSL2+ (下行带宽扩展的第二代不对称数字用户线) (G.992.5 ) , SHDSL ( G.991.2 ) 、 VDSL (甚高速数字用户线) (G.993.1 ) 、 VDSL2 (第二代甚高速数字用户线)等标准。 Wherein, ITU-T standard cluster comprises: ADSL (Asymmetric Digital Subscriber Line) (G.992.1 / 2), ADSL2 (second generation Asymmetric Digital Subscriber Line) (G.992.3), ADSL2 + (downlink bandwidth extension The second generation asymmetric digital Subscriber line) (G.992.5), SHDSL (G.991.2), VDSL (very High Speed ​​digital Subscriber line) (G.993.1), VDSL2 (very High Speed ​​second generation digital Subscriber line) standards. 而且,每一个标准还定义了一些附录用于满足不同的业务或者区域需求,比较突出的是ADSL2 annex L (扩展传输距离的ADSL2),还可以称为READSL2。 Further, each standard defines appendices to meet different service requirements or the region, the more prominent is ADSL2 annex L (distance transmission ADSL2), it may also be referred READSL2.

为了应用方便,ADSL2+系统需要同时兼容ADSL2以及READSL2。 In order to facilitate the application, ADSL2 + ADSL2 systems need to be compatible and READSL2. VDSL2将会支持VDSL2、 VDSL1, ADSL2+、 ADSL2以及READSL2。 VDSL2 will support VDSL2, VDSL1, ADSL2 +, ADSL2 and READSL2.

同时,为了满足频谱管理的要求,下行总输出功率必须保证不超过19.8dBm,因此,在所用频带内,annex L的PSD mask (功率谱密度掩码) 高于ADSL2 annex A的PSD mask, ADSL2 annex A的PSD mask高于ADSL2+ annex A的PSD。 Meanwhile, in order to meet the requirements of spectrum management, the total downlink output power must ensure that no more than 19.8 dBm, therefore, within the frequency band used, annex L of the PSD mask (power spectral density mask) is higher than the PSD mask ADSL2 annex A, ADSL2 annex PSD mask a is higher than the ADSL2 + annex a of the PSD.

然而,随着线路距离的增加,高频部分逐渐不能使用,此时如果切换到频带较窄的模式下运行,由于频率较窄的模式PSD mask更高,因而能够获得比较高的速率。 However, with increasing distance from the line, high frequency part gradually can not be used at this time if the operation is switched to the narrow band mode, since the higher frequency narrow PSD mask pattern, it is possible to obtain a relatively high rate. 类似情况在VDSL2中也存在,当距离增加到DS1 (信号速率和格式1 )逐渐退化到ADSL2+时,如果能切换到八031_2+ annex A的频谱,其速率将超过一直使用DS1的PSD mask的速率。 A similar situation exists in VDSL2, when the distance increases DS1 (signal rate and format 1) is gradually degraded to the ADSL2 +, if they can switch to eight 031_2 + spectrum annex A, the rate over always use rate PSD mask of the DS1.

在xDSL网络中,为了在众多的标准运行模式中选择一种,ITU-T还定义了相应的握手协议G.hs,用于xTU-C (xDSL局端单元)和xTU-R ( xDSL用户端单元)之间协商运行模式以及传递配置参数,以便于xDSL网络中选择应用相应的运刊"漠式。 In the xDSL network, to select one of the many standard operating mode, ITU-T also defines corresponding G.hs handshake protocol, for the xTU-C (xDSL central office unit) and xTU-R (xDSL UE negotiation between the cells) and a transfer operation mode configuration parameter, select an application to transport journal "in desert formula xDSL network.

尽管如此,由于可选模式太多,G.hs协议运行的状态机也是十分复杂、 费时。 Nevertheless, too many selectable modes, G.hs protocol state machine operation is very complex and time-consuming. 很多时候xTU-C和xTU-R都会支持一种multi-mode (复合模式)的模式,也就是可以同时支持八051_2+ annex A、 ADSL2 annex A、 ADSL2 annex L、 ADSL annex A、 G.lite annex A,或者同时支持VDSL2、 VDSL、 ADSL2+ a匿x A、 ADSL2 annex A、 ADSL2 annex L ADSL annex A、 G.lite annex A,这时,局端和用户端双方便需要根据一定的规则自动选择一种最佳的运行模式。 Many times xTU-C and xTU-R will support one kind of mode multi-mode (multi mode), i.e., it can support eight simultaneous 051_2 + annex A, ADSL2 annex A, ADSL2 annex L, ADSL annex A, G.lite annex A or support VDSL2, VDSL, ADSL2 + a hide x a, ADSL2 annex a, ADSL2 annex L ADSL annex a, G.lite annex a, this time, both the central office and would require the UE automatically selected according to certain rules best mode of operation.

目前,在ITU-T标准中提出了一种Automode (自动模式)技术。 Currently proposed a Automode as (automatic mode) technology in ITU-T standard. 由于ITU-T目前已经达成一致的是Automode的选择依据是所选择的运行模式是使上行和下行速率之和最大,因此,通过计算SNR (信噪比)便是一个很容易想到的方法,具体的实现方式为:根据握手过程中的Medley (—种由二进制伪随即序列以4-QAM (正交幅度相位调制)调制到所有使用的子载波得到的信号)环节可以得到的每个子载波的信噪比SNR组成的表,ATU-R (ADSL 用户端单元)和ATU-C (ADSL局端单元)会交换此表,ATU-C用这个表分别计算各种模式上下行的可能速率,然后,根据这个结果选择符合上述要求的运行模式,并重新启动训练,此时ATU-C给出的运行模式便是上一次训练得到的模式。 Since the ITU-T is currently agreed Automode is selected depending on the selected operational mode is a mode of uplink and downlink and the maximum rate, therefore, a method by calculating SNR (signal to noise ratio) is a readily occur, particularly implementation is: according to the handshake Medley (- a kind of pseudo-binary sequences then 4-QAM (quadrature amplitude phase modulation) modulated onto all sub-carriers using the obtained signal) of each sub-carrier part of a letter can be obtained noise ratio (SNR) of the composition table, ATU-R (ADSL end user unit) and ATU-C (ADSL central office unit) will be exchanged table, ATU-C may calculate uplink and downlink rates for the various modes of use of this table, respectively, and then, this results select the operating mode according to meeting the above requirements, and re-start training, this time operation mode ATU-C is given on a training mode to get.

这种需要经过二次训练得到的运行模式虽然能够最大限度的接近标准的要求,但是由于要进行二次训练,训练的时间长,很有可能超过标准要求的时间上限,而且实现过程比较复杂。 This training needs to go through a secondary mode of operation even though it can get the maximum close to the standard requirements, but due to the secondary training, training for a long time, probably longer than the upper limit of the standard requirements and the implementation process more complicated. 目前采用的另一种Automode的实现方法是根据握手时xTU-R发过来的握手信号的衰减判断线路的长度,具体为通过信号幅度来估计衰减,然后基于线路长度,并根据经验参数来选择相应的运行模式。 Another Automode present implementation method used is based on the length of the line attenuation is determined when the handshake xTU-R sent over handshake signal, specifically attenuated by the signal magnitude estimates, and based on the line length, and selects the appropriate parameter based on experience mode of operation. 比如2.8km以内用ADSL2+ annex A, 2.8km ~ 3.8km之间用ADSL2 ,超过3.8km用ADSL2 3nnex 1_。 For example within 2.8km + annex A with ADSL2, 2.8km ~ 3.8km between with ADSL2, with more than 3.8km ADSL2 3nnex 1_.

该方法虽然简单且不需要增加握手过程的时间。 The method is simple and does not require increasing the handshake process. 但是这种方法基于上行握手信号来推断线路长度,并根据经验来选择的方法过于粗糙,主要是上行信号的衰减并不能可靠的表达下行方向的衰减进而推断容量,导致经常会出现Automode所选用的模式的速率反而比较低的现象,具体如图1所示,图1中显示,当采用该方法进行模式选择切换处理时,在切换点将导致速率跳变较大,影响传输性能。 However, this method is based on the uplink a handshake signal to infer the length of the line, and in accordance with the method chosen empirically too rough, the main uplink signal attenuation is not a reliable expression of the attenuation in the downlink direction and then infer the capacity, often occur resulting in the selected Automode but a relatively low rate mode phenomenon, particularly shown in FIG. 1, shown in figure 1, when using the mode selection method switching process, the switching point will result in a greater rate transition, affect the transmission performance.

发明内容 SUMMARY

本发明的目的是提供一种XDSL网络中自动选择运行模式的实现方法及装置,从而可以根据XDSL网络的当前状况自动地选择一种运行模式进行工作, 并可以保证获得最高的传输速率。 Object of the present invention to provide a method and apparatus for realization XDSL network operating mode is automatically selected, thereby automatically select one mode based on the current status of the work XDSL network, and can ensure the highest transmission rate.

本发明的目的是通过以下技术方案实现的: Object of the present invention is achieved by the following technical solution:

本发明提供了一种XDSL网络中自动选择运行模式的实现方法,包括: The present invention provides an XDSL network automatically selecting the operating mode implemented method, comprising:

A、 局端单元向用户端单元发送多模式下的一组子载波信号; A, central office end unit to the user unit transmits a set of subcarrier signals in the multimode;

B、 根据用户端单元接收的子载波信号计算各子载波的信噪比,并根据所述信噪比确定各模式的能够承载的比特数; B, is calculated according to the SNR of each subcarrier subcarrier signal unit received by the UE, and determines the number of bits can be carried in each mode according to the signal to noise ratio;

C、 在XDSL网络中根据所述的各模式的能够承载的比特数确定选择的模式,包括:C1、计算窄频带模式下带内部分的比特数较相邻的宽频带模式下与窄频带带内相同的子载波集合的比特数之差作为带内增量还计算窄频带模式带外但是属于宽频带模式带内的部分在宽频带模式下的比特数作为带外增量;C2、当所述带内增量大于带外增量时,则选择窄频带模式,否则,选择宽频带模式。 C, determining the number of bits in accordance with the selected mode of each mode can be carried in the XDSL network, comprising: C1, calculating the number of bits of the band portion adjacent relatively narrow band mode of the wide band mode and the narrow-band band the difference between the number of bits in the same set of subcarriers within a narrow frequency band also calculates an incremental mode but with the outer portion of the inner part of the wide band mode with the number of bits in a band wide band mode increment; C2, when the when delta is greater than said inner band with an incremental, narrow band mode is selected, otherwise, selecting a wide band mode.

所述的步骤A包括: Said step A comprising:

局端单元向用户端单元发送所有频段包含的子载波信号,或者,发送窄频段模式下的最高频率以上频段包含的所有子载波信号,或者发送梳状子载波信号。 Central office unit sent to the user terminal unit band signals comprises all sub-carriers, or all sub-carrier signals transmitted at the highest frequency narrow band mode comprises the bands above or comb shaped sub-carrier signal transmission.

所述的步骤A还包括: Said step A further comprises:

当发送所有频段或窄频段模式下的最高频率以上频段包含的所有子载波信号时,局端单元需要根据收到的用户端单元发出的信号幅度进行发送功率值的削减,或直接将发送功率削减一个固定功率值后,发送削减后的功率值的子载波信号到用户端单元。 When all the subcarrier signals in the highest frequency band or narrow band transmission modes of all bands above included, the central office unit is required to cut the transmission power value according to the amplitude of the signal received by the client unit sent, directly or transmit power reduction after a fixed power value, the power value of the sub-carrier signals after the UE transmits to the reduction unit.

所述子载波信号是周期性间隔发送。 The sub-carrier signal is transmitted at periodic intervals.

所述的步骤B包括: Said step B comprising:

B1、计算各子载波的信号功率值及各子载波对应的背景噪声功率值; B2、根据所述的信号功率值和背景噪声功率值计算各子载波的信噪比; B3、根据各子载波的信噪比计算各模式下能够承载的比特数。 B1, calculates the signal power value of each subcarrier and each subcarrier corresponding to a background noise power value; B2, calculating the SNR of each subcarrier based on the signal power value and the power value of the background noise; B3, each subcarrier in accordance with SNR calculating the number of bits can be carried in each mode. 所述的步骤B1包括: Said step B1 comprises:

用户端单元接收局端单元发送的子载波,并计算信号功率值,当局端单元停止发送子载波时,则计算该子载波对应的背景噪声功率值。 When the user receives the central office end unit cells transmitted subcarriers, calculate signal power value, the authorities end unit stops sending the subcarriers, the subcarriers corresponding to the background noise power value is calculated. 本发明中所述的各个子载波能够承载的比特数M(/)为: According to the present invention, each subcarrier carries a number of bits M (/) is:

<formula>formula see original document page 9</formula>薦w聘io <Formula> formula see original document page 9 </ formula> w recommended employed io

比,训W,为Ti4"定义的SNR gap,大小为9.75dB, TARSNRM为预定的 Ratio, training W, is the SNR gap Ti4 "definition, the size of 9.75dB, TARSNRM predetermined

目标噪声容限。 Target noise margin.

所述的步骤B包括: Said step B comprising:

在用户端单元上,根据接收的子载波信号计算各子载波信噪比,并根据所述信噪比确定各模式下能够承载的比特数; 或者, On the client unit, is calculated according to sub-carrier signals received by each sub-carrier signal to noise ratio, and determines the number of bits can be carried in each mode according to the signal to noise ratio; or

由用户端单元将测量获得的信息发送给局端单元,由局端单元根据所述的信息计算各子载波信噪比,并根据所述信噪比确定各模式下能够承载的比特数。 Information from the user terminal obtained by the measurement unit to a central office unit, the central office unit calculated by the SNR of each subcarrier according to the information, the signal to noise ratio and determines the number of bits can be carried in each mode in accordance with.

所述的步骤C还包括: Said step C further comprises:

C3、当可选择模式多于2种时,若在宽频带模式和窄频带模式中根据比较带内比特增量和带外比特增量,选择将当前的窄频带模式作为宽频带模式,则以与其相邻的比其频带范围窄的模式作为窄频带模式,重新进行C1和C2; C3, when more than two kinds of selectable modes, when a wide band mode and the narrow-band mode according to the comparison with the inner and outer band bit increments bit increment, the current selection mode as the narrow-band wideband mode, they are adjacent thereto which is narrower than the frequency range of the model as a narrow band mode, re-C1 and C2;

或,当选择当前的宽频带模式,则将该宽频带模式设为新的窄频带模式,将与其相邻的比其频带范围更宽的模式作为宽频带模式,重新进行C1和C2。 Or, when selecting the current wideband mode, the wideband mode is set to the new narrow band mode, the adjacent frequency range which is wider than the wide band mode as the mode re-C1 and C2.

所述的各模式包括: Said each mode includes:

下行带宽扩展的第二代不对称数字用户线ADSL2+annex A三种模式,和/ 或第二代不对称数字用户线ADSL2 annex A,和/或距离扩展的第二代不对称数字用户线READSL2,和/或第二代甚高速数字用户线VDSL2(G.993.2)。 Downlink bandwidth extension Asymmetric Digital Subscriber Line second generation ADSL2 + annex A three modes, and / or Asymmetric Digital Subscriber Line second generation ADSL2 annex A, and / or from the second generation extended Asymmetric Digital Subscriber Line READSL2 , and / or the second generation of very high-speed digital Subscriber line VDSL2 (G.993.2).

所述的方法还包括: The method further comprising:

D、在DSL收发器训练完成时,执行步骤A至步骤C,当确定相应的运行模式后,更改当前的运行模式。 D, DSL transceivers when the training is completed, step A to step C, and when the corresponding operating mode is determined, change the current operating mode. 所述的步骤D包括: Said step D comprising:

如果是用所有载波叠加的信号C-Reverb信号计算SNR,则在调制了4-QAM信号C-medley开始更换运行模式以及对应的频谱; If the SNR is calculated using all the C-Reverb signal carrier signal superimposed on the 4-QAM modulated signal C-medley starting replacement mode of operation and the corresponding spectrum;

如果是用C-Medley信号计算SNR,则在后面通过比特和增益表bit&gain table来调整功率谦到对应的模式,相应的运行模式信息在用户端设备的消息R-MSG2中传递。 If the C-Medley signal is calculated SNR, then later adjusting the power mode corresponding to Qian bits and gains table bit & gain table, the corresponding operating mode information message transfer R-MSG2 CPE's.

本发明还提供了一种XDSL网络中自动选择运行模式的装置,包括: 承载能力计算模块:根据用户端单元接收的子载波信号计算各子载波的信噪比,并根据所述信噪比计算各模式下的能够承载的比特数信息; The present invention also provides an apparatus for automatically selecting XDSL network operation mode, comprising: carrying capacity calculation module: calculated for each sub-carrier signal of the UE according to the sub-carrier unit receives SNR, and SNR is calculated according to the the number of bits of information can be carried in each mode;

模式选择模块:根据承载能力计算模块计算确定的各模式下的能够承载的比特数选择局端单元与用户端单元间的运行模式,包括:计算窄频带模式下带内部分的比特数较相邻的宽频带模式下与窄频带带内相同的子载波集合的比特数之差作为带内增量,还计算窄频带模式带外但是属于宽频带模式带内的部分在宽频带模式下的比特数作为带外增量;当所述带内增量大于带外增量时,则选择窄频带模式,否则,选择宽频带模式。 Mode selection module: the number of bits is calculated at each calculation module determines the mode selection of the operating mode can be carried between the user unit and the central office end unit, comprising a carrying capacity: calculating the number of bits of the band portion adjacent relatively narrow band mode the difference between the number of bits in the same sub-carrier within a narrow frequency band as in-band set increments, further calculates the narrow band mode band wideband mode but the number of bits belonging to a wideband mode portion of the inner band in a wide band mode as the band increment; when delta is greater than the in-band band increments, the narrow band mode is selected, otherwise, selecting a wide band mode.

本发明还提供了一种XDSL网络中自动选择运行模式的系统,包括用户端单元和局端单元,包括所述的XDSL网络中自动选择运行模式的装置,而且还包括: The present invention further provides a XDSL network automatically selecting the operating mode of the system, comprising a client unit and a central office unit, said apparatus comprising XDSL network automatically selecting the operating mode, and further comprising:

设置于局端单元中的子载波发送模块,用于根据预定的条件进行子载波的发送处理; Means disposed in the central office subcarrier transmission module for processing transmission subcarriers based on a predetermined condition;

设置于用户端单元中的测量模块,用于测量子载波的信号功率和对应的背景噪声功率,并提供给所述的承载能力计算模块。 Carrying capacity is provided at the client unit measurement module for the power signal and the background noise power measurement corresponding subcarrier, and supplies the calculation module.

所述的自动选择运行模式的装置设置于用户端单元或局端单元上,或者,独立于用户端单元和局端单元设置。 Means arranged to automatically select the mode of operation of the client unit or at the central office unit, or independent of the user unit and the central office terminal unit is disposed.

由上述本发明提供的技术方案可以看出,本发明能够根据线路实际条件,实现automode的运行模式选择,并且只要进行一次训练便可以选择最好的运行模式。 Provided by the technical solution of the present invention can be seen that the present invention can be based on the actual conditions of the line, the operation mode selection automode achieved, and as long as a training can choose the best mode of operation. 同时,本发明还可以扩展到VDSL2兼容ADSL2+ annex A、 ADSL2 annex A、 ADSL2 annex L的情况,也可以实现ADSL2十annex B和ADSL2 annex B的自动选择。 Meanwhile, the present invention can be extended to be compatible VDSL2 ADSL2 + annex A, ADSL2 annex A, ADSL2 annex L case, automatic selection can be realized and ADSL2 ADSL2 ten annex B of annex B.

因此,本发明提供了一种不增加握手时间和复杂程度,并且可以提高选用的模式为速率最大化的模式的准确程度。 Accordingly, the present invention provides a handshaking time and without increasing the complexity, and can improve the accuracy of the selected mode is a mode maximizing the rate.

附图说明 BRIEF DESCRIPTION

图1为现有技术中线路衰减过程示意图; Figure 1 is a prior art schematic process line attenuation;

图2为各种运行模式下的下行频带使用情况示意图; Figure 2 is a schematic diagram of a downlink frequency band usage in various operating modes;

图3为本发明所述的方法的流程图;图4为本发明中线路衰减过程示意图; Flowchart of a method according to the present invention. FIG. 3; FIG. 4 of the present invention, a schematic process line attenuation;

图5为本发明所述的系统的结构示意图。 FIG 5 is a schematic structural diagram of the system of the invention.

具体实施方式 detailed description

如图2所示,图2中横坐标为频率值,纵坐标为功率谱密度值(DB),各种可以选择的模式下的带内频谱分别为: 2, the abscissa in FIG. 2 into a frequency value, and the ordinate is the power spectral density (DB), in-band spectrum in a variety of modes that can be selected are:

ADSL2+ Annex A模式的上行频带为25.875〜138KHz, tone数为6〜 31,下行频带为:138KHz〜2208KHz, tone为从32至511; ADSL2 + Annex A uplink frequency band mode is 25.875~138KHz, tone number of 6 ~ 31, the downlink frequency band is: 138KHz~2208KHz, tone from 32 to 511;

ADSL2 Annex厶模式的上行频带与八031_2+ Annex A相同,下行频带为:138KHz to1104KHz, tone为从32至255; ADSL2 Annex Si uplink frequency band and mode same eight 031_2 + Annex A, a downlink frequency bands: 138KHz to1104KHz, tone from 32 to 255;

ADSL Annex L模式的上行频带(wideband,宽频带)为25.875 ~ 103.5KHz, tone数为6〜23,下行频带为:138KHZ to 552KHz, tone为从32 至127。 Uplink frequency band ADSL Annex L mode (Wideband, wideband) of 25.875 ~ 103.5KHz, the number of 6~23 tone, downlink frequency band is: 138KHZ to 552KHz, tone from 32 to 127.

本发明的核心是根据各种模式(三种模式)的带内频谱区别导致的比特承载的区别,通过比较带内bit增量和带外bit增量来选择运行模式,从而选择一种可以保证获得最高的传输速率的运行模式。 The core of the present invention is the difference between the difference spectrum with the various modes (three modes) causes a bit carried to select the operating mode by comparing the band with bit and bit delta increment to select a way to ensure that obtain the operating mode of the highest transfer rates. 本发明中进行的选择可以在CPE做(CPE根据计算结果直接选择运行模式),也可以由CPE将信息包给局端,由局端来选"t奪。 The selection may be made according to the present invention (CPE directly select the operating mode based on the calculation result) may be by the CPE CPE packet to the central office, the central office to the election "t wins.

具体为计算窄频带模式下带内部分的比特数较相邻的宽频带模式下与窄 DETAILED the wideband mode to the narrow band mode with the calculated number of bits than the inner portion adjacent the narrow

频带带内相同的子载波集合的比特数之差作为带内增量,还计算窄频带模式带外但是属于宽频带模式带内的部分在宽频带模式下的比特数作为带外增量;当所述带内增量是否大于带外增量时,则选择窄频带模式,否则,继续判断直到完成模式选择,即将当前的窄频带模式作为宽频带模式,并以与其相邻的比其频带范围窄的模式作为窄频带模式,重新进行上述操作。 The difference between the number of bits the same as the set of subcarriers with incremental, further calculates the narrow band mode with the outer band portion of the inner band but belonging to the wideband mode with the number of bits in a band wide band mode increment; when if said band is greater than the incremental delta band, narrow band mode is selected, otherwise, continue until the mode selection is determined, i.e. the narrow band mode as the current mode of the wide band, and in which adjacent frequency range than narrow band mode as the narrow mode, the above operation again.

在本发明的实现过程中,具体是在握手阶段,通过发送全部子栽波或者梳状子载波,并根据各子载波的信噪比计算承载的比特数,然后,根据带内比特增量和带外比特增量的比较确定选择相应的运行模式。 In the implementation of the present invention, in particular in the handshake phase, or comb-shaped sub-carrier wave planted by sending all of the sub, and the number of bits carried by each sub-carrier signal to noise ratio is calculated, and then, in accordance with the band bit increments and Comparative outer bit increment determined select the appropriate operating mode.

所述的梳状子载波信号可以是ADSL2+的C-Comb信号的子集,而且,如果使用梳状子载波,则采用插值法计算两个梳齿之间的tone的比特承载。 The comb shaped sub-carrier signal may be a subset of ADSL2 + C-Comb signal, and, if the comb plaint carrier is calculated using the tone between two comb teeth carrier interpolation bits.

另外,需要说明的是,本发明中发送的全部子载波信号或梳状子载波信号为采用间隔发送的方法进行发送,发送信号时段用于CPE测量子载波信号功率,静默阶段CPE测量背景噪声功率,以计算信噪比值。 Further, it is noted that all the sub-carrier signals or comb-shaped sub-carrier signal transmitted in the present invention is a transmission method of the transmission interval, the transmission signal period for CPE subcarrier signal power measurement, measurement of the background noise muting stage CPE power, to calculate the SNR.

而且,本发明中,如果采用的是发送全部子载波或者是从tone 128开始的子载波,则需要做PCB (Power cut back,功率削减),但是,对于梳状子载波则不必进行PCB处理。 Further, in the present invention, if the transmit all subcarrier or tone 128 starting from the sub-carrier, needed to be done PCB (Power cut back, power reduction), however, it is not necessary for a comb-shaped sub-PCB-carrier process.

本发明所述的方法除了用于READSL2, ADSL2 annex A, ADSL2+ annex A三种模式间的选择外,还可以用于VDSL2支持READSL2, ADSL2 annex A, ADSL2+ annex A情况,即共有四种运行模式可以选择,这样从VDSL2 DS1到ADSL2+再到ADSL2 annex A,最后是READSL2之间,实现自动选择运行模式。 The method of the present invention except for READSL2, ADSL2 annex A, annex A choice between the three modes ADSL2 +, but can also be used to support VDSL2 READSL2, ADSL2 annex A, ADSL2 + annex A case in which a total of four operating modes selected, so that from then VDSL2 DS1 to ADSL2 + ADSL2 annex A, and finally between READSL2, automatically select the operating mode.

下面将结合附图对本发明所述的方法的具体实现方式进行说明。 In conjunction with the accompanying drawings will be described specific implementation of the method according to the present invention. 步骤31: ATU-C发送修改的C-Tones信号; Step 31: ATU-C transmits C-Tones signal is modified;

目前的G.hs的C-Tones阶段,ATU-C发送tones 40,56,64,为了获得更多的信息,本发明修改C-Tones信号,具体可以发送三种C-Tones信号: 其一是发送从tone 32~511的所有tones; 其二是发送从128到511的tones; G.hs current stage of the C-Tones, ATU-C transmits tones 40,56,64, in order to obtain more information, the present invention modifies the C-Tones signal, specifically C-Tones signal transmitted three kinds: one is All transmitted tones from tone 32 ~ 511; the other is transmitted tones from 128 to 511;

其三是发送ADLS2十annex A的channel discovery阶段的C-Comb信号, 也就是tone 35, 47, 59, 64, 71, 83, 95' 107, 119' 143, 179, 203, 227 and 251 以及所有251+kx24 ( k为整数,并且251 + kx 24<511 ),对于VDSL2,发送channel discovery信号; The third is sending ADLS2 ten annex A of the channel discovery phase C-Comb signal, i.e. tone 35, 47, 59, 64, 71, 83, 95 '107, 119' 143, 179, 203, 227 and 251 and all 251 + kx24 (k is an integer, and 251 + kx 24 <511), for VDSL2, a signal transmission channel discovery;

为了避免modem的接收器过载,如果使用所有tone或者是tone 128~tone512, CO (局端)需要根据收到的CPE发出的信号幅度进行功率削减,也可以固定一个削减值PCB,将发送功率降低PCB值以后再发送,而对于C-Comb (梳状)信号,则不需要功率削减,因为其功率本身只有8.9dBm。 In order to avoid overload of the receiver modem, or if all tone is tone 128 ~ tone512, CO (central office) is required power reduction based on signal amplitude received CPE emitted, a cut may be fixed value of the PCB, the transmission power is reduced PCB after retransmission values, and for C-comb (comb) signal, power reduction is not required, because the power itself is only 8.9dBm.

CO发送的这种修改的C-Tones信号还以一定的周期开关,比如发送16ms信号,接着静默16ms,然后循环往复。 Such modifications of the C-Tones signal CO is also transmitted to the switch a certain period, such as signal transmission 16ms, 16ms silence followed, then the cycle.

步骤32:在有信号时CPE估算每一个tone的信号功率Ps,在无信号时CPE估算每一个tone上的背景噪声功率Pn。 Step 32: when there is a tone signal of each CPE estimate signal power Ps, no signal CPE estimated background noise power Pn on each tone.

cpe根据收到ro脱(o的信号功率和和噪声功率,计算信噪比 The received cpe ro off (signal power and noise power, and o is calculated SNR

(信噪比&\^(0 =尸<0 —),然后根据ITU-T G.992.3给出的可达速率ATTNDR (ATTainable Net Data Rate)的计算公式: (SNR & \ ^ (0 = P <0 -), and then calculated according to the rate up ATTNDR (ATTainable Net Data Rate) ITU-T G.992.3 given by:

广A«C-1 「 , 、,、 Canton A «C-1", ,,,

x4kbit/s x4kbit / s

Z [log (i + io(皿(0-训啊-^廢服)/10 Z [log (i + io (dish (0- training ah - ^ waste clothing) / 10

得到计算各个tone能承载的bit数的公式: M(O = log2(l + 10(還(')„面層)/10) Each tone is calculated to obtain the number of bit can carry formula: M (O = log2 (l + 10 (further ( ') "surface layer) / 10)

M(/)为7b—0承载的比特数,^W邵)为7b脱(0的信噪比,^"g,为 M (/) is the number of bits carried 7b-0, ^ W Shao) 7b is off (0 SNR, ^ "g, as

T1.417定义的SNR gap,对于DMT调制,其大小为9.75dB, TARSNRM为预 SNR gap T1.417 defined, for DMT modulation, the size of 9.75dB, TARSNRM pre

先设定的目标噪声容限。 First set target noise margin.

对于发送梳状子载波信号的情况,由于只发送了部分tone,因此只能得到这些tone的比特承载数,而那些没有发送的tone,可以通过插值的方法计算其比特承载。 For the case of transmitting a comb-shaped sub-carrier signal, since only the transmitted tone part, it can only obtain the number of bits carrying tone, and tone while those not transmitted, which bits can be carried by means of interpolation calculation.

步骤33:判断ATU-C中是否支持自动模式,即是否支持本发明提供的方法,如果是,则执行步骤35,否则,执行步骤34;当然,如果在系统中仅实现本发明则无需该判断处理步骤; 步骤34:忽略各信息,执行普通的握手流程; Step 33: Determine ATU-C the support automatic mode, i.e., whether the method of the present invention to provide support, if yes, performing step 35, otherwise, perform step 34; Of course, if only implements the invention in the system do not need the determination process; step 34: ignore the respective information, performs a normal handshake process;

步骤35:判断Tone128-511的比特数是否小于96,如果是,则执行步骤36,否则,执行步骤37; Step 35: determining whether the number of bits less than 96 Tone128-511, if yes, step 36 is executed, otherwise, step 37;

步骤36:选择READSL2模式; Step 36: Select READSL2 mode;

步骤37:判断Tone256-511的比特数是否小于75,如果是,则执行步骤38,否则,执行步骤39; Step 37: determining whether the number of bits less than 75 Tone256-511, if yes, step 38 is executed, otherwise, step 39 is executed;

步骤38:选择ADSL2 annex A模式; 步骤39:选4奪ADSL2十annex A模式。 Step 38: Select the ADSL2 annex A pattern; Step 39: 4 selected from the group wins ADSL2 ten annex A mode.

上述过程中步骤35至步骤39是本发明实现的核心技术内容部分,下面将对步骤35至步骤39描述的处理过程的可行性进行分析说明。 In the above-described process step 35 to step 39 is the core part of the technical details of the present invention is implemented, the feasibility of the process will be below described step 35 to step 39 to analyze described.

由于根据I丁UT G.992.x标准要求以及频谱管理的要求,ADSL2/ADSL2+ 和READSL2的发送功率不应超过19.8dBm,另外,在标准中还规定采用flat cut back (平坦削减)的方案,因此,可以计算出,READSL2的带内(tone 32~127)功率谱密度比ADSL2对应的频段(tone32〜127 )高3dB ,而ADSL2的带内(tone 32~255 )功率谱密度比ADSL2+的对应频段(tone 32~255)高1dB,如图2所示。 Since the requested I butoxy UT G.992.x spectrum management requirements and standards, ADSL2 / ADSL2 + and the transmission power should not exceed READSL2 19.8 dBm, Further, the standard also provides for use of flat cut back (flat cut) protocol, Thus, it can be calculated, within READSL2 band (tone 32 ~ 127) than the power spectral density of the corresponding band ADSL2 (tone32~127) 3dB higher, while the inner band of ADSL2 (tone 32 ~ 255) than the power spectral density corresponding to ADSL2 + band (tone 32 ~ 255) high 1dB, as shown in FIG.

根据上述比特加载公式可知,多承载一个bit需要大约3dB的信噪比,对于READSL2对应的频带内能够较ADSL2多承载(127-32+1 ) x 3/3:96bit, 但是其模拟带宽相应减少。 Loading the bit seen from the equation, a bit multi-carrier SNR of about 3dB is required, the frequency band corresponding to the inner READSL2 can be (127-32 + 1) x 3/3 multi-carrier than ADSL2: 96bit, but the analog bandwidth corresponding reduction . 因此如果tone 128〜511能够承载的bit小于96,则意味着使用READSL2能获得更高的下行速率。 Therefore, if bit tone 128~511 can carry less than 96, it means that READSL2 downlink rate can be higher. 同样ADSL2对应的频带比ADSL2+能够多承载(255-32+1)x 1/3=74.6bit,因此如果tone 256~511能承载的bit数小于74,则意味着使用ADSL2比ADSL2+更高的速率。 Corresponding to the same frequency band than ADSL2 ADSL2 + can be multi-bearer (255-32 + 1) x 1/3 = 74.6bit, so if tone 256 ~ 511 can carry bit number smaller than 74, it means that ADSL2 ADSL2 + higher rate than .

上面给出的处理过程只是其中一种具体的实方式,考虑到在C-Tones 阶段,收发器还没有训练好(比如自动增益控制AGC需要经过训练才能确定),可能会影响到信噪比计算的准确度。 Process given above is only one particular embodiment of a solid, taking into account the C-Tones stage, no good transceiver training (such as automatic gain control AGC training to determine the need to go through), it may affect the calculation of SNR accuracy. 因此还可以在收发器训练完成的 Thus also done in the transceiver training

时段开始,比如C-Reverb1以后的C-reverb信号和C-medley信号等所有覆盖 All coverage period begins, such as after C-Reverb1 C-reverb signal and the signals C-medley

全部频带的信号都可以用来计算信噪比。 All the signal band can be used to calculate the signal to noise ratio.

考虑到已经错过了模式选择阶段,本发明引入训练过程中更改运行模式的机制,具体为: Taking into account already missed the mode selection phase, the present invention is introduced into the training process to change the mode of operation of the mechanism, in particular:

如果是用C-Reverb (使用(0, 0 )调制的所有载波叠加的信号)信号计算SNR在C-medley (调制了4-QAM (由一个伪随机序列发生器产生)所有载波叠加的信号)开始更换运行模式以及对应的频i普; If it is (the use of all carriers superposed signal (0, 0) of the modulation) with C-Reverb signal calculating SNR in C-medley (a modulation 4-QAM (generated by a pseudo-random sequence generator) all superimposed carrier signal) starting the replacement operation mode and the corresponding frequency P i;

如果是用C-Medley信号计算SNR,则在后面通过bit&gain table (比特和增益表)来调整功率语到对应的模式,相应的运行模式信息在R-MSG2 (用户端设备的消息2)中传递。 If we use C-Medley signal computing the SNR, in the back bit & gain table (bits and gains table) to adjust the power spectrum to a corresponding mode, the corresponding operating mode information is transmitted in the R-MSG2 (message of the client device 2) .

为了选择合适的第一次训练模式,可以根据R-Tone-REQ (激活请求信号)信号粗略判断来选择,然后在根据上面的方案进行精确计算。 In order to select a suitable first training mode, according to R-Tone-REQ (activation request signal) to select a coarse determination, then accurate calculation according to the above embodiment.

本发明还提供了一种XDSL网络中自动选择运行模式的系统,如图5所示,其结构包括XDSL网络中自动选择运行模式的装置,所述的装置设置于用户端单元或局端单元上,或者独立于用户端单元和局端单元设备,图5中仅以其设置于用户端单元上为例绘制,当所述装置设置于局端单元上时,则需要由用户端单元将相应的测量信息发送给局端单元中的装置进行处理; The present invention further provides a XDSL network system automatically selecting the operating mode, shown in Figure 5, which means XDSL network structure comprising an automatic operating mode selected, said means disposed on the end unit or the central office to the user unit or independent of the user terminal equipment unit and the central office unit, FIG. 5 only provided in Example rendering on the client unit, when the device is disposed on the central office unit, the user is required by the respective end unit It transmits the measurement information to the processing unit, the central office apparatus;

所述的系统中还包括设置于局端单元中的子载波发送模块,用于根据预定的条件(即前面步骤31所述的三种子载波信号发送方式)进行子载波的发送处理,同时,还包括设置于用户端单元中的测量模块,用于测量子载波的信号功率和对应的背景噪声功率,并提供给XDSL网络中自动选择运行模式 The system further includes a central office unit subcarrier transmission means for transmitting subcarrier processing according to a predetermined condition (i.e., the step preceding the three sub-carrier signal transmission mode according to 31), while also It includes a user side unit measurement module for the power signal and the background noise power measurement corresponding subcarriers, and provide XDSL network to automatically select the operating mode

的装置中的承载能力计算模块。 Apparatus carrying capacity calculation module.

本发明所述的系统中的XDSL网络中自动选择运行模式的装置,如图5所示,包括承载能力计算模块和模式选择模块,分别为: Operating mode means XDSL network system automatically selected according to the present invention, shown in Figure 5, comprises a bearing capacity calculation module and a mode selection module, respectively:

承载能力计算模块,用于根据用户端单元测量的信息计算各模式下的能够承载的比特数信息; Carrying capacity calculating module, for calculating the number of bits of information in each mode can be carried by the UE according to the information measuring unit;

模式选择模块,根据承载能力计算模块计算确定的各模式下的能够承栽的比特数选择局端单元与用户端单元间的运行模式。 Mode selection module, calculates the number of bits capable of supporting planted in each mode calculation module determines the operating mode selection unit between the central office and the client unit according to the bearing capacity.

通过仿真结果表明,这种方案能够获得比较好的结果,具体参见图4所示,在图4中可以看出,采用本发明的切换方法,切换点的速率跳变很小。 Simulation results show that this scheme can obtain better results, specifically to Figure 4, it can be seen in FIG 4, using the handover method of the present invention, the hopping rate switching point is small.

综上,本发明能够根据线路实际条件,实现运行模式的自动选择,并且只要进行一次训练能选择最好的运行模式。 In summary, the present invention can be based on the actual conditions of the line, automatically select the operation mode, and as long as a training can choose the best mode of operation. 同时,本发明还可以扩展到 Meanwhile, the present invention can be extended to

VDSL2兼容ADSL2十annex A、 ADSL2 annex A、 ADSL2 annex L的情况, 也可以实现ADSL2十annex B和ADSL2 annex B的自动选择。 VDSL2 compatible ADSL2 ten annex A, ADSL2 annex A, ADSL2 annex L of the case, automatic selection can be realized and ADSL2 ADSL2 ten annex B of annex B.

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。 Above, the present invention is merely preferred specific embodiments, but the scope of the present invention is not limited thereto, any skilled in the art in the art within the scope of the invention disclosed can be easily thought of the changes or Alternatively, it shall fall within the protection scope of the present invention. 因此,本发明的保护范围应该以权利要求的保护范围为准。 Accordingly, the scope of the present invention should be defined by the scope of the claims.

Claims (15)

  1. 1、一种XDSL网络中自动选择运行模式的实现方法,其特征在于,包括: A、局端单元向用户端单元发送多模式下的一组子载波信号; B、根据用户端单元接收的子载波信号计算各子载波的信噪比,并根据所述信噪比确定各模式的能够承载的比特数; C、在XDSL网络中根据所述的各模式的能够承载的比特数确定选择的模式,包括:C1、计算窄频带模式下带内部分的比特数较相邻的宽频带模式下与窄频带带内相同的子载波集合的比特数之差作为带内增量,还计算窄频带模式带外但是属于宽频带模式带内的部分在宽频带模式下的比特数作为带外增量;C2、当所述带内增量大于带外增量时,则选择窄频带模式,否则,选择宽频带模式。 A XDSL network implemented method to automatically select the operating mode, characterized by comprising: A, central office unit sends a set of subcarrier signals in multi-user mode to the end unit; B, sub-unit according to the received UE carrier signal to noise ratio was calculated for each subcarrier, and determines said signal to noise ratio of the number of bits capable of carrying each mode according; C, in the XDSL network determines the mode selection of the number of bits of each of the pattern can be carried , including: C1, calculating the difference between the number of bits when the number of bits with the inner portion adjacent relatively narrow band mode of the wide band mode of subcarriers within the same narrow band as a band with a set of increments, further calculates the narrow band mode However, with the outer portion of the inner part of the wide band mode with the number of bits in a band wide band mode increment; C2, when delta is greater than said strip increment band, narrow-band mode is selected, otherwise, select wideband mode.
  2. 2、 根据权利要求1所述的XDSL网络中自动选4奪运行模式的实现方法,其特征在于,所述的步骤A包括:局端单元向用户端单元发送所有频段包含的子载波信号,或者,发送窄频段模式下的最高频率以上频段包含的所有子载波信号,或者发送梳状子载波信号。 2. The method as claimed in claim 4 wins achieved automatically select the operating mode of the XDSL network of claim 1, wherein said step A comprising: a central office unit sends frequency band signals comprises all sub-carriers to the user terminal unit, or , all of the highest frequency subcarrier signal in the narrow band mode of transmission bands above included, or comb-shaped sub-carrier signal transmission.
  3. 3、 根据权利要求2所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述的步骤A还包括:当发送所有频段或窄频段模式下的最高频率以上频段包含的所有子载波信号时,局端单元需要根据收到的用户端单元发出的信号幅度进行发送功率值的削减,或直接将发送功率削减一个固定功率值后,发送削减后的功率值的子载波信号到用户端单元。 3, the operating mode is automatically selected according to implementation XDSL network according to claim 2, wherein said step A further comprising: when all the sub-transmission at the highest frequency band or narrow band mode for all bands above contains when the carrier signal, the central office unit is required to reduce the transmission power value according to the amplitude of the signal received by the client unit sent, directly or a fixed power reduction transmission power value of the sub-carrier signals after the transmission power value to the user cuts end unit.
  4. 4、 根据权利要求2所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述子载波信号是周期性间隔发送。 4, the operating mode is automatically selected according to implementation XDSL network according to claim 2, wherein said sub-carrier signal is transmitted at periodic intervals.
  5. 5、 根据权利要求1、 2、 3或4所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述的步骤B包括:B1、计算各子载波的信号功率值及各子载波对应的背景噪声功率值;B2、根据所述的信号功率值和背景噪声功率值计算各子载波的信噪比;B3、根据各子载波的信噪比计算各模式下能够承载的比特数。 5, 1, XDSL network 2, 3 or 4, wherein automatically selecting the operating mode implemented method according to claim, wherein said step B comprises: B1, calculates the signal power value of each sub-carrier and each sub- carriers corresponding background noise power value; B2, calculating the SNR of each subcarrier based on the signal power value and the power value of the background noise; B3, calculating the number of bits in each mode can be carried on each subcarrier signal to noise ratio .
  6. 6、 根据权利要求5所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述的步骤B1包括:用户端单元接收局端单元发送的子载波,并计算信号功率值,当局端单元停止发送子载波时,则计算该子载波对应的背景噪声功率值。 6, selected automatically according to claim 5, wherein the XDSL network implemented method of operating modes, wherein, said step B1 comprises: means for receiving the subcarrier UE central office unit transmitted signal power value and calculates Administration when the end unit stops sending the subcarriers, the subcarriers corresponding to the background noise power value is calculated.
  7. 7、 根据权利要求5所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述的各个子载波能够承载的比特数to(/)为:Z^(Z) = log2(1 + K)(纖('),卿-"廢層)/w),其中,SiW?(/)为7b脱(/)的信噪比,训WW为T1.417定义的SNR gap,大小为9.75dB, TARSNRM为预定的目标噪声容限。 7, automatic selection according to claim 5, wherein the XDSL network implemented method of operating modes, wherein the number of bits of each subcarrier can carry to (/) is: Z ^ (Z) = log2 (1 + K) (fiber ( '), Qing -? "waste layer) / W), wherein, SiW (/) is de-7b (/) signal to noise ratio, SNR gap T1.417 training WW is defined, the size of 9.75dB, TARSNRM predetermined target noise margin.
  8. 8、 根据权利要求1、 2、 3或4所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述的步骤B包括:在用户端单元上,根据接收的子载波信号计算各子载波信噪比,并根据所述信噪比确定各模式下能够承载的比特数;或者,由用户端单元将测量获得的信息发送给局端单元,由局端单元根据所述的信息计算各子载波信噪比,并根据所述信噪比确定各模式下能够承载的比特数。 8, 1, 2, XDSL network 3 or 4, wherein automatically selecting the operating mode implemented method according to claim, wherein said step B comprises: on the client unit, according to the received sub-carrier signals calculated each sub-carrier signal to noise ratio, the signal to noise ratio and determines the number of bits can be carried in each mode according to; or by the user terminal information obtained by the measurement unit is transmitted to the central office unit, said information unit by the central office in accordance with calculated for each sub-carrier signal to noise ratio, and determines the number of bits can be carried in each mode according to the signal to noise ratio.
  9. 9、 根据权利要求5所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述的步骤C还包括:C3、当可选择模式多于2种时,若在宽频带模式和窄频带模式中根据比较带内比特增量和带外比特增量,选择将当前的窄频带模式作为宽频带模式,则以与其相邻的比其频带范围窄的模式作为窄频带模式,重新进行C1和C2;或,当选择当前的宽频带模式,则将该宽频带模式设为新的窄频带模式,将与其相邻的比其频带范围更宽的模式作为宽频带模式,重新进行C1和C2。 9, the operating mode is automatically selected to achieve a method according to claim 5, wherein the XDSL network, wherein said step C further comprises: C3, when more than two kinds of selectable modes, when a wide band mode and narrow band mode according to the comparison with the bit-band bit increment and increment the current selection mode as the narrow-band wideband mode, they are narrower than the adjacent mode as its frequency range the narrow band mode, re C1 and C2; or, when selecting the current wideband mode, the wideband mode to narrowband mode, the new, wider than the adjacent frequency range which is as wide band mode mode, and re-C1 C2.
  10. 10、 根据权利要求1、 2、 3或4所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述的各模式包括:下行带宽扩展的第二代不对称数字用户线ADSL2+annex A三种模式,和/ 或第二代不对称数字用户线ADSL2 annex A,和/或距离扩展的第二代不对称数字用户线READSL2,和/或第二代甚高速数字用户线VDSL2(G.993.2)。 10, 1, 2, XDSL network 3 or 4, wherein automatically selecting the operating mode implemented method according to claim, wherein said each mode includes: a downlink bandwidth extension of the second generation ADSL2 Asymmetric Digital Subscriber Line + annex a three modes, and / or asymmetric digital Subscriber line second generation ADSL2 annex a, and / or from the second generation extended asymmetric digital Subscriber line READSL2, and / or the second generation of very high-speed digital Subscriber line VDSL2 (G.993.2).
  11. 11、 根据权利要求1、 2、 3或4所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述的方法还包括:D、在DSL收发器训练完成时,执行步骤A至步骤C,当确定相应的运行模式后,更改当前的运行模式。 11, 1, 2, XDSL network 3 or 4, wherein automatically selecting the operating mode implemented method according to claim, wherein said method further comprises: D, upon completion of the DSL transceiver training, step A to step C, and when the corresponding operating mode is determined, change the current operating mode.
  12. 12、 根据权利要求11所述的XDSL网络中自动选择运行模式的实现方法,其特征在于,所述的步骤D包括:如果是用所有载波叠加的信号C-Reverb信号计算SNR,则在调制了4-QAM信号C-medley开始更换运行模式以及对应的频谱;如果是用C-Medley信号计算SNR,则在后面通过比特和增益表bit&gain table来调整功率语到对应的模式,相应的运行模式信息在用户端设备的消息R-MSG2中传递。 12, according to the XDSL network 11 automatically selects the operating mode implemented method as claimed in claim, wherein said step D comprises: if all the carriers are superimposed with the signal C-Reverb signal computing the SNR, the modulation of 4-QAM signal C-medley starting replacement mode of operation and the corresponding spectrum; If we use C-Medley signal calculating SNR, in the back to adjust the power spectrum to a corresponding mode bits and gains table bit & gain table, the corresponding operating mode information R-MSG2 message transfer CPE's.
  13. 13、 一种XDSL网络中自动选择运行模式的装置,其特征在于,包括:承载能力计算模块:根据用户端单元接收的子载波信号计算各子载波的信噪比,并根据所述信噪比计算各模式下的能够承载的比特数信息;模式选择模块:根据承载能力计算模块计算确定的各模式下的能够承载的比特数选择局端单元与用户端单元间的运行模式,包括:计算窄频带模式下带内部分的比特数较相邻的宽频带模式下与窄频带带内相同的子载波集合的比特数之差作为带内增量,还计算窄频带模式带外但是属于宽频带模式带内的部分在宽频带模式下的比特数作为带外增量;当所述带内增量大于带外增量时,则选择窄频带模式,否则,选择宽频带模式。 13. A XDSL network operation mode automatic selection means, characterized by comprising: carrying capacity calculation module: based on each subcarrier calculated subcarrier signal to noise ratio received by the user terminal unit, and according to the signal to noise ratio calculating the number of bits in each mode can carry information; mode selection module: the number of bits is calculated at each calculation module determines the mode selection of the operating mode can be carried between the unit and the central office end unit according to the bearing capacity of the user, comprising: calculating a narrow the difference between the number of bits in the same sub-carrier within a narrow frequency band as in-band set increments, further calculates the narrow band mode when the number of bits with the outer band portion of the band mode but more adjacent wide band mode of the wide band mode belongs portion with the number of bits within the band as a wide band mode increment; when delta is greater than the in-band band increments, the narrow band mode is selected, otherwise, selecting a wide band mode.
  14. 14、 一种XDSL网络中自动选择运行模式的系统,包括用户端单元和局端单元,其特征在于,包括上述权利要求13所述的XDSL网络中自动选择运行模式的装置,且还包括:设置于局端单元中的子载波发送模块,用于根据预定的条件进行子载波的发送处理;设置于用户端单元中的测量模块,用于测量子载波的信号功率和对应的背景噪声功率,并提供给所述的承载能力计算模块。 14. A XDSL network system automatically selecting the operating mode, including a user side unit and a central office unit, characterized by comprising the above-described means XDSL network of claim 13 selected in the automatic operating mode, and further comprising: setting central office unit subcarrier transmission module for transmitting the processing condition according to a predetermined subcarrier; provided to the user side unit measurement module for measuring the signal power of subcarriers and the corresponding background noise power, and supplied to the bearing capacity of the module.
  15. 15、 根据权利要求14所述的XDSL网络中自动选择运行模式的系统,其特征在于,所述的自动选择运行模式的装置设置于用户端单元或局端单元上,或者,独立于用户端单元和局端单元设置。 15, the system automatically selects the operation mode according XDSL network according to claim 14, wherein said automatic mode selection means operating on the client unit provided at the central office or unit, or an end user unit independently and a central office unit is provided.
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