CN103765789B - Line initialization method, apparatus, and system - Google Patents

Abstract

The embodiment of the present invention provides a line initialization method, no matter in the uplink direction or the downlink direction, before the coefficient matrix (Cancellation coefficient matrix and Precode coefficient matrix) is not obtained, no data information is sent at the position of the data symbol in the corresponding direction ; The CO first obtains the transmission channels on all lines in the uplink direction to eliminate the crosstalk generated during data transmission in the uplink direction of all lines; in this way, it can ensure that there is no crosstalk in the uplink direction after the return channel of the error sample in the uplink is established. , the crosstalk channel in the downlink direction can be carried on the data symbol sent by the CPE to the CO, and the CO can calculate the transmission channel in the downlink direction of the line according to the crosstalk channel information in the downlink direction fed back by the CPE, so as to obtain the downlink prediction Coding (Precode) coefficient matrix to eliminate crosstalk in the downlink direction; therefore, there is no impact on the business between the CO and CPE, and the impact of new lines on business data is minimized.

Description

A circuit initialization method, device and system

technical field

The invention relates to the field of data communication, in particular to a line initialization method, device and system.

Background technique

Digital Subscriber Line (DSL, Digital Subscriber Line) is a high-speed data transmission technology transmitted on twisted-pair telephone lines, such as UTP (Unshielded Twist Pair). There are multiple DSL lines in the DSL system. At present, a DSL access multiplexer (DSLAM, Digital Subscriber Line Access Multiplexer) usually provides access services for multiple DSL lines. However, due to the principle of electromagnetic induction, crosstalk (Crosstalk) will occur between the multiple signals connected to the DSLAM. Twisted pair cables have strong crosstalk at high frequencies. To eliminate crosstalk, for example, vectored (Vectored) DSL technology can be used to eliminate far-end crosstalk.

The existing Vectored DSL technology mainly utilizes the characteristics of joint transmission and reception at the DSLAM end, and uses signal processing methods to offset FEXT interference. Ultimately eliminate FEXT interference in each signal. FIG. 1 shows a schematic diagram of synchronous transmission and synchronous reception at the DSLAM side. The network-side equipment is connected to M pieces of customer-side equipment (Customer premise Equipment, CPE) through M twisted-pair wires.

The shared channel H in the downlink or uplink can be expressed as a matrix on the kth subcarrier (tone) in the frequency domain:

h _ij is the transmission equation representing line pair j to line pair i, where 0≤i≤M, 0≤j≤M. In actual situations, i and j are equal and equal to the number of lines of the Vectored DSL system, which is set to M here. Then H is a M×M channel transmission matrix. Let x be an M×1 channel input vector, y be an M×1 channel output vector, and n be an M×1 noise vector. Finally, the channel transmission equation is expressed in the following form:

y=Hx+n

In the process of uplink signal transmission, the central office (Central Office, CO) end, that is, the network side equipment, performs joint reception processing of the signal, and introduces a crosstalk canceller W at the receiving end, then the received signal is:

$\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; Wy</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; wxya</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; W</span>}$

When WH is a diagonal matrix, crosstalk will be eliminated.

In the downlink signal transmission process, the joint transmission processing of the signal is performed at the CO end, and a precoder P is introduced at the CO end, and the transmitted signal is:

$\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; Px</span>}$

The signal received by the receiver is:

$\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; the\; y</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; h</span>}\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; HPx</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; no</span>}$

When HP is a diagonal array, crosstalk will be eliminated.

It is known comprehensively that the key point in the Vectored-DSL technology is to estimate the downlink precoding matrix P and the uplink cancellation matrix W. Obtain H by measurement, and then calculate W and P according to the relationship between H and W, P. Through Sync Symbol synchronization, the Vectoring Control Entity (VCE) uniformly allocates pilot sequences (Pilot Sequence) to all lines. Orthogonal pilot sequence (Vector pilot sequence) is carried in the special DMT symbol that needs to be sent to measure H. This special DMT symbol is also called Vector training symbol. The receiver estimates the crosstalk channel H by receiving these Vector training symbols. The process is called Vector training.

When a new line is initialized, in order to facilitate the description of how to obtain H, the matrix of the direct channel and the crosstalk channel between the lines is written as: $h=\left(\begin{array}{cc}{h}_{\mathrm{SS}}& h_{\mathrm{SJ}}\\ h_{\mathrm{js}}& h_{\mathrm{JJ}}\end{array}\right),$

Among them: _HSS is the crosstalk sub-matrix from the line in the showtime stage (that is, the data transmission stage) to the line in the showtime stage; the showtime stage refers to the data transmission stage entered after the initialization and training are completed;

H _SJ is the crosstalk sub-matrix from the initialization line to the line in the showtime stage;

H _JS is the crosstalk sub-matrix from the line in the showtime stage to the initialization line;

H _JJ is the crosstalk sub-matrix from initialization circuit to initialization circuit;

Since the H _JS and H _JJ can only be fed back to the CO by the VCE after the establishment of the uplink return channel in the training phase, and when the newly added line is initialized, the initialization line does not have the ability to feed back the downlink Error Sample. In general, under the condition of not obtaining the actual H _JS and H _JJ , the formula can also be used directly according to the linear precoding technology $P=\left(\begin{array}{cc}{h}_{\mathrm{SS}}^{-1}{\mathrm{D.}}_S& -h_{\mathrm{SS}}^{-1}{h}_{\mathrm{SJ}}\\ 0& 1\end{array}\right)$ P is estimated, where D _S =Diag(H _SS ). However, as a new generation of DSL technology, G.fast technology adopts the increase of frequency or the enhancement of coupling. When the crosstalk channel is enhanced to a certain extent compared with the direct channel, the effect of precoding the line directly using the P calculated by the above formula It will be significantly worse, so that the crosstalk from the initialization line received by the line in the showtime phase cannot be well offset, so that the SNR (Signal-Noise Ratio, signal-to-noise ratio) of the line in the showtime phase will decrease and may cause bit errors.

Contents of the invention

Embodiments of the present invention provide a line initialization method, device and system, which are used to minimize the impact of new line addition on service data.

In the first aspect, a line initialization method is provided, including:

The CPE receives the superframe of the OP-SILENT signal or OP-PILOT signal sent by the CO, wherein the superframe of the OP-SILENT signal or OP-PILOT signal has no signal at the position of the data symbol in the downlink direction, and the synchronization in the downlink direction The synchronization symbol is carried on the symbol position; the synchronization symbol information carried on the synchronization symbol position in the downlink direction is used for the CPE to calculate the crosstalk channel of other lines on the line where the CPE is located in the downlink direction, that is, H _JS ; the other The line is a line connecting other CPEs to the CO;

The CPE sends a superframe of the R-P-SILENT signal to the CO, wherein the superframe of the R-P-SILENT signal does not have any signal at the position of the data symbol in the uplink direction, and the position of the sync symbol in the uplink direction carries a synchronization symbol; The synchronization symbol information on the synchronization symbol position in the uplink direction is used to calculate the transmission channel on all lines in the uplink direction; the transmission channel on all lines in the uplink direction is used for the CO to eliminate data in the row direction on all lines Crosstalk generated during transmission;

The CPE sends the superframe of the R-ERROR-SAMPLE signal to the CO, wherein the superframe of the R-ERROR-SAMPLE signal carries data information at the position of the data symbol in the uplink direction, and the data information includes the H _JS .

In the first possible implementation manner of the first aspect, all the superframes constructed during the period when the CPE sends the R-P-SILENT signal do not have any signal at the data symbol position in the uplink direction, and there is no signal at the sync symbol position in the uplink direction The synchronization symbol is carried on it.

In combination with the first aspect or the first possible implementation manner of the first aspect, in the second possible implementation manner, before sending the superframe of the R-P-SILENT signal, the CPE sends the superframe of the R-P-QUIET signal to The CO, but all superframes constructed during the period when the CPE sends the R-P-QUIET signal do not send signals at the positions of data symbols and synchronization symbols in the uplink direction.

In combination with the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in the third possible implementation manner, the CPE sends the R-ERROR-SAMPLE signal All the superframes constructed in the stage of , carry data information at the data symbol positions in the uplink direction.

Combining the first aspect, the first possible implementation of the first aspect, the second possible implementation of the first aspect, or the third possible implementation of the first aspect, in the fourth possible implementation , the CPE receives the synchronization symbol offset carried by the CO through the short message, and according to the synchronization symbol offset, moves the sending position of the synchronization symbol in the superframe of the R-P-SILENT signal, so that the CPE is on the line The sync symbol on the line arrives at the CO at the same time as the sync symbols on the other lines.

In the second aspect, a line initialization method is provided, the lines are multiple lines connecting a CO to multiple CPEs, wherein the (M+1)th line corresponding to the (M+1)th CPE and other M lines Forming crosstalk, M≥1; the method includes:

The CO sends the superframe of the OP-SILENT signal or OP-PILOT signal to the (M+1)th CPE corresponding to the (M+1)th line, wherein the OP-SILENT signal or OP- The superframe of the PILOT signal has no signal at the data symbol position in the downlink direction, but carries a sync symbol at the sync symbol position in the downlink direction; the sync symbol information at the sync symbol position in the downlink direction is used to calculate the The crosstalk channel of the M lines to the (M+1)th line, that is, H _JS ;

The CO receives the superframe of the R-P-SILENT signal sent by the (M+1)th CPE, wherein the superframe of the R-P-SILENT signal has no signal at the position of the data symbol in the uplink direction, and the superframe of the R-P-SILENT signal in the uplink direction The synchronization symbol position carries the synchronization symbol; the CO calculates the transmission channels on the entire (M+1) lines in the uplink direction according to the received synchronization symbol information at the synchronization symbol position of the superframe of the R-P-SILENT signal, The transmission channels on the (M+1) lines in the uplink direction are used by the CO to eliminate crosstalk generated during data transmission in the uplink direction on all (M+1) lines;

The CO receives the superframe of the R-ERROR-SAMPLE signal sent by the (M+1)th CPE, wherein the superframe of the R-ERROR-SAMPLE signal carries data information at the position of the data symbol in the uplink direction, and the The data information includes the H _JS .

In the first possible implementation manner of the second aspect, the CO calculates the transmission of the (M+1) lines in the downlink direction according to the H _JS information fed back by the (M+1)th CPE channel.

In combination with the second aspect or the first possible implementation manner of the second aspect, in the second possible implementation manner, all superstructures constructed during the stage when the CO sends the O-P-SILENT signal or the stage when the O-P-PILOT signal is sent In a frame, there is no signal at the position of the data symbol in the downlink direction, and a sync symbol is sent at the position of the sync symbol in the downlink direction.

In combination with the second aspect, the first possible implementation of the second aspect, or the second possible implementation of the second aspect, in the third possible implementation, the CO at the (M+1) The synchronization symbols in the superframe of the O-P-SILENT signal or O-P-PILOT signal sent on one line are sent simultaneously with the synchronization symbols in the superframe on other lines.

In combination with the second aspect, the first possible implementation of the second aspect, the second possible implementation of the second aspect, or the third possible implementation of the second aspect, in the fourth possible implementation , when the CO receives the superframe of the R-P-SILENT signal sent by the (M+1)th CPE, the CO measures the uplink sync symbol on the Mth line and the uplink Synchronize the symbol offset and send it to the (M+1)th CPE.

In the third aspect, a network side device is provided, the network side device is connected to the (M+1)th CPE through at least the (M+1)th line; the (M+1)th line and other M Lines form crosstalk, and the network side equipment includes a signal transceiver and an uplink transmission channel processing unit;

The signal transceiver sends the superframe of the O-P-SILENT signal or the O-P-PILOT signal to the (M+1)th CPE, wherein the data in the superframe of the O-P-SILENT signal or the O-P-PILOT signal is in the downlink direction There is no signal at the symbol position, but a sync symbol is carried at the sync symbol position in the downlink direction;

The signal transceiver receives the superframe of the R-P-SILENT signal sent by the (M+1)th CPE, wherein the superframe of the R-P-SILENT signal has no signal at the position of the data symbol in the uplink direction, and the uplink The sync symbol position in the direction carries the sync symbol;

The uplink transmission channel processing unit calculates the transmission channels on all lines in the uplink direction according to the synchronization symbol information at the synchronization symbol position in the superframe of the received R-P-SILENT signal, and according to the calculated uplink direction The transmission channel on the upward (M+1) lines eliminates the crosstalk generated during data transmission in the uplink direction on all (M+1) lines;

The signal transceiver receives the superframe of the R-ERROR-SAMPLE signal sent by the (M+1)th CPE, wherein the superframe of the R-ERROR-SAMPLE signal carries data information at the position of the data symbol in the uplink direction , the data information includes the crosstalk channel between the M lines in the downlink direction and the (M+1)th line, that is, H _JS .

In the first possible implementation manner of the third aspect, the network side device further includes a downlink transmission channel processing unit, and the downlink transmission channel processing unit is based on the H _JS information fed back by the (M+1)th CPE , calculate the transmission channels of the (M+1) lines in the downlink direction.

In combination with the third aspect and the first possible implementation manner of the third aspect, in the second possible implementation manner, the signal transceiver is constructed in the stage of sending the O-P-SILENT signal or the stage of sending the O-P-PILOT signal In all superframes, there is no signal at the position of the data symbol in the downlink direction, and a sync symbol is sent at the position of the sync symbol in the downlink direction.

In combination with the third aspect, the first possible implementation of the third aspect, or the second possible implementation of the third aspect, in the third possible implementation, the signal transceiver at the (M+ 1) The synchronization symbols in the superframe of the O-P-SILENT signal or O-P-PILOT signal sent on one line are sent simultaneously with the synchronization symbols in the superframe on other lines.

In combination with the third aspect, the first possible implementation of the third aspect, the second possible implementation of the third aspect, or the third possible implementation of the third aspect, in the fourth possible implementation , the network side device further includes an offset acquisition unit, and the offset acquisition unit calculates the uplink synchronization symbol and other Uplink synchronization symbol offsets on the M lines, and send the offsets to the (M+1)th CPE through the signal transceiver.

In the fourth aspect, a user-side device is provided, the user-side device is connected to the CO through the (M+1)th line, and the (M+1)th line is connected to other M lines connected to the CO forming crosstalk, the user side equipment includes a signal transceiver and a downlink transmission channel calculation unit;

The signal transceiver receives the OP-SILENT signal or the superframe of the OP-PILOT signal sent by the CO, wherein there is no signal at the position of the data symbol in the downlink direction in the superframe of the OP-SILENT signal or the OP-PILOT signal, and A synchronization symbol is carried at the position of the synchronization symbol in the downlink direction; the downlink transmission channel calculation unit calculates the (M+1)th line in the downlink direction according to the synchronization symbol information at the position of the synchronization symbol in the downlink direction The crosstalk channel for the M lines, namely H _JS ;

The signal transceiver sends the superframe of the R-P-SILENT signal to the CO, wherein the superframe of the R-P-SILENT signal does not have any signal at the position of the data symbol in the uplink direction, and the position of the sync symbol in the uplink direction carries synchronization symbol; the synchronization symbol information at the synchronization symbol position in the uplink direction is used to calculate the transmission channel on the entire (M+1) lines in the uplink direction; the transmission on the entire (M+1) lines in the uplink direction The channel is used to eliminate crosstalk between the entire (M+1) lines during data transmission in the uplink direction;

The signal transceiver sends the superframe of the R-ERROR-SAMPLE signal to the CO, wherein the superframe of the R-ERROR-SAMPLE signal carries data information at the position of the data symbol in the uplink direction, and the data information includes The H _JS .

In the first possible implementation of the fourth aspect, all the superframes constructed during the period when the signal transceiver 902 sends the R-P-SILENT signal do not have any signal at the position of the data symbol in the uplink direction, and the synchronization in the uplink direction Symbol positions carry sync symbols.

In combination with the fourth aspect and the first possible implementation manner of the fourth aspect, in the second possible implementation manner, the signal transceiver sends the superframe of the R-P-QUIET signal before the superframe of the R-P-SILENT signal The frame is sent to the CO, but no signal is sent at the position of the data symbol and the synchronization symbol in the uplink direction in the superframe of the R-P-QUIET signal.

With reference to the fourth aspect, the first possible implementation of the fourth aspect, or the second possible implementation of the fourth aspect, in the third possible implementation, the signal transceiver 902 sends the R-ERROR All superframes constructed in the phase of the SAMPLE signal carry data information at the data symbol position in the uplink direction.

Combining the fourth aspect, the first possible implementation of the fourth aspect, the second possible implementation of the fourth aspect, or the third possible implementation of the fourth aspect, in the fourth possible implementation , the user side equipment further includes an offset acquisition unit, the offset acquisition unit receives the synchronization symbol offset carried by the CO through the short message, and according to the synchronization symbol offset, moves the R-P-SILENT signal The sending position of the synchronization symbol in the superframe is such that the synchronization symbol on the (M+1)th line and the synchronization symbols on the other M lines reach the CO at the same time.

According to a fifth aspect, a network system is provided, the system includes the above-mentioned network-side device and a plurality of the above-mentioned user-side devices, and the network-side device is connected to each of the multiple user-side devices through multiple lines.

Utilize this embodiment, utilize this embodiment, first obtain the transmission channel on all lines on the uplink direction, to eliminate the crosstalk that produces when data transmission on the uplink direction of all lines; After channeling, if there is no crosstalk in the uplink direction, the data symbols sent by the CPE to the CO can bear the crosstalk channel in the downlink direction. The transmission channel, so as to obtain the downlink precoding (Precode) coefficient matrix to eliminate the crosstalk in the downlink direction. In this process, whether it is the uplink direction or the downlink direction, no data information is sent at the data symbol position in the corresponding direction before the coefficient matrix (Cancellation coefficient matrix and Precode coefficient matrix) is obtained. Therefore, there is no impact on the service between the CO and the CPE, and the impact of new lines on service data is minimized.

Description of drawings

Fig. 1 is a schematic diagram of DSLAM synchronous transmission and synchronous reception in the DSL architecture;

Fig. 2 is the TDD frame structure of the transmission signal on the DSL line;

Fig. 3 is the superframe structure of the transmission signal on the DSL line;

FIG. 4 is a flow chart of a line initialization method according to an embodiment of the present invention;

FIG. 5 is a flowchart of another line initialization method according to an embodiment of the present invention;

FIG. 6 is a CO and CPE signal transmission phase diagram of an embodiment of the present invention;

FIG. 7 is a flowchart of another line initialization method according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a network side device according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a user-side device according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a system composition according to an embodiment of the present invention;

Fig. 11 is a schematic structural diagram of a network component according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In the DSL architecture shown in Figure 1, the network-side equipment (CO) and each customer-side equipment (CustomerPremise Equipment, CPE) include a sending unit (Tx) and a receiving unit (Rx); in FTTD (Fiber To The Distribution point ) deployment scenario, the function of the CO on the network side will be migrated to the distribution point (DP). The DP point reaches multiple lines of multiple CPEs in the user's home. During the Showtime phase, the signal transmission on the lines adopts the TDD (Time Division Duple, time division duplex) frame structure and superframe structure shown in Figures 2 and 3. Each TDD frame defines the time slot for sending and receiving data symbols (Data Symbol) in the uplink and downlink, and the first DMT (Discrete Multi-Tone, discrete multi-tone) symbol in the downlink sending direction in each superframe is the downlink sending direction The synchronization symbol (Sync Symbol), the first DMT symbol in the uplink transmission direction is the synchronization symbol in the uplink transmission direction. For example, a TDD frame can be composed of 36 DMTs, then TF is equal to 36 DMTs; a superframe can be composed of 8 TDD frames; the first DMT symbol of the first TDD frame in the superframe is the downlink transmission The synchronous symbol of direction, if the duration of a TDD frame is about 0.75 milliseconds, the duration of a superframe is about 6 milliseconds.

In the embodiment of the present invention, the line initialization stage adopts the same TDD frame structure and superframe structure as the showtime stage, and the Vector training signal can only be sent in the synchronization symbols of the superframe structure. Synchronous symbols are generally composed of multiple audio tones, generally about 2048 tones, and can send vector pilot sequences (Vector pilot sequences), clock recovery pilots (timing recovery), synchronization flags (Sync Flag), short Message (short message, short message generally only has a few bytes of message), etc. For example, the odd-numbered tone of the synchronization symbol is used for the tone of Vector training, and the even-numbered tone is used to send the synchronization mark, the clock recovery pilot, and the short message; more specifically, the index unit digits of the even-numbered tone are 0, 4, and 8 It is used to send short messages, and the even tone whose unit digit of the index is 2,6 is used to send the synchronization identifier. In the exception, two or three tones are selected for sending the clock recovery pilot.

An embodiment of the present invention provides a line initialization method, as shown in FIG. 4, the method includes:

Step 401: The CPE receives the superframe of the OP-SILENT signal (the silence signal of the central office transceiver) or the OP-PILOT signal (the pilot signal transmitted by the central office transceiver) sent by the CO, wherein the OP-SILENT signal or the OP-PILOT signal The superframe has no signal at the position of the data symbol in the downlink direction, and carries a sync symbol at the position of the sync symbol in the downlink direction; the sync symbol information carried at the position of the sync symbol in the downlink direction is used for the CPE to calculate the The crosstalk channel of other lines other than the line where the CPE is located to the line where the CPE is located in the downlink direction, that is, _HJS ; the other lines are lines connected to other CPEs and the CO;

Step 403: The CPE sends a superframe of the R-P-SILENT signal (remote transceiver silence signal) to the CO, wherein the superframe of the R-P-SILENT signal has no signal at the position of the data symbol in the uplink direction, and Synchronization symbols are carried on the synchronization symbol positions in the uplink direction; the synchronization symbol information on the synchronization symbol positions in the uplink direction is used to calculate the transmission channels on all lines in the uplink direction; the transmission channels on all lines in the uplink direction are used for The CO eliminates crosstalk generated during data transmission in the uplink direction on all lines;

Step 405: The CPE sends the superframe of the R-ERROR-SAMPLE signal (remote transceiver feedback error pattern signal) to the CO, wherein the superframe of the R-ERROR-SAMPLE signal is at the data symbol position in the uplink direction The upper bears data information, and the data information includes the H _JS .

It should be noted that step 401 and step 403 are not sequential, and the CPE can send the superframe of the R-P-SILENT signal to the CO before or after the CPE receives the superframe of the O-P-SILENT signal or O-P-PILOT signal sent by the CO; similarly , in subsequent embodiments, the superframe of the O-P-SILENT signal or O-P-PILOT signal sent by the CO may also be performed before or after the CO receives the superframe of the R-P-SILENT signal sent by the CPE, which will be described uniformly here.

Utilize this embodiment, first acquire the transmission channels on all lines in the uplink direction, to eliminate the crosstalk generated during data transmission in the uplink direction of all lines; If there is no crosstalk in the upward direction, the data symbols sent by the CPE to the CO can bear the crosstalk channel in the downlink direction, and the CO can calculate the transmission channel in the downlink direction of the line according to the crosstalk channel information in the downlink direction fed back by the CPE, thus A downlink precoding (Precode) coefficient matrix is obtained to eliminate crosstalk in the downlink direction. In this process, whether it is the uplink direction or the downlink direction, no data information is sent at the data symbol position in the corresponding direction before the coefficient matrix (Cancellation coefficient matrix and Precode coefficient matrix) is obtained. Therefore, there is no impact on the service between the CO and the CPE, and the impact of new lines on service data is minimized.

In the following, in combination with specific scenarios, an embodiment of the present invention provides another method for initializing a line, where the line is a line connecting a CO to multiple CPEs. In this scenario, multiple CPEs are connected to CO or Dp through multiple lines, among which M lines have entered the showtime stage, and when the (M+1)th line corresponding to the (M+1)th CPE is newly added , that is, after entering the channel discovery (Channel-discovery) stage, the (M+1)th line corresponding to the (M+1)th CPE forms crosstalk with other M lines; from the (M+1)th CPE side For description, the other M CPEs are collectively referred to as other CPEs; the M≥1; the method is shown in Figure 5, including:

Step 501: The (M+1)th CPE receives the superframe of the OP-SILENT signal or OP-PILOT signal sent by the CO, as shown in Figure 6, wherein the OP-SILENT signal or OP-PILOT signal The superframe has no signal on the data symbol position of the downlink direction, and carries the synchronization symbol on the synchronization symbol position of the downlink direction; according to the superframe of the OP-SILENT signal or OP-PILOT signal, on the synchronization symbol position of the downlink direction The synchronous symbol information, calculate the crosstalk channel of the (M+1)th line in the downlink direction to the M lines in the showtime phase, that is H _JS .

Further, in all the superframes constructed in the phase of the CO sending the O-P-SILENT signal or the phase of sending the O-P-PILOT signal, there is no signal at the position of the data symbol in the downlink direction, and a synchronization symbol is sent at the position of the synchronization symbol in the downlink direction symbol.

Since the synchronization symbol information sent on the synchronization symbol of the O-P-SILENT signal or the superframe of the O-P-PILOT signal contains the Vector pilot sequence, after receiving the superframe of the O-P-SILENT signal, the CPE can calculate the newly added The line is the crosstalk channel of the above (M+1)th line to the M lines in the showtime stage. The calculation method of obtaining the line crosstalk channel according to the Vector pilot sequence is the prior art, and will not be described in depth here.

It should be noted that the channel discovery stage is the channel discovery stage after the handshake stage (Handshake) process specified in the ITU-T standard G.994.1. The channel discovery stage includes several signal stages, such as the stage of sending the O-P-PILOT signal (also known as the O-P-PILOT signal phase) is one of them. The superframe of the O-P-PILOT signal phase mainly sends the O-P-PILOT signal, and may also send special symbols in special positions, such as sending synchronization symbols at the beginning of the superframe.

Step 503: The (M+1)th CPE sends a superframe of the R-P-SILENT signal to the CO, wherein the superframe of the R-P-SILENT signal has no signal at the position of the data symbol in the uplink direction, and the uplink Synchronization symbols are carried on the synchronization symbol positions in the uplink direction; the synchronization symbol information on the synchronization symbol positions in the uplink direction is used to calculate the transmission channels on the entire (M+1) lines in the uplink direction; the entire (M The transmission channel on +1) lines is used to eliminate crosstalk between the entire (M+1) lines during data transmission in the uplink direction.

Further, all superframes constructed during the period when the (M+1)th CPE sends the R-P-SILENT signal do not have any signal at the position of the data symbol in the uplink direction, while the position of the sync symbol in the uplink direction carries a synchronization symbol.

Since the synchronization symbol information in the synchronization symbol position of the superframe of the R-P-SILENT signal sent by the CPE contains the Vector pilot sequence, after the CO receives the superframe of the R-P-SILENT signal, it can calculate that the showtime in the uplink direction is The crosstalk channel of the M lines in the stage to the newly added line, that is, the (M+1)th line above.

In the uplink direction, the crosstalk channel of the M lines in the showtime phase of the newly added line can be obtained through the CPE feedback on other lines, the crosstalk channel of the M lines in the showtime phase to itself, and the newly added line's own pair It is easy to obtain its own crosstalk channels; then the CO can obtain the transmission on the entire (M+1) lines in the uplink direction after measuring the crosstalk channels of the M lines newly added to the line pair in the showtime stage in the uplink direction. channel, thereby eliminating crosstalk in the uplink direction.

According to the handshake process specified in G.994.1, before the superframe of the sent R-P-SILENT signal, it is necessary to send the superframe of the R-P-QUIET signal (quiet signal of the remote transceiver); so, further, this step also includes step 503 -1 (not marked in the figure): Before sending the superframe of the R-P-SILENT signal, the (M+1)th CPE sends the superframe of the R-P-QUIET signal to the CO, but the (M+ 1) All superframes constructed during the period when the CPE sends the R-P-QUIET signal do not send signals at the positions of data symbols and synchronization symbols in the uplink direction; that is, the superframe of the R-P-QUIET signal is equivalent to an empty frame.

Step 505: The (M+1)th CPE sends a superframe of the R-ERROR-SAMPLE signal to the CO, wherein the superframe of the R-ERROR-SAMPLE signal carries data at the position of the data symbol in the uplink direction Information, the data information includes the crosstalk channel between the M lines and the (M+1)th line in the showtime stage in the downlink direction, that is, H _JS . The H _JS information is used by the CO to calculate transmission channels of the (M+1) lines in the downlink direction.

Further, all superframes constructed during the period when the CPE sends the R-ERROR-SAMPLE signal carry data information at the position of the data symbol in the uplink direction.

Furthermore, when the CPE sends the superframe of the R-P-SILENT signal in step 503, the CO measures the uplink synchronization symbols on the M line and the offsets of the M uplink synchronization symbols, and sends them to the Describe the (M+1)th CPE. The (M+1)th CPE receives the synchronization symbol offset carried by the CO through the short message, and according to the synchronization symbol offset, moves the sending position of the synchronization symbol in the superframe of the R-P-SILENT signal, so that the ( The synchronization symbols on the M+1) lines and the synchronization symbols on the other M lines in the showtime phase reach the CO at the same time.

Using this embodiment, the uplink crosstalk cancellation (Cancellation) coefficient matrix on the (M+1) lines is first obtained, and the return channel of the uplink Error Sample is established, so that under the condition that there is no crosstalk in the uplink direction, The data symbols sent to the CO carry the crosstalk channel of the M lines in the showtime stage in the downlink direction to the newly added (M+1)th line, and the CO can use the crosstalk in the downlink direction fed back by the CPE Channel information, calculating the transmission channels on the (M+1) lines, so as to obtain a downlink precoding (Precode) coefficient matrix to eliminate crosstalk in the downlink direction. In this process, whether it is the uplink direction or the downlink direction, no data information is sent at the data symbol position in the corresponding direction before the coefficient matrix (Cancellation coefficient matrix and Precode coefficient matrix) is obtained. Therefore, there is no impact on the services of all users in the showtime period between the CO and the CPE, and the impact of new lines on the service data in the showtime period is minimized.

The embodiment of the present invention also provides a line initialization method. The line is a line connecting a CO to multiple CPEs. M lines have entered the showtime stage, and the (M+1)th CPE corresponding to the (M+1)th CPE ) lines are newly added, that is, after entering the channel discovery (Channel-discovery) stage, describe from the CO side, as shown in Figure 7, the method includes:

Step 701: The CO sends a superframe of O-P-SILENT signal or O-P-PILOT signal to the (M+1)th CPE corresponding to the (M+1)th line, wherein the O-P-SILENT signal Or the superframe of the O-P-PILOT signal has no signal at the position of the data symbol in the downlink direction, but carries a sync symbol at the position of the sync symbol in the downlink direction;

The synchronization symbol information at the synchronization symbol position in the downlink direction can be used to calculate the crosstalk channel for the (M+1)th line of the M lines in the showtime stage in the downlink direction, that is, H _JS .

Further, in all the superframes constructed during the stage when the CO sends the O-P-SILENT signal or the stage of sending the O-P-PILOT signal, there is no signal at the position of the data symbol in the downlink direction, and a sync symbol is sent at the position of the sync symbol in the downlink direction.

Furthermore, the synchronization symbol in the superframe of the O-P-SILENT signal or the O-P-PILOT signal sent by the CO on the (M+1)th line is sent simultaneously with the synchronization symbols in the superframe on other lines.

Step 703: The CO receives the superframe of the R-P-SILENT signal sent by the (M+1)th CPE, wherein the superframe of the R-P-SILENT signal has no signal at the position of the data symbol in the uplink direction, and The synchronization symbol position in the uplink direction carries the synchronization symbol; the CO calculates the synchronization symbol information on the entire (M+1) lines in the uplink direction according to the received synchronization symbol information at the synchronization symbol position in the superframe of the R-P-SILENT signal The transmission channel, the transmission channel on the (M+1) lines in the uplink direction can be used by the CO to eliminate crosstalk generated during data transmission in the uplink direction on all the (M+1) lines.

Further, all superframes constructed during the period when the CPE sends the R-P-SILENT signal do not have any signal at the position of the data symbol in the uplink direction, while the position of the sync symbol in the uplink direction carries the synchronization symbol.

Furthermore, this step also includes step 703-1 (not marked in the figure): before receiving the superframe of the R-P-SILENT signal, the CO receives the R-P-QUIET signal sent by the (M+1)th CPE , wherein all superframes constructed in the stage when the (M+1) CPE sends the R-P-QUIET signal do not carry signals at the positions of data symbols and synchronization symbols in the uplink direction.

Step 705: The CO receives the superframe of the R-ERROR-SAMPLE signal sent by the (M+1)th CPE, wherein the superframe of the R-ERROR-SAMPLE signal carries data information at the position of the data symbol in the uplink direction , the data information includes the crosstalk channel between the M lines and the (M+1)th line in the showtime phase in the downlink direction, that is, H _JS .

Further, all superframes constructed during the period when the CPE sends the R-ERROR-SAMPLE signal carry data information at the position of the data symbol in the uplink direction.

Moreover, the method of this embodiment further includes, step 707: the CO calculates the transmission channel of the (M+1)th line in the downlink direction according to the H _JS information fed back by the (M+1)th CPE .

After the CO obtains the H _JS information fed back by the (M+1)th CPE, it combines the acquired H _SS and H _SJ in the downlink direction (the acquisition method of H _SS is the existing technology, and will not be described here ; H _SJ can be obtained from information reported to the CO by other lines), and the transmission channel of the entire (M+1) lines in the downlink direction can be calculated.

Further, when the CO in the above step 703 receives the superframe of the R-P-SILENT signal sent by the (M+1)th CPE, the CO measures the uplink synchronization symbol on the Mth line and the M The uplink synchronization symbol offset of the bar is sent to the (M+1)th CPE. The (M+1)th CPE receives the synchronization symbol offset carried by the CO through the short message, and can move the sending position of the synchronization symbol in the superframe of the R-P-SILENT signal according to the offset, so that the ( The synchronization symbols on the M+1) lines and the synchronization symbols on the other M lines in the showtime phase reach the CO at the same time.

Using this embodiment, first obtain the uplink crosstalk cancellation (Cancellation) coefficient matrix on the (M+1) lines, so that the data symbols received by the CO can be carried on the condition that there is no crosstalk in the uplink direction. If there is a crosstalk channel between the M lines in the showtime stage in the downlink direction and the newly added (M+1)th line, the CO can calculate the ( M+1) transmission channels on the lines, so as to obtain the downlink precoding (Precode) coefficient matrix to eliminate the crosstalk in the downlink direction.

The embodiment of the present invention also provides a network side device 800, the network side device 800 is connected to the (M+1)th CPE at least through the (M+1)th line; the (M+1)th line Forming crosstalk with other M lines, as shown in FIG. 8 , the network side device 800 includes a signal transceiver 802 and an uplink transmission channel processing unit 804;

The signal transceiver 802 sends the superframe of the O-P-SILENT signal or the O-P-PILOT signal to the (M+1)th CPE, where the superframe of the O-P-SILENT signal or the O-P-PILOT signal is in the downlink direction There is no signal at the position of the data symbol, but a sync symbol is carried at the position of the sync symbol in the downlink direction;

The signal transceiver 802 receives the superframe of the R-P-SILENT signal sent by the (M+1)th CPE, wherein the superframe of the R-P-SILENT signal has no signal at the position of the data symbol in the uplink direction, and The sync symbol position in the uplink direction carries the sync symbol;

The uplink transmission channel processing unit 804 calculates transmission channels on all lines in the uplink direction according to the synchronization symbol information at the synchronization symbol position in the superframe of the received R-P-SILENT signal, and according to the calculated uplink The transmission channel on (M+1) lines in the row direction eliminates crosstalk generated during data transmission in the uplink direction on all (M+1) lines.

The signal transceiver 802 receives the superframe of the R-ERROR-SAMPLE signal sent by the (M+1)th CPE, wherein the superframe of the R-ERROR-SAMPLE signal carries data at the position of the data symbol in the uplink direction Information, the data information includes the crosstalk channel between the M lines and the (M+1)th line in the showtime stage in the downlink direction, that is, H _JS .

Further, in all the superframes constructed in the stage of sending the O-P-SILENT signal or the stage of sending the O-P-PILOT signal by the signal transceiver 802, there is no signal at the data symbol position in the downlink direction, and there is no signal at the sync symbol position in the downlink direction Send sync symbols on.

Still further, the synchronization symbol in the superframe of the O-P-SILENT signal or O-P-PILOT signal sent by the signal transceiver 802 on the (M+1)th line is synchronized with the synchronization symbols in the superframe on other lines sent.

Furthermore, the signal transceiver 802 receives the superframe of the R-P-QUIET signal sent by the (M+1)th CPE, wherein the data symbols and synchronization data symbols in the uplink direction in the superframe of the R-P-QUIET signal None of the symbol positions carry signals.

Further, the network side device 800 _also includes a downlink transmission channel processing unit 806, and the downlink transmission channel processing unit 806 calculates the (M+ 1) The transmission channel of the line in the downlink direction. Specifically, after obtaining the H _JS information fed back by the (M+1)th CPE, the downlink transmission channel processing unit 806 combines the obtained H _SS and H _SJ in the downlink direction to calculate the Describe the transmission channels of the entire (M+1) lines in the downlink direction.

Furthermore, the network side device 800 also includes an offset acquisition unit 808, the offset acquisition unit 808 measures the uplink on the Mth line when receiving the superframe of the R-P-SILENT signal The synchronization symbol and the offset of the M uplink synchronization symbols, and send the offset to the (M+1)th CPE through the signal transceiver 802 . Specifically, it can be notified through a short message.

It should be further explained that the specific actions performed by the signal transceiver 802, the uplink transmission channel processing unit 804, and the downlink transmission channel processing unit 806 in the network side device are the methods in the above method embodiments, and the specific steps are not repeated here. repeat.

The embodiment of the present invention also provides a user-side device 900, the user-side device is connected to the CO through the (M+1)th line, and the (M+1)th line is connected to the other M Lines form crosstalk, as shown in Figure 9, including a signal transceiver 902, a downlink transmission channel calculation unit 904;

The signal transceiver 902 receives the superframe of the OP-SILENT signal or OP-PILOT signal sent by the CO, wherein there is no signal at the position of the data symbol in the downlink direction in the superframe of the OP-SILENT signal or OP-PILOT signal, The sync symbol position in the downlink direction carries a sync symbol; and according to the sync symbol information at the sync symbol position in the downlink direction, calculate the (M+1)th line pair in the showtime stage in the downlink direction The crosstalk channel of the M lines, namely H _JS ;

The signal transceiver 902 sends a superframe of the R-P-SILENT signal to the CO, wherein the superframe of the R-P-SILENT signal does not have any signal in the position of the data symbol in the uplink direction, and carries a signal in the position of the sync symbol in the uplink direction Synchronization symbol; the synchronization symbol information on the synchronization symbol position in the uplink direction is used to calculate the transmission channel on the entire (M+1) lines in the uplink direction; the transmission channel on the entire (M+1) lines in the uplink direction The transmission channel is used to eliminate crosstalk between the entire (M+1) lines during data transmission in the uplink direction;

The signal transceiver 902 sends the superframe of the R-ERROR-SAMPLE signal to the CO, wherein the superframe of the R-ERROR-SAMPLE signal carries data information at the position of the data symbol in the uplink direction, and the data information It includes the crosstalk channel between the M lines in the showtime stage in the downlink direction and the (M+1)th line, that is, H _JS . The H _JS information is used by the CO to calculate transmission channels of the (M+1) lines in the downlink direction.

Furthermore, all the superframes constructed during the period when the signal transceiver 902 sends the R-P-SILENT signal do not have any signal at the position of the data symbol in the uplink direction, and the position of the sync symbol in the uplink direction carries a sync symbol;

Further, the signal transceiver 902 sends the superframe of the R-P-QUIET signal to the CO before sending the superframe of the R-P-SILENT signal, but the data symbols in the uplink direction in the superframe of the R-P-QUIET signal No signal is sent at and sync symbol positions;

Still further, all superframes constructed during the period when the signal transceiver 902 sends the R-ERROR-SAMPLE signal carry data information at the data symbol position in the uplink direction.

Furthermore, the user-side equipment 900 also includes an offset acquisition unit 906, the offset acquisition unit 906 receives the synchronization symbol offset carried by the CO through the short message, and according to the synchronization symbol offset, Move the sending position of the synchronization symbol in the superframe of the R-P-SILENT signal, so that the synchronization symbol on the (M+1)th line and the synchronization symbols on other M lines in the showtime stage reach the CO at the same time.

It should be further explained that the specific actions performed by the signal transceiver 902 and the downlink transmission channel calculation unit 904 in the user-side device are the methods in the above method embodiments, and the specific steps will not be repeated here.

The embodiment of the present invention also provides a network system 1000. The system includes a network side device 1001 and multiple user side devices 1003. The network side device 1001 is connected to multiple user side devices through multiple lines 1005, such as N Lines, among which M lines have entered the showtime stage, 1<M<N.

The network side device 1001 is the network side device 800 in the above embodiment, and the user side device 1002 is the user side device 900 in the above embodiment.

It should be further explained that the specific actions performed by the network-side device 1001 and the user-side device 1003 are the methods in the above method embodiments, and the specific steps will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes. Specifically, the network processing procedures described above may be implemented on general-purpose components such as computers or network components having sufficient processing power, memory resources, and network throughput capabilities. Fig. 11 schematically represents an electrical general network component 1100 suitable for implementing one or more embodiments of the components disclosed herein. The network element 1100 includes a processor 1102 (which may be referred to as a central processing unit or CPU), which communicates with a second memory 1104, a read only memory (ROM) 1106, a random access memory (RAM) 1108, an input/ Output (I/O) devices 1110 communicate with memory devices, including network connectivity devices 1112 . The processor 1102 may be implemented as one or more CPU chips, or as part of one or more application specific integrated circuits.

This secondary storage 1104 is typically comprised of one or more disk drives or disk drives and is used for non-volatile storage of data and as an overflow data storage device if RAM 1108 is not large enough to hold all working data. Secondary storage 1104 may be used to store programs that are loaded into RAM 1108 when selected for execution. ROM 1106 is used to store instructions and or data that are read during program execution. ROM 1106 is a non-volatile memory device that typically has a smaller memory capacity relative to the larger memory capacity of secondary memory 1104 . RAM 1108 is used to store volatile data and possibly instructions. Access to ROM 1106 and RAM 1108 is generally faster than access to secondary memory 1104 .

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (21)

1. a circuit initial method, is characterized in that, described method comprises:

User side equipment CPE receives the reticent O-P-SILENT signal of local side transceiver of network equipment CO transmission or the superframe of local side Transceiver Transmit guiding O-P-PILOT signal, the superframe of wherein said O-P-SILENT signal or O-P-PILOT signal does not have signal in the data symbol positions of down direction, and on the synchronizing symbol position of down direction, carry synchronizing symbol; The synchronizing symbol information that the synchronizing symbol position of described down direction carries calculates All other routes to described CPE place circuit crosstalk channels in the downstream direction for described CPE, i.e. H _jS; Described All other routes are the circuit that other CPE are connected with described CO;

Described CPE sends the superframe of the reticent R-P-SILENT signal of remote transceiver to described CO, the superframe of wherein said R-P-SILENT signal without any signal, and the synchronizing symbol position of up direction carries synchronizing symbol in the data symbol positions of up direction; Synchronizing symbol information on the synchronizing symbol position of described up direction is for calculating the transmission channel on up direction on all circuits; The crosstalk that transmission channel on described up direction on all circuits produces when described CO to eliminate on all circuits in up direction transfer of data;

Described CPE sends the superframe of remote transceiver feedback error pattern R-ERROR-SAMPLE signal to described CO, and superframe carry data information in the data symbol positions of up direction of wherein said R-ERROR-SAMPLE signal, described data message comprises described H _jS.

2. the method for claim 1, it is characterized in that, described CPE sends all superframes of building in the stage of R-P-SILENT signal without any signal in the data symbol positions of up direction, and carries synchronizing symbol on the synchronizing symbol position of up direction.

3. method as claimed in claim 2, it is characterized in that, before the superframe sending R-P-SILENT signal, described CPE sends the superframe of the quiet R-P-QUIET signal of remote transceiver to described CO, but the stage interior all superframes built that described CPE sends R-P-QUIET signal do not send signal on the data symbol and synchronizing symbol position of up direction.

4. the method as described in claim 1,2 or 3, is characterized in that, described CPE sends all superframes carry data information in the data symbol positions of up direction built in the stage of R-ERROR-SAMPLE signal.

5. method as claimed in claim 4, it is characterized in that, described CPE receives the synchronizing symbol side-play amount that CO is carried by short message, according to described synchronizing symbol side-play amount, the transmission position of the synchronizing symbol in the superframe of mobile R-P-SILENT signal, make described CPE synchronizing symbol on synchronizing symbol on the line and All other routes reach CO simultaneously.

6. a circuit initial method, described circuit is many circuits that network equipment CO is connected with multiple user side equipment CPE, and (M+1) article circuit that wherein (M+1) individual CPE is corresponding and other M articles of circuits form crosstalk, M >=1; It is characterized in that, described method comprises:

Described CO sends the reticent O-P-SILENT signal of local side transceiver or local side Transceiver Transmit and guides the superframe of O-P-PILOT signal to described (M+1) individual CPE corresponding to described (M+1) article circuit, the superframe of wherein said O-P-SILENT signal or O-P-PILOT signal does not have signal in the data symbol positions of down direction, and on the synchronizing symbol position of down direction, carry synchronizing symbol; Synchronizing symbol information on the synchronizing symbol position of described down direction be used for calculating in the downstream direction described M article circuit to the crosstalk channels of described (M+1) article circuit, i.e. H _jS;

Described CO receives the superframe of the reticent R-P-SILENT signal of remote transceiver that described (M+1) individual CPE sends, the superframe of wherein said R-P-SILENT signal without any signal, and the synchronizing symbol position of up direction carries synchronizing symbol in the data symbol positions of up direction; Described CO calculates the transmission channel on up direction on whole (M+1) bar circuit according to the synchronizing symbol information of the superframe of the described R-P-SILENT signal received on synchronizing symbol position, the crosstalk that the transmission channel on described up direction on (M+1) bar circuit produces when described CO eliminates the transfer of data at up direction on all (M+1) bar circuits;

Described CO receives the superframe of the remote transceiver feedback error pattern R-ERROR-SAMPLE signal that (M+1) individual CPE sends, superframe carry data information in the data symbol positions of up direction of wherein said R-ERROR-SAMPLE signal, described data message comprises described H _jS.

7. method as claimed in claim 6, it is characterized in that, described method comprises further, and described CO is according to the H of described (M+1) individual CPE feedback _jSinformation, calculates described (M+1) bar circuit transmission channel in the downstream direction.

8. method as claimed in claims 6 or 7, it is characterized in that, described CO sends the stage of O-P-SILENT signal or sends all superframes built in the stage of O-P-PILOT signal, the data symbol positions of down direction does not have signal, and send synchronizing symbol on the synchronizing symbol position of down direction.

9. method as claimed in claim 8, it is characterized in that, the synchronizing symbol on the synchronizing symbol in the superframe of the O-P-SILENT signal that described CO sends on (M+1) article circuit or O-P-PILOT signal and All other routes in superframe sends simultaneously.

10. method as claimed in claim 8, it is characterized in that, when described CO receives the superframe of the R-P-SILENT signal that described (M+1) individual CPE sends, described CO measures the uplink synchronous symbol offset amount of uplink synchronous symbol on described M article of circuit and described M article and sends to described (M+1) individual CPE.

11. 1 kinds of network equipments 800, described network equipment 800 is at least connected with (M+1) individual CPE by (M+1) article circuit; Described (M+1) article circuit and other M articles of circuits form crosstalk, and it is characterized in that, described network equipment 800 comprises signal transceiver 802 and uplink transport channel processing unit 804;

Described signal transceiver 802 sends the reticent O-P-SILENT signal of local side transceiver or local side Transceiver Transmit guides the superframe of O-P-PILOT signal to described (M+1) individual CPE, the superframe of wherein said O-P-SILENT signal or O-P-PILOT signal does not have signal in the data symbol positions of down direction, and on the synchronizing symbol position of down direction, carry synchronizing symbol;

Described signal transceiver 802 receives the superframe of the reticent R-P-SILENT signal of remote transceiver that described (M+1) individual user side equipment CPE sends, the superframe of wherein said R-P-SILENT signal without any signal, and the synchronizing symbol position of up direction carries synchronizing symbol in the data symbol positions of up direction;

Described uplink transport channel processing unit 804 calculates the transmission channel on up direction on all circuits according to the synchronizing symbol information in the superframe of the described R-P-SILENT signal received on synchronizing symbol position, and eliminates the crosstalk that all (M+1) bar circuits produce when the transfer of data of up direction according to the transmission channel on (M+1) bar circuit on the described up direction calculated;

Described signal transceiver 802 receives the superframe of the remote transceiver feedback error pattern R-ERROR-SAMPLE signal that (M+1) individual CPE sends, in the superframe of wherein said R-ERROR-SAMPLE signal in the data symbol positions of up direction carry data information, described data message comprises described M article of circuit of down direction to the crosstalk channels of (M+1) article circuit, i.e. H _jS.

12. network equipments 800 as claimed in claim 11, it is characterized in that, described network equipment 800 also comprises descending transmission channel processing unit 806, and described descending transmission channel processing unit 806 is according to the H of described (M+1) individual CPE feedback _jSinformation, calculates described (M+1) bar circuit transmission channel in the downstream direction.

13. network equipments 800 as described in claim 11 or 12, it is characterized in that, described signal transceiver 802 sends the stage of O-P-SILENT signal or sends all superframes built in the stage of O-P-PILOT signal, the data symbol positions of down direction does not have signal, and send synchronizing symbol on the synchronizing symbol position of down direction.

14. network equipments 800 as claimed in claim 13, it is characterized in that, the synchronizing symbol on the synchronizing symbol in the superframe of the O-P-SILENT signal that described signal transceiver 802 sends on (M+1) article circuit or O-P-PILOT signal and All other routes in superframe sends simultaneously.

15. network equipments 800 as claimed in claim 13, it is characterized in that, described network equipment 800 also comprises side-play amount acquiring unit 808, described side-play amount acquiring unit 808 is when receiving the superframe of R-P-SILENT signal, calculate the uplink synchronous symbol on this (M+1) article circuit and the uplink synchronous symbol offset amount on M article of circuit described in other, and this side-play amount is sent to described (M+1) individual CPE by described signal transceiver 802.

16. 1 kinds of user side equipments 900, described user side equipment is connected with network equipment CO by (M+1) article circuit, described (M+1) article circuit and other M article circuit be connected with described CO form crosstalk, it is characterized in that, described user side equipment 900 comprises signal transceiver 902 and descending transmission channel computing unit 904;

Described signal transceiver 902 receives the reticent O-P-SILENT signal of local side transceiver of CO transmission or the superframe of local side Transceiver Transmit guiding O-P-PILOT signal, in the data symbol positions of down direction, there is no signal in the superframe of wherein said O-P-SILENT signal or O-P-PILOT signal, and on the synchronizing symbol position of down direction, carry synchronizing symbol; Described descending transmission channel computing unit 904 according to the synchronizing symbol information on the synchronizing symbol position of described down direction, calculate in the downstream direction described (M+1) article circuit to the crosstalk channels of described M article circuit, i.e. H _jS;

Described signal transceiver 902 sends the superframe of the reticent R-P-SILENT signal of remote transceiver to described CO, the superframe of wherein said R-P-SILENT signal without any signal, and the synchronizing symbol position of up direction carries synchronizing symbol in the data symbol positions of up direction; Synchronizing symbol information on the synchronizing symbol position of described up direction is for calculating the transmission channel on whole on up direction (M+1) bar circuit; Crosstalk when transmission channel on whole on described up direction (M+1) bar circuit is for eliminating transfer of data in the upstream direction between whole (M+1) bar circuit;

Described signal transceiver 902 sends the superframe of remote transceiver feedback error pattern R-ERROR-SAMPLE signal to described CO, in the superframe of wherein said R-ERROR-SAMPLE signal in the data symbol positions of up direction carry data information, described data message comprises described H _jS.

17. user side equipments 900 as claimed in claim 16, it is characterized in that, the all superframes built in the stage that described signal transceiver 902 sends R-P-SILENT signal without any signal, and the synchronizing symbol position of up direction carry synchronizing symbol in the data symbol positions of up direction.

18. user side equipments 900 as described in claim 16 or 17, it is characterized in that, described signal transceiver 902 is before the superframe sending R-P-SILENT signal, send the superframe of the quiet R-P-QUIET signal of remote transceiver to described CO, but on the data symbol of up direction and synchronizing symbol position, do not send signal in the superframe of described R-P-QUIET signal.

19. user side equipments 900 as claimed in claim 18, is characterized in that, described signal transceiver 902 sends all superframes carry data information in the data symbol positions of up direction built in the stage of R-ERROR-SAMPLE signal.

20. user side equipments 900 as claimed in claim 18, it is characterized in that, described user side equipment 900 also comprises side-play amount acquiring unit 906, described side-play amount acquiring unit 906 receives the synchronizing symbol side-play amount that CO is carried by short message, according to described synchronizing symbol side-play amount, the transmission position of the synchronizing symbol in the superframe of mobile R-P-SILENT signal, makes synchronizing symbol on (M+1) article circuit reach CO with the synchronizing symbol on M article of circuit described in other simultaneously.

21. 1 kinds of network systems 1000, it is characterized in that, described system comprises network equipment 800 as claimed in claim 11 and multiple user side equipment as claimed in claim 16 900, and described network equipment 800 is connected with described multiple user side equipment 900 respectively by many circuits 1005.