CN108270500B - 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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- CN108270500B CN108270500B CN201611254744.1A CN201611254744A CN108270500B CN 108270500 B CN108270500 B CN 108270500B CN 201611254744 A CN201611254744 A CN 201611254744A CN 108270500 B CN108270500 B CN 108270500B
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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
-
- 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
Abstract
The present invention provides a kind of method for synchronizing time and device, this method comprises: establishing respectively from device network node to the transmission path of master network node, so that a length of mutually different optical wavelength of the corresponding light wave of each transmission path；Control it is each from the load of the synchronizing information of device network node on the optical wavelength signal of corresponding optical wavelength, and transmitted on the transmit path；Wherein, when the network node that transmission path is passed through include master network node, from device network node and an at least middleware network node when, during optical wavelength signal transmission, 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, without carrying out photoelectric conversion processing, the optical wavelength signal directly is forwarded in photosphere, so as to avoid middleware network node from carrying 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 technique
The mobile communication system such as TD-SCDMA, CDMA2000, TD-LTE have time synchronization demand, need between base station full
The time synchronization of sufficient Microsecond grade, otherwise will cause base station interference, and call connection can not establish.It is asked to solve time synchronization
Topic, precise synchronization network are arranged 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 generallys 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 is ITU-T G.8273.2 standard, every time error for jumping intermediate node introducing is in tens nanosecond orders, then passing through network
It is difficult to meet the required precision of hundred nanoseconds after transmission.Therefore it is poor that there are timing tracking accuracies in existing method for synchronizing time
The technical issues of.
Summary of the invention
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, being applied in synchronous transmission network the embodiment of the invention provides a kind of method for synchronizing time, wrap
It includes:
It establishes respectively from device network node to the transmission path of master network node, so that each transmission path pair
The a length of mutually different optical wavelength of the light wave answered；
Control it is each from the load of the synchronizing information of device network node on the optical wavelength signal of corresponding optical wavelength, and in institute
State and transmitted in transmission path, enable it is described from device network node according to the synchronizing information carry out time synchronization tune
It is whole；
Wherein, when the network node that the transmission path is passed through includes the master network node, from device network
When node and at least a middleware network node, during optical wavelength signal transmission, 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, comprising:
It receives master network node and sends the optical wavelength signal for carrying synchronizing information, 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 adjustment；
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 respectively from 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 control it is each from the load of the synchronizing information of device network node corresponding optical wavelength optical wavelength
On signal, and transmitted on the transmit path, enable it is described from device network node 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, from device network
When node and at least a middleware network node, during optical wavelength signal transmission, 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, comprising:
Receiving module carries the optical wavelength signal of synchronizing information, the light for receiving the transmission of master network node
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 when the middleware network node that the second device network node is the transmission path
When, the optical wavelength signal is controlled according to the transmission path and is forwarded in photosphere.
In this way, establishing respectively from device network node to the transmission path of master network node, making in the embodiment of the present invention
Obtain the corresponding a length of mutually different optical wavelength of light wave of each transmission path；Control each synchronization from device network node
Information load is transmitted on the transmit path on the optical wavelength signal of corresponding optical wavelength, so that described from equipment
Network node can carry out time synchronization adjustment according to the synchronizing information；Wherein, when the network that the transmission path is passed through
Node include the master network node, from device network node and an at least middleware network node when, 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 to synchronizing information, therefore can be direct from device network node
The optical wavelength signal for carrying synchronizing information is extracted, and obtains synchronizing information, so as to shorten the time of synchronizing information acquisition,
The difficulty for obtaining synchronizing information is reduced, time calculating error is reduced.At the same time, for the middleware network section of transmission path
Point, without carrying out photoelectric conversion processing, directly forwards the light in photosphere when receiving the optical wavelength signal for carrying synchronizing information
Wavelength signals, so as to avoid middleware network node from carrying 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 from facility network
Network node introduces error, therefore can satisfy the required precision of hundred nanoseconds.
Detailed description of the invention
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, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain 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 the 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
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
First embodiment
It is the flow chart of method for synchronizing time provided in an embodiment of the present invention referring to Fig. 1, Fig. 1, which answers
In synchronous transmission network, as shown in Figure 1, comprising the following steps:
Step 101, it establishes respectively from device network node 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 a node among synchronous transmission network, when being also possible to
Between benchmark source device；It is above-mentioned from device network node be synchronous transmission network in any one node.Due to carrying out the time
When synchronous, it usually needs each carry out time synchronization with master network node from device network node, therefore in this implementation
In example, need to establish respectively from 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
Two device network nodes include from device network node and middleware network node, wherein from device network node for 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 for being forwarded to optical wavelength signal namely above-mentioned transmission path.At one
Can only include master network node and from device network node in transmission path, also may include master network node,
From 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 establishing above-mentioned transmission path, each transmission path is corresponding with independent optical wavelength.For example, road
The a length of λ 1 of the light wave of diameter N2 to N1, a length of λ 2 of the light wave of path N3 to N1, the light wave of path N5 to N1 a length of λ 4, path N4 to N1
The a length of λ 4 of light wave.Wherein the value of λ 1, λ 2, λ 3 and λ 4 are unequal.
Step 102, each optical wavelength signal loaded from the synchronizing information of device network node in corresponding optical wavelength is controlled
On, and transmitted on the transmit path, enables and described carried out from device network node according to the synchronizing information
Time synchronization adjustment；
Wherein, when the network node that the transmission path is passed through includes the master network node, from device network
When node and at least a middleware network node, during optical wavelength signal transmission, middleware network node
The optical wavelength signal received is forwarded in photosphere.
Above-mentioned synchronizing information includes master network node to the synchronizing information sent from device network node, and from setting
The synchronization message that standby network node is sent to master network node.
Can send control signaling in the present embodiment or by configuration file HRP-configured master device and it is each from equipment to same
The transmission mode of information is walked, so that each optical wavelength loaded from the synchronizing information of device network node in corresponding optical wavelength
On signal, and transmitted on the transmit path.
For example, only comprising master network node N1 and from device network node N2, above-mentioned road in above-mentioned path N2 to N1
Comprising master network node N1, middleware network node N2 and from device network node N3 in diameter N3 to N1.
Master network node is when sending synchronizing information to each second device network node, the second device network node N2
Synchronizing information can load and 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
When 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 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
For λ 2 optical wavelength signal when, 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,
To obtain the synchronizing information of optical wavelength signal carrying, and time synchronizing is carried out according to the synchronizing information.
In this way, establishing respectively from device network node to the transmission path of master network node, making in the embodiment of the present invention
Obtain the corresponding a length of mutually different optical wavelength of light wave of each transmission path；Control each synchronization from device network node
Information load is transmitted on the transmit path on the optical wavelength signal of corresponding optical wavelength, so that described from equipment
Network node can carry out time synchronization adjustment according to the synchronizing information；Wherein, when the network that the transmission path is passed through
Node include the master network node, from device network node and an at least middleware network node when, 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, independent optical wavelength is provided with to synchronizing information, therefore can be with from device network node
The optical wavelength signal for carrying synchronizing information is directly extracted, 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 avoid middleware network node from carrying 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 satisfy the required precision of hundred nanoseconds.
Further, the control mode for carrying out optical wavelength signal forwarding 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 receiving the optical wavelength signal of specific wavelength of light,
The optical wavelength signal is realized in middleware network node straight-through.I.e. in the optical wavelength for receiving the transmission of upstream network node
When 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 downstream network node optical wavelength signal that upstream network node is sent is one
It causes, details are not described herein.
Referring to Fig. 4, above-mentioned middleware network node includes: in photosphere forwarding to the optical wavelength signal received
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 is equipped in middleware network node
Add-Drop Multiplexer, reconfigurable optical add/drop multiplexer), it is configured by configuring ROADM, 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 to the optical wavelength signal for 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 also may include the optical wavelength signal of other business.That is, in the present embodiment, being passed for synchronous
The wavelength sent can carry other business in the case where not influencing synchronous service simultaneously on the wavelength.For example, synchronizing information
It is carried by PTP Ethernet message, 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 mode.
I.e. in the present embodiment, a positive transmitting optical wavelength and back transfer light wave are individually distributed to above-mentioned transmission path
Long, wherein positive transmitting optical wavelength is used for the transmission of positive synchronizing information, back transfer optical wavelength is for reverse sync information
Transmitting, and positive synchronizing information and reverse sync information are transmitted in same optical fiber, when 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 can be transmitted using double-fiber two-way mode.
Further, it can be set according to actual needs for synchronizing the mode of transmission in synchronous transmission network
It sets.Such as in first scheme, it can be carried out by the way of bi-directional synchronization message from device network node and master network
The time synchronization of node can also pass through master network node-node transmission using record link delay information in the second scenario
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
The reporting with master network node is calculated from device network node according to the bi-directional synchronization message, and carries out the time
Synchronous adjustment.
As shown in figure 5, master network node and from can periodically be carried out between device network node it is two-way same
Message interaction is walked, thus by calculating the time with master network node according to the bi-directional synchronization message from device network node
Deviation, and time synchronization adjustment is periodically carried out, to reach between device network node and master network node
Time synchronization.
In the second scenario, above-mentioned synchronizing information includes master network node to the synchronization sent from device network node
Temporal information, information synchronization time are used for for described from 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, the link delay information will be stored from device network node, and receiving master network section
When information synchronization time of point periodicity sending, according to synchronization time information and the adjustment of link delay information from device network section
The time of point itself, to reach the time synchronization between 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 and carries the transmission of information synchronization time, or temporal information can be carried by pulse signal and be sent, utilize pulse
The rising edge or failing edge of signal indicate time information, to further avoid Message processing bring time error.
Second embodiment
It is the flow chart of method for synchronizing time provided in an embodiment of the present invention referring to Fig. 7, Fig. 7, which answers
In the second device network node of synchronous transmission network, as shown in fig. 7, comprises following steps:
Step 701, it receives master network node and sends the optical wavelength signal for carrying synchronizing information, the light wave long letter
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 and forwards in photosphere.
In the present embodiment, synchronous transmission network includes master network node and the second device network node, and described second
Device network node includes from device network node and middleware network node, wherein from device network node for for basis
The node namely the endpoint node in transmission path that synchronizing information in optical wavelength signal carries out time synchronization；Intermediate equipment net
Network node is the intermediate node in the node for being forwarded to optical wavelength signal namely above-mentioned transmission path.It is passed at one
Can only include master network node and from device network node in defeated path, also may 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 from 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
Referring 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 to include: in photosphere forwarding according to the transmission path control optical wavelength signal for example, referring to Fig. 3
Make 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 receiving the optical wavelength signal of specific wavelength of light,
The optical wavelength signal is realized in the second device network node straight-through.I.e. in the optical wavelength for receiving the transmission of upstream network node
When 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 downstream network node optical wavelength signal that upstream network node is sent is one
It causes, details are not described herein.
It is above-mentioned to include: in photosphere forwarding according to the transmission path control optical wavelength signal referring 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 is equipped in the second device network node
Add-Drop Multiplexer, reconfigurable optical add/drop multiplexer), it is configured by configuring ROADM, 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 to the optical wavelength signal for 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, receives master network node and send the optical wavelength signal for carrying synchronizing information, 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
When network node, the optical wavelength signal is controlled according to the transmission path and is forwarded in photosphere.Due to being transmitted across for synchronizing information
Cheng Zhong is provided with independent optical wavelength to synchronizing information, therefore the second device network node can be extracted directly and carry synchronization
The optical wavelength signal of information, and synchronizing information is obtained, so as to shorten the time of synchronizing information acquisition, reduces and obtain synchronous letter
The difficulty of breath reduces time calculating error.
3rd embodiment
It is the structure chart that the present invention implements the time synchronism apparatus provided, the time synchronism apparatus application referring to Fig. 8, Fig. 8
In synchronous transmission network, the details of method for synchronizing time in first embodiment can be realized, and reach identical effect.Such as figure
Shown in 8, time synchronism apparatus 800 includes that module 801 and control module 802 are established in path, in which:
Module 801 is established in path, for establishing respectively from 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 control it is each from the load of the synchronizing information of device network node corresponding optical wavelength light
In wavelength signals, and transmitted on the transmit path, enable it is described from device network node 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, from device network
When node and at least a middleware network node, the control module 802 is also used 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, multiple 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, it includes single fiber bi-directional mould that the optical wavelength, which is used for transmission the transmission mode of the radio frequency channel of the optical wavelength signal,
Formula.
Optionally, the synchronizing information includes bi-directional synchronization message, and the bi-directional synchronization message is used for for described from equipment
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 that master network node is believed to the synchronization time sent from device network node
Breath, information synchronization time are used for for described from device network node according to information synchronization time and the transmission path
Link delay information carry out time synchronization adjustment.
In this way, establishing respectively from device network node to the transmission path of master network node, making in the embodiment of the present invention
Obtain the corresponding a length of mutually different optical wavelength of light wave of each transmission path；Control each synchronization from device network node
Information load is transmitted on the transmit path on the optical wavelength signal of corresponding optical wavelength, so that described from equipment
Network node can carry out time synchronization adjustment according to the synchronizing information；Wherein, when the network that the transmission path is passed through
Node include the master network node, from device network node and an at least middleware network node when, 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, independent optical wavelength is provided with to synchronizing information, therefore can be with from device network node
The optical wavelength signal for carrying synchronizing information is directly extracted, 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 avoid middleware network node from carrying 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 satisfy the required precision of hundred nanoseconds.
Fourth embodiment
It is the structure chart that the present invention implements the time synchronism apparatus provided, the time synchronism apparatus application referring to Fig. 9, Fig. 9
In the second device network node of synchronous transmission network, the details of method for synchronizing time in second embodiment can be realized, and
Reach identical effect.As shown in figure 9, time synchronism apparatus 900 includes receiving module 901, adjustment module 902 and forwarding module
903, in which:
Receiving module 901 carries the optical wavelength signal of synchronizing information for receiving the transmission of master network node, described
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 is the middleware network node of the transmission path for the second device network node
When, the optical wavelength signal is controlled according to the transmission path and is forwarded in photosphere.
Optionally, the forwarding module 903 is specifically used for: making institute 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 is multiple in control the second device network node
The dynamic dispatching of wavelength is carried out with device, so that optical wavelength signal is led directly in the second device network node, it will be described
Optical wavelength signal is forwarded to next network node of transmission path.
In the embodiment of the present invention, receives master network node and send the optical wavelength signal for carrying synchronizing information, 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
When network node, the optical wavelength signal is controlled according to the transmission path and is forwarded in photosphere.Due to being transmitted across for synchronizing information
Cheng Zhong is provided with independent optical wavelength to synchronizing information, therefore the second device network node can be extracted directly and carry synchronization
The optical wavelength signal of information, and synchronizing information is obtained, so as to shorten the time of synchronizing information acquisition, reduces and obtain synchronous letter
The difficulty of breath reduces time calculating error.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
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 implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, 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 corresponding processes in the foregoing 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 logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of device or unit
It connects, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.Some or all of unit therein can be selected to realize the embodiment of the present invention according to the actual needs
Purpose.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, ROM, RAM, magnetic or disk etc. are various can store program code
Medium.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and 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 characterized by comprising
It establishes respectively from device network node 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；
Control it is each from the load of the synchronizing information of device network node on the optical wavelength signal of corresponding optical wavelength, and in the biography
Transmitted on defeated path, enable it is described from device network node 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, from device network node
When an at least middleware network node, during optical wavelength signal transmission, the middleware network node
The optical wavelength signal received is forwarded in photosphere.
2. the method according to claim 1, wherein the middleware network node is to the light received
Wavelength signals are forwarded in photosphere
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. the method according to claim 1, wherein the middleware network node is to the light received
Wavelength signals are forwarded in photosphere
The dynamic dispatching that 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. the method according to claim 1, wherein the optical wavelength is used for transmission the wave of the optical wavelength signal
The transmission mode in road includes single fiber bi-directional mode.
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 from device network node according to the bi-directional synchronization message for described
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
To information synchronization time sent from device network node, information synchronization time is used for for described from device network section node
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:
It receives master network node and is sent according to the first transmission path and carry the optical wavelength signal of synchronizing information, described first
Transmission path is the master network node to respectively from the transmission path of device network node including second facility network
The transmission path of network node；The master network node is to respectively from the corresponding light wave of each transmission path of device network node
A length of mutually different optical wavelength；
When the second device network node is the endpoint node of first transmission path, carried out according to the synchronizing information
Time synchronization adjustment；
When the second device network node is the middleware network node of first transmission path, according to described first
Transmission path controls the optical wavelength signal and forwards in photosphere.
8. the method according to the description of claim 7 is characterized in that described control the light wave according to first transmission path
Long signal photosphere forward the step of include:
Make 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 the first transmission path.
9. the method according to the description of claim 7 is characterized in that described control the light wave according to first transmission path
Long signal photosphere forward the step of include:
The dynamic dispatching that forking multiple device in the second device network node carries out wavelength is controlled, 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 section of the first transmission path
Point.
10. a kind of time synchronism apparatus, is applied in synchronous transmission network characterized by comprising
Module is established in path, for establishing respectively from 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 control it is each from the load of the synchronizing information of device network node corresponding optical wavelength optical wavelength signal
On, and transmitted on the transmit path, enables and described carried out from device network node according to the synchronizing information
Time synchronization adjustment；
Wherein, when the network node that the transmission path is passed through includes the master network node, from device network node
When an at least middleware network node, during optical wavelength signal transmission, 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: being 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 mode.
14. device according to any one of claims 10 to 13, which is characterized in that the synchronizing information includes bi-directional synchronization
Message, the bi-directional synchronization message is used to be calculated from device network node according to the bi-directional synchronization message for described in and main equipment
The reporting of network node, and carry out time synchronization adjustment.
15. device according to any one of claims 10 to 13, which is characterized in that the synchronizing information includes main equipment net
To information synchronization time sent from device network node, information synchronization time is used for for described from device network network node
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 sends for receiving master network node according to the first transmission path and carries the optical wavelength of synchronizing information
Signal, first transmission path are the master network node to respectively from the transmission path of device network node including institute
State the transmission path of the second device network node；The master network node is to respectively from each transmission road of device network node
The a length of mutually different optical wavelength of the corresponding light wave of diameter；
Adjust module, for when the second device network node be first transmission path endpoint node when, according to institute
It states synchronizing information and carries out time synchronization adjustment；
Forwarding module, for when the middleware network node that the second device network node is first transmission path
When, the optical wavelength signal is controlled according to the transmission path and is forwarded in photosphere.
17. device according to claim 16, which is characterized in that the forwarding module is specifically used for: being based on the second equipment
Optical multiplexer/demultiplexer leads directly to the optical wavelength signal in the second device network node in network node, by the light
Wavelength signals are forwarded to next network node of the first 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 the first transmission path.
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| CN114630402A (en) * | 2021-11-23 | 2022-06-14 | 杭州安脉盛智能技术有限公司 | Wireless sensor data synchronous acquisition system and method |
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