CN100563290C - Automatically select the implementation method and the device of operational mode in the XDSL network - Google Patents
Automatically select the implementation method and the device of operational mode in the XDSL network Download PDFInfo
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- CN100563290C CN100563290C CNB2005101066948A CN200510106694A CN100563290C CN 100563290 C CN100563290 C CN 100563290C CN B2005101066948 A CNB2005101066948 A CN B2005101066948A CN 200510106694 A CN200510106694 A CN 200510106694A CN 100563290 C CN100563290 C CN 100563290C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
Abstract
The present invention relates to select automatically in a kind of XDSL network the implementation method and the system of operational mode.The present invention mainly comprises: at first, by the one group sub-carrier signal of local side unit under user side unit transmission multi-mode, afterwards, the sub-carrier signal that receives according to the user side unit calculates the bit number that each subcarrier can carry, and determines the bit number that can carry of each pattern according to described bit number; At last, determine the pattern of selection according to the bit number that can carry of described each pattern.The present invention can realize the automatic selection of operational mode, as long as and once train and can select best operational mode according to the circuit physical condition.Therefore, the invention provides a kind of time of shaking hands and complexity of not increasing, and can improve the accuracy of selecting pattern for use.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to implementation method and the device of selecting operational mode in a kind of XDSL network automatically.
Background technology
Along with the continuous development of xDSL (various Digital Subscriber Line) technology, a series of technical standards relevant have been produced at present with the xDSL technology.Wherein, the standard cocooning tool body of ITU-T comprises: ADSL (ADSL (Asymmetric Digital Subscriber Line)) (G.992.1/2), ADSL2 (second generation asymmetric digital subscriber line) (G.992.3), ADSL2+ (second generation asymmetric digital subscriber line of downlink bandwidth expansion) (G.992.5), SHDSL (G.991.2), VDSL (Very-high-speed Digital Subscriber Line) (G.993.1), VDSL2 standards such as (second generation Very-high-speed Digital Subscriber Line).And each standard has also defined some appendix and has been used to satisfy different business or regional demand, and that relatively more outstanding is ADSL2 annex L (ADSL2 of expanding transmission distance), can also be called READSL2.
In order to use conveniently, the ADSL2+ system needs compatible ADSL2 and READSL2 simultaneously.VDSL2 will support VDSL2, VDSL1, ADSL2+, ADSL2 and READSL2.
Simultaneously, in order to satisfy the requirement of spectrum management, descending gross output must guarantee to be no more than 19.8dBm, therefore, in used band, the PSD mask (power spectral density masks) of annex L is higher than the PSD mask of ADSL2 annex A, and the PSD mask of ADSL2 annex A is higher than the PSD of ADSL2+annex A.
Yet along with the increase of circuit distance, HFS can not use gradually, if switch under the narrower pattern of frequency band this moment moves, and the pattern PSD mask narrower owing to frequency is higher, thereby can obtain than higher speed.Analogue also exists in VDSL2, and when distance is increased to DS1 (signal rate and form 1) when degenerating to ADSL2+ gradually, if can switch to the frequency spectrum of ADSL2+annex A, its speed will be above the speed of the PSD mask that uses DS1 always.
In the xDSL network, a kind of in order in numerous standard operational modes, to select, ITU-T has also defined corresponding Handshake Protocol G.hs, be used for consulting operational mode between xTU-C (xDSL local side unit) and the xTU-R (xDSL user side unit) and transmitting configuration parameter, so that select to use corresponding operational mode in the xDSL network.
However, because alternative mode is too many, the state machine of G.hs agreement operation also is very complicated, time-consuming.Many times xTU-C and xTU-R can support the pattern of a kind of multi-mode (composite mode), just can support ADSL2+annex A, ADSL2 annex A, ADSL2annex L, ADSL annex A, G.lite annex A simultaneously, perhaps support VDSL2, VDSL, ADSL2+annex A, ADSL2 annex A, ADSL2 annex L ADSL annex A, G.lite annex A simultaneously, at this moment, local side and user side both sides just need to select automatically according to certain rule a kind of operational mode of the best.
At present, a kind of Automode (automatic mode) technology has been proposed in the ITU-T standard.Because ITU-T has reached an agreement at present is that the selection of Automode is according to being that selected operational mode is to make uplink and downlink speed sum maximum, therefore, by calculating SNR (signal to noise ratio) is a method that is easy to expect, concrete implementation is: according to the Medley in the handshake procedure (a kind of by the binary system puppet immediately sequence be modulated to the signal that the subcarrier of all uses obtains with 4-QAM (quadrature amplitude phase modulated)) table formed of the signal to noise ratio snr of available each subcarrier of link, ATU-R (ADSL user side unit) and ATU-C (ADSL local side unit) can exchange this table, ATU-C calculates the possible speed of various pattern up-downgoings respectively with this table, then, according to this as a result selector close and state the operational mode of requirement, and restarting training, the operational mode that this moment, ATU-C provided is the pattern that last training obtains.
Though the requirement that this operational mode that needs the training of process secondary to obtain can be near the mark to greatest extent, owing to will carry out the secondary training, the time of training is long, the time upper limit that probably is above standard and requires, and implementation procedure more complicated.
At present the implementation method of the another kind of Automode that adopts is that Route Length is judged in the decay of the handshake that xTU-R sends when shaking hands, be specially by signal amplitude and estimate decay, then based on line length, and rule of thumb parameter is selected corresponding operational mode.With the interior ADSL2+annex A that uses, use ADSL2 such as 2.8km between 2.8km～3.8km, surpass 3.8km ADSL2annex L.
Though this method simply and not needs to increase the time of handshake procedure.But this method is inferred line length based on up handshake; and the method for rule of thumb selecting is too coarse; mainly be decay and then the deduction capacity that the decay of upward signal can not be expressed down direction reliably; cause occurring the lower on the contrary phenomenon of speed of the selected pattern of Automode through regular meeting; specifically as shown in Figure 1, show among Fig. 1, when this method of employing is carried out the model selection hand-off process; to cause the speed saltus step bigger at switching point, influence transmission performance.
Summary of the invention
The purpose of this invention is to provide implementation method and the device of selecting operational mode in a kind of XDSL network automatically, thereby can automatically select a kind of operational mode to carry out work, and can guarantee to obtain the highest transmission rate according to the present situation of XDSL network.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides the implementation method of selecting operational mode in a kind of XDSL network automatically, comprising:
A, the one group sub-carrier signal of local side unit under user side unit transmission multi-mode;
B, the sub-carrier signal that receives according to the user side unit calculate the signal to noise ratio of each subcarrier, and determine the bit number that can carry of each pattern according to described signal to noise ratio;
C, in the XDSL network, determine the pattern selected according to the bit number that can carry of described each pattern, comprise: C1, calculate under the broadband pattern that the bit number of part is more adjacent in the band under the narrow-band pattern with the narrow-band band in the difference of bit number of identical subcarrier set as increment in the band, but it is outer belong to the bit number of part under the broadband pattern in the broadband banding as increment outside the band also to calculate the narrow-band banding; C2, when increment in the described band during greater than the outer increment of band, then select the narrow-band pattern, otherwise, selection broadband pattern.
Described steps A comprises:
The local side unit sends the sub-carrier signal that all frequency ranges comprise to the user side unit, perhaps, sends highest frequency under the narrow frequency range pattern with all sub-carrier signals that super band comprises, and perhaps sends the pectination sub-carrier signal.
Described steps A also comprises:
During all sub-carrier signals that the highest frequency under sending all frequency ranges or narrow frequency range pattern comprises with super band, the local side unit needs to carry out the reduction of transmission power value according to the signal amplitude that the user side unit of receiving sends, or after directly transmitted power being cut down a constant power value, the sub-carrier signal that sends the performance number after cutting down is to the user side unit.
Described sub-carrier signal is that periodic intervals sends.
Described step B comprises:
B1, calculate the Background Noise Power value of each subcarrier signals performance number and each subcarrier correspondence;
B2, calculate the signal to noise ratio of each subcarrier according to described signal power value and Background Noise Power value;
The bit number that can carry under B3, each pattern of snr computation according to each subcarrier.
Described step B1 comprises:
The subcarrier that user side unit office of acceptance end unit sends, and signal calculated performance number when authorities' end unit stops to send subcarrier, then calculate the Background Noise Power value of this subcarrier correspondence.
The bit number bit (i) that each subcarrier described in the present invention can carry is:
Bit (i)=log
2(1+10
(SNR (i)-snrgap-TARSNRM)/10), wherein, SNR (i) is the signal to noise ratio of Tone (i), and snrgap is the SNR gap of T1.417 definition, and size is 9.75dB, and TARSNRM is predetermined target noise margin.
Described step B comprises:
On the user side unit, calculate each sub-carrier signal-noise ratio according to the sub-carrier signal that receives, and determine the bit number that can carry under each pattern according to described signal to noise ratio;
Perhaps,
To measure the information that obtains by the user side unit and send to the local side unit, according to each sub-carrier signal-noise ratio of described information calculations, and determine the bit number that can carry under each pattern according to described signal to noise ratio by the local side unit.
Described step C also comprises:
C3, when selectable modes during more than 2 kinds, if in broadband pattern and narrow-band pattern according to relatively be with the Nepit increment and the band outside the bit increment, select current narrow-band pattern as the broadband pattern, then be adjacent than the narrow pattern of its frequency band range as the narrow-band pattern, carry out C1 and C2 again;
Or, when selecting current broadband pattern, then this broadband pattern is made as new narrow-band pattern, be adjacent than the wideer pattern of its frequency band range as the broadband pattern, carry out C1 and C2 again.
Described each pattern comprises:
Three kinds of patterns of second generation asymmetric digital subscriber line ADSL2+annex A of downlink bandwidth expansion, and/or second generation asymmetric digital subscriber line ADSL2 annex A, and/or the second generation asymmetric digital subscriber line READSL2 of extended distance, and/or second generation Very-high-speed Digital Subscriber Line VDSL2 (G.993.2).
Described method also comprises:
D, when DSL transceiver training is finished, execution in step A after determining corresponding operational mode, changes current operational mode to step C.
Described step D comprises:
If with the signal C-Reverb calculated signals SNR of all carrier waves stack, then begin to change operational mode and corresponding frequency spectrum having modulated 4-QAM signal C-medley;
If with C-Medley calculated signals SNR, then in the back by bit and gain table bit﹠amp; Gaintable adjusts power spectrum to corresponding pattern, and corresponding operational mode information is transmitted in the message R-MSG2 of ustomer premises access equipment.
The present invention also provides the device of selecting operational mode in a kind of XDSL network automatically, comprising:
The bearing capacity computing module: the sub-carrier signal that receives according to the user side unit calculates the signal to noise ratio of each subcarrier, and according to the bit number information that can carry under each pattern of described snr computation;
Mode selection module: the bit number that can carry under each pattern that calculating is determined according to the bearing capacity computing module is selected the operational mode between local side unit and user side unit, comprise: calculate under the broadband pattern that the bit number of part is more adjacent in the band under the narrow-band pattern with the narrow-band band in the difference of bit number of identical subcarrier set as increment in the band, but it is outer belong to the bit number of part under the broadband pattern in the broadband banding as increment outside the band also to calculate the narrow-band banding; When increment in the described band during greater than the outer increment of band, then select the narrow-band pattern, otherwise, selection broadband pattern.
The present invention also provides the system of selecting operational mode in a kind of XDSL network automatically, comprises user side unit drawn game end unit, comprises the device of selecting operational mode in the described XDSL network automatically, but also comprises:
Be arranged at the subcarrier sending module in the local side unit, be used for carrying out the transmission processing of subcarrier according to predetermined condition;
Be arranged at the measurement module in the user side unit, be used to measure subcarrier signals power and corresponding Background Noise Power, and offer described bearing capacity computing module.
The device of described automatic selection operational mode is arranged on user side unit or the local side unit, perhaps, is independent of the setting of user side unit drawn game end unit.
As seen from the above technical solution provided by the invention, the present invention can realize that the operational mode of automode is selected, as long as just and once train and can select best operational mode according to the circuit physical condition.Simultaneously, the present invention can also expand to the situation of the compatible ADSL2+annex A of VDSL2, ADSL2 annex A, ADSL2 annex L, also can realize the automatic selection of ADSL2+annex B and ADSL2 annex B.
Therefore, the invention provides a kind of time of shaking hands and complexity of not increasing, and can to improve the pattern of selecting for use be the order of accuarcy of the maximized pattern of speed.
Description of drawings
Fig. 1 is a circuit attenuation process schematic diagram in the prior art;
Fig. 2 is the downstream bands operating position schematic diagram under the various operational modes;
Fig. 3 is the flow chart of method of the present invention;
Fig. 4 is circuit attenuation process schematic diagram among the present invention;
Fig. 5 is the structural representation of system of the present invention.
Embodiment
As shown in Figure 2, abscissa is a frequency values among Fig. 2, and ordinate is power spectral density value (DB), and frequency spectrum is respectively in the band under the various patterns that can select:
The upstream band of ADSL2+Annex A pattern is 25.875～138KHz, and the tone number is 6～31, and downstream bands is: 138KHz～2208KHz, tone are from 32 to 511;
The upstream band of ADSL2 Annex A pattern is identical with ADSL2+Annex A, and downstream bands is: 138KHz to 1104KHz, tone are from 32 to 255;
The upstream band (wideband, broadband) of ADSL Annex L pattern is 25.875～103.5KHz, and the tone number is 6～23, and downstream bands is: 138KHZ to 552KHz, tone are from 32 to 127.
Core of the present invention is the difference of carrying according to the bit that frequency spectrum difference in the band of various patterns (three kinds of patterns) causes, select operational mode by bit increment in relatively being with and the outer bit increment of band, thereby select a kind of operational mode that can guarantee to obtain the highest transmission rate.The selection of carrying out among the present invention can be done (CPE directly selects operational mode according to result of calculation) at CPE, also can give local side with packets of information by CPE, is selected by local side.
Be specially calculate under the broadband pattern that the bit number of part is more adjacent in the band under the narrow-band pattern with the narrow-band band in the difference of bit number of identical subcarrier set as increment in the band, but it is outer belong to the bit number of part under the broadband pattern in the broadband banding as increment outside the band also to calculate the narrow-band banding; When increment in the described band whether greater than band outside during increment, then select the narrow-band pattern, otherwise, continue to judge up to finishing model selection, be about to current narrow-band pattern as the broadband pattern, and be adjacent than the narrow pattern of its frequency band range as the narrow-band pattern, carry out aforesaid operations again.
In implementation procedure of the present invention, specifically be in handshake phase, by sending whole subcarriers or pectination subcarrier, and according to the bit number of the snr computation carrying of each subcarrier, then, according to band Nepit increment and the corresponding operational mode of relatively more definite selection of being with outer bit increment.
The subclass of the C-Comb signal that described pectination sub-carrier signal can be ADSL2+, and, if use the pectination subcarrier, then adopt the bit carrying of the tone between two broach of interpolation calculation.
In addition, need to prove that whole sub-carrier signals that send among the present invention or pectination sub-carrier signal send for adopting the method that sends at interval, the transmission signal time slot is used for CPE and measures sub-carrier signal power, the stage CPE that mourns in silence measures Background Noise Power, to calculate snr value.
And, among the present invention,, then need to be PCB (Power cut back, power extraction) if employing is the subcarrier that sends whole subcarriers or begin from tone 128, still, then needn't carry out PCB for the pectination subcarrier and handle.
Method of the present invention is except being used for READSL2, ADSL2 annex A, outside the selection between three kinds of patterns of ADSL2+annex A, VDSL2 be can also be used for and READSL2, ADSL2annex A, ADSL2+annex A situation supported, promptly having four kinds of operational modes can select, like this from VDSL2 DS1 to ADSL2+ again to ADSL2 annex A, be between the READSL2 at last, realize selecting automatically operational mode.
Describe below in conjunction with the specific implementation of accompanying drawing method of the present invention.
As shown in Figure 3, method of the present invention may further comprise the steps in specific implementation process:
Step 31:ATU-C sends the C-Tones signal of revising;
In the C-Tones stage of present G.hs, ATU-C sends tones 40,56,64, and in order to obtain more information, the present invention revises the C-Tones signal, specifically can send three kinds of C-Tones signals:
The first sends all tones from tone 32～511;
It two is to send from 128 to 511 tones;
It three is the C-Comb signals that send the channel discovery stage of ADLS2+annex A, and just tone 35,47,59,64,71,83,95,107,119,143,179,203,227 and 251 and all 251+k * 24 (k is an integer, and 251+k * 24＜511), for VDSL2, send channel discovery signal;
Receiver overload for fear of modem, if use all tone or tone128～tone512, CO (local side) needs to carry out power extraction according to the signal amplitude that the CPE that receives sends, also can fix a reduction value PCB, transmitted power is reduced the PCB value to be sent later on again, and for C-Comb (pectination) signal, then required power is not cut down, because its power itself has only 8.9dBm.
The C-Tones signal of this modification that CO sends is also with certain cycle switch, and such as sending the 16ms signal, the 16ms that then mourns in silence moves in circles then.
Step 32: CPE estimates the signal power Ps of each tone when signal is arranged, and CPE estimates the Background Noise Power Pn on each tone when no signal.
CPE according to receive Tone (i) signal power Ps (i) and and noise power Pn (i), calculate signal to noise ratio (signal to noise ratio snr (i)=Ps (i)-Pn (i)), the computing formula of the achievable rate ATTNDR that G.992.3 provides according to ITU-T (ATTainable Net Data Rate) then:
Obtain calculating the formula of the bit number that each tone can carry:
bit(i)＝log
2(1+10
(SNR(i)-snrgap-TARSNRM)/10)
Bit (i) is the bit number of Tone (i) carrying, and SNR (i) is the signal to noise ratio of Tone (i), and snrgap is the SNR gap of T1.417 definition, and for the DMT modulation, its size is 9.75dB, and TARSNRM is predefined target noise margin.
For the situation that sends the pectination sub-carrier signal,, therefore can only obtain the bit carrying number of these tone, and those there is not the tone of transmission, can calculate its bit carrying by the method for interpolation owing to only sent part tone.
Step 33: judge whether support automatic mode among the ATU-C, promptly whether support method provided by the invention, if then execution in step 35, otherwise, execution in step 34;
Certainly, if in system, only realize the present invention then need not this judgment processing steps;
Step 34: ignore each information, carry out common handshake procedure;
Step 35: whether the bit number of judging Tone128-511 less than 96, if then execution in step 36, otherwise, execution in step 37;
Step 36: select the READSL2 pattern;
Step 37: whether the bit number of judging Tone256-511 less than 75, if then execution in step 38, otherwise, execution in step 39;
Step 38: select ADSL2 annex A pattern;
Step 39: select ADSL2+annex A pattern.
Because according to the G.992.x requirement of standard-required and spectrum management of ITU-T, the transmitted power of ADSL2/ADSL2+ and READSL2 should not surpass 19.8dBm, in addition, in standard, also stipulate to adopt the scheme of flatcut back (smooth reduction), therefore, can calculate, (tone32～127) power spectral density is than the high 3dB of frequency range (tone32～127) of ADSL2 correspondence in the band of READSL2, and interior (tone 32～255) power spectral density of the band of ADSL2 is than the high 1dB of corresponding frequency band (tone32～255) of ADSL2+, as shown in Figure 2.
According to above-mentioned bit loading formula as can be known, carry the signal to noise ratio that bit needs about 3dB more, for can carrying (127-32+1) * 3/3=96bit than ADSL2 in the frequency band of READSL2 correspondence more, but the corresponding minimizing of its analog bandwidth.If so the bit that tone 128～511 can carry then means and uses READSL2 can obtain higher downstream rate less than 96.The frequency band of same ADSL2 correspondence can more than enough carrying (255-32+1) * 1/3=74.6bit than ADSL2+, if therefore tone 256～511 bit number that can carry then means the use ADSL2 speed higher than ADSL2+ less than 74.
The processing procedure that provides above is wherein a kind of concrete implementation just, considers the stage at C-Tones, and transceiver does not also train (AGC need could determine through training such as automatic gain control), may have influence on the accuracy of snr computation.Therefore can also be in the period that the transceiver training is finished, all signals that cover whole frequency bands can be used for calculating signal to noise ratio such as later C-reverb signal of C-Reverb1 and C-medley signal etc.
Consider the model selection stage of having missed, the present invention introduces the mechanism of change operational mode in the training process, is specially:
If begin to change operational mode and corresponding frequency spectrum at C-medley (having modulated the signal of all carrier wave stacks of 4-QAM (producing)) by a pseudo-random sequence generator with C-Reverb (using the signal of all carrier wave stacks of (0,0) modulation) calculated signals SNR;
If, then pass through bit﹠amp in the back with C-Medley calculated signals SNR; Gain table (bit and gain table) adjusts power spectrum to corresponding pattern, and corresponding operational mode information is transmitted in R-MSG2 (message 2 of ustomer premises access equipment).
In order to select the suitable training mode first time, can select according to the rough judgement of R-Tone-REQ (activation request signal) signal, carrying out accurate Calculation according to top scheme then.
The present invention also provides the system of selecting operational mode in a kind of XDSL network automatically, as shown in Figure 5, its structure comprises the device of selecting operational mode in the XDSL network automatically, described device is arranged on user side unit or the local side unit, perhaps be independent of user side unit drawn game end unit equipment, only being arranged on the user side unit with it among Fig. 5 is that example is drawn, when described device is arranged on the local side unit, then need the device that corresponding metrical information sends in the local side unit be handled by the user side unit;
Also comprise the subcarrier sending module that is arranged in the local side unit in the described system, be used for carrying out the transmission processing of subcarrier according to predetermined condition (being preceding step 31 described three sub-carrier signalling formulas), simultaneously, also comprise the measurement module that is arranged in the user side unit, be used to measure subcarrier signals power and corresponding Background Noise Power, and offer the bearing capacity computing module in the device of selecting operational mode in the XDSL network automatically.
Automatically select the device of operational mode in the XDSL network in the system of the present invention, as shown in Figure 5, comprise bearing capacity computing module and mode selection module, be respectively:
The bearing capacity computing module, the bit number information that can carry under each pattern of information calculations that is used for measuring according to the user side unit;
Mode selection module, the bit number that can carry under each pattern that calculating is determined according to the bearing capacity computing module is selected the operational mode between local side unit and user side unit.
Show that by simulation result this scheme can obtain reasonable result, specifically referring to shown in Figure 4, as can be seen, adopt changing method of the present invention in Fig. 4, the speed saltus step of switching point is very little.
To sum up, the present invention can realize the automatic selection of operational mode, as long as and once train and can select best operational mode according to the circuit physical condition.Simultaneously, the present invention can also expand to the situation of the compatible ADSL2+annex A of VDSL2, ADSL2 annex A, ADSL2 annex L, also can realize the automatic selection of ADSL2+annex B and ADSL2 annexB.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (15)
1, select the implementation method of operational mode in a kind of XDSL network automatically, it is characterized in that, comprising:
A, the one group sub-carrier signal of local side unit under user side unit transmission multi-mode;
B, the sub-carrier signal that receives according to the user side unit calculate the signal to noise ratio of each subcarrier, and determine the bit number that can carry of each pattern according to described signal to noise ratio;
C, in the XDSL network, determine the pattern selected according to the bit number that can carry of described each pattern, comprise: C1, calculate under the broadband pattern that the bit number of part is more adjacent in the band under the narrow-band pattern with the narrow-band band in the difference of bit number of identical subcarrier set as increment in the band, but it is outer belong to the bit number of part under the broadband pattern in the broadband banding as increment outside the band also to calculate the narrow-band banding; C2, when increment in the described band during greater than the outer increment of band, then select the narrow-band pattern, otherwise, selection broadband pattern.
2, select the implementation method of operational mode in the XDSL network according to claim 1 automatically, it is characterized in that described steps A comprises:
The local side unit sends the sub-carrier signal that all frequency ranges comprise to the user side unit, perhaps, sends highest frequency under the narrow frequency range pattern with all sub-carrier signals that super band comprises, and perhaps sends the pectination sub-carrier signal.
3, select the implementation method of operational mode in the XDSL network according to claim 2 automatically, it is characterized in that described steps A also comprises:
During all sub-carrier signals that the highest frequency under sending all frequency ranges or narrow frequency range pattern comprises with super band, the local side unit needs to carry out the reduction of transmission power value according to the signal amplitude that the user side unit of receiving sends, or after directly transmitted power being cut down a constant power value, the sub-carrier signal that sends the performance number after cutting down is to the user side unit.
4, select the implementation method of operational mode in the XDSL network according to claim 2 automatically, it is characterized in that, described sub-carrier signal is that periodic intervals sends.
5, according to the implementation method of selecting operational mode in claim 1,2, the 3 or 4 described XDSL networks automatically, it is characterized in that described step B comprises:
B1, calculate the Background Noise Power value of each subcarrier signals performance number and each subcarrier correspondence;
B2, calculate the signal to noise ratio of each subcarrier according to described signal power value and Background Noise Power value;
The bit number that can carry under B3, each pattern of snr computation according to each subcarrier.
6, select the implementation method of operational mode in the XDSL network according to claim 5 automatically, it is characterized in that described step B1 comprises:
The subcarrier that user side unit office of acceptance end unit sends, and signal calculated performance number when authorities' end unit stops to send subcarrier, then calculate the Background Noise Power value of this subcarrier correspondence.
7, select the implementation method of operational mode in the XDSL network according to claim 5 automatically, it is characterized in that,
The bit number bit (i) that described each subcarrier can carry is:
Bit (i)=log
2(1+10
(SNR (i)-snrgap-TARSNRM)/10), wherein, SNR (i) is the signal to noise ratio of Tone (i), and snrgap is the SNR gap of T1.417 definition, and size is 9.75dB, and TARSNRM is predetermined target noise margin.
8, according to the implementation method of selecting operational mode in claim 1,2, the 3 or 4 described XDSL networks automatically, it is characterized in that described step B comprises:
On the user side unit, calculate each sub-carrier signal-noise ratio according to the sub-carrier signal that receives, and determine the bit number that can carry under each pattern according to described signal to noise ratio;
Perhaps,
To measure the information that obtains by the user side unit and send to the local side unit, according to each sub-carrier signal-noise ratio of described information calculations, and determine the bit number that can carry under each pattern according to described signal to noise ratio by the local side unit.
9, select the implementation method of operational mode in the XDSL network according to claim 5 automatically, it is characterized in that described step C also comprises:
C3, when selectable modes during more than 2 kinds, if in broadband pattern and narrow-band pattern according to relatively be with the Nepit increment and the band outside the bit increment, select current narrow-band pattern as the broadband pattern, then be adjacent than the narrow pattern of its frequency band range as the narrow-band pattern, carry out C1 and C2 again;
Or, when selecting current broadband pattern, then this broadband pattern is made as new narrow-band pattern, be adjacent than the wideer pattern of its frequency band range as the broadband pattern, carry out C1 and C2 again.
10, according to the implementation method of selecting operational mode in claim 1,2, the 3 or 4 described XDSL networks automatically, it is characterized in that described each pattern comprises:
Three kinds of patterns of second generation asymmetric digital subscriber line ADSL2+annex A of downlink bandwidth expansion, and/or second generation asymmetric digital subscriber line ADSL2 annex A, and/or the second generation asymmetric digital subscriber line READSL2 of extended distance, and/or second generation Very-high-speed Digital Subscriber Line VDSL2 (G.993.2).
11, according to the implementation method of selecting operational mode in claim 1,2, the 3 or 4 described XDSL networks automatically, it is characterized in that described method also comprises:
D, when DSL transceiver training is finished, execution in step A after determining corresponding operational mode, changes current operational mode to step C.
12, select the implementation method of operational mode in the XDSL network according to claim 11 automatically, it is characterized in that described step D comprises:
If with the signal C-Reverb calculated signals SNR of all carrier waves stack, then begin to change operational mode and corresponding frequency spectrum having modulated 4-QAM signal C-medley;
If with C-Medley calculated signals SNR, then in the back by bit and gain table bit﹠amp; Gaintable adjusts power spectrum to corresponding pattern, and corresponding operational mode information is transmitted in the message R-MSG2 of ustomer premises access equipment.
13, select the device of operational mode in a kind of XDSL network automatically, it is characterized in that, comprising:
The bearing capacity computing module: the sub-carrier signal that receives according to the user side unit calculates the signal to noise ratio of each subcarrier, and according to the bit number information that can carry under each pattern of described snr computation;
Mode selection module: the bit number that can carry under each pattern that calculating is determined according to the bearing capacity computing module is selected the operational mode between local side unit and user side unit, comprise: calculate under the broadband pattern that the bit number of part is more adjacent in the band under the narrow-band pattern with the narrow-band band in the difference of bit number of identical subcarrier set as increment in the band, but it is outer belong to the bit number of part under the broadband pattern in the broadband banding as increment outside the band also to calculate the narrow-band banding; When increment in the described band during greater than the outer increment of band, then select the narrow-band pattern, otherwise, selection broadband pattern.
14, select the system of operational mode in a kind of XDSL network automatically, comprise user side unit drawn game end unit, it is characterized in that, comprise the device of selecting operational mode in the aforesaid right requirement 13 described XDSL networks automatically, and also comprise:
Be arranged at the subcarrier sending module in the local side unit, be used for carrying out the transmission processing of subcarrier according to predetermined condition;
Be arranged at the measurement module in the user side unit, be used to measure subcarrier signals power and corresponding Background Noise Power, and offer described bearing capacity computing module.
15, select the system of operational mode in the XDSL network according to claim 14 automatically, it is characterized in that, the device of described automatic selection operational mode is arranged on user side unit or the local side unit, perhaps, is independent of the setting of user side unit drawn game end unit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101066948A CN100563290C (en) | 2005-09-26 | 2005-09-26 | Automatically select the implementation method and the device of operational mode in the XDSL network |
| PCT/CN2006/002492 WO2007033605A1 (en) | 2005-09-26 | 2006-09-22 | A method for achieving an automatic selection of operation modes in an xdsl network and the apparatus thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101066948A CN100563290C (en) | 2005-09-26 | 2005-09-26 | Automatically select the implementation method and the device of operational mode in the XDSL network |
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| CN1863259A CN1863259A (en) | 2006-11-15 |
| CN100563290C true CN100563290C (en) | 2009-11-25 |
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| CNB2005101066948A Expired - Fee Related CN100563290C (en) | 2005-09-26 | 2005-09-26 | Automatically select the implementation method and the device of operational mode in the XDSL network |
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| Country | Link |
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| CN (1) | CN100563290C (en) |
| WO (1) | WO2007033605A1 (en) |
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| CN101686067B (en) * | 2008-09-27 | 2013-08-28 | 华为技术有限公司 | Method, device and system for enhancing line stability |
| CN106464460B (en) | 2014-11-06 | 2019-09-03 | 华为技术有限公司 | Bit loading method, transmitting terminal, receiving end and the system of nonlinear precoding |
| CN110493478B (en) * | 2019-08-02 | 2021-02-09 | 深圳市普威技术有限公司 | Adaptive transmission mode xDSL equipment and system |
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| US6084881A (en) * | 1997-05-22 | 2000-07-04 | Efficient Networks, Inc. | Multiple mode xDSL interface |
| US5991311A (en) * | 1997-10-25 | 1999-11-23 | Centillium Technology | Time-multiplexed transmission on digital-subscriber lines synchronized to existing TCM-ISDN for reduced cross-talk |
| CN1602039A (en) * | 2004-10-27 | 2005-03-30 | 西安大唐电信有限公司 | Method of self-adaptive configuration for ultrahigh bit rate data client line rate |
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| WO2007033605A1 (en) | 2007-03-29 |
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