WO2014161211A1 - Procédé de modulation de sonde, procédé de rétroaction d'erreur, et dispositif et système correspondants - Google Patents

Procédé de modulation de sonde, procédé de rétroaction d'erreur, et dispositif et système correspondants Download PDF

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Publication number
WO2014161211A1
WO2014161211A1 PCT/CN2013/074783 CN2013074783W WO2014161211A1 WO 2014161211 A1 WO2014161211 A1 WO 2014161211A1 CN 2013074783 W CN2013074783 W CN 2013074783W WO 2014161211 A1 WO2014161211 A1 WO 2014161211A1
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Prior art keywords
side device
detection
superframes
equal
network side
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PCT/CN2013/074783
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English (en)
Chinese (zh)
Inventor
王祥
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华为技术有限公司
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Priority to CN201380002193.8A priority Critical patent/CN104247358B/zh
Publication of WO2014161211A1 publication Critical patent/WO2014161211A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/32—Reducing cross-talk, e.g. by compensating

Definitions

  • the present invention belongs to the field of communications, and relates to a DSLAM (DSL Access Multiplexer) system for providing multi-channel xDSL (Digital Subscriber Line) access, and particularly relates to a method for eliminating a DSLAM system.
  • DSLAM DSL Access Multiplexer
  • xDSL is a technology for transmitting data at high speed on Unshielded Twist Pair (UTP).
  • DSL Unshielded Twist Pair
  • the passband transmission xDSL adopts frequency division multiplexing technology.
  • POTS Pelt Old Telephone Service
  • xDSL for passband transmission uses DMT (Discrete Multi-Tone, Discrete Multi-Tone Modulation).
  • Figure 1 shows the structure of a DMT superframe (Superf me).
  • one DMT superframe includes 256 data frames and one probe symbol.
  • the probe symbol is mainly used for the sounding channel, which corresponds to the sync frame (sync f me) in the standard G.993.2 and G.993.5.
  • FIG. 2 shows the system reference model of the DSLAM, where: xTU represents the xDSL transceiver unit; xTU-0 represents the xTU on the ONU (Optical Network Unit), ie the operator side of the loop, which can be the center Network side equipment such as office, switch, and machine rejection; xTU-R indicates the xTU of the remote end, that is, the user end of the loop, which can be used for home modems. User side equipment such as demodulator) and wireless router.
  • xTU represents the xDSL transceiver unit
  • xTU-0 represents the xTU on the ONU (Optical Network Unit), ie the operator side of the loop, which can be the center Network side equipment such as office, switch, and machine rejection
  • xTU-R indicates the xTU of the remote end, that is, the user end of the loop, which can be used for home modems.
  • User side equipment such as demodulator
  • wireless router such as Wi-Fi
  • Crosstalk interference occurs between multiple signals connected to the DSLAM.
  • Crosstalk interference includes Near End Cross-Talk (NEXT) as shown in Figure 3a and Far End Cross-Talk (FEXT) as shown in Figure 3b.
  • NXT Near End Cross-Talk
  • FXT Far End Cross-Talk
  • near-end crosstalk usually does not cause too much harm to system performance.
  • far-end crosstalk is increasingly affecting the transmission performance of the line and reducing the channel rate. For example, when multiple users in a bundle of cables are required to open xDSL services, the far-end crosstalk will cause some line rates to be low, performance is unstable, or even impossible to open, which ultimately results in a lower DSLAM outgoing rate.
  • the shared channel H shown in Figures 4a and 4b can be represented as a matrix on the kth subcarrier of the frequency domain:
  • [08] is the transfer equation from line pair to line pair ''.
  • the number of channels equal to each other and equal to the mutual crosstalk relationship in the shared channel H is set to M here, and then H is a channel transmission matrix.
  • X be a channel input vector of Mx l
  • ⁇ is a channel output vector
  • n is a noise vector of Mx l.
  • the signal received by the xTU-R terminal is:
  • the vectorization technique can eliminate far-end crosstalk.
  • the industry in order to be able to eliminate far-end crosstalk using vectorization techniques, the industry generally adopts the following method to obtain crosstalk cancellation coefficients.
  • the VCE (Vectoring Control Entity) of the DSLAM side first assigns a probe sequence to each xTU-0 port according to certain rules.
  • the probe sequence is used to modulate the probe symbol, consisting of a series of 0, 1 bits, where each a bit constitutes a probe element, and the probe element will be modulated on a probe symbol, when a is equal to At 1 o'clock each bit constitutes a probe element.
  • the sounding sequence is a Pilot Sequence.
  • the sounding symbol is a Sync Symbol, and a is equal to 1, that is, each bit is modulated by all the detectors of one sync symbol.
  • On the carrier Probe Tone).
  • the method of obtaining the crosstalk 4 cancellation coefficient is continued by taking each bit as a detection element as an example.
  • Each xTU-0 port sequentially and cyclically modulates each of the sounding elements in the sounding sequence on the sounding symbols in the DMT superframe as shown in FIG. 1, and transmits a DMT superframe containing the modulated sounding symbols.
  • the xTU-R measures the modulated probe symbols received over the channel relative to the desired result (eg, via an ideal distortion-free channel)
  • the error of the result of the input, and the measured error is expressed as error data in a predetermined format and fed back to VCE via xTU-0.
  • the VCE calculates a crosstalk cancellation coefficient based on the received error data.
  • each xTU-0 port sequentially modulates each of the sounding elements in the sounding sequence on the sounding symbols. This makes it impossible for the error feedback to follow the operational timing of the probing modulation if the amount of error data required to represent the error measured on one of the detected symbols exceeds the amount of the upstream message data of one superframe.
  • the xTU-R discard a portion of the error measured for the probe symbols received during the uplink feedback error data, so that the error feedback can follow the probe modulation; or choose to increase the xTU-R
  • the buffer is used to store all the error data that needs uplink feedback and send it gradually. Obviously, the former option will reduce the error accuracy, while the latter option will increase the resource consumption. Summary of the invention
  • the technical problem to be solved by the present invention is how to perform the detection modulation and the error feedback in an orderly manner, so as to be able to economically and accurately utilize the vectorization technique to eliminate the far-end crosstalk of the channel.
  • a probe modulation method is provided, which is applicable to a system including a network side device and a user side device, and includes: the network side device receiving a sounding sequence; The network side device modulates each of the sounding elements in the sounding sequence, and each of the sounding elements is modulated on a downlink sounding symbol of consecutive M superframes.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, a is an integer greater than or equal to 1, and M is an integer greater than or equal to N, where N represents the user side.
  • the device uplinks the number of superframes required to measure the error measured on one downlink sounding symbol.
  • the network side device modulates each of the sounding elements in the sounding sequence, and each of the sounding elements is modulated in consecutive M superframes. The operation on the downlink probe symbol is repeated at least once.
  • the network side device modulates each of the sounding elements in the sounding sequence, and each of the sounding elements is modulated in consecutive M superframes.
  • the superframe modulated by the network side device is the same as the superframe modulated by other network side devices in the DSLAM system at the same time.
  • the network side device further includes: a downlink fixed symbol of the kth superframe in each of the consecutive M superframes has a structure fixed manner.
  • k is an integer greater than or equal to 1 and less than or equal to M.
  • the network side device receives the value of the M sent by the vectorization control entity VCE, and notifies the user of the value of the M. Side equipment.
  • a network side device which is applicable to a system including the network side device and a user side device, and includes: a communication interface, The user side device communicates through a superframe; a memory for storing programs and/or data; and a processor, connected to the communication interface and the memory, for running the program, so that the network side device The above detection modulation method is performed.
  • a network side device which is applicable to a system including the network side device and a user side device, and includes: 10 units for receiving detection a modulation unit coupled to the 10 unit and the communication unit for modulating each of the sounding elements in the sounding sequence, and each of the sounding elements being modulated in consecutive M superframes And a communication unit configured to communicate with the user side device by using a superframe.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, a is an integer greater than or equal to 1, and M is an integer greater than or equal to N, where N represents the user side.
  • the device uplinks the number of superframes required to measure the error measured on one downlink sounding symbol.
  • the network side device further includes a loop unit connected to the modulation unit, where the loop unit is configured to cause the modulation unit to repeat each probe element in the sounding sequence Modulation is performed, and each of the sounding elements modulates the operation on the downlink sounding symbols of successive M superframes at least once.
  • the network side device further includes a synchronization unit connected to the modulation unit, where the synchronization unit is configured to perform, on the detection unit, each detection element in the detection sequence. Modulation, and each of the sounding elements are modulated in the operation of the downlink sounding symbols of successive M superframes, such that the superframe modulated by the modulation unit is identical to the superframe modulated by other network side devices at the same time.
  • the network side device further includes a marking unit connected to the modulating unit, where the marking unit is configured to make a kth superframe of each of the consecutive M superframes
  • the downlink sounding symbols have a structurally fixed pattern.
  • k is an integer greater than or equal to 1 and less than or equal to M.
  • the 10 unit is further configured to receive a value of the M sent by the VCE, and the communication unit is further configured to notify the value of the M User side device.
  • a network side device which is applicable to a system including the network side device and a user side device, and includes: a communication interface, The user side device communicates through a superframe; the 10 interface is configured to receive a sounding sequence; and the processor is connected to the 10 interface, configured to modulate each of the sounding elements in the sounding sequence, and each The detection elements are all modulated on the downlink detection symbols of successive M superframes.
  • the probe sequence includes a string of 0, 1 bits, and each a bit constitutes one probe element, a is an integer greater than or equal to 1; M is an integer greater than or equal to N; N indicates that the user side device uplink feedback is The number of superframes required for the error measured on one downlink sounding symbol.
  • the processor is further configured to repeatedly modulate each of the sounding elements in the sounding sequence, and each of the detecting elements is modulated in consecutive M
  • the operation on the downlink probe symbol of the superframe is at least once.
  • the processor is further configured to modulate each of the detecting elements in the sounding sequence, and each of the detecting elements is modulated in consecutive M
  • the superframe modulated by the processor is made the same as the superframe modulated by other network side devices at the same time.
  • the processor is further configured to enable a downlink detection symbol of the kth superframe in each of the consecutive M superframes to have a fixed structure.
  • k is an integer greater than or equal to 1 and less than or equal to M.
  • the 10 interface is further configured to receive a value of the M sent by the VCE, and the communication interface is further configured to notify the value of the M User side device.
  • an error feedback method is provided, which is applicable to a system including a network side device and a user side device, and includes: the user side device calculates in a continuous M a statistical average of the errors measured on the downlink sounding symbols of the L superframes in the superframes; and the user side equipment using the uplink symbol feedback of the uplink time duration of the consecutive C superframes to represent the statistical average error data .
  • the downlink sounding symbols of the consecutive M superframes are modulated by the network side device with the same detecting element in the sounding sequence; the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes 1 Probe elements, a is greater than or An integer equal to 1; L is an integer greater than or equal to 1 and less than or equal to M; C is an integer greater than or equal to N and less than or equal to M; M is an integer greater than or equal to N, and N is the uplink of the user equipment The number of superframes required to feed back the error measured on one downlink sounding symbol.
  • the method further includes: the user side device positioning the consecutive M superframes according to a superframe in which the downlink sounding symbol has a fixed structure.
  • the method further includes: the user side device receiving the value of the M notified by the network side device, and determining, according to the value of the M and the value of the N itself Or update the value of C and/or L.
  • the value of the self N refers to a value of N calculated by the user side device based on a superframe structure parameter and an error feedback parameter of a channel accessed by the user side device.
  • a user side device which is applicable to a system including a network side device and the user side device, and includes: a communication interface, The network side device communicates through a superframe; a memory for storing programs and/or data; and a processor, connected to the communication interface and the memory, for running the program, so that the user side device Perform the above error feedback method.
  • a user side device which is applicable to a system including a network side device and the user side device, and includes: a communication unit, The network side device communicates through a superframe; the computing unit is connected to the communication unit, and is configured to calculate a statistical average of errors measured on downlink detection symbols of L superframes in consecutive M superframes; And carrying the unit, connected to the computing unit and the communication unit, for carrying the error data representing the statistical average by using an uplink symbol that occupies a maximum uplink duration of consecutive C superframes.
  • the downlink sounding symbols of the consecutive M superframes are modulated by the network side device with the same detecting element in the sounding sequence;
  • the sounding sequence includes a string of 0, 1 a bit, and each a bit constitutes one probe element, a is an integer greater than or equal to 1;
  • L is an integer greater than or equal to 1 and less than or equal to M;
  • C is an integer greater than or equal to N and less than or equal to M;
  • M is an integer greater than or equal to N, where N represents the number of superframes required by the user side device to feed back the error measured on one downlink sounding symbol.
  • the method further includes a positioning unit connected to the communication unit and the computing unit, where the positioning unit is configured to have a structure-fixed superframe according to the downlink detection symbol. To locate the consecutive M superframes.
  • the method further includes a setting unit connected to the communication unit, the calculating unit, and the offloading unit, where the communication unit is further configured to receive the network.
  • the value of the M notified by the side device, and the setting unit is configured to determine or update the value of the C and/or the L based on the value of the M and the value of the self N.
  • the value of the self N is a value of N calculated by the setting unit based on a superframe structure parameter and an error feedback parameter of a channel accessed by the user side device itself.
  • a user side device which is applicable to a system including a network side device and the user side device, and includes: a communication interface, for The network side device communicates through a superframe; and a processor, connected to the communication interface, configured to calculate a statistical average of errors measured on downlink detection symbols of L superframes in consecutive M superframes, and utilize Uplink symbols occupying at most the uplink duration of consecutive C superframes carry error data representing the statistical average.
  • the downlink sounding symbols of the consecutive M superframes are modulated by the network side device with the same detecting element in the sounding sequence;
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes 1 a detection element, a is an integer greater than or equal to 1;
  • L is an integer greater than or equal to 1 and less than or equal to M;
  • C is an integer greater than or equal to N and less than or equal to M;
  • M is an integer greater than or equal to N, N means said
  • the user side device uplinks the number of superframes required for the error measured on one downlink sounding symbol.
  • the processor is further configured to locate the consecutive M superframes according to a superframe in which the downlink sounding symbols have a fixed structure.
  • the communication interface is further configured to receive a value of the M notified by the network side device, and the processor is further configured to use a value based on the M
  • the value of C and/or L is determined or updated with the value of N itself.
  • the value of the self N is a value of N calculated by the processor based on a superframe structure parameter and an error feedback parameter of a channel accessed by the user side device itself.
  • a crosstalk cancellation coefficient acquisition method is provided, which is applicable to a DSLAM system including a VCE, a network side device, and a user side device, and includes: the VCE Allocating a sounding sequence to the network side device; the VCE calculates a value of N based on a superframe structure parameter and an error feedback parameter of each channel in the DSLAM system, and determines a value of M based on the value of the N, and The value of M is notified to the network side device; and the VCE receives, from the network side device, error data that is up to the uplink symbol of the continuous C frames by the uplink time length, and The error data of the uplink symbol feedback of the superframe uplink duration is combined into error data corresponding to one downlink sounding symbol, and the crosstalk cancellation coefficient is calculated based on the combined error data.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, a is an integer greater than or equal to 1; C is an integer greater than or equal to N and less than or equal to M;
  • the user side device uplinks the number of super frames required for the error measured on the downlink sounding symbols of one super frame; M indicates that the downlink sounding symbol is detected by the network side device in the same detection sequence.
  • the number of consecutive superframes modulated by elements, M being an integer greater than or equal to N.
  • the superframe structure parameters include: The number of frames included in the superframe, the number of uplink symbols included in each of the frames, and the number of bits of message data that each of the uplink symbols can carry.
  • the superframe structure parameters include: The number of symbols included in the superframe, and the number of bits of the uplink data that each of the symbols can carry.
  • the error feedback parameter includes: a required number of bits required for message encapsulation of the uplink feedback error data; each of the downlinks Detecting the number of vectorized frequency bands required by the symbol to be required for feedback error; the number of subcarriers required for each of the vectorized frequency bands that require feedback error; and representing the subcarriers on each of the feedback errors required The number of bits required to measure the error.
  • the method further includes: the VCE monitoring a change of a channel in the DSLAM system, and detecting, when detecting or deleting a channel in the DSLAM system, Recalculating the value of the N based on the superframe structure parameters and the error feedback parameters of the current channels in the DSLAM system, and redetermining the value of the M based on the value of the N.
  • a VCE is provided, which is applicable to a DSLAM system including the VCE, a network side device, and a user side device, and includes: 10 interfaces, for The network side device is connected; a memory for storing programs and/or data; and a processor, connected to the 10 interface and the memory, for running the program, so that the VCE performs the above crosstalk cancellation Coefficient acquisition method.
  • a VCE which is applicable to a DSLAM system including the VCE, a network side device, and a user side device, and includes: 10 units connected to the network side device; and an allocation unit connected to the 10 unit for allocation Detecting a sequence, and transmitting the allocated sounding sequence to the network side device via the 10 unit; a setting unit, connected to the 10 unit, for superframe structure parameters based on each channel in the DSLAM system And the error feedback parameter calculates a value of N, determines a value of M based on the value of the N, and notifies the value of the M to the network side device via the 10 unit; and the computing unit is connected to the 10 unit And combining, by using the 10 units, the error data that is received by the network side device by uplink symbol feedback that occupies at most C superframe uplink time durations into error data corresponding to one downlink sounding symbol, and is based on The combined error data calculates a crosstalk cancellation coefficient.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, a is an integer greater than or equal to 1; C is an integer greater than or equal to N and less than or equal to M;
  • the user side device uplinks the number of super frames required for the error measured on the downlink sounding symbols of one super frame; M indicates that the downlink sounding symbol is detected by the network side device in the same detection sequence.
  • the number of consecutive superframes modulated by the element, M being an integer greater than or equal to N.
  • the VCE further includes a monitoring unit connected to the setting unit, where the monitoring unit is configured to monitor a change of a channel in the DSLAM system; and the setting unit further And when the monitoring unit detects that a new channel is deleted or deleted in the DSLAM system, calculating a value of the N based on a superframe structure parameter and an error feedback parameter of each channel in the DSLAM system, and based on the The value of N re-determines the value of the M.
  • a VCE is provided, which is applicable to a DSLAM system including the VCE, a network side device, and a user side device, and includes: a processor, configured to The network side device allocates a sounding sequence, based on superframe structure parameters and errors of each channel in the DSLAM system
  • the feedback parameter calculates a value of N, and determines a value of M based on the value of the N; and a 10 interface, connected to the processor, to notify the network side device of the sounding sequence and the value of the M And receiving, from the network side device, error data that is fed back by up to a maximum of C consecutive frames of uplink time.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, and a is an integer greater than or equal to 1.
  • the processor is further configured to pass the maximum of C consecutive
  • the error data of the uplink symbol feedback of the superframe uplink duration is combined into error data corresponding to one downlink sounding symbol, and the crosstalk cancellation coefficient is calculated based on the combined error data;
  • C is greater than or equal to N and less than or equal to M
  • An integer of N represents the number of superframes required by the user side device to feed back the error measured on the downlink sounding symbols of one superframe;
  • M represents that the downlink sounding symbol is used by the network side device to the sounding sequence.
  • the number of consecutive superframes modulated by the same probe element, M is an integer greater than or equal to N.
  • the processor is further configured to monitor a change of a channel in the DSLAM system, and when detecting a new channel in the DSLAM system, The superframe structure parameters and error feedback parameters of the current channels in the DSLAM system calculate the value of the N, and the value of the M is re-determined based on the value of the N.
  • the superframe structure parameter includes: each of the superframes included The number of frames, the number of uplink symbols included in each of the frames, and the number of bits of data that can be carried by each of the uplink symbols.
  • the superframe structure parameter includes: each of the superframes The number of symbols included, and the number of bits of the ⁇ data that each of the symbols can carry.
  • the error feedback parameter The method includes: a desired number of bits of message overhead required for message encapsulation of the uplink feedback error data; a number of vectorized frequency bands that each of the downlink sounding symbols includes a feedback error; each of the vectorized frequency bands includes The number of subcarriers that require feedback error; and the number of bits required to represent the error measured on each of the subcarriers that require feedback error.
  • a DSLAM system including: the VCE, at least two network side devices; and at least two user side devices; wherein the VCE The probe sequence is sent to the network side device, and the value of M is sent to the network side device and the user side device.
  • the error feedback it is also possible to cause the error feedback to follow the probe modulation in an orderly manner and to completely feed back the error on the probe symbol corresponding to the entire sounding sequence without increasing the buffer area.
  • FIG. 1 is a schematic structural diagram of a DMT superframe
  • Figure 2 shows a schematic diagram of a system reference model of a DSLAM
  • Figure 3a shows a schematic diagram of the principle of generating near-end crosstalk between multiple signals accessed by the DSLAM
  • FIG. 3b is a schematic diagram showing the principle of generating far-end crosstalk between multiple signals accessed by the DSLAM;
  • Figure 4a shows a schematic diagram of a system architecture for joint reception at the DSLAM end to eliminate far-end crosstalk
  • Figure 4b shows a schematic diagram of a system architecture for joint transmission at the DSLAM end to eliminate far-end crosstalk
  • FIG. 5 is a flowchart showing a sounding modulation method, an error feedback method, and a method for acquiring a crosstalk cancellation coefficient according to an embodiment of the present invention
  • 6a to 6c are diagrams showing a super-frame stream in which error feedback can be sequentially followed by probe modulation by a probe modulation method, an error feedback method, and a crosstalk cancellation coefficient acquisition method according to an embodiment of the present invention
  • FIG. 7 is a flowchart showing a sounding modulation method, an error feedback method, and a method for acquiring a crosstalk cancellation coefficient according to another embodiment of the present invention
  • FIG. 8 is a block diagram showing the structure of a network side device according to an embodiment of the present invention
  • FIG. 9 is a block diagram showing the structure of a network side device according to another embodiment of the present invention
  • FIG. 10 is a block diagram showing a network according to another embodiment of the present invention.
  • FIG. 11 is a block diagram showing the structure of a user side device according to an embodiment of the present invention
  • FIG. 12 is a block diagram showing the structure of a user side device according to another embodiment of the present invention
  • FIG. 14 is a block diagram showing the structure of a VCE according to an embodiment of the present invention.
  • FIG. 15 is a block diagram showing the structure of a VCE according to another embodiment of the present invention.
  • FIG. 16 is a block diagram showing the structure of a VCE according to still another embodiment of the present invention
  • FIG. Figure 17 is a diagram showing packet sounding modulation according to an embodiment of the present invention
  • Figure 18 is a diagram showing packet sounding modulation according to another embodiment of the present invention.
  • 19 is a flowchart showing a sounding modulation method, an error feedback method, and a method for acquiring a crosstalk cancellation coefficient according to still another embodiment of the present invention
  • 20a to 20c are diagrams showing a super-frame stream in which error detection can follow the detection modulation in an orderly manner by the probe modulation method, the error feedback method, and the crosstalk cancellation coefficient acquisition method according to still another embodiment of the present invention
  • the method according to this embodiment of the present invention is applicable to a DSLAM system including a VCE, a network side device, and a user side device, and includes:
  • the VCE calculates N based on the superframe structure parameters and error feedback parameters of each channel in the DSLAM system. The value is determined based on the value of N (S5 1 1), and then the value of the M is notified to the network side device.
  • the N indicates the number of superframes required by the user side device to feed back the error measured on the downlink sounding symbols of one super frame.
  • M represents the number of consecutive superframes in which the downlink sounding symbols are modulated by the network side device using the same sounding element in the sounding sequence, and M is an integer greater than or equal to N.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one sounding element, and a is an integer greater than or equal to one.
  • the network side device records the value of the M (S521), and notifies the user side device of the value of the M.
  • the user side device determines the values of C and L based on the received value of the M and the value of its own N (S53 1).
  • the value of the self N is a value of N calculated by the user equipment based on a superframe structure parameter and an error feedback parameter of a channel to which the user equipment is connected.
  • C is an integer greater than or equal to N and less than or equal to M
  • L is an integer greater than or equal to 1 and less than or equal to M.
  • the VCE allocates a sounding sequence to the network side device (S512), and sends the allocated sounding sequence to the network side device.
  • the network side device After receiving the sounding sequence allocated by the VCE, the network side device modulates each detecting element in the sounding sequence, and each of the detecting elements is modulated in consecutive M On the downlink sounding symbol of the superframe (S522), the modulated superframe is sent to the user side device.
  • the downlink detection symbols of the M superframes in which the different detection elements are modulated are different.
  • the network side device performs each detection element in the detection sequence.
  • the user side device calculates a statistical average of errors measured on downlink detection symbols of L superframes in the consecutive M superframes (S532), and utilizes at most C consecutive
  • the uplink symbol feedback of the superframe uplink duration represents the statistical average error data (S533).
  • L when L is equal to 1, the L superframes may be any one of the M superframes. In the case where L is greater than or equal to 2, the L superframes may be a plurality of superframes that are consecutive or intermittent in the M superframes.
  • the uplink symbol that occupies at most the uplink duration of consecutive C superframes may be an uplink symbol of consecutive multiple superframes from the head of a certain superframe, or may be continuous from any intermediate part of a certain superframe.
  • the upstream symbol of multiple superframes may be an uplink symbol of consecutive multiple superframes from the head of a certain superframe, or may be continuous from any intermediate part of a certain superframe.
  • the VCE may pass the maximum C consecutive superframes.
  • the error data of the uplink symbol feedback of the uplink duration is combined into error data corresponding to one downlink probe symbol (S513), and the crosstalk cancellation coefficient (S 514 ) is calculated based on the combined error data.
  • the user side device will terminate the feedback error data and enter the feedback of the next measurement error.
  • Figures 6a to 6c show schematic diagrams of superframe flow for detecting modulation and error feedback by the method shown in Fig. 5. It can be clearly seen that the error is measured on one downlink detection symbol by using the same detection element to modulate consecutive M superframes on the network side device and using the uplink symbol feedback of the uplink time of the continuous C superframes on the user side device. Data, the foregoing method according to an embodiment of the present invention enables the error feedback of the user side device to follow the detection modulation of the network side device in an orderly manner, even if it is required to use multiple super frames for uplink feedback to be measured on one downlink detection symbol. In the case of an error, the crosstalk coefficient of the D SLAM system can also be calculated economically and accurately.
  • step S51 1 is shown in FIG. 5 as being performed before step S512, the present invention is not limited thereto, and those skilled in the art should understand that step S5 11 may also be after step S512 or Step S512 is performed simultaneously.
  • step S5 11 may also be after step S512 or Step S512 is performed simultaneously.
  • each detection element in the detection sequence is Modulation is to be performed to ensure that the user side device feeds back at least an error on all detected symbols corresponding to a complete sounding sequence.
  • the network side device modulates each of the sounding elements in the sounding sequence, and each of the sounding elements is modulated on a downlink sounding symbol of consecutive M superframes.
  • the operation (S522) is repeated at least once.
  • the superframe structure parameter may include: each of the super The number of TTD frames included in the frame, the number of uplink symbols included in each of the frames, and the number of bits of the data that can be carried by each of the uplink symbols.
  • the error feedback parameter may include: a desired number of bits of message overhead required for message encapsulation of the uplink feedback error data; and a number of vectored bands required for each of the downlink sounding symbols to be required for feedback error
  • the first vectorization band includes the number of subcarriers requiring feedback error and the number of bits required to represent the error measured on each of the k-th vectorization bands that require the feedback error.
  • the VCE can calculate the value of the N by using Equation 6 below, where "1" indicates that ⁇ is an integer.
  • a typical superframe contains 8 TDD frames, each TDD frame contains 35 symbols and two guard slots (guard time for separate uplink and downlink, which The length of the two guard time is 1 symbol), assuming each TDD There are 7 uplink symbols in the frame, and each uplink symbol can carry 286 bits of message data.
  • G. fast has nearly 2048 subcarriers per probe symbol when using a 106 MHz profile, assuming an error of 2000 subcarriers on one probe symbol, and assuming 16 bits per error for each subcarrier.
  • the expected message overhead required for each uplink feedback error data is 8 bits. In this case, the VCE will calculate that N is equal to two.
  • the superframe structure parameter may include: The number 6 of symbols included in the superframe, and the number x of bits of uplink message data that each of the symbols can carry.
  • the error feedback parameter may include: canceling the uplink feedback error data, and encapsulating the required number of bits of the overhead, ⁇ ; a vectorized frequency band required by each of the downlink sounding symbols to be required for feedback error (Vectored Bands, the number of subcarriers in the first vectorization band that require feedback error; and the number of bits required to represent the error measured on each of the subcarriers that require feedback error in the first vectorization band 3 ⁇ .
  • the VCE can calculate the value of the N by using Equation 7 below, where " ⁇ " indicates that ⁇ is taken up as an integer.
  • the VCE calculates the value of N by using Equation 6 or Equation 7 above
  • the N value calculated for the channel is used as the entire DSLAM system.
  • N value and in the case where the DSLAM system includes multiple channels, the N value will be calculated for each channel, and the maximum N value is preferably used as the N value of the entire DSLAM system to ensure error feedback for all user side devices.
  • the detection modulation of the network side device is followed sequentially.
  • the expected bit number z of the message overhead required for message encapsulation of the uplink feedback error data refers to canceling the uplink feedback error data, and the encapsulation is an expected value of the message overhead.
  • the expected value may not be the same as the actual cost value.
  • the overhead required for different payloads is different due to octet transparency. In some cases, this expected value can be set to zero.
  • the network side device modulates each of the sounding elements in the sounding sequence, and each of the sounding elements is modulated in a downlink of consecutive M superframes.
  • the superframe modulated by the network side device is the same as the superframe modulated by the other network side devices in the DSLAM system at the same time.
  • the network side device modulates each of the sounding elements in the sounding sequence, and each of the sounding elements is modulated in a downlink of consecutive M superframes.
  • the network side device may cause each of the consecutive M superframes in a predetermined manner, for example, a mode for marking a synchronization symbol in G.993.5
  • the downlink sounding symbols of the kth superframe have a structure fixed pattern. Where k is an integer greater than or equal to 1 and less than or equal to M.
  • the network side device has a structure in which the downlink sounding symbols of a superframe of each of the consecutive M superframes have a fixed structure, so that the user equipment can be configured according to whether the downlink sounding symbols have a fixed structure.
  • FIG. 7 shows a flow chart of a sounding modulation method, an error feedback method, and a crosstalk cancellation coefficient acquisition method according to another embodiment of the present invention.
  • the components in Fig. 7 having the same reference numerals as those in Fig. 5 have the same functions, and the description of these components will be omitted.
  • the values of the N, the M, the C, and the L are not statically changed, but are dynamically changed.
  • the so-called static invariant means that, for example, when the DSLAM system is started, the VCE calculates the value of the N according to the superframe structure parameter and the error feedback parameter of each channel and sets the value of the M, and the user side device is based on The value of M sets the values of C and L, and will thereafter use the set values of M, C, and L for probing modulation, error feedback, and crosstalk cancellation coefficients. Get until the DSLAM system is shut down or restarted.
  • the so-called dynamic change means that the values of N, M, C and L will vary following changes in the channel in the DSLAM system.
  • the VCE monitors a change of a channel in the DSLAM system (S71 1 ), and when it detects the new channel is deleted or deleted in the DSLAM system, is re-based in the DSLAM system.
  • the superframe structure parameters and error feedback parameters of the current channels calculate the value of the N, and the value of the M is re-determined based on the value of the N (S712).
  • the network side device records the value of the M (S521) and notifies the user side device of the value of the M when receiving the value of the M notified by the VCE;
  • the user side device determines or updates the value of the C and/or the L based on the value of the M and the value of the N when receiving the value of the M notified by the network side device ( S73 1).
  • the value of the self N is a value of N calculated by the user side device based on a superframe structure parameter and an error feedback parameter of a channel to which the user side device is connected.
  • FIG. 8 is a block diagram showing the structure of a network side device according to an embodiment of the present invention.
  • the network side device 800 is applicable to a DSLAM system including a VCE, a network side device, and a user side device, and includes 10 units 810, a modulation unit 820, and a communication unit 830.
  • the 10 unit 810 is connected to the VCE and the modulation unit 820, and is mainly used for communicating with the VCE, for example, receiving the sounding sequence allocated by the VCE and transmitting it to the modulation unit 820.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, and a is an integer greater than or equal to 1.
  • Modulation unit 820 is connected to unit 10 810 and communication unit 830, and is mainly used for modulating each of the sounding elements in the sounding sequence, and each of the detecting elements is modulated in the downlink of consecutive M superframes. On the probe symbol.
  • M is an integer greater than or equal to N
  • N represents the number of superframes required by the user side device to feed back the error measured on one downlink sounding symbol.
  • the communication unit 830 is connected to the user side device and the modulation unit 820, and is mainly used for communicating with the user side device by using a superframe, for example, the downlink detection symbol is modulated by the modulation unit 820 by using the detection element to send the super frame to the user side. device.
  • the network side device 800 since the modulating unit 820 modulates the downlink sounding symbols of the consecutive M superframes by the same detecting element, the network side device 800 according to the embodiment of the present invention enables the user side device to utilize up to a total of C supers.
  • the uplink symbol of the uplink time of the frame feeds back the error measured on one probe symbol, thereby ensuring that the error feedback of the user side device follows the sounding modulation of the network side device 800 in an orderly manner, even when multiple super frames are needed for uplink feedback.
  • the crosstalk cancellation coefficient of the DSLAM system can also be calculated economically and accurately.
  • the network side device 800 may further include a loop unit 840.
  • the looping unit 840 is connected to the modulating unit 820, and is mainly used for causing the modulating unit 820 to repeatedly modulate each detecting element in the sounding sequence, and each of the detecting elements modulates a downlink detecting symbol of consecutive M superframes. Up Operate at least once.
  • the crosstalk cancellation coefficients can be continuously calculated or updated using the error feedback obtained multiple times, thereby further improving the accuracy of the crosstalk cancellation coefficients.
  • the network side device 800 may further include a synchronization unit 850.
  • the synchronization unit 850 is connected to the modulation unit 820, and is mainly used to modulate each of the detection elements in the detection sequence by the modulation unit 820, and each of the detection elements is modulated on the downlink detection symbols of consecutive M superframes.
  • the superframe modulated by the modulation unit 820 is the same as the superframe modulated by the other network side devices in the DSLAM system at the same time.
  • the network side device 800 may further include a marking unit 860.
  • the marking unit 860 is connected to the modulating unit 820, and is mainly used to make the kth super in each of the consecutive M superframes in a predetermined manner, for example, a mode for marking a synchronization symbol in G.993.5.
  • the downlink sounding symbols of the frame have a structurally fixed pattern. Where k is an integer greater than or equal to 1 and less than or equal to M.
  • the marking unit 860 has a structure in which the downlink sounding symbols of one of the consecutive M superframes have a fixed structure, the user side device can accurately determine whether the downlink sounding symbol has a structurally fixed pattern.
  • the M superframes continuously modulated by the same detecting element are located, thereby further facilitating the error feedback of the user side device to follow the sounding modulation of the network side device 800 in an orderly manner.
  • the 10th unit further receives the value of the M notified by the VCE, and notifies the modulation unit 820 of the value of the M, and also passes the value of the M to the communication unit. 830 notifies the user side device.
  • the network device 800 may dynamically: Gen notification data VCE updated values of the M and notifies the user-side equipment via the communication unit 830, even if there is a channel system within the new DSLAM Alternatively, the error feedback of the user side device can be ensured to follow the detection modulation of the network side device 800 in an orderly manner, thereby further improving the accuracy of the crosstalk cancellation coefficient.
  • the network side device 900 is applicable to a DSLAM system including a VCE, a network side device, and a user side device, and includes a 10 interface 910, a processor 920, and a communication interface 930.
  • the interface 10 is connected to the VCE and the processor 920, and is mainly used for communicating with the VCE, for example, receiving a probe sequence allocated by the VCE to the network side device 900, and The received sounding sequence is sent to the processor 920.
  • the communication interface 930 is connected to the user side device and the processor 920, and is mainly used for communicating with the user side device through a superframe.
  • the processor 920 is connected to the 10 interface 910 and the communication interface 930, and is mainly configured to modulate each of the sounding elements in the sounding sequence, and each of the detecting elements is modulated in a downlink of consecutive M superframes.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, and a is an integer greater than or equal to 1.
  • M is an integer greater than or equal to N, and N represents the number of superframes required by the user side device to feed back the error measured on one downlink sounding symbol.
  • the network side device 900 since the processor 920 modulates the downlink sounding symbols of the consecutive M superframes by using the same sounding element, the network side device 900 according to the embodiment of the present invention enables the user side device to utilize up to a continuous C super
  • the uplink symbol of the uplink time of the frame feeds back the error measured on one probe symbol, thereby ensuring that the error feedback of the user side device follows the sounding modulation of the network side device 900 in an orderly manner, even when multiple super frames are needed for uplink feedback.
  • the crosstalk cancellation coefficient of the DSLAM system can also be calculated economically and accurately.
  • the processor 920 is further configured to repeatedly modulate each of the sounding elements in the sounding sequence, and each of the sounding elements is modulated The operation on the downlink sounding symbols of successive M superframes is performed at least once.
  • the crosstalk cancellation coefficients can be continuously calculated or updated using the error feedback obtained multiple times, thereby further improving the accuracy of the crosstalk cancellation coefficients.
  • the processor 920 is further configured to modulate each of the sounding elements in the sounding sequence, and each of the sounding elements is modulated in consecutive M superframes.
  • the superframe modulated by the processor 920 is made the same as the superframe modulated by the other network side devices in the DSLAM system at the same time. In this way, since all the lines use the detection elements of the respective sounding sequences to repeatedly modulate the M downlink sounding symbols at the same time, which makes the crosstalk caused by the lines on the M downlink sounding symbols equivalent, thereby ensuring the crosstalk canceling coefficient. Accuracy.
  • the processor 920 is further configured to cause each of the consecutive M supers by a predetermined manner, for example, a mode for marking a synchronization symbol in G.993.5.
  • the downlink sounding symbols of the kth superframe in the frame have a structure fixed pattern. Where k is an integer greater than or equal to 1 and less than or equal to M.
  • the processor 920 has a structure in which the downlink sounding symbols of one of the consecutive M superframes have a fixed structure, so that the user side device can accurately determine whether the downlink sounding symbols have a fixed structure.
  • the M superframes continuously modulated by the same detecting element are located, thereby further facilitating the error feedback of the user side device to follow the detection modulation of the network side device 900 in an orderly manner.
  • the processor 920 is further configured to: when the 10 interface 910 receives the value of the M notified by the VCE, send the value of the M to the User side device.
  • the network side device 900 can dynamically update the value of the M according to the notification of the VCE and notify the user side device via the communication interface 930, even if a channel new or eliminated occurs in the DSLAM system, Ensuring that the error feedback of the user side device follows the network side device 900 in an orderly manner The modulation is detected to further improve the accuracy of the crosstalk cancellation coefficient.
  • FIG. 10 is a block diagram showing the structure of a network side device according to still another embodiment of the present invention.
  • the network side device 1000 may be a host server having a computing capability, a personal computer PC, or a portable computer or terminal that can be carried.
  • the specific embodiment of the present invention does not limit the specific implementation of the computing node.
  • the network side device 1000 includes a processor 1010, a communication interface 1020, 10 (Input and Output) interface 1030, a memory 1040, and a bus 1050.
  • the processor 1010, the communication interface 1020, the 10 interface 1030, and the memory 1040 complete communication with each other through the bus 1050.
  • the communication interface 1020 is for communicating with user side devices in the DSLAM system.
  • [67] 10 interface 1030 is used to communicate with the VCE in the DSLAM system.
  • the memory 1040 is for storing programs and/or data, and the program may be program code including computer operating instructions.
  • the memory 1040 may include a high speed RAM memory, and may also include a non-volatile memory such as at least one disk memory.
  • Memory 1040 can also be a memory array.
  • the memory 1040 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.
  • the processor 1010 is for a program.
  • the processor 1010 may be a central processor
  • Circuit or one or more integrated circuits configured to implement embodiments of the present invention.
  • the processor 1010 causes the network side device 1000 to perform the following operations by executing a program stored in the memory 1040: the network side device receives the probe sequence allocated by the VC E Wherein the sounding sequence is sent by a VCE; and the network side device modulates each of the sounding elements in the sounding sequence, and each of the detecting elements is modulated in a downlink of consecutive M superframes; On the probe symbol.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one probe element, a is an integer greater than or equal to 1; and, M is an integer greater than or equal to N, and N represents an error measured by the user-side device uplink feedback on one downlink probe symbol. The number of superframes required.
  • FIG. 11 is a block diagram showing the structure of a user side device according to an embodiment of the present invention.
  • the user side device 1100 is applicable to a DSLAM system including a VCE, a network side device, and a user side device, and includes a communication unit 1110, a computing unit 1120, and a load sharing unit 1130.
  • the communication unit 1110 is connected to the network side device, the computing unit 1120, and the load sharing unit 1130, and is mainly used to communicate with the network side device through a superframe, for example, continuous receiving downlink.
  • the probe symbols have been M superframes modulated by the network side device with the same probe element in the sounding sequence.
  • the detection sequence includes a string of 0, 1 bits, and each a bit constitutes one detection element, and a is an integer greater than or equal to 1.
  • M is an integer greater than or equal to N, and N represents the number of superframes required by the user side device to feed back the error measured on one downlink sounding symbol.
  • the computing unit 1120 is coupled to the communication unit 1110 and the load sharing unit 1130 and is mainly used to calculate a statistical average of the errors measured on the downlink sounding symbols of the L superframes in successive M superframes.
  • L is an integer greater than or equal to 1 and less than or equal to M.
  • the L superframes may be any one of the M superframes.
  • the L superframes may be consecutive or intermittent superframes in the M superframes.
  • the offloading unit 1130 is connected to the computing unit 1120 and the communication unit 1110, and is mainly used for uplinking the error data indicating the statistical average calculated by the calculating unit 1120 to an uplink symbol that is up to the uplink time of consecutive C superframes. And transmitting the C superframes to the network side device via the communication unit 1110.
  • C is an integer greater than or equal to N and less than or equal to M.
  • the offloading unit 1130 is adapted to use the same network side device
  • the detecting element modulates the continuous M superframes and uses the uplink symbol that occupies the uplink time of the continuous C superframes to feedback the error measured on one detecting symbol, which can effectively ensure that the error feedback of the user side device 1100 follows the said order.
  • the probe modulation of the network side device can calculate the crosstalk cancellation coefficient of the DSLAM system economically and accurately even when it is necessary to use a plurality of superframes to uplink feedback errors measured on one downlink sounding symbol.
  • the user side device 1100 may further include a positioning unit 1140.
  • the positioning unit 1140 is connected to the communication unit 1110 and the computing unit 1120, and is mainly configured to locate the consecutive M superframes according to whether the downlink detection symbols in the superframe received by the communication unit 1110 have a fixed structure, and locate the positioning. The result is communicated to the computing unit 1120.
  • the positioning unit 1140 can accurately locate the M superframes continuously modulated by the same detecting element according to whether the downlink detecting symbols have a fixed structure, it is more helpful to ensure that the error feedback of the user side device 1100 follows the order in an orderly manner. Probing modulation of network side devices.
  • the user side device 1100 may further include a setting unit 1150.
  • the setting unit 1150 is connected to the communication unit 1110, the computing unit 1120, and the offloading unit 1130, and is mainly used to calculate the value of the M when the communication unit 1110 receives the value of the M notified by the network side device.
  • the value of the C and/or L is determined or updated with the value of the own N, and the values of the ⁇ 1, the C, and the L are notified to the computing unit 1120 and the offloading unit 1130.
  • the value of the self N is a value of the N calculated by the specified value unit 1150 based on the superframe structure parameter and the error feedback parameter of the channel accessed by the user side device 1100 itself.
  • the user side device 1100 can dynamically adjust the C and/or the L to an appropriate value according to the value of the M notified by the network side device through the setting unit 1150, even if the DSLAM system The channel is newly created or eliminated, and the error feedback of the user side device 1100 can be ensured to follow the detection modulation of the network side device in an orderly manner, thereby further improving the accuracy of the crosstalk cancellation coefficient.
  • Example 7
  • FIG. 12 is a block diagram showing the structure of a user side device according to another embodiment of the present invention.
  • the user side device 1200 is applicable to a DSLAM system including a VCE, a network side device, and a user side device, and includes a communication interface 1210 and a processor 1220.
  • the communication interface 1210 is connected to the network side device and the processor 1220, and is mainly used for communicating with the network side device through a superframe, for example, continuously receiving downlink detection symbols has been
  • the M superframes modulated by the same detection element in the sounding sequence of the network side device.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, and a is an integer greater than or equal to 1.
  • M is an integer greater than or equal to N, and N represents the number of superframes required by the user side device to feed back the error measured on one downlink sounding symbol.
  • the processor 1220 is connected to the communication interface 1210, and is mainly used for calculating a statistical average of errors measured on downlink detection symbols of L superframes in the consecutive M superframes, and using up to C consecutive
  • the uplink symbol of the superframe uplink duration carries error data representing the statistical average.
  • L is an integer greater than or equal to 1 and less than or equal to M
  • C is an integer greater than or equal to N and less than or equal to M.
  • L superframes may be any one of the M superframes.
  • the L superframes may be consecutive or intermittent superframes in the M superframes.
  • the processor 1220 is adapted to use the same sounding element to modulate consecutive M superframes by the network side device, the uplink symbol feedback that occupies the uplink time of the consecutive C superframes is measured on one detected symbol.
  • the error can effectively ensure that the error feedback of the user side device 1200 follows the sounding modulation of the network side device in an orderly manner, even if multiple super frames are needed to uplink feedback the error measured on one downlink detection symbol.
  • the crosstalk cancellation coefficient of the DSLAM system can also be calculated economically and accurately.
  • the processor 1220 is further configured to perform communication according to Whether the downlink sounding symbols in the superframe received by the port 1210 have a structurally fixed pattern to locate the consecutive M superframes, and inform the computing unit 1 120 of the positioning result. In this way, since the processor 1220 can accurately locate the M superframes continuously modulated by the same detecting element according to whether the downlink detecting symbols have a fixed structure, it is more helpful to ensure that the error feedback of the user side device 1200 follows the order in an orderly manner. Probing modulation of network side devices.
  • the processor 1220 is further configured to: based on the value of the M and the self N, when the communication interface 1210 receives the value of the M notified by the network side device.
  • the value of the value determines or updates the value of C and/or L.
  • the value of the N is the value of the N calculated by the processor 1220 based on the superframe structure parameter and the error feedback parameter of the channel accessed by the user side device 1200 itself.
  • the user side device 1200 can dynamically adjust the C and/or the L to an appropriate value according to the value of the M notified by the network side device by the processor 1220, even within the DSLAM system.
  • the channel creation or elimination occurs, and the error feedback of the user side device 1200 can be ensured to follow the detection modulation of the network side device in an orderly manner, thereby further improving the accuracy of the crosstalk cancellation coefficient.
  • FIG. 13 is a block diagram showing the structure of a user side device according to still another embodiment of the present invention.
  • the user side device 1300 may be a host server having a computing capability, a personal computer PC, or a portable computer or terminal that can be carried.
  • the specific embodiment of the present invention does not limit the specific implementation of the computing node.
  • the user side device 1300 includes a processor 13 10, a communication interface 1320, a memory 1330, and a bus 1340.
  • the processor 13 10, the communication interface 1320, and the memory 1330 complete communication with each other through the bus 1340.
  • the communication interface 1320 is used to communicate with network side devices in the DSLAM system.
  • the memory 1330 is for storing programs and/or data, and the program may be program code including computer operating instructions.
  • the memory 1330 may include a high speed RAM memory, or It can also include a non-volatile memory, such as at least one disk storage. Memory 1330 can also be a memory array.
  • the memory 1330 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.
  • Processor 13 10 is used for the program.
  • Processor 13 10 may be a central processor
  • Circuit or one or more integrated circuits configured to implement embodiments of the present invention.
  • the processor 1310 causes the user side device 1300 to perform the following operations by executing a program stored in the memory 1330: the user side device is calculated in consecutive M superframes. The statistical average of the errors measured on the downlink sounding symbols of the L superframes; and the user side equipment uses the uplink symbol feedback that occupies at most the uplink time length of the C superframes to represent the statistical average error data.
  • the downlink sounding symbols of the consecutive M superframes are modulated by the network side device with the same detecting element in the sounding sequence;
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes 1 a detection element, a is an integer greater than or equal to 1;
  • L is an integer greater than or equal to 1 and less than or equal to M;
  • C is an integer greater than or equal to N and less than or equal to M, and M is greater than or equal to N
  • An integer, N indicates the number of superframes required by the user side device to feed back the error measured on one downlink sounding symbol.
  • FIG. 14 is a block diagram showing the structure of a VCE according to an embodiment of the present invention.
  • the vectoring control entity VCE 1400 is applicable to a DSLAM system including the VCE, the network side device, and the user side device, and includes a 10 unit 1410, an allocating unit 1420, a setting unit 1430, and a calculating unit 1440.
  • the 10 unit 1410 is connected to the network side device and the distribution unit 1420, the setting unit 1430, and the computing unit 1440, and is mainly used for communicating with the network side device.
  • the allocating unit 1420 is connected to the 10 unit 1410, and is mainly used for allocating the sounding sequence, and transmitting the allocated sounding sequence to the network side device via the 10 unit 1410.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, and a is an integer greater than or equal to 1.
  • the setting unit 1430 is connected to the 10 unit 1410, and is mainly configured to calculate a value of N based on a superframe structure parameter and an error feedback parameter of each channel in the DSLAM system, and determine the M based on the value of the N.
  • the value, and the value of the M is notified to the network side device via the 10 unit 1410.
  • N is the number of superframes required by the user side device to feed back the error measured on the downlink sounding symbols of one super frame.
  • M represents the number of consecutive superframes in which the downlink detection symbol is modulated by the network side device to the same detection element in the sounding sequence, and M is an integer greater than or equal to N.
  • the superframe structure parameter may include: a TTD frame included in each of the superframes The number ", the number of uplink symbols included in each of the frames, and the number of bits X of message data that each of the uplink symbols can carry.
  • the error feedback parameter may include: canceling an uplink feedback error, and consuming a required number of bits of the overhead, and consuming a vectorized band of each of the downlink sounding symbols that requires a feedback error.
  • the setting unit 1430 can calculate the value of the N using Equation 6 above.
  • the superframe structure parameter may include: each of the superframes included The number of symbols is 6, and the number of bits x of the upstream message data that each of the symbols can carry.
  • the error feedback parameter may include: performing, for the uplink feedback error, a desired number of bits of message overhead required for encapsulation; and a vectored band including a feedback error included in each of the downlink sounding symbols Number, the first vector
  • the number of required quantization feedback error band including subcarriers and the number of bits required to represent the measured on subcarriers of each of the bands vectoring needs feedback error error ⁇ .
  • the setting unit 1430 can calculate the value of the ⁇ using Equation 7 above.
  • the expected number of bits of message overhead required for message encapsulation of the uplink feedback error data refers to message encapsulation of the uplink feedback error data, which is an expected value of message overhead, in some package formats. This expectation may not be the same as the actual cost value. For example, in an HDLC-like encapsulation format, the overhead required for different payloads is different due to octet transparency. In some cases, this expected value can be set to zero.
  • the calculating unit 1440 is connected to the 10 unit 1410, and is configured to combine the error data received by the 10th unit 1410 from the network side device by the uplink symbol feedback of the uplink time of the continuous C superframes to be combined with one
  • the error data corresponding to the downlink detection symbol is used, and the crosstalk cancellation coefficient is calculated based on the combined error data.
  • C is an integer greater than or equal to N and less than or equal to M.
  • the VCE 1400 can also include a monitoring unit 1450.
  • the monitoring unit 1450 is connected to the setting unit 1430, and is mainly used for monitoring a change of a channel in the DSLAM system, and when the channel is newly created or deleted in the DSLAM system, the setting unit 1430 is re-based on the DSLAM system.
  • the superframe structure parameters and the error feedback parameters of the current channels in each of the channels calculate the value of the N, and the value of the M is re-determined based on the value of the N.
  • the VCE 1400 can cause the setting unit 1430 to dynamically adjust the M to an appropriate value according to the change of the channel in the DSLAM system through the monitoring unit 1450, so that even if a channel is newly created in the DSLAM system or Eliminating, and ensuring that the user side device and the network side device perform detection modulation and error feedback based on the values of the M, the C, and the L, that is, ensuring that the error feedback of the user side device is The detection modulation of the network side device is sequentially followed, thereby further improving the accuracy of the crosstalk cancellation coefficient.
  • Example 10 Example 10
  • FIG. 15 is a block diagram showing the structure of a VCE according to another embodiment of the present invention.
  • the VCE 1500 is applicable to a DSLAM system including the VCE, the network side device, and the user side device, and includes a 10 interface 1510 and a processor 1520.
  • the 10 interface 1510 is connected to the network side device and the processor 1520, and is mainly used for communicating with the network side device.
  • the processor 1520 is connected to the 10 interface 1510 and is mainly used for:
  • the 10 interface 1510 notifies the network side device.
  • the detection sequence includes a string
  • each a bit constitutes one probe element, and a is an integer greater than or equal to 1.
  • N is the number of superframes required by the user side device to feed back the error measured on the downlink sounding symbols of one super frame.
  • [104] Combine the error data received by the network side device via the 10th interface 15 10 by the uplink symbol feedback that occupies the uplink time of the consecutive C superframes into the error data corresponding to the 1 downlink detection symbol, The crosstalk cancellation coefficient is calculated based on the combined error data.
  • C is an integer greater than or equal to N and less than or equal to M; M is an integer greater than or equal to N, indicating that the downlink sounding symbol is continuously superposed by the network side device to the same detecting element in the sounding sequence The number of frames.
  • the superframe structure parameter may include: each of the super The number of TTD frames included in the frame, the number 6 of uplink symbols included in each of the frames, and the number of bits of the data that can be carried by each of the uplink symbols.
  • the error feedback parameter may include: a desired number of bits of message overhead required for message encapsulation of an uplink feedback error; each of the downlink probe symbols included The number of Vectored Bands that require feedback error, the number of subcarriers in the first vectorization band that require feedback error, and the measurement on each subcarrier that requires feedback error in the first vectorization band The number of bits required for the error.
  • the processor 1520 can calculate the value of the N using Equation 6 above.
  • the superframe structure parameter may include: The number 6 of symbols included in the superframe, and the number x of bits of uplink message data that each of the symbols can carry.
  • the error feedback parameter may include: canceling an uplink feedback error, encapsulating a required number of bits required for encapsulation, and a vectorized frequency band required for each of the downlink sounding symbols (Vectored Band) ) number, the number of sub-carriers need of feedback errors contained bands vectoring t k; and represents a desired measurement on the first frequency band of the vectoring needs feedback error subcarriers each error bit number ⁇ .
  • the processor 1520 can calculate the value of the ⁇ using Equation 7 above.
  • the processor 1520 is further configured to monitor a change of a channel in the DSLAM system, and re-based on the DSLAM when detecting or deleting a channel in the DSLAM system.
  • the superframe structure parameters and error feedback parameters of the current channels in the system calculate the value of the N, and the value of the M is re-determined based on the value of the N.
  • the VCE 1500 can dynamically adjust the M to an appropriate value according to the change of the channel in the DSLAM system by the processor 1520, even if a channel new or eliminated occurs in the DSLAM system, the The user side device and the network side device perform probe modulation and error feedback based on the values of the ⁇ 1, the C, and the L, that is, ensuring that the error feedback of the user side device follows the network in an orderly manner.
  • the detection of the side device is modulated to further improve the accuracy of the crosstalk cancellation factor.
  • FIG. 16 is a block diagram showing the structure of a VCE according to still another embodiment of the present invention.
  • the VCE 1600 may be a host computer with computing power, a personal computer PC, or a portable computer or terminal that can be carried.
  • the specific embodiments of the present invention do not limit the specific implementation of the computing node.
  • the VCE 1600 includes a processor 1610, a 10 interface 1620, a memory 1630, and a bus 1640.
  • the processor 1610, the IO interface 1620, and the memory 1630 complete communication with each other through the bus 1640.
  • the 10 interface 1620 is for communicating with a network side device in the DSLAM system.
  • the memory 1630 is used to store programs and/or data, and the program may be program code including computer operating instructions.
  • the memory 1630 may include a high speed RAM memory, and may also include a non-volatile memory such as at least one disk memory.
  • Memory 1630 can also be a memory array.
  • the memory 1630 may also be partitioned, and the blocks may be combined into a virtual volume according to certain rules.
  • the processor 1610 is used for a program.
  • the processor 1610 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.
  • ASIC Application Specific Integrated Circuit
  • the processor 1610 causes the VCE 1600 to perform the following operations by executing a program stored in the memory 1330: the VCE allocates a sounding sequence to the network side device; The VCE calculates a value of N based on a superframe structure parameter and an error feedback parameter of each channel in the D SLAM system, determines a value of the M based on the value of the N, and notifies the network of the value of the M And the VCE receives the error data of the uplink symbol feedback that is up to the uplink time of the consecutive C superframes from the network side device, and the uplink symbol feedback that takes up the uplink uplink time of the consecutive C superframes
  • the error data constitutes error data corresponding to one downlink detection symbol, and the crosstalk cancellation coefficient is calculated based on the combined error data.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one detecting element, a is an integer greater than or equal to 1; C is an integer greater than or equal to N and less than or equal to M N represents the number of superframes required by the user side device to feed back the error measured on the downlink sounding symbols of one superframe; and M represents that the downlink sounding symbol is detected by the network side device.
  • the number of consecutive superframes modulated by the same probe element in the sequence, M being an integer greater than or equal to N.
  • a DSLAM system comprising one VCE 1400/1500/1600, at least two network side devices 800/900/1000 and at least two users.
  • the pilot sequence consists of a sequence of 0, 1 sequences that are sequentially and cyclically modulated on the synchronization symbols.
  • bit When the bit is 0, all probe subnes of the current sync symbol modulate the constellation point 00 in the 4-QAM constellation (corresponding to 1 + 1 i); when the bit is 1, all probes of the current sync symbol
  • the subcarriers modulate the constellation point 11 in the 4-QAM constellation (corresponding to -1-li;).
  • the subcarriers in the downlink sounding symbols are modulated in a group by rotation.
  • the subcarriers of the sounding symbols may be divided into two groups, and the two sets of subcarriers are used alternately as the sounding subcarriers and the labeled subcarriers.
  • PS denotes a probe subcarrier
  • SF denotes a marker subcarrier.
  • the VCE needs to notify the user side device to the network side device and the user side device to detect the corresponding form of the probe subcarrier and the labeled subcarrier on the probe symbol.
  • the subcarriers of the sounding symbols may also be divided into multiple groups, and the subcarrier groups are labeled in a first manner using, for example, a sounding carrier group.
  • the format of the second mode correlation or the like alternates the subcarriers on the sounding symbols in groups.
  • the detection subcarrier group internally modulates the same detection element
  • the labeled subcarrier group internally modulates the opposite constellation points, so that the VCE only needs to notify the network side device and pass the network side device.
  • a pair of subcarrier groups modulating the same sounding element are probe subcarriers
  • a pair of subcarrier groups modulating mutually opposite constellation points are labeled subcarriers
  • group 1 and group 2 constitute a pair of subcarriers Pairs
  • Groups 3 and 4 simultaneously form a pair of subcarrier pairs.
  • the VCE can obtain complete error information of all subcarriers corresponding to the sounding symbols, so that the channels on all the subcarriers can be completely estimated.
  • the subcarriers in the sounding symbols are not only used for detecting modulation, but also for at least two other types of uses such as mark modulation, that is, subcarriers in the sounding symbols have u use.
  • the probe can be The subcarriers of the symbol are divided into groups of u, and the subcarriers of the U group are alternately used as the U type.
  • the VCE needs to notify the user side device to the network side device and through the network side device to notify the user side device of the corresponding form of the subcarrier group of the u-type use on the probe symbol.
  • the subcarriers in the sounding symbols have a u-type use (u is greater than or equal to 3).
  • the set of u subcarrier groups on the probe symbol is modulated in turn.
  • the VCE can obtain complete error information of all subcarriers corresponding to the sounding symbols, so that the channels on all the subcarriers can be completely estimated.
  • the method according to this embodiment of the present invention is applicable to a DSLAM system including a VCE, a network side device, and a user side device, and includes:
  • the VCE calculates a value of N based on a superframe structure parameter and an error feedback parameter of each channel in the DSLAM system, and determines a value of M based on the value of the N (S 191 1 ), and determining a position of a superframe of the detection symbols including the modulation probe elements in the consecutive M superframes in the consecutive M superframes, and then notifying the network side device of the value of the M, and Notifying the network side device of the location information of the superframe including the probe symbol of the modulation probe element.
  • the N indicates the number of superframes required by the user side device to feed back the error measured on the downlink sounding symbols of one super frame.
  • M represents the number of consecutive superframes, and the M The downlink sounding symbols of at least one superframe in the consecutive superframes are modulated by the network side device by using the same sounding element in the sounding sequence, and M is an integer greater than or equal to N.
  • the sounding sequence includes a string of 0, 1 bits, and each a bit constitutes one sounding element, and a is an integer greater than or equal to one.
  • the network side device records the value of the M (S 1921 ), and notifies the user side device of the value of the M.
  • the network side device records superframe position information of the detected symbols including the modulated probe elements in the consecutive M superframes. And, in a possible implementation manner, the network side device notifies the user side device of the location information of the superframe of the modulation probe element, so that the user side device correctly identifies the downlink detection symbol of the modulation probe element. . In another possible implementation manner, the network side device device does not notify the user side device of the location information of the superframe of the modulation probe element, and the user side device identifies the downlink detection symbol of the modulation probe element by itself. .
  • the user side device determines the values of C and L based on the received value of the M and the value of its own N (S 193 1 ).
  • the value of the self N is a value of N calculated by the user equipment based on a superframe structure parameter and an error feedback parameter of a channel to which the user equipment is connected.
  • C is an integer greater than or equal to N and less than or equal to M
  • L is an integer greater than or equal to 1 and less than or equal to M.
  • the VCE allocates a sounding sequence to the network side device (S 1912), and sends the allocated sounding sequence to the network side device.
  • the network side device After receiving the sounding sequence allocated by the VCE, the network side device modulates each detecting element in the sounding sequence, and each of the detecting elements is modulated in consecutive M
  • the downlink sounding symbol of at least one superframe in the superframe is transmitted (S 1922), and the modulated superframe is sent to the user side device.
  • the downlink sounding symbols modulated by the different sounding elements are different; in another possible implementation, each of the detecting elements in the sounding device is modulated by the network side device, and each The detecting elements are modulated in at least one of consecutive M superframes In the operation on the downlink sounding symbol of the superframe (S 1922), the superframe containing the downlink sounding symbol of the modulated sounding element transmitted by the network side device and the same time are sent by other network side devices in the DSLAM system The superframe containing the downlink sounding symbols of the modulated sounding elements is the same. In this way, since all the lines respectively use the detection elements of the respective sounding sequences to repeatedly modulate at least one downlink sounding symbol at the same time, the accuracy of the crosstalk canceling coefficient can be ensured.
  • the user side device calculates a statistical average of the errors measured on the downlink sounding symbols of the L superframes of the downlink sounding symbols including the modulated sounding elements in the consecutive M superframes (S 1932) And using the up-symbol feedback of up to the uplink duration of consecutive C superframes to represent the statistically averaged error data (S 1933).
  • the L superframes may be any one of the superframes in which the downlink probe symbols of the modulated probe elements are included in the M superframes.
  • the L superframes may be a plurality of superframes in which the downlink detection symbols including the modulation probe elements in the M superframes are consecutive or intermittent.
  • the uplink symbol that occupies at most the uplink duration of consecutive C superframes may be an uplink symbol of consecutive multiple superframes from the head of a certain superframe, or may be continuous from any intermediate part of a certain superframe.
  • the upstream symbol of multiple superframes may be a plurality of superframes in which the downlink detection symbols including the modulation probe elements in the M superframes are consecutive or intermittent.
  • the VCE may pass the maximum C consecutive frames.
  • the error data of the uplink symbol feedback of the uplink duration is combined into error data corresponding to one downlink probe symbol (S 1913), and the crosstalk cancellation coefficient is calculated based on the combined error data (S 1914).
  • the user side device will terminate the feedback error data and enter the feedback of the next measurement error.
  • 20a to 20c are diagrams showing superframe streams for detecting modulation and error feedback by the method shown in FIG.
  • the side device uses the uplink symbol that occupies the uplink time of the continuous C superframes to feed back the error data measured on one downlink sounding symbol.
  • the above method according to an embodiment of the present invention can make the error feedback of the user side device follow the order.
  • the probe modulation of the network side device can calculate the crosstalk cancellation coefficient of the DSLAM system economically and accurately even when it is necessary to use a plurality of super frames to uplink feedback errors measured on one downlink sounding symbol.
  • step S 191 1 is shown in FIG. 19 as being performed before step S 19 12, the present invention is not limited thereto, and those skilled in the art should understand that step S 1911 can also be in step S. After 1912 or simultaneously with step S 1912.
  • each detection element in the detection sequence is Modulation is to be performed to ensure that the user side device feeds back at least an error on all detected symbols corresponding to a complete sounding sequence.
  • the network side device modulates each of the sounding elements in the sounding sequence, and each of the sounding elements modulates at least one superframe in consecutive M superframes
  • the operation on the downlink detection symbol (S 1922) is repeated at least once.
  • the superframe structure parameter may include: each of the super The number of TTD frames included in the frame, the number of uplink symbols included in each of the frames, and the number of bits of the data that can be carried by each of the uplink symbols.
  • the error feedback parameter may include: a desired number of bits of message overhead required for message encapsulation of the uplink feedback error data; and a number of vectored bands required for each of the downlink sounding symbols to be required for feedback error , the number of subcarriers in the first vectorization band that require feedback error ⁇ ; and the representation in the first vector Quantizing each of said frequency bands required number of bits required for error measured on subcarriers feedback errors ⁇ .
  • the VCE can calculate the value of the ⁇ by using Equation 6 below, where " ⁇ " represents. The integer is taken up.
  • the superframe structure parameter may include: The number 6 of symbols included in the superframe, and the number x of bits of uplink message data that each of the symbols can carry.
  • the error feedback parameter may include: canceling the uplink feedback error data, and encapsulating the required number of bits of the overhead, ⁇ ; a vectorized frequency band required by each of the downlink sounding symbols to be required for feedback error (Vectored Bands, the number of subcarriers in the first vectorization band that require feedback error; and the number of bits required to represent the error measured on each of the subcarriers that require feedback error in the first vectorization band 3 ⁇ .
  • the VCE can calculate the value of the N by using Equation 7 below, where " ⁇ " indicates that ⁇ is taken up as an integer.
  • the VCE calculates the value of N by using Equation 6 or Equation 7 above
  • the N value calculated for the channel is used as the entire DSLAM system.
  • N value if the DSLAM system includes multiple channels, the N value will be calculated for each channel, and the maximum N value is preferably used as the N value of the entire DSLAM system to ensure error feedback for all user side devices.
  • the detection modulation of the network side device is followed sequentially.
  • the expected bit number z of the message overhead required for message encapsulation of the uplink feedback error data refers to canceling the uplink feedback error data, and the encapsulation is an expected value of the message overhead.
  • the expected value may not be the same as the actual cost value.
  • the overhead required for different payloads is different due to octet transparency. In some cases, this expected value can be set to zero.
  • the network side device modulates each of the sounding elements in the sounding sequence, and each of the sounding elements is modulated in at least M consecutive superframes.
  • the superframe containing the downlink sounding symbol of the modulated sounding element transmitted by the network side device and the same time are sent by other network side devices in the DSLAM system
  • the superframe containing the downlink sounding symbols of the modulated sounding elements is the same.
  • each of the detecting elements in the sounding device is modulated by the network side device, and each of the detecting elements is modulated in at least M consecutive super frames.
  • the network side device may cause each of the consecutive manners in a predetermined manner, for example, a pattern for marking a synchronization symbol in G.993.5
  • the downlink sounding symbols of the kth superframe in the M superframes have a structure fixed pattern. Where k is an integer greater than or equal to 1 and less than or equal to M.
  • the network side device has a structure in which the downlink sounding symbols of a superframe of each of the consecutive M superframes have a fixed structure, so that the user equipment can be configured according to whether the downlink sounding symbols have a fixed structure.
  • the error feedback of the user side device it is more helpful for the error feedback of the user side device to follow the detection modulation of the network side device in an orderly manner.
  • the detection modulation method, the error feedback method, the crosstalk cancellation coefficient acquisition method, and the corresponding network side device, the user side device, the vectorization control entity, and the DSLAM system are provided by the network side device according to the embodiment of the present invention.
  • the same probe element modulates successive M superframes and uses up to C consecutive superframes on the user side device
  • the uplink symbol of the line duration feeds back the error data measured on one downlink sounding symbol
  • the method according to an embodiment of the present invention enables the error feedback of the user side device to follow the sounding modulation of the network side device in an orderly manner, even when needed
  • the crosstalk canceling coefficient of the D SLAM system can also be calculated economically and accurately.
  • the function is implemented in the form of computer software and sold or used as a stand-alone product, all or part of the technical solution of the present invention (for example, contributing to the prior art) may be considered to some extent.
  • Part is embodied in the form of computer software products.
  • the computer software product is typically stored in a computer readable storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present invention.
  • the foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

La présente invention concerne la fourniture à un système DSLAM d'un accès xDSL multi-chemin, et porte sur un procédé de modulation de sonde pour éliminer une diaphonie d'extrémité distante d'un canal dans un système DSLAM, un procédé de rétroaction d'erreur, un procédé d'obtention de coefficient d'annulation de diaphonie, un dispositif côté réseau correspondant, un dispositif côté utilisateur, une entité de commande de vectorisation, et le système DSLAM. Le procédé comprend : le calcul, selon un paramètre de structure de supertrame et un paramètre de rétroaction d'erreur d'un système DSLAM, du nombre N de supertrames requises par une erreur détectée par une rétroaction de liaison montante sur un symbole de sonde de liaison descendante ; la modulation, selon le nombre N calculé, de chaque élément de sonde d'une séquence de sondes à un symbole de sonde de liaison descendante de M supertrames consécutives ; et par utilisation d'une erreur détectée renvoyée par un symbole de liaison montante occupant un maximum de C supertrames consécutives sur un symbole de sonde de liaison descendante, la permission de rétroactions d'erreur qui suivent de manière ordonnée la modulation de sonde et la rétroaction complète d'une erreur sur un symbole de sonde correspondant à la séquence de sondes entière.
PCT/CN2013/074783 2013-04-03 2013-04-26 Procédé de modulation de sonde, procédé de rétroaction d'erreur, et dispositif et système correspondants WO2014161211A1 (fr)

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CN102301612A (zh) * 2009-01-30 2011-12-28 兰蒂克德国有限责任公司 矢量传输中的串扰系数更新
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