CN102137314A - Signal transmission method, device and system in digital subscriber line system - Google Patents
Signal transmission method, device and system in digital subscriber line system Download PDFInfo
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Abstract
The embodiment of the invention discloses a signal transmission method, a signal transmission device and a signal transmission system in a digital subscriber line system, which relate to the field of communication and solve the problem of symbol asynchronism. The technical scheme of the invention comprises the following steps of: receiving time information or phase information from network time source equipment; and transmitting a symbol according to the time information and a preset time interval or according to the phase information and the preset time interval. The signal transmission method, the signal transmission device and the signal transmission system in the digital subscriber line system provided by the embodiment of the invention can be applied to a network of communication between local side equipment and client equipment by an orthogonal frequency division multiplexing (OFDM) technology or a discrete multi-tone (DMT) technology.
Description
Technical field
The present invention relates to the communications field, relate in particular to signaling method, device and system in a kind of digital subscriber line system.
Background technology
(Digital Subscriber Line, DSL) technology is a kind of high speed transmission technology of carrying out transfer of data by twisted pair telephone to Digital Subscriber Line.DSL comprises ADSL (Asymmetric Digital Subscriber Line) (Asymmetrical DigitalSubscriber Line, A DSL), Very-high-speed Digital Subscriber Line (Very High Speed Digital SubscriberLine, VDSL) and the single line HDSL High-Speed Digital Subscriber Line (Single-pair High Speed DigitalSubscriber Line, SHDSL) etc.
When local side is communicated by letter by ADSL/VDSL with client, near-end cross NEXT and far-end cross talk FEXT can appear on the circuit, the frequency of the upward signal of ADSL/VDSL is different with the frequency of downstream signal, like this, in same network site, the frequency of transmitter transmission signal is different with the frequency of the signal that recipient receives, and has guaranteed that NEXT is smaller.On the other hand, ADSL/VDSL is for the far-end cross talk FEXT phenomenon between circuit, ADSL/VDSL realizes by the technology for eliminating of crosstalking, it realizes mainly being divided into three steps: channel estimating, crosstalk elimination and channel tracking and renewal, wherein channel tracking is estimated by interactive channel with renewal and is crosstalked to eliminate and realize, adapts to the circuit situation of continuous variation.As shown in Figure 1, adopt line access multiplexer the signal on a plurality of circuits to be managed concentratedly, obtain transmission signal on the adjacent lines and the transfer function of crosstalking between adjacent lines by channel estimating at local side; Eliminate by crosstalking on every circuit except that the signal of transmitting line self, also send the signal that obtains by the transfer function of crosstalking about the adjacent lines information of every circuit, offsetting crosstalking of adjacent lines at receiving terminal, thereby demodulate the signal on this circuit.
If two the ADSL/VDSL line work is at different frequency, perhaps the symbol on two ADSL/VDSL circuits is asynchronous, will cause in the orthogonality of the transmission of two circuits of identical network site and received signal destroyed, also can cause because the interference that receiver receives the transmitter of another circuit is not the interference signal of a complete symbol, and the spectrum leakage that causes causes NEXT to increase in the useful frequency spectrum of received signal.On the other hand, because the ADSL/VDSL line work is at different frequency, perhaps the symbol on the ADSL/VDSL circuit is asynchronous, also can cause between circuit crosstalk channels to estimate inaccurate.NEXT increase and circuit between crosstalk channels estimate that inaccurate meeting makes the error code of ADSL/VDSL link increase, and cause the deleterious of the crosstalk counteracting of technology such as VECTORED.
Summary of the invention
Signaling method in the digital subscriber line system that the embodiment of the invention provides, device and system are in order to solve the nonsynchronous problem of symbol.
For achieving the above object, the embodiment of the invention adopts following technical scheme:
Signaling method in a kind of digital user wire DSL system, described DSL system comprises at least two local side apparatus, described at least two local side apparatus send signal with the temporal information or the phase information of network time source device as reference information, and described method comprises step: receive temporal information or phase information from described network time source device; Send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval.
A kind of communicator, described communicator are used for comprising the digital user wire DSL system of at least two local side apparatus, and described communicator sends signal with the temporal information or the phase information of network time source device as reference information, and described communicator comprises:
Receiving element is used to receive temporal information or phase information from described network time source device;
Transmitting element is used for sending symbol according to described temporal information and default time interval or according to the described phase information and the default time interval.
A kind of symbol transmitting system, comprise network time source device and at least two local side apparatus, described network time, source device linked to each other with described two local side apparatus at least, and described at least two local side apparatus send symbol with the temporal information or the phase information of described network time source device as reference information;
Described local side apparatus is used to receive temporal information or phase information from described network time source device; Send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval.
Signaling method in the digital subscriber line system that the embodiment of the invention provides, device and system, owing to send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval, on the circuit symbol is arranged as long as make, described symbol can both be sent in the specific time, make the symbol on the circuit when sending, reach the purpose of sign synchronization.
Description of drawings
Fig. 1 is an ADSL/VDSL system reference model schematic diagram in the prior art;
The method flow diagram of the transmission symbol that Fig. 2 provides for the embodiment of the invention;
The method flow diagram one of the transmission symbol that Fig. 3 provides for further embodiment of this invention;
Fig. 4 is the composition schematic diagram of wall scroll signal;
The method flow diagram two of the transmission symbol that Fig. 5 provides for further embodiment of this invention;
The method flow diagram three of the transmission symbol that Fig. 6 provides for further embodiment of this invention;
The method flow diagram four of the transmission symbol that Fig. 7 provides for further embodiment of this invention;
Fig. 8 is the schematic diagram of transmission symbol between local side apparatus and the client device on the single line;
Fig. 9 is the schematic diagram of transmission symbol between local side apparatus and the client device on two circuits;
The method flow diagram one of the transmission symbol that Figure 10 provides for yet another embodiment of the invention;
The method flow diagram two of the transmission symbol that Figure 11 provides for yet another embodiment of the invention;
The method flow diagram three of the transmission symbol that Figure 12 provides for yet another embodiment of the invention;
The method flow diagram of the transmission symbol that Figure 13 provides for another embodiment of the present invention;
Figure 14 is for beating the sequential chart of two-way timestamp;
The structural representation one of the communicator that Figure 15 provides for the embodiment of the invention;
The structural representation two of the communicator that Figure 16 provides for the embodiment of the invention;
The structural representation three of the communicator that Figure 17 provides for the embodiment of the invention;
The structural representation four of the communicator that Figure 18 provides for the embodiment of the invention;
The structural representation five of the communicator that Figure 19 provides for the embodiment of the invention;
The structural representation one of the symbol transmitting system that Figure 20 provides for the embodiment of the invention;
The structural representation two of the symbol transmitting system that Figure 21 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
DSL system in embodiments of the present invention comprises at least two local side apparatus, and each local side apparatus is connected with at least one client device by circuit, and described local side apparatus and client device communicate by the xDSL technology.The problem that causes crosstalking between circuit and increase and influence the accuracy of crosstalk channels measurement between circuit owing to symbol is asynchronous when sending signal on the line in order to solve the DSL system that comprises at least two local side apparatus, the embodiment of the invention provides signaling method, device and the system in a kind of digital subscriber line system.
As shown in Figure 2, signaling method in the digital user wire DSL system that the embodiment of the invention provides, described DSL system comprises at least two local side apparatus, described at least two local side apparatus send symbol with the temporal information or the phase information of network time source device as reference information, and described method comprises:
In the present embodiment, described temporal information can be the concrete time in source of described network time, as 11: 59: 59 30 milliseconds.Described phase information can be included in the pulse signal of source transmission of described network time.
In the present embodiment, the described default time interval can be per 0.05 second transmission symbol after 12 integral points.
When receive be phase information the time, phase information can be with the form of pulse signal, send symbol according to the phase information and the default time interval, specifically can be when default phase place appears in described pulse signal, through default time interval transmission symbol, described default phase place can be the rising edge or the trailing edge of pulse signal, the default time interval can be 0 or other at interval etc.Certainly, between described default phase place rising edge that also can be described pulse signal and the trailing edge in the middle of constantly or the specific moment after the described pulse signal trailing edge.
In the present embodiment, described symbol can be OFDM (Orthogonal FrequencyDivision Multiplexing, OFDM) signal or Discrete multi-tone (Discrete Multi-Tone, DMT) signal.
Signaling method in the digital subscriber line system that the embodiment of the invention provides, owing to send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval, on the circuit symbol is arranged as long as make, described symbol can both be sent in the specific time, make the symbol on the circuit when sending, reach the purpose of sign synchronization.
In order to make those skilled in the art can more be expressly understood the technical scheme that the embodiment of the invention provides, the method for the transmission symbol that the embodiment of the invention is provided below by specific embodiment is elaborated.
As shown in Figure 3, signaling method in the DSL system that further embodiment of this invention provides, DSL system in further embodiment of this invention comprises at least two local side apparatus, each local side apparatus is connected with at least one client device by circuit, and described local side apparatus and client device communicate by the xDSL technology.Described at least two local side apparatus send symbol with the phase information of network time source device as reference information, and described method comprises:
In the present embodiment, comprise phase information in the described pulse signal.Described network time, source device can be comprehensive regularly (the Building Integrated Timing System of (supply) system in building, BITS), BITS can provide described pulse signal with the form of single-wire signal, as shown in Figure 4, described single-wire signal is formed by 4 sections: a (per second pulse PPS section)+b (waiting for section)+c (Serial Port Information point)+d (free segment).Wherein, the baud rate of serial ports is X, as, Gigabit Passive Optical Network (Gigabit-Capable Passive OpticalNetwork, baud rate GPON) is 1024000, the initial of serial ports stops each one, the no parity check sign indicating number.The PPS section of described single-wire signal is exactly described pulse signal.
In the present embodiment, the default time interval can be 0, and described default phase place can be the rising edge or the trailing edge of described pulse signal.According to described pulse signal and default phase place, the beginning transmitting time point of described symbol is the rising edge or the trailing edge of described pulse signal.
Optionally, the default time interval also can be other default interval, particular moment in the middle of between rising edge that described default phase place also can be described pulse signal and the trailing edge after the trailing edge of the moment or described pulse signal, as, get access to described pulse signal trailing edge 0.05s afterwards.
What deserves to be explained is, in the middle of between rising edge that described default phase place is described pulse signal and the trailing edge constantly or during the particular moment after the trailing edge of described pulse signal, signaling method in the DSL system that the embodiment of the invention provides, as shown in Figure 5, before the described step 307, also comprise:
Further, in order to keep the synchronism of transmission symbol on the circuit between local side apparatus and the client device, the signaling method in the described DSL system as shown in Figure 6, also comprised before described step 307:
In the present embodiment, described operating frequency with local work clock is the frequency of network source device synchronously, comprise: the network information of obtaining is carried out frequency division, frequency multiplication or phase-locked, and the frequency that processing is obtained is as the operating frequency of the local work clock of described local side or client device.
In the present embodiment, because the operating frequency of described work clock determines the symbol period of described symbol, when described each local side apparatus, when the operating frequency of the work clock of each client device is identical, the symbol period of the described symbol that sends under identical operating frequency also is identical, n (n＞0 in the described symbol, n rounds) after individual symbol sends, the back of described n symbol is followed by n+1 symbol, be that described symbol is to send continuously when time point reaches, because each local side apparatus, the operating frequency of the work clock of each client device is identical, make each local side apparatus, the symbol period of each client device symbol is identical, thus kept the symbol that transmits on the circuit between described local side apparatus and the client device synchronously.
Further, because when sending symbol, can not be totally continuous between symbol and the symbol, eliminate intersymbol interference in the symbol that on the circuit that keeps between local side apparatus and the client device, transmits synchronous, signaling method in the described DSL system, as shown in Figure 7, before described step 302, also comprise:
In the present embodiment; described cyclic extensions comprises Cyclic Prefix and cyclic suffix; be used to prevent intersymbol interference and can eliminate intersymbol interference; as shown in Figure 8; the discontinuous part that sends symbol on the circuit is limited within the recycling-guard CE; information in the described CE will directly be cast out when carrying out modulation, and intersymbol interference just in time is within the CE, so eliminated the intersymbol interference on the circuit.
In the present embodiment, the cyclic extensions length of described symbol is set by described cyclic extensions length value, as shown in Figure 9, make that the CE on every circuit is identical, under the situation of sign synchronization, CE alignment on every circuit, make the discontinuous part that sends symbol on the circuit 1 to the interference-limited of circuit 2 receiving symbols within CE.Thereby suppressed of the interference of the discontinuous part of symbol, promptly suppressed near-end cross the All other routes receiver.Simultaneously, because the length of CE is identical, after giving up the CE internal information, the symbol that circuit is seen is still synchronous.
Signaling method in the digital subscriber line system that the embodiment of the invention provides, device and system, owing to send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval, on the circuit symbol is arranged as long as make, described symbol can both be sent in the specific time, make the symbol on the circuit when sending, reach the purpose of sign synchronization.Further, because the symbol on the circuit transmits on the line and reaches sign synchronization, make near-end cross diminish, crosstalk channels is stable, crosstalk channels is estimated accurately, solved because the problem that the asynchronous near-end cross that causes of symbol increases between difference and circuit between symbol sampler between circuit, further having solved symbol again, asynchronous to cause crosstalk channels to be measured inaccurate, makes the problem of deleterious of the technology for eliminating of crosstalking such as VECTORED between circuit.
As shown in figure 10, signaling method in the DSL system that yet another embodiment of the invention provides, DSL system in yet another embodiment of the invention comprises at least two local side apparatus, each local side apparatus is connected with at least one client device by circuit, and described local side apparatus and client device communicate by the xDSL technology.Described at least two local side apparatus send symbol with the phase information of network time source device as reference information, and described method comprises:
In the present embodiment, the described default time interval can be the whole second moment corresponding to temporal information, as, the temporal information that described local side or client device receive be 11: 59: 59 30 milliseconds, then described local side or client device can obtain time point position 12 integral points that local side or client device send symbol, 12: 01 seconds, 12: 02 seconds etc. according to the described time interval and temporal information.
Before step 1007, can also comprise:
Further, in order to keep the synchronism of transmission symbol on the circuit between local side apparatus and the client device, the signaling method in the described DSL system as shown in figure 11, also comprises before the described step 1007:
Further, because when sending symbol, can not be totally continuous between symbol and the symbol, eliminate intersymbol interference in the symbol that on the circuit that keeps between local side apparatus and the client device, transmits synchronous, signaling method in the described DSL system, as shown in figure 12, before described step 1002, also comprise:
Step 1003, local side or client device are obtained the cyclic extensions length value that sets in advance.Described step 1003 is identical with the specific implementation of step 303 described in the foregoing description, repeats no more herein.
Step 1004, local side or client device are provided with the cyclic extensions length of described symbol according to described cyclic extensions length value.Described step 1004 is identical with the specific implementation of step 304 described in the foregoing description, repeats no more herein.
Signaling method in the digital subscriber line system that the embodiment of the invention provides, device and system, owing to send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval, on the circuit symbol is arranged as long as make, described symbol can both be sent in the specific time, make the symbol on the circuit when sending, reach the purpose of sign synchronization.Further, because the symbol on the circuit transmits on the line and reaches sign synchronization, make near-end cross diminish, crosstalk channels is stable, crosstalk channels is estimated accurately, solved because the problem that the asynchronous near-end cross that causes of symbol increases between difference and circuit between symbol sampler between circuit, further having solved symbol again, asynchronous to cause crosstalk channels to be measured inaccurate, makes the problem of deleterious of the technology for eliminating of crosstalking such as VECTORED between circuit.
As shown in figure 13, the method of the transmission symbol that another embodiment of the present invention provides, DSL system in another embodiment of the present invention comprises at least two local side apparatus, each local side apparatus is connected with at least one client device by circuit, and described local side apparatus and client device communicate by the xDSL technology.Described at least two local side apparatus send symbol with the phase information of network time source device as reference information, and described method comprises:
Step 1301, local side apparatus are obtained the frequency information of network source device.
Step 1302, described local side apparatus is the frequency of network source device according to described frequency information with the operating frequency of local work clock synchronously.
Step 1303, local side apparatus are obtained the cyclic extensions length value that sets in advance.
Step 1304, local side apparatus are provided with the cyclic extensions length of symbol according to described cyclic extensions length value.
Step 1305, local side apparatus receive temporal information or the phase information from described network time source device.
Step 1306, local side apparatus sends described symbol according to described temporal information or phase information and the default time interval.
Step 1307, client device shift to an earlier date by the time that (Time Advanced, TA) mechanism makes client device send symbol when local side apparatus sends symbol.
In order to make those skilled in the art better understand technical scheme, existing with regard to TA mechanism detailed description.Described TA mechanism is that lead identical with propagation delay time of introducing makes client device must send the sign synchronization of signal and received signal on the signal by sending at client device.The specific implementation method of described TA mechanism has a variety of, comprise by beating two-way timestamp and realize that client device sends symbol when local side apparatus sends symbol, as shown in figure 14, describedly realize that by beating two-way timestamp client device sends symbol and comprises two stages when local side apparatus sends symbol:
Phase I is the time deviation of revising between local side apparatus work clock and the client device work clock, is called drift and measures.In the process of revising drift value, the local side apparatus work clock periodically sends sync message to corresponding client device work clock according to the blanking time (the default 2s of being) of definition, and this sync message comprises that this message leaves the time estimated value of local side apparatus work clock.The local side apparatus work clock is measured the correct time Tm1 that transmits, the client device work clock is measured the correct time Ts1 that receives, the local side apparatus work clock sends the second message afterwards--follow message, this message is associated with sync message, and comprises sync message and be put into more accurate estimated value on the communication path.Like this, can separate the propagation of transmission and measurement that receives and standard time stamp.
Second stage is delay measurements, and the client device work clock sends one to the local side apparatus work clock and postpones the request msg message, and this message of decision transmits correct time Ts2 in this process.The local side apparatus work clock is stamped a time stamp T m2 to receiving packet, in the delayed response packet time of reception stamp is sent back to the client device work clock then.The time of reception that stabs Ts2 and local side equipment work clock and provide according to passing time stabs Tm2, the client device work clock calculate and the local side apparatus work clock between time of delay.Different with offset measurement, irregular carrying out during delay measurements, it is big that its interval time of measurement ratio deviation interval time of measurement is wanted.Especially the load of device end is not too large to make network like this.
Suppose that Offset is the deviation of client device work clock and local side equipment work clock, Delay1 is the path delay of local side apparatus work clock to the client device work clock, Delay2 is the path delay of client device work clock to the local side apparatus work clock, according to Figure 14 as can be known:
Ts0＝Tm1+Offset
Ts1-Ts0＝Delay1
So: Offset=Ts1-Tm1-Delay1 (1)
In like manner, Tm2=Ts2-Offset+Delay2
Draw Offset=Ts2-Tm2+Delay2 (2)
If the time-delay of both direction equates, i.e. Delay1=Delay2, so
Offset＝(Ts1+Ts2-Tm1-Tm2)/2 (3)
The deviation of client device work clock and local side equipment work clock obtains according to above-mentioned formula (3), realized that the client device work clock is synchronized to the local side apparatus work clock, made described client device and described local side apparatus send the sign synchronization of signal.
Signaling method in the digital subscriber line system that the embodiment of the invention provides, owing to send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval, on the circuit symbol is arranged as long as make, described symbol can both be sent in the specific time, make the symbol on the circuit when sending, reach the purpose of sign synchronization.Further, because the symbol on the circuit transmits on the line and reaches sign synchronization, make near-end cross diminish, crosstalk channels is stable, crosstalk channels is estimated accurately, solved because the problem that the asynchronous near-end cross that causes of symbol increases between difference and circuit between symbol sampler between circuit, further having solved symbol again, asynchronous to cause crosstalk channels to be measured inaccurate, makes the problem of deleterious of the technology for eliminating of crosstalking such as VECTORED between circuit.
As shown in figure 15, the communicator that the embodiment of the invention provides is used for comprising at least the DSL system of two local side apparatus, it is characterized in that, comprising:
Receiving element 1501 is used to receive temporal information or phase information from the network time source device; Concrete implementation method can be described referring to step 201 as shown in Figure 2, repeats no more herein, and the phase information in the present embodiment can send with the form of pulse signal.
Transmitting element 1502 is used for sending symbol according to described temporal information and default time interval or according to the described phase information and the default time interval.Concrete implementation method can be described referring to step 202 as shown in Figure 2, repeats no more herein.
As shown in figure 16, further, described device also comprises:
Further, as shown in figure 17, when the phase information that receives was the form of pulse signal, described communicator also comprised at described receiving element:
Further, in order to keep the synchronism of transmission symbol on the circuit between local side apparatus and the client device, as shown in figure 18, described communicator also comprises:
First acquiring unit 1801 is used to obtain the frequency information of network source device; Concrete implementation method can be described referring to step 304 as shown in Figure 6, repeats no more herein.
Further, during owing to the transmission symbol, can not be totally continuous between symbol and the symbol, eliminate intersymbol interference in the symbol that on the circuit that keeps between local side apparatus and the client device, transmits synchronous, as shown in figure 19, described communicator also comprises:
Second acquisition unit 1901 is used to obtain the cyclic extensions length value that sets in advance; Concrete implementation method can be described referring to step 306 as shown in Figure 7, repeats no more herein.
The communicator that the embodiment of the invention provides, because transmitting element sends symbol according to described temporal information and default time interval or according to the described phase information and the default time interval, on the circuit symbol is arranged as long as make, described symbol can both be sent in the specific time, make the symbol on the circuit when sending, reach the purpose of sign synchronization.Further, because the symbol on the circuit transmits on the line and reaches sign synchronization, make near-end cross diminish, crosstalk channels is stable, crosstalk channels is estimated accurately, solved because the problem that the asynchronous near-end cross that causes of symbol increases between difference and circuit between symbol sampler between circuit, further having solved symbol again, asynchronous to cause crosstalk channels to be measured inaccurate, makes the problem of deleterious of the technology for eliminating of crosstalking such as VECTORED between circuit.
As shown in figure 20, the symbol transmitting system that the embodiment of the invention provides comprises network time source device 2001 and at least two local side apparatus 2002, described network time, source device 2001 linked to each other with described two local side apparatus 2002 at least, described at least two local side apparatus 2002 with described network time source device 2001 temporal information or phase information send symbol as reference information;
Described local side apparatus 2001 is used to receive temporal information or phase information from described network time source device; Send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval.
In the present embodiment, the structure of the described communicator of Figure 15-19 is identical with the specific implementation method in described local side apparatus and the foregoing description, repeats no more herein.
Further, as shown in figure 21, described local side apparatus 2002 also is used to obtain the frequency information in network source 2003, according to the synchronous local work clock of described frequency information.Concrete implementation method can be described referring to step 304 as shown in Figure 6 and step 305, repeats no more herein.
The symbol transmitting system that the embodiment of the invention provides, owing to send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval, on the circuit symbol is arranged as long as make, described symbol can both be sent in the specific time, make the symbol on the circuit when sending, reach the purpose of sign synchronization.Further, because the symbol on the circuit transmits on the line and reaches sign synchronization, make near-end cross diminish, crosstalk channels is stable, crosstalk channels is estimated accurately, solved because the problem that the asynchronous near-end cross that causes of symbol increases between difference and circuit between symbol sampler between circuit, further having solved symbol again, asynchronous to cause crosstalk channels to be measured inaccurate, makes the problem of deleterious of the technology for eliminating of crosstalking such as VECTORED between circuit.
Signaling method, device and system in the DSL system that the embodiment of the invention provides can be applied in the network that local side apparatus and client device communicate by OFDM or DMT technology.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer-readable recording medium, as ROM/RAM, magnetic disc or CD etc.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, 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 described claim.
Claims (10)
1. the signaling method in the digital user wire DSL system, described DSL system comprises at least two local side apparatus, it is characterized in that described at least two local side apparatus send signal with the temporal information or the phase information of network time source device as reference information, described method comprises step:
Reception is from the temporal information or the phase information of described network time source device;
Send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval.
2. method according to claim 1 is characterized in that, when the information when being phase information from described network time source device, described phase information is a pulse signal, describedly sends symbol according to described phase information and the default time interval and is specially:
When default phase place occurring on the described pulse signal, through default time interval transmission symbol.
3. method according to claim 2 is characterized in that, describedly also comprises before sending symbol according to described phase information and default time interval:
With local work clock zero clearing and described local work clock is picked up counting.
4. method according to claim 3 is characterized in that, describedly also comprises before sending symbol according to described phase information and default time interval:
Obtain the frequency information in network source;
According to the synchronous local work clock of described frequency information.
5. method according to claim 4 is characterized in that, describedly also comprises before sending symbol according to described phase information and default time interval:
Obtain the cyclic extensions length value that sets in advance;
The cyclic extensions length of described symbol is set according to described cyclic extensions length value.
6. method according to claim 1 is characterized in that, when the information when being temporal information from described network time source device, describedly also comprises before sending symbol according to described temporal information and the default time interval:
Adjust the time of local work clock according to described temporal information.
7. communicator, described communicator is used for comprising the digital user wire DSL system of at least two local side apparatus, it is characterized in that described communicator sends signal with the temporal information or the phase information of network time source device as reference information, described communicator comprises:
Receiving element is used to receive temporal information or phase information from described network time source device;
Transmitting element is used for sending symbol according to described temporal information and default time interval or according to the described phase information and the default time interval.
8. device according to claim 7 is characterized in that, described device also comprises:
First lock unit is used for according to the synchronous local work clock of described temporal information.
9. symbol transmitting system, comprise network time source device and at least two local side apparatus, described network time, source device linked to each other with described two local side apparatus at least, it is characterized in that described at least two local side apparatus send symbol with the temporal information or the phase information of described network time source device as reference information;
Described local side apparatus is used to receive temporal information or phase information from described network time source device; Send symbol according to described temporal information and default time interval or according to the described phase information and the default time interval.
10. system according to claim 9 is characterized in that described local side apparatus also is used to obtain the frequency information in network source, according to the synchronous local work clock of described frequency information.
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| CN102137314B (en) | 2015-07-08 |
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