WO2012171201A1 - Procédé et appareil d'activation de paires de lignes nouvellement raccordées dans un système xdsl et système xdsl - Google Patents

Procédé et appareil d'activation de paires de lignes nouvellement raccordées dans un système xdsl et système xdsl Download PDF

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Publication number
WO2012171201A1
WO2012171201A1 PCT/CN2011/075809 CN2011075809W WO2012171201A1 WO 2012171201 A1 WO2012171201 A1 WO 2012171201A1 CN 2011075809 W CN2011075809 W CN 2011075809W WO 2012171201 A1 WO2012171201 A1 WO 2012171201A1
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WIPO (PCT)
Prior art keywords
pair
pilot sequence
newly added
transmission data
data phase
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PCT/CN2011/075809
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English (en)
Chinese (zh)
Inventor
王祥
刘立贺
李程
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180000782.3A priority Critical patent/CN102224717B/zh
Priority to PCT/CN2011/075809 priority patent/WO2012171201A1/fr
Publication of WO2012171201A1 publication Critical patent/WO2012171201A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26136—Pilot sequence conveying additional information

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for activating a newly added pair in an xDSL system, and an xDSL system. Background technique
  • xDSL is a general term for various types of DSL (Digital Subscribe Line).
  • xDSL is a high-speed data transmission technology for transmission over telephone twisted pair.
  • DSL for baseband transmission such as IDSL (ISDN-based digital subscriber line) and SHDSL (single-pair high-speed digital subscriber line)
  • xDSL for passband transmission uses frequency division multiplexing technology to enable xDSL to coexist with traditional telephone service (POTS).
  • POTS traditional telephone service
  • a device that provides multiple xDSL access is called a DSL Access Multiplexer (DSLAM).
  • DSL Access Multiplexer DSL Access Multiplexer
  • the synchronization symbols are modulated and transmitted using a pilot sequence loop.
  • the CO (Central Office) side resolves each subcarrier on the synchronization symbol.
  • the transmitted signal is calculated and the error samples are calculated.
  • the CPE (client device) side parses the signal transmitted on each subcarrier on the synchronization symbol and calculates an error sample, and then feeds the error sample back to C0.
  • the CO side estimates the frequency domain transmission matrix or the uplink and downlink crosstalk cancellation coefficients on each subcarrier by using uplink and downlink error samples and known or parsed transmission signals.
  • the pilot sequences are generally orthogonal to make calculation of the channel or cancellation factor faster and easier.
  • the length of the pilot sequence is at least equal to the total number of newly added pairs in the current system and the total number of pairs in the transmission data phase (Showt ime). Therefore, in order to completely and accurately estimate the channel or cancellation coefficient between lines in the current system, at least the orthogonal pilot sequence with the length of all lines is required to modulate the synchronization symbol, that is, it is necessary to transmit a plurality of synchronization symbols of all lines.
  • Embodiments of the present invention provide a method and apparatus for activating a newly added pair in an xDSL system, and an xDSL system, which can reduce the time for estimating the crosstalk cancellation coefficient between all pairs, thereby reducing the activation time of newly added pairs.
  • a method for activating a newly added pair in an xDSL system comprising:
  • the crosstalk cancellation coefficient of the pair in the transmission data phase is Constructing an augmented pilot sequence based on the initial pilot sequence
  • the new join line pair is activated to go online to enter the transmission data phase.
  • a DSL access multiplexer includes:
  • An initial pilot sequence construction module configured to construct an initial pilot sequence according to a crosstalk cancellation coefficient between the pair of lines currently in the transmission data phase and the number of newly added pairs;
  • a channel estimation module configured to estimate, according to the initial pilot sequence, a crosstalk cancellation coefficient of a newly added pair pair in a transmission data phase line pair;
  • An augmented pilot sequence constructing module configured to construct a boosted pilot sequence based on the initial pilot sequence based on the crosstalk cancellation coefficient of the pair of transmission data phase pairs according to the newly added pair;
  • the channel estimation a module configured to estimate, according to the augmented pilot sequence, a crosstalk cancellation coefficient of a pair of newly added pairs in a transmission data phase;
  • the activation module is configured to activate the new joining pair to go online to enter the transmission data phase.
  • An xDSL system including a client device CPE and a central office CO, wherein
  • the client device is configured to notify the central office of the crosstalk cancellation coefficient between the pair of lines currently in the transmission data phase and the number of newly added pairs;
  • the central office is configured to construct an initial pilot sequence according to the crosstalk cancellation coefficient between the pair of lines currently in the transmission data phase and the number of newly added pairs, and estimate the new pair of pairs according to the initial pilot sequence.
  • a crosstalk cancellation coefficient in a transmission data phase line pair constructing an augmented pilot sequence based on the initial pilot sequence based on the crosstalk cancellation coefficient of the pair of transmission data phase pairs, according to the The pilot sequence is augmented, and the crosstalk cancellation coefficient of the pair of newly added pairs in the transmission data phase is estimated, and the newly added pair is activated to go online to enter the transmission data phase.
  • a method and apparatus for newly adding a pair of lines and an xDSL system construct an initial pilot sequence according to the crosstalk cancellation coefficient between the pair of lines currently in the transmission data phase and the number of newly added pairs. And estimating the crosstalk of the newly added pair to the pair in the transmission data phase
  • the cancellation coefficient based on the estimated crosstalk cancellation coefficient, constructs an augmented pilot sequence based on the initial pilot sequence, and estimates a crosstalk cancellation coefficient of the pair of newly added pairs in the transmission data phase pair.
  • the embodiment of the present invention reduces the scale of the pilot sequence, and can reduce the time for estimating the crosstalk cancellation coefficient between all pairs, thereby reducing the activation time of the newly added pair.
  • Embodiment 1 is a flowchart of a method according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of a channel matrix between a pair of transmission data phase pairs and all pairs of the newly added line pair in the second embodiment of the present invention
  • FIG. 5 and FIG. 6 are schematic structural diagrams of a DSL access multiplexer according to Embodiment 4 of the present invention.
  • FIG. 7 is a schematic structural diagram of an xDSL system according to Embodiment 5 of the present invention. detailed description
  • This embodiment provides a method for activating a newly added pair in an xDSL system. As shown in FIG. 1, the method includes: 1 01.
  • the DSLAM DSL Access Multiplexer
  • the DSLAM estimates, according to the initial pilot sequence, a crosstalk cancellation coefficient of the newly added pair pair in the transmission data phase line pair.
  • the DSLAM constructs an augmented pilot sequence based on the initial pilot sequence according to the crosstalk cancellation coefficient of the pair of transmission data phase pairs.
  • the DSLAM estimates the crosstalk cancellation coefficient of the pair of newly added pairs in the transmission data phase according to the augmented pilot sequence.
  • the DSLAM activates the new join line pair to enter the transmission data phase.
  • the DSLAM constructs an initial pilot sequence according to the crosstalk cancellation coefficient between the pair of lines currently in the transmission data phase and the number of newly added pairs, and estimates the new joining line. Constructing an augmented pilot sequence based on the estimated pilot crosstalk cancellation coefficient based on the estimated crosstalk cancellation coefficient on the basis of the initial pilot sequence, and estimating the line pair pair new joining line in the transmission data phase The crosstalk cancellation factor of the pair.
  • the embodiment of the present invention reduces the scale of the pilot sequence, and can reduce the time for estimating the crosstalk cancellation coefficient between all pairs, thereby reducing the activation time of the newly added pair.
  • This embodiment provides a method for activating a newly added pair in an xDSL system.
  • the Vec tored-DSL system by analyzing the crosstalk cancellation coefficient between line pairs currently in the transmission data phase, the current All strong and weak relationships between the pairs of lines in the transmission data phase. Through the strong and weak relationship, the line pairs in the transmission data phase may be explicitly or implicitly merged into multiple groups, that is, the pair of lines in the group have a serious crosstalk, and any two pairs are not in the same group. The crosstalk between the lines is weak or almost ineffective.
  • the displayed merged into multiple groups refers to the actual grouping of the pair in the transmission phase, and then respectively analyzing and processing the crosstalk cancellation coefficients of the pairs in each group, and the groups obtained here are For the group to be displayed; and implicitly merged into multiple groups, it means that the pair of lines in the transmission phase are not actually grouped, but the crosstalk cancellation coefficient is analyzed and processed, and multiple pairs are put together. Performing, a plurality of pairs of pairs of crosstalk canceling coefficients analyzed and processed together constitute an implicit group.
  • the method includes:
  • the DSLAM constructs an initial pilot sequence according to the current packet that is already in the transmission data phase (showtime) pair and the number of new join-in pairs.
  • the ⁇ line of the matrix M is arbitrarily selected as the pilot sequence of each pair of line pairs in the newly added pair, and the sub-matrix formed by the ⁇ line is ⁇ .
  • the rows are arbitrarily selected as the initial pilot sequences of the existing paired pairs.
  • the assigned pilots of the newly added pair are respectively the 2nd row and the 3rd row of the above matrix:
  • the first row and the second group are respectively assigned the fourth row of the above matrix, the seventh row:
  • bit 0 is mapped as follows:
  • the pilots in the transmission data phase line pair of the first group and the second group are respectively:
  • the DSLAM modulates the synchronization symbol according to the initial pilot sequence, obtains an error sample, and estimates, according to the error sample, a crosstalk cancellation coefficient of the pair of pairs in the transmission data phase and a crosstalk between the newly added pairs.
  • the cancellation factor or only the crosstalk cancellation factor of the newly added pair pair in the transmitted data phase pair.
  • the crosstalk cancellation coefficient can be estimated by:
  • step 201 & will use the initial pilot sequence to modulate the sync symbols, and the initial pilot sequence S* will be used to modulate the sync symbols.
  • bit 0 in the pilot sequence represents all subcarrier modulations of the synchronization symbol all zeros, that is, modulating 00 on all subcarriers to transmit the constellation point 1+i in the 4-QAM constellation.
  • Bit 1 in the frequency sequence represents all subcarrier modulations of the sync symbol all 1s, i.e., modulation 11 on all subcarriers to transmit the constellation point -li in the 4-QAM constellation.
  • a row of a matrix composed of positive and negative 1 is generally used as a pilot sequence, and the following correspondence is used:
  • each subcarrier uses a scrambling code to rotate the transmitted constellation points.
  • the function of the scrambling code is to rotate the constellation points 0, 90, 180, 270 degrees, equivalent to multiplying the original constellation points by 1, i, -1, _i.
  • the amplitude of the rotated constellation points is adjusted for transmission, so that the transmitted constellation points can always be expressed as plus or minus 1 times a complex number.
  • any one of the subcarriers of all the subcarriers of the initial pilot sequence is assumed. If the complex number of the subcarrier is multiplied by t, the error samples obtained by the feedback are (ignoring the influence of noise and quantization error): "" 0 ⁇ ⁇ 0 ⁇
  • the DSLAM pairs the crosstalk cancellation coefficient in the transmission data phase pair and the crosstalk cancellation coefficient between the newly added pair according to the newly added pair, or only according to the new joining pair in the transmission data phase pair.
  • the crosstalk cancellation coefficient is re-grouped for the newly added pair and the data phase in the transmission data phase.
  • the DSLAM constructs an augmented pilot sequence based on the initial pilot sequence according to the result of the regrouping.
  • ⁇ 0 is the unitary matrix, ie the vector r, the first of r
  • the new pilot sequence assigned to group 0i is:
  • Sending with the newly allocated pilot sequence and receiving the error samples, and combining the pilot sequences allocated by the w + 1 groups in step 201 and the corresponding error samples, can calculate the pair of pairs in the transmission data phase.
  • a crosstalk cancellation coefficient can be calculated internal to the newly added line in the w in the data transmission phase line.
  • the DSLAM estimates, according to the augmented pilot sequence and the error sample, a crosstalk cancellation coefficient between a pair of newly added pairs in a transmission data phase pair and/or a crosstalk cancellation between newly added pairs. Coefficient.
  • the channel and crosstalk cancellation coefficients can be estimated as follows:
  • case 1 and case 2 in step 203 are not repeated here, and only case 3: w ⁇ 2 is considered here.
  • the crosstalk cancellation coefficient of the pair of newly added pairs in the transmission data phase is approximately equal to -.
  • the crosstalk cancellation factor between the newly added pairs is approximately equal to /-O.
  • the DSLAM activates the newly added pair to go online to enter the transmission data phase.
  • the DSL AM constructs an initial pilot sequence according to the number of packets currently in the transmission data phase pair and the number of newly added pairs, and estimates the newly added pair.
  • the embodiment of the present invention reduces the scale of the pilot sequence, can reduce the time for estimating the crosstalk cancellation coefficient between all pairs, thereby reducing the activation time of the newly added pair;
  • the pilot sequence of the pair of pairs in the transmission data phase can be multiplexed, thereby The time to estimate the crosstalk cancellation coefficient between all pairs can be further shortened.
  • This embodiment provides a method for activating a newly added pair in an xDSL system.
  • the difference from the second embodiment is that, in this embodiment, the pilot sequence used in step 201 in the second embodiment and the new matrix used in step 204 are used.
  • ⁇ is optimized.
  • Wa 1 sh matrix is constructed as follows:
  • N is the set of natural numbers, and 2 ⁇ A e N is expressed as A taking all natural numbers greater than or equal to 2.
  • the Wa l sh matrix satisfies:
  • the method includes:
  • the DSLAM performs explicit or implicit pre-packet processing on the packet currently in the transmission data phase pair.
  • the packet described herein is based on the crosstalk cancellation coefficient between the current transmission data phase pairs, or through the Vec t ored-DSL management layer configuration.
  • the pre-packet processing described herein is to implicitly or explicitly perform the implicit or explicit packet according to a predetermined rule. Merger. For convenience of description, an explicit description is used for the pre-grouping below.
  • the current packet is preprocessed when the system line pair is online.
  • the purpose of the pre-processing is to merge the current K groups according to certain rules to reduce the time for the new join pair to activate.
  • Wa 1 sh matrix (including newly added pairs), namely:
  • the largest and corresponding merged existing grouping schemes satisfying the above conditions are found.
  • the DSLAM constructs an initial pilot sequence according to the explicit or implicit grouping of the explicit or implicit pre-packet processing and the number of newly added pairs, which are currently in the transmission data phase line pair.
  • the /* line in the Walsh matrix is arbitrarily assigned to the initial pilot sequence S* as the initial row in the Walsh matrix; the row is given as the initial pilot sequence.
  • Each pair in the Gi group is guaranteed to use a different row, and the same row of the Wa 1 s h matrix can be used between the different groups.
  • the DSLAM is in the initial pilot sequence, and the crosstalk cancellation coefficient of the newly added pair pair in the transmission data phase pair and the crosstalk cancellation coefficient between the newly added pair are estimated, or only the newly added pair pair is estimated to be in transmission.
  • the crosstalk cancellation factor of the data phase pair is estimated.
  • All pairs of pairs use the initial pilot sequence of the same length ( 2 "° ⁇ +” ⁇ ')1) assigned in step 403 to modulate the synchronization symbol, and estimate the new pair of pairs to be in the transmission data stage through the feedback error samples.
  • the DSLAM pairs the crosstalk cancellation coefficient in the transmission data phase pair according to the new joining pair, and the crosstalk cancellation coefficient between the newly added pair, or only according to the new joining pair in the transmission data phase pair.
  • the crosstalk cancellation coefficient is re-grouped for the newly added pair and the data phase in the transmission data phase.
  • the result of regrouping is that w in /1, .., 2 becomes a new group, and the others are unchanged. There may be three cases:
  • the DSLAM constructs an augmented pilot sequence based on the initial pilot sequence according to the result of the regrouping.
  • (2 : w) is the sub-vector of the second to last column of the row vector
  • x®_y represents the Kronecker product of X and ;
  • Transmitting with the new assigned pilot sequence and receiving the error samples, combined with the pilot sequence assigned by the w + 1 groups in step 302 and the corresponding error samples, can calculate all the pairs in the transmission data phase The crosstalk cancellation coefficient of the pair of newly added pairs, and the crosstalk cancellation coefficient between the newly added pairs.
  • Combining step 402 is equivalent to assigning the following augmented pilot sequences to w:
  • the DSLAM estimates, according to the augmented pilot sequence, a crosstalk cancellation coefficient between the pair of newly added pairs in the transmission data phase pair and/or a crosstalk cancellation coefficient between the newly added pairs.
  • the steps 403 acquires the error samples, w can be computed in one stage in the data transmission line crosstalk cancellation coefficients on the inner newly added line.
  • the DSLAM performs re-grouping on the re-grouped new join pair and the transmit data phase pair.
  • step 401 a pre-grouping process is performed. After steps 402-406, w and w are merged into one group. At this time, as for a part of the group, the grouping algorithm is used to obtain the obtained w and w. The union of 0i is used as a large group and regrouped.
  • the DSLAM activates the newly added pair to go online to enter the transmission data phase.
  • step 401 and step 408 are optional steps.
  • the size of the complete pilot sequence is as follows:
  • the activation time of the newly added pair can be significantly reduced.
  • the DSL AM pre-groups the packets currently in the transmission data phase pair, according to the current pair of packets in the transmission data phase and the number of newly added pairs. Constructing an initial pilot sequence, and estimating a crosstalk cancellation coefficient of the newly added pair pair in the transmission data phase pair, and a crosstalk cancellation coefficient between the newly added pair, or estimating only the newly added pair pair in the transmission data phase line a pair of crosstalk cancellation coefficients, according to the estimated crosstalk cancellation coefficient, regrouping the newly added pair and the line pair in the transmission data phase, Constructing an augmented pilot sequence based on the initial pilot sequence and estimating a crosstalk cancellation coefficient of the pair of newly added pairs in the transmission data phase, or continuing to estimate that the newly added pair is in the pair according to the result of the regrouping
  • the crosstalk cancellation coefficient of the data phase line pair is transmitted, and the re-grouped new join line pair and the transmission data phase line pair are regrouped.
  • the embodiment of the present invention reduces the scale of the pilot sequence, can reduce the time for estimating the crosstalk cancellation coefficient between all pairs, thereby reducing the activation time of the newly added pair;
  • the pilot sequence of the pair of pairs in the transmission data phase can be multiplexed, so that the time for estimating the crosstalk cancellation coefficient between all pairs can be further shortened;
  • the packet processing and the re-packet processing can further reduce the time for the new join pair to activate.
  • the DSL access multiplexer includes: an initial pilot sequence construction module 51, configured to be used according to a line pair currently in a transmission data phase. Constructing an initial pilot sequence by the crosstalk cancellation coefficient and the number of newly added pairs;
  • the channel estimation module 52 is configured to estimate, according to the initial pilot sequence, a crosstalk cancellation coefficient of a pair of newly added pairs of pairs in a transmission data phase, and a crosstalk cancellation coefficient between newly added pairs, or only estimate a new joining line a crosstalk cancellation coefficient for a pair of lines in the transmission data phase;
  • the augmented pilot sequence construction module 53 is configured to construct, according to the newly added pair, a crosstalk cancellation coefficient in a transmission data phase line pair, constructing an augmented pilot sequence on the basis of the initial pilot sequence;
  • the estimating module 52 is further configured to: according to the augmented pilot sequence, estimate a crosstalk cancellation coefficient of a pair of newly added pairs in a transmission data phase;
  • the activation module 54 is configured to activate the new joining pair to go online to enter the transmission data phase.
  • the channel estimation module 52 is further configured to estimate, according to the initial pilot sequence, a crosstalk cancellation coefficient between newly added pairs;
  • the augmented pilot sequence construction module 53 is further configured to: according to the newly added pair, a crosstalk cancellation coefficient of a pair of lines in the transmission data phase, and a crosstalk cancellation coefficient between the newly added pairs, Constructing an augmented pilot sequence based on the initial pilot sequence;
  • the channel estimation module 52 is further configured to estimate, according to the augmented pilot sequence, a crosstalk cancellation coefficient between a pair of newly added pairs in a transmission data phase pair and/or a crosstalk cancellation coefficient between the newly added pairs.
  • the augmented pilot sequence construction module 53 includes:
  • Re-grouping unit 531 configured to re-group the new joining pair and the data phase in the transmission data phase
  • the constructing unit 532 is configured to construct an augmented pilot sequence based on the initial pilot sequence according to the result of the regrouping.
  • the DSL access multiplexer may further include:
  • the pre-packet processing module 55 is configured to perform pre-group processing on the packets currently in the transmission data phase pair.
  • the DSL access multiplexer may further include:
  • the re-packet processing module 56 is configured to perform re-grouping processing on the re-grouped new joining pair and the transmitting data phase pair.
  • the initial pilot sequence construction module 51 is configured to construct an orthogonal matrix of the initial pilot sequence according to the crosstalk cancellation coefficient between the pair of lines currently in the transmission data phase and the number of newly added pairs. And the new join line pair separately occupies a partial row of the orthogonal matrix, and the remaining rows of the orthogonal matrix are multiplexed between packets currently in the transmission data phase line pair and are not repeated within the packet.
  • the channel estimation module 52 is specifically configured to: modulate a synchronization symbol according to the initial pilot sequence, obtain an error sample, and estimate, according to the error sample, a crosstalk cancellation coefficient of a pair of pairs in the transmission data phase according to the error sample. .
  • the channel estimation module 52 is further configured to estimate, according to the augmented pilot sequence and the error sample, a crosstalk cancellation coefficient of a pair of newly added pairs in a transmission data phase.
  • the DSL access multiplexer performs the packet currently in the transmission data phase pair.
  • Pre-packet processing constructing an initial pilot sequence according to the number of packets currently in the transmission data phase pair and the number of newly added pairs, and estimating the crosstalk cancellation coefficient of the newly added pair pair in the transmission data phase pair, and newly joining
  • Performing re-grouping constructing an augmented pilot sequence based on the initial pilot sequence, and estimating a crosstalk cancellation coefficient of the pair of newly added pairs in the transmission data phase, or continuing to estimate the new join.
  • the pair is paired with the crosstalk cancellation coefficient in the transmission data phase pair, and the re-grouped new joined pair and the transmitted data phase pair are regrouped.
  • the embodiment of the present invention reduces the scale of the pilot sequence, can reduce the time for estimating the crosstalk cancellation coefficient between all pairs, thereby reducing the activation time of the newly added pair;
  • the pilot sequence of the pair of pairs in the transmission data phase can be multiplexed, so that the time for estimating the crosstalk cancellation coefficient between all pairs can be further shortened;
  • the packet processing and the re-packet processing can further reduce the time for the new join pair to activate.
  • the xDSL system includes a client device (CPE) 71 and a central office (CO) 72, where
  • CPE client device
  • CO central office
  • the client device 71 is configured to notify the central office 72 of the crosstalk cancellation coefficient between the pair of lines currently in the transmission data phase and the number of newly added pairs;
  • the central office 72 is configured to construct an initial pilot sequence according to the crosstalk cancellation coefficient between the pair of lines currently in the transmission data phase and the number of newly added pairs, and estimate the newly added pair according to the initial pilot sequence. Constructing an augmented pilot sequence on the basis of the initial pilot sequence, based on the crosstalk cancellation coefficient of the pair of lines in the transmission data phase, based on the crosstalk cancellation coefficient of the pair of pairs in the transmission data phase, according to the initial pilot sequence The augmented pilot sequence is estimated, and the crosstalk cancellation coefficient of the pair of newly added pairs in the transmission data phase is estimated, and the newly added pair is activated to go online to enter the transmission data phase.
  • the central office 72 is further configured to estimate a new join according to the initial pilot sequence. a crosstalk cancellation coefficient between the pair, a crosstalk cancellation coefficient of the pair in the transmission data phase according to the newly added pair, and a crosstalk cancellation coefficient between the newly added pairs, based on the initial pilot sequence Constructing an augmented pilot sequence, estimating a crosstalk cancellation coefficient between the pair of newly added pairs and/or a crosstalk cancellation coefficient between the newly added pairs based on the augmented pilot sequence.
  • the central office 72 is further configured to re-group the newly added pair and the data phase in the transmission data phase, and construct an augmentation guide based on the initial pilot sequence according to the result of the regrouping. Frequency sequence.
  • the central office 72 is further configured to perform pre-packet processing on the packets currently in the transmission data phase pair.
  • the central office 72 is further configured to perform re-grouping processing on the re-grouped new joining pair and the transmitting data phase pair.
  • the central office performs pre-packet processing on the packets currently in the transmission data phase pair, constructs an initial pilot sequence according to the number of packets currently in the transmission data phase pair and the number of newly added pairs, and Estimating the crosstalk cancellation coefficient of the pair of pairs in the transmission data phase and the crosstalk cancellation coefficient between the newly added pair, or estimating only the crosstalk cancellation coefficient of the pair of pairs in the transmission data phase of the newly added pair, according to the estimation a crosstalk cancellation coefficient, re-grouping the newly added pair and the data phase in the transmission data phase, constructing an augmented pilot sequence based on the initial pilot sequence according to the result of the regrouping, and estimating Transmitting the data phase line pair to the crosstalk cancellation coefficient of the newly added pair, or continuing to estimate the crosstalk cancellation coefficient of the newly added pair pair in the transmission data phase pair, and retransmitting the newly added pair and transmitting data
  • the phase line pairs are grouped again.
  • the embodiment of the present invention reduces the scale of the pilot sequence, can reduce the time for estimating the crosstalk cancellation coefficient between all pairs, thereby reducing the activation time of the newly added pair;
  • the pilot sequence of the pair of pairs in the transmission data phase can be multiplexed, so that the time for estimating the crosstalk cancellation coefficient between all pairs can be further shortened;
  • the packet processing and the re-packet processing can further reduce the time for the new join pair to activate.
  • the DSL access multiplexer and the xDSL system provided by the embodiments of the present invention may implement the foregoing method embodiments. For the specific function implementation, refer to the description in the method embodiment, and details are not described herein again.
  • the activation method, the DSL access multiplexer, and the xDSL system of the newly added pair in the xDSL system may be applicable to the activation of the newly added pair in the xDSL system, but is not limited thereto.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

Abstract

Les modes de réalisation de la présente invention concernent un procédé et un appareil d'activation de paires de lignes nouvellement raccordées dans un système xDSL. Le procédé comprend les étapes consistant à : construire une séquence pilote initiale en fonction du coefficient de décalage de diaphonie entre les paires de lignes à l'étape de transmission de données et du nombre des paires de lignes nouvellement raccordées ; estimer le coefficient de décalage de diaphonie des paires de lignes nouvellement raccordées par rapport aux paires de lignes à l'étape de transmission de données en fonction de la séquence pilote initiale ; construire une séquence pilote étendue sur la base de la séquence pilote initiale en fonction du coefficient de décalage de diaphonie des paires de lignes nouvellement raccordées par rapport aux paires de lignes à l'étape de transmission de données ; estimer le coefficient de décalage de diaphonie des paires de lignes par rapport aux paires de lignes nouvellement raccordées à l'étape de transmission de données en fonction de la séquence pilote étendue ; et activer les paires de lignes nouvellement raccordées de façon à ce qu'elles soient en ligne à l'étape de transmission de données. L'invention sert à activer les paires de lignes nouvellement raccordées de façon à ce qu'elles soient en ligne dans le système xDSL.
PCT/CN2011/075809 2011-06-16 2011-06-16 Procédé et appareil d'activation de paires de lignes nouvellement raccordées dans un système xdsl et système xdsl WO2012171201A1 (fr)

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Application Number Priority Date Filing Date Title
CN201180000782.3A CN102224717B (zh) 2011-06-16 2011-06-16 xDSL系统中新加入线对的激活方法及装置、xDSL系统
PCT/CN2011/075809 WO2012171201A1 (fr) 2011-06-16 2011-06-16 Procédé et appareil d'activation de paires de lignes nouvellement raccordées dans un système xdsl et système xdsl

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