CN108270500A - A kind of method for synchronizing time and device - Google Patents
A kind of method for synchronizing time and device Download PDFInfo
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- CN108270500A CN108270500A CN201611254744.1A CN201611254744A CN108270500A CN 108270500 A CN108270500 A CN 108270500A CN 201611254744 A CN201611254744 A CN 201611254744A CN 108270500 A CN108270500 A CN 108270500A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0261—Optical medium access at the optical multiplex section layer
- H04J14/0263—Multiplex section layer wavelength assignment algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- Computer Networks & Wireless Communication (AREA)
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- Optical Communication System (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The present invention provides a kind of method for synchronizing time and device, this method include：Each slave device network node is established to the transmission path of master network node so that the corresponding a length of mutually different optical wavelength of light wave of each transmission path；The synchronizing information of each slave device network node is controlled to load on the optical wavelength signal of corresponding optical wavelength, and be transmitted on the transmit path；Wherein, when the network node that transmission path is passed through includes master network node, slave device network node and an at least middleware network node, during optical wavelength signal transmits, middleware network node forwards the optical wavelength signal received in photosphere.Since the middleware network node of transmission path is when receiving the optical wavelength signal for carrying synchronizing information, it need not carry out photoelectric conversion processing, the optical wavelength signal directly is forwarded in photosphere, so as to which middleware network node is avoided to carry out the time error that photoelectric conversion processing introduces to optical wavelength signal.
Description
Technical field
The present invention relates to Internet technical field more particularly to a kind of method for synchronizing time and device.
Background technology
The mobile communication system such as TD-SCDMA, CDMA2000, TD-LTE have time synchronization demand, are needed between base station full
The time synchronization of sufficient Microsecond grade, no it will cause base station interference, call connection can not establish.It is asked to solve time synchronization
Topic, precise synchronization network set time server in upstream, are transmitted step by step via intermediate node, by temporal information
Distribution is supplied to end base station.Time transportation protocol generally use IEEE PTP (exact time synchronization) agreement.
In the prior art, synchronizing network is when by every grade of intermediate node handles, intermediate node extraction time sync message,
Time deviation is calculated in processing, for adjusting this node time, and generates new time synchronization message and downstream sends, each
Time error can be introduced during node processing, therefore, time error accumulation is larger after multihop network transmits.According to existing
There are ITU-T G.8273.2 standards, often jump the time error of intermediate node introducing in tens nanosecond orders, then by network
It is difficult the required precision for meeting hundred nanoseconds after transmission.Therefore existence time synchronization accuracy is poor in existing method for synchronizing time
The technical issues of.
Invention content
The embodiment of the present invention provides a kind of method for synchronizing time and device, is asked with solving the poor technology of timing tracking accuracy
Topic.
In a first aspect, an embodiment of the present invention provides a kind of method for synchronizing time, apply in synchronous transmission network, wrap
It includes：
Each slave device network node is established to the transmission path of master network node so that each transmission path pair
The a length of mutually different optical wavelength of light wave answered；
The synchronizing information of each slave device network node is controlled to load on the optical wavelength signal of corresponding optical wavelength, and in institute
It states and is transmitted in transmission path so that the slave device network node can carry out time synchronization tune according to the synchronizing information
It is whole；
Wherein, when the network node that the transmission path is passed through includes the master network node, slave device network
When node and at least a middleware network node, during the optical wavelength signal transmits, the middleware network
Node forwards the optical wavelength signal received in photosphere.
Second aspect, the embodiment of the present invention also provide a kind of method for synchronizing time, apply the second of synchronous transmission network
In device network node, including：
The optical wavelength signal that the transmission of master network node carries synchronizing information is received, is set based on the optical wavelength signal
The signal that the transmission path of standby network node to the second device network node is transmitted, and the transmission path has independent light
Wavelength；
When the second device network node is the endpoint node of the transmission path, carried out according to the synchronizing information
Time synchronization adjusts；
When the second device network node is the middleware network node of the transmission path, according to the transmission
Optical wavelength signal described in path clustering is forwarded in photosphere.
The third aspect, the embodiment of the present invention also provide a kind of time synchronism apparatus, apply in synchronous transmission network, packet
It includes：
Module is established in path, for establishing each slave device network node to the transmission path of master network node so that
The corresponding a length of mutually different optical wavelength of light wave of each transmission path；
Control module, for controlling the loading of the synchronizing information of each slave device network node in the optical wavelength of corresponding optical wavelength
It on signal, and is transmitted on the transmit path so that the slave device network node can be according to the synchronizing information
Carry out time synchronization adjustment；
Wherein, when the network node that the transmission path is passed through includes the master network node, slave device network
When node and at least a middleware network node, during the optical wavelength signal transmits, the middleware network
Node forwards the optical wavelength signal received in photosphere.
Fourth aspect, the embodiment of the present invention also provide a kind of time synchronism apparatus, apply the second of synchronous transmission network
In device network node, including：
Receiving module, for receiving the optical wavelength signal that the transmission of master network node carries synchronizing information, the light
The signal that wavelength signals are transmitted by the transmission path of master network node to the second device network node, and the transmission road
Diameter has independent optical wavelength；
Adjust module, for when the second device network node be the transmission path endpoint node when, according to institute
It states synchronizing information and carries out time synchronization adjustment；
Forwarding module, for working as the middleware network node that the second device network node is the transmission path
When, the optical wavelength signal is controlled to be forwarded in photosphere according to the transmission path.
In this way, in the embodiment of the present invention, each slave device network node is established to the transmission path of master network node, is made
Obtain the corresponding a length of mutually different optical wavelength of light wave of each transmission path；Control the synchronization of each slave device network node
Information loading is transmitted on the transmit path on the optical wavelength signal of corresponding optical wavelength so that the slave device
Network node can carry out time synchronization adjustment according to the synchronizing information；Wherein, when the network that the transmission path is passed through
When node includes the master network node, slave device network node and an at least middleware network node, in the light
During wavelength signals are transmitted, middleware network node forwards the optical wavelength signal received in photosphere.Due to
In the transmission process of synchronizing information, independent optical wavelength is provided with, therefore slave device network node can be direct to synchronizing information
Extraction carries the optical wavelength signal of synchronizing information, and obtains synchronizing information, so as to shorten the time of synchronizing information acquisition,
The difficulty for obtaining synchronizing information is reduced, reduces time calculating error.At the same time, for the middleware network section of transmission path
Point, without carrying out photoelectric conversion processing, directly forwards the light when receiving the optical wavelength signal for carrying synchronizing information in photosphere
Wavelength signals, so as to which middleware network node is avoided to carry out the time mistake that photoelectric conversion processing introduces to optical wavelength signal
Difference.Therefore the present invention improves the precision of time synchronization, due to only in the master network node of transmission path and slave device net
Network node introduces error, therefore can meet the required precision of hundred nanoseconds.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention,
For those of ordinary skill in the art, without having to pay creative labor, it can also be obtained according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow chart for the method for synchronizing time that first embodiment of the invention provides；
Fig. 2 is the network architecture schematic diagram of method for synchronizing time application provided by the invention；
Fig. 3 is one of signal transmission schematic diagram of middleware network node of method for synchronizing time provided by the invention；
Fig. 4 is the two of the signal transmission schematic diagram of the middleware network node of method for synchronizing time provided by the invention；
Fig. 5 is one of time synchronizing method schematic diagram of method for synchronizing time provided by the invention；
Fig. 6 is the two of the time synchronizing method schematic diagram of method for synchronizing time provided by the invention；
Fig. 7 is the flow chart for the method for synchronizing time that second embodiment of the invention provides；
Fig. 8 is the structure chart for the time synchronism apparatus that third embodiment of the invention provides；
Fig. 9 is the structure chart for the time synchronism apparatus that fourth embodiment of the invention provides.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is part of the embodiment of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
First embodiment
Referring to Fig. 1, Fig. 1 is the flow chart of method for synchronizing time provided in an embodiment of the present invention, which should
In synchronous transmission network, as shown in Figure 1, including the following steps：
Step 101, each slave device network node is established to the transmission path of master network node so that each biography
The corresponding a length of mutually different optical wavelength of light wave in defeated path；
Method for synchronizing time provided in this embodiment is mainly used in synchronous transmission network, for synchronous transmission network
In each network node carry out time synchronization.
Specifically, above-mentioned master network node can be synchronous transmission network among a node or when
Between benchmark source device；Above-mentioned slave device network node is any one node in synchronous transmission network.Due to carrying out the time
When synchronous, it usually needs each slave device network node carries out time synchronization, therefore in this implementation with master network node
In example, need to establish each slave device network node to the transmission path of master network node.
It should be noted that synchronous transmission network includes master network node and the second device network node, described the
Two device network nodes include slave device network node and middleware network node, and wherein slave device network node is for root
The endpoint node on the node namely transmission path of time synchronization is carried out according to the synchronizing information in optical wavelength signal；Intermediate equipment
Network node is the intermediate node in the node being forwarded to optical wavelength signal namely above-mentioned transmission path.At one
In transmission path, can only include master network node and slave device network node, can also include master network node,
Slave device network node and at least one middleware network node.
As shown in Fig. 2, in synchronous transmission network, including master network node N1, the second device network node N2,
Two device network node N3, the second device network node N4 and the second device network node N5.It can be with to this synchronous transmission network
4 transmission paths are established, are respectively：N2 to N1, N3 to N1, N4 to N1 and N5 to N1.
In the step, after above-mentioned transmission path is established, each transmission path is corresponding with independent optical wavelength.For example, road
The light wave a length of λ 4, path N4 to N1 of the light wave a length of λ 2, path N5 to N1 of the light wave a length of λ 1, path N3 to N1 of diameter N2 to N1
The a length of λ 4 of light wave.Wherein λ 1, λ 2, the value of λ 3 and λ 4 are unequal.
Step 102, the synchronizing information of each slave device network node is controlled to load in the optical wavelength signal for corresponding to optical wavelength
On, and be transmitted on the transmit path so that the slave device network node can be carried out according to the synchronizing information
Time synchronization adjusts；
Wherein, when the network node that the transmission path is passed through includes the master network node, slave device network
When node and at least a middleware network node, during the optical wavelength signal transmits, middleware network node
The optical wavelength signal received is forwarded in photosphere.
Above-mentioned synchronizing information includes the synchronizing information that master network node sent to slave device network node and from setting
The synchronization message that standby network node is sent to master network node.
It can send control signaling in the present embodiment or by configuration file HRP-configured master device and each slave device to same
The transmission mode of information is walked, so that optical wavelength of the synchronizing information loading of each slave device network node in corresponding optical wavelength
On signal, and it is transmitted on the transmit path.
For example, only comprising master network node N1 and slave device network node N2, above-mentioned road in above-mentioned path N2 to N1
Master network node N1, middleware network node N2 and slave device network node N3 are included in diameter N3 to N1.
Master network node to each second device network node when sending synchronizing information, the second device network node N2
Synchronizing information can load and be transmitted in the optical wavelength signal of a length of λ 1 of light wave, the synchronization of the second device network node N3
Information can be loaded to be transmitted in the optical wavelength signal of a length of λ 2 of light wave.At this point, the second device network node N2 is received
During the optical wavelength signal of a length of λ 1 of light wave, Electric signal processing will be converted into optical wavelength signal, be taken so as to obtain optical wavelength signal
The synchronizing information of band, and time synchronizing is carried out according to the synchronizing information；Second device network node N2 receives optical wavelength
During optical wavelength signal for λ 2, it will the optical wavelength signal is directly forwarded to the second device network node N3 in photosphere, second
When device network node N3 receives the optical wavelength signal of a length of λ 2 of light wave, Electric signal processing will be converted into optical wavelength signal,
So as to obtain the synchronizing information of optical wavelength signal carrying, and time synchronizing is carried out according to the synchronizing information.
In this way, in the embodiment of the present invention, each slave device network node is established to the transmission path of master network node, is made
Obtain the corresponding a length of mutually different optical wavelength of light wave of each transmission path；Control the synchronization of each slave device network node
Information loading is transmitted on the transmit path on the optical wavelength signal of corresponding optical wavelength so that the slave device
Network node can carry out time synchronization adjustment according to the synchronizing information；Wherein, when the network that the transmission path is passed through
When node includes the master network node, slave device network node and an at least middleware network node, in the light
During wavelength signals are transmitted, the middleware network node forwards the optical wavelength signal received in photosphere.
Due in the transmission process of synchronizing information, it is provided with independent optical wavelength to synchronizing information, therefore slave device network node can be with
Directly extraction carries the optical wavelength signal of synchronizing information, and obtains synchronizing information, so as to shorten synchronizing information acquisition
Time reduces the difficulty for obtaining synchronizing information, reduces time calculating error.At the same time, for the intermediate equipment of transmission path
Network node is when receiving the optical wavelength signal for carrying synchronizing information, without carrying out photoelectric conversion processing, directly turns in photosphere
The optical wavelength signal is sent out, so as to which middleware network node is avoided to carry out what photoelectric conversion processing introduced to optical wavelength signal
Time error.Therefore the present invention improves the precision of time synchronization, due to only the master network node of transmission path and from
Device network node introduces error, therefore can meet the required precision of hundred nanoseconds.
Further, the control mode for optical wavelength signal forwarding being carried out for control middleware network node can basis
Actual needs is configured, and will be described in detail below with two different implementations.
For example, referring to Fig. 3, above-mentioned middleware network node forwards the optical wavelength signal received in photosphere and wraps
It includes：
Based on optical multiplexer/demultiplexer in the middleware network node so that the optical wavelength signal is in the intermediate equipment
It is led directly in network node.
As shown in figure 3, in the present embodiment, optical multiplexer/demultiplexer and electric treatment list are equipped in middleware network node
Member a, wherein optical multiplexer/demultiplexer is used to receive the optical wavelength signal of upstream network node transmission or upstream network node sends light
Wavelength signals, another optical multiplexer/demultiplexer is used to receive the optical wavelength signal of downstream network node transmission or downstream network node is sent out
Send optical wavelength signal.
Optical multiplexer/demultiplexer can be configured in the present embodiment, when the optical wavelength signal for receiving specific wavelength of light,
The optical wavelength signal in middleware network node is realized and is led directly to.I.e. in the optical wavelength for receiving the transmission of upstream network node
During signal, which can be transmitted directly to another optical multiplexer/demultiplexer, and another optical multiplexer/demultiplexer is forwarded directly to
Downstream network node.Repeating process further for the optical wavelength signal of downstream network node upstream network node transmission is one
It causes, details are not described herein.
With reference to Fig. 4, above-mentioned middleware network node includes the optical wavelength signal received in photosphere forwarding：
Based on bifurcated multiplexing (OADM Optical Add-Drop Multiplexer) in the middleware network node
Device carries out the dynamic dispatching of wavelength so that optical wavelength signal is led directly in the middleware network node.
As shown in figure 4, using ROADM (Reconfigurable Optical are equipped in middleware network node
Add-Drop Multiplexer, reconfigurable optical add/drop multiplexer), it is configured by the way that ROADM is configured, control ROADM is carried out
The dynamic dispatching of wavelength so that optical wavelength signal is led directly in the middleware network node.It should be understood that the present embodiment is to light
The processing of wavelength signals refers to the processing of the optical wavelength signal to carrying above-mentioned synchronizing information, for the processing of other optical wavelength
Mode can be handled according to existing mode.
It should be noted that in the present embodiment, the optical wavelength signal transmitted in above-mentioned transmission path is in addition to carrying
The optical wavelength signal of synchronizing information can also include the optical wavelength signal of other business.That is, it in the present embodiment, is passed for synchronous
The wavelength sent can carry other business simultaneously in the case where not influencing synchronous service on the wavelength.For example, synchronizing information
It is carried by PTP Ethernet messages, the Ethernet message of other business can be carried simultaneously on the wavelength.
Further, in order to reduce the error that uplink downlink delay asymmetry introduces, above-mentioned optical wavelength is used for transmission
The transmission mode of the radio frequency channel of the optical wavelength signal includes single fiber bi-directional pattern.
I.e. in the present embodiment, to above-mentioned transmission path, individually one forward direction of distribution transmits optical wavelength and back transfer light wave
Long, wherein the positive transmission transmitted optical wavelength and be used for positive synchronizing information, back transfer optical wavelength is for reverse sync information
It transmits, and positive synchronizing information and reverse sync information are transmitted in same optical fiber, during so as to avoid synchronizing,
The error that uplink downlink delay asymmetry introduces.It is understood that other than the wavelength where synchronizing information, other industry
Wavelength where business still may be used double-fiber two-way mode and be transmitted.
Further, it can be set according to actual needs for synchronizing the mode of transmission in synchronous transmission network
It puts.Such as in first scheme, the mode that bi-directional synchronization message may be used carries out slave device network node and master network
The time synchronization of node in alternative plan, can also use record link delay information, pass through master network node-node transmission
The mode of temporal information carries out time synchronization, this is described in detail below.
In first scheme, above-mentioned synchronizing information includes bi-directional synchronization message, and the bi-directional synchronization message is for described in confession
Slave device network node calculates the reporting with master network node according to the bi-directional synchronization message, and carries out the time
Synchronous adjustment.
As shown in figure 5, it can periodically be carried out between master network node and slave device network node two-way same
Message interaction is walked, so as to calculate the time with master network node according to the bi-directional synchronization message by slave device network node
Deviation, and time synchronization adjustment is periodically carried out, so as to reach between slave device network node and master network node
Time synchronization.
In alternative plan, above-mentioned synchronizing information includes the synchronization that master network node is sent to slave device network node
Temporal information, information synchronization time are used for for the slave device network node according to information synchronization time and the biography
The link delay information in defeated path carries out time synchronization adjustment.
As shown in fig. 6, since middleware network node does not make electric treatment, link delay substantially constant, therefore obtain first
Take the link delay information.Specifically, link delay information can be obtained by bi-directional interactive mode, it can also be passed through
He obtains link delay information at mode (such as calculating linkage length by OTDR), not further herein to be limited.It is obtaining
To after link delay information, slave device network node will store the link delay information, and receive master network section
During information synchronization time of point periodicity sending, slave device network section is adjusted according to synchronization time information and link delay information
The point time of itself, so as to reach the time synchronization between slave device network node and master network node.
It should be understood that can be configured according to actual needs for the sending method of information synchronization time, such as can lead to
It crosses message to carry information transmission synchronization time or can be sent by pulse signal carrying temporal information, utilizes pulse
Rising edge or failing edge the instruction time information of signal, so as to further avoid the time error that Message processing is brought.
Second embodiment
Referring to Fig. 7, Fig. 7 is the flow chart of method for synchronizing time provided in an embodiment of the present invention, which should
In the second device network node of synchronous transmission network, as shown in fig. 7, comprises following steps：
Step 701, the optical wavelength signal that the transmission of master network node carries synchronizing information, the light wave long letter are received
Number signal transmitted by the transmission path of master network node to the second device network node, and the transmission path has
Independent optical wavelength；
Step 702, when the second device network node is the endpoint node of the transmission path, according to the synchronization
Information carries out time synchronization adjustment；
Step 703, when the second device network node is the middleware network node of the transmission path, according to
The transmission path controls the optical wavelength signal to be forwarded in photosphere.
In the present embodiment, synchronous transmission network include master network node and the second device network node, described second
Device network node includes slave device network node and middleware network node, and wherein slave device network node is for basis
Synchronizing information in optical wavelength signal carries out the endpoint node on the node namely transmission path of time synchronization；Intermediate equipment net
Network node is the intermediate node in the node being forwarded to optical wavelength signal namely above-mentioned transmission path.In a biography
In defeated path, can only include master network node and slave device network node, can also include master network node, from
Device network node and at least one middleware network node.Above-mentioned optical wavelength signal is transferred to middleware network node
When, intermediate network node will be forwarded optical wavelength signal, when optical wavelength signal is transferred to slave device network node, from setting
Standby network node will carry out time synchronization according to the synchronizing information in optical wavelength signal.The mode of specific time synchronization can be with
With reference to above-described embodiment, details are not described herein.
Further, the control mode of optical wavelength signal forwarding can be configured according to actual needs, below will
It is described in detail with two different implementations.
It is above-mentioned the optical wavelength signal to be controlled to include in photosphere forwarding according to the transmission path for example, referring to Fig. 3：
Cause the optical wavelength signal in second device network based on optical multiplexer/demultiplexer in the second device network node
It is led directly in node, the optical wavelength signal is forwarded to next network node of transmission path.
As shown in figure 3, in the present embodiment, optical multiplexer/demultiplexer and electric treatment list are equipped in the second device network node
Member a, wherein optical multiplexer/demultiplexer is used to receive the optical wavelength signal of upstream network node transmission or upstream network node sends light
Wavelength signals, another optical multiplexer/demultiplexer is used to receive the optical wavelength signal of downstream network node transmission or downstream network node is sent out
Send optical wavelength signal.
In the present embodiment, optical multiplexer/demultiplexer can be configured, when the optical wavelength signal for receiving specific wavelength of light,
The optical wavelength signal in the second device network node is realized and is led directly to.I.e. in the optical wavelength for receiving the transmission of upstream network node
During signal, which can be transmitted directly to another optical multiplexer/demultiplexer, and another optical multiplexer/demultiplexer is forwarded directly to
Downstream network node.Repeating process further for the optical wavelength signal of downstream network node upstream network node transmission is one
It causes, details are not described herein.
It is above-mentioned the optical wavelength signal to be controlled to include in photosphere forwarding according to the transmission path with reference to Fig. 4：
Based on bifurcated multiplexing (OADM Optical Add-Drop Multiplexer) in the second device network node
Device carries out the dynamic dispatching of wavelength so that optical wavelength signal is led directly in the second device network node.
As shown in figure 4, using ROADM (Reconfigurable Optical are equipped in the second device network node
Add-Drop Multiplexer, reconfigurable optical add/drop multiplexer), it is configured by the way that ROADM is configured, control ROADM is carried out
The dynamic dispatching of wavelength so that optical wavelength signal is led directly in the middleware network node.It should be understood that the present embodiment is to light
The processing of wavelength signals refers to the processing of the optical wavelength signal to carrying above-mentioned synchronizing information, for the processing of other optical wavelength
Mode can be handled according to existing mode.
In the embodiment of the present invention, the optical wavelength signal that the transmission of master network node carries synchronizing information is received, it is described
The signal that optical wavelength signal is transmitted by the transmission path of master network node to the second device network node, and it is described
Transmission path has independent optical wavelength；When the second device network node is the endpoint node of the transmission path, root
Time synchronization adjustment is carried out according to the synchronizing information；When the intermediate equipment that the second device network node is the transmission path
During network node, the optical wavelength signal is controlled to be forwarded in photosphere according to the transmission path.Due to being transmitted across for synchronizing information
Cheng Zhong is provided with independent optical wavelength, therefore the second device network node can be extracted directly and carry synchronization to synchronizing information
The optical wavelength signal of information, and synchronizing information is obtained, so as to shorten the time of synchronizing information acquisition, reduce and obtain synchronous letter
The difficulty of breath reduces time calculating error.
3rd embodiment
Referring to Fig. 8, Fig. 8 be the present invention implement provide time synchronism apparatus structure chart, the time synchronism apparatus application
In synchronous transmission network, the details of method for synchronizing time in first embodiment can be realized, and achieve the effect that identical.Such as figure
Shown in 8, time synchronism apparatus 800 establishes module 801 and control module 802 including path, wherein：
Module 801 is established in path, for establishing each slave device network node to the transmission path of master network node, is made
Obtain the corresponding a length of mutually different optical wavelength of light wave of each transmission path；
Control module 802, for controlling the loading of the synchronizing information of each slave device network node in the light of corresponding optical wavelength
It in wavelength signals, and is transmitted on the transmit path so that the slave device network node can be according to the synchronization
Information carries out time synchronization adjustment；
Wherein, when the network node that the transmission path is passed through includes the master network node, slave device network
When node and at least a middleware network node, the control module 802 is additionally operable to the mistake transmitted in the optical wavelength signal
Cheng Zhong, middleware network node forward the optical wavelength signal received in photosphere.
Optionally, the middleware network node is specifically used for：Based on photosynthetic point in the middleware network node
Wave device so that the optical wavelength signal is led directly in the middleware network node.
Optionally, the middleware network node is specifically used for, and is answered based on bifurcated in the middleware network node
The dynamic dispatching of wavelength is carried out with device so that optical wavelength signal is led directly in the middleware network node.
Optionally, the optical wavelength be used for transmission the radio frequency channel of the optical wavelength signal transmission mode include single fiber bi-directional mould
Formula.
Optionally, the synchronizing information includes bi-directional synchronization message, and the bi-directional synchronization message is used to supply the slave device
Network node calculates the reporting with master network node according to the bi-directional synchronization message, and carries out time synchronization tune
It is whole.
Optionally, the synchronizing information includes letter synchronization time that master network node is sent to slave device network node
Breath, information synchronization time are used for for the slave device network node according to information synchronization time and the transmission path
Link delay information carry out time synchronization adjustment.
In this way, in the embodiment of the present invention, each slave device network node is established to the transmission path of master network node, is made
Obtain the corresponding a length of mutually different optical wavelength of light wave of each transmission path；Control the synchronization of each slave device network node
Information loading is transmitted on the transmit path on the optical wavelength signal of corresponding optical wavelength so that the slave device
Network node can carry out time synchronization adjustment according to the synchronizing information；Wherein, when the network that the transmission path is passed through
When node includes the master network node, slave device network node and an at least middleware network node, in the light
During wavelength signals are transmitted, control middleware network node forwards the optical wavelength signal received in photosphere.
Due in the transmission process of synchronizing information, it is provided with independent optical wavelength to synchronizing information, therefore slave device network node can be with
Directly extraction carries the optical wavelength signal of synchronizing information, and obtains synchronizing information, so as to shorten synchronizing information acquisition
Time reduces the difficulty for obtaining synchronizing information, reduces time calculating error.At the same time, for the intermediate equipment of transmission path
Network node is when receiving the optical wavelength signal for carrying synchronizing information, without carrying out photoelectric conversion processing, directly turns in photosphere
The optical wavelength signal is sent out, so as to which middleware network node is avoided to carry out what photoelectric conversion processing introduced to optical wavelength signal
Time error.Therefore the present invention improves the precision of time synchronization, due to only the master network node of transmission path and from
Device network node introduces error, therefore can meet the required precision of hundred nanoseconds.
Fourth embodiment
Referring to Fig. 9, Fig. 9 be the present invention implement provide time synchronism apparatus structure chart, the time synchronism apparatus application
In the second device network node of synchronous transmission network, the details of method for synchronizing time in second embodiment can be realized, and
Achieve the effect that identical.As shown in figure 9, time synchronism apparatus 900 includes receiving module 901, adjustment module 902 and forwarding module
903, wherein：
Receiving module 901, it is described for receiving the optical wavelength signal that the transmission of master network node carries synchronizing information
The signal that optical wavelength signal is transmitted by the transmission path of master network node to the second device network node, and the transmission
Path has independent optical wavelength；
Adjust module 902, for the second device network node be the transmission path endpoint node when, according to institute
It states synchronizing information and carries out time synchronization adjustment；
Forwarding module 903, for the middleware network node that the second device network node is the transmission path
When, the optical wavelength signal is controlled to be forwarded in photosphere according to the transmission path.
Optionally, the forwarding module 903 is specifically used for：Institute is caused based on optical multiplexer/demultiplexer in the second device network node
It states optical wavelength signal to lead directly in the second device network node, the optical wavelength signal is forwarded under transmission path
One network node.
Forwarding module 903, the forwarding module 903 are specifically used for：Bifurcated in the second device network node is controlled to answer
The dynamic dispatching of wavelength is carried out with device so that optical wavelength signal is led directly in the second device network node, by described in
Optical wavelength signal is forwarded to next network node of transmission path.
In the embodiment of the present invention, the optical wavelength signal that the transmission of master network node carries synchronizing information is received, it is described
The signal that optical wavelength signal is transmitted by the transmission path of master network node to the second device network node, and it is described
Transmission path has independent optical wavelength；When the second device network node is the endpoint node of the transmission path, root
Time synchronization adjustment is carried out according to the synchronizing information；When the intermediate equipment that the second device network node is the transmission path
During network node, the optical wavelength signal is controlled to be forwarded in photosphere according to the transmission path.Due to being transmitted across for synchronizing information
Cheng Zhong is provided with independent optical wavelength, therefore the second device network node can be extracted directly and carry synchronization to synchronizing information
The optical wavelength signal of information, and synchronizing information is obtained, so as to shorten the time of synchronizing information acquisition, reduce and obtain synchronous letter
The difficulty of breath reduces time calculating error.
Those of ordinary skill in the art may realize that each exemplary lists described with reference to the embodiments described herein
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is performed with hardware or software mode, specific application and design constraint depending on technical solution.Professional technician
Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed
The scope of the present invention.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit can refer to the corresponding process in preceding method embodiment, and details are not described herein.
In embodiment provided herein, it should be understood that disclosed device and method can pass through others
Mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
A kind of division of logic function, can there is an other dividing mode in actual implementation, for example, multiple units or component can combine or
Person is desirably integrated into another system or some features can be ignored or does not perform.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, device or unit
It connects, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical unit, you can be located at a place or can also be distributed to multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the embodiment of the present invention
Purpose.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
That each unit is individually physically present, can also two or more units integrate in a unit.
If the function is realized in the form of SFU software functional unit and is independent product sale or in use, can be with
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme of the present invention is substantially in other words
The part contribute to the prior art or the part of the technical solution can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, is used including some instructions so that a computer equipment (can be
People's computer, server or network equipment etc.) perform all or part of the steps of the method according to each embodiment of the present invention.
And aforementioned storage medium includes：USB flash disk, mobile hard disk, ROM, RAM, magnetic disc or CD etc. are various can to store program code
Medium.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (18)
1. a kind of method for synchronizing time, is applied in synchronous transmission network, which is characterized in that including：
Each slave device network node is established to the transmission path of master network node so that each transmission path is corresponding
The a length of mutually different optical wavelength of light wave；
The synchronizing information of each slave device network node is controlled to load on the optical wavelength signal of corresponding optical wavelength, and in the biography
It is transmitted on defeated path so that the slave device network node can carry out time synchronization adjustment according to the synchronizing information；
Wherein, when the network node that the transmission path is passed through includes the master network node, slave device network node
During an at least middleware network node, during the optical wavelength signal transmits, the middleware network node
The optical wavelength signal received is forwarded in photosphere.
2. according to the method described in claim 1, it is characterized in that, the middleware network node is to the light that receives
Wavelength signals include in photosphere forwarding：
Based on optical multiplexer/demultiplexer in the middleware network node so that the optical wavelength signal is in the middleware network
It is led directly in node.
3. according to the method described in claim 1, it is characterized in that, the middleware network node is to the light that receives
Wavelength signals include in photosphere forwarding：
The dynamic dispatching of wavelength is carried out based on forking multiple device in the middleware network node so that optical wavelength signal exists
It is led directly in the middleware network node.
4. according to the method described in claim 1, it is characterized in that, the optical wavelength is used for transmission the wave of the optical wavelength signal
The transmission mode in road includes single fiber bi-directional pattern.
5. method according to any one of claims 1 to 4, which is characterized in that the synchronizing information includes bi-directional synchronization report
Text, the bi-directional synchronization message are used to be calculated and main equipment net according to the bi-directional synchronization message for the slave device network node
The reporting of network node, and carry out time synchronization adjustment.
6. method according to any one of claims 1 to 4, which is characterized in that the synchronizing information includes master network
Information synchronization time that node is sent to slave device network node, information synchronization time are used to supply the slave device network section
Point carries out time synchronization adjustment according to the link delay information of information synchronization time and the transmission path.
7. a kind of method for synchronizing time is applied in the second device network node of synchronous transmission network, which is characterized in that packet
It includes：
The optical wavelength signal that the transmission of master network node carries synchronizing information is received, the optical wavelength signal is main facility network
The signal that the transmission path of network node to the second device network node is transmitted, and the transmission path has independent light
Wavelength；
When the second device network node is the endpoint node of the transmission path, the time is carried out according to the synchronizing information
Synchronous adjustment；
When the second device network node is the middleware network node of the transmission path, according to the transmission path
The optical wavelength signal is controlled to be forwarded in photosphere.
8. the method according to the description of claim 7 is characterized in that described control the light wave long letter according to the transmission path
Number include the step of photosphere forwards：
Cause the optical wavelength signal in the second device network node based on optical multiplexer/demultiplexer in the second device network node
It is interior straight-through, the optical wavelength signal is forwarded to next network node of transmission path.
9. the method according to the description of claim 7 is characterized in that described control the light wave long letter according to the transmission path
Number include the step of photosphere forwards：
Control the dynamic dispatching of forking multiple device progress wavelength in the second device network node so that optical wavelength signal exists
It is led directly in the second device network node, the optical wavelength signal is forwarded to next network node of transmission path.
10. a kind of time synchronism apparatus, is applied in synchronous transmission network, which is characterized in that including：
Module is established in path, for establishing each slave device network node to the transmission path of master network node so that each
The corresponding a length of mutually different optical wavelength of light wave of the transmission path；
Control module, for controlling the loading of the synchronizing information of each slave device network node in the optical wavelength signal of corresponding optical wavelength
On, and be transmitted on the transmit path so that the slave device network node can be carried out according to the synchronizing information
Time synchronization adjusts；
Wherein, when the network node that the transmission path is passed through includes the master network node, slave device network node
During an at least middleware network node, during the optical wavelength signal transmits, the middleware network node
The optical wavelength signal received is forwarded in photosphere.
11. device according to claim 10, which is characterized in that the middleware network node is specifically used for：It is based on
Optical multiplexer/demultiplexer in the middleware network node so that the optical wavelength signal is straight in the middleware network node
It is logical.
12. device according to claim 10, which is characterized in that the middleware network node is specifically used for, and is based on
Forking multiple device carries out the dynamic dispatching of wavelength in the middleware network node so that optical wavelength signal is in the centre
It is led directly in device network node.
13. device according to claim 10, which is characterized in that the optical wavelength is used for transmission the optical wavelength signal
The transmission mode of radio frequency channel includes single fiber bi-directional pattern.
14. according to claim 10 to 13 any one of them device, which is characterized in that the synchronizing information includes bi-directional synchronization
Message, the bi-directional synchronization message is used to be calculated according to the bi-directional synchronization message for the slave device network node and main equipment
The reporting of network node, and carry out time synchronization adjustment.
15. according to claim 10 to 13 any one of them device, which is characterized in that the synchronizing information includes main equipment net
Information synchronization time that network node is sent to slave device network node, information synchronization time are used to supply the slave device network
Node carries out time synchronization adjustment according to the link delay information of information synchronization time and the transmission path.
16. a kind of time synchronism apparatus is applied in the second device network node of synchronous transmission network, which is characterized in that packet
It includes：
Receiving module, for receiving the optical wavelength signal that the transmission of master network node carries synchronizing information, the optical wavelength
The signal that signal is transmitted by the transmission path of master network node to the second device network node, and the transmission path has
There is independent optical wavelength；
Module is adjusted, for when the second device network node is the endpoint node of the transmission path, according to described same
It walks information and carries out time synchronization adjustment；
Forwarding module, for when the second device network node be the transmission path middleware network node when, root
The optical wavelength signal is controlled to be forwarded in photosphere according to the transmission path.
17. device according to claim 16, which is characterized in that the forwarding module is specifically used for：Based on the second equipment
Optical multiplexer/demultiplexer causes the optical wavelength signal to be led directly in the second device network node in network node, by the light
Wavelength signals are forwarded to next network node of transmission path.
18. device according to claim 16, which is characterized in that the forwarding module is specifically used for：Control described second
Forking multiple device carries out the dynamic dispatching of wavelength in device network node so that optical wavelength signal is in second device network
It is led directly in node, the optical wavelength signal is forwarded to next network node of transmission path.
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