CN108599888A - A kind of distributed network clock synchronizing system - Google Patents
A kind of distributed network clock synchronizing system Download PDFInfo
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- CN108599888A CN108599888A CN201810439743.7A CN201810439743A CN108599888A CN 108599888 A CN108599888 A CN 108599888A CN 201810439743 A CN201810439743 A CN 201810439743A CN 108599888 A CN108599888 A CN 108599888A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
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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
- H04J3/0602—Systems characterised by the synchronising information used
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
Abstract
The present invention relates to a kind of distributed network clock synchronizing systems, including：Clock source is used for tranmitting data register synchronizing information；At least level-one is connected to the clock source step by step from equipment, is synchronized for receiving the clock synchronization information step by step and completing clock；Wherein, the clock source and at least level-one are from the node that equipment is in distributed network clock synchronizing system.The embodiment of the present invention is by measuring link delay and calculating the time difference by link delay, then realize that clock synchronizes, so that the clock synchronization accuracy of distributed network clock synchronizing system reaches nanosecond rank, and make the system that there is stronger stability, i.e. when the equipment in distributed network occurs abnormal, the distributed network can adaptively adjust network structure within a very short time, reselect suitable master clock and complete clock synchronization.
Description
Technical field
The invention belongs to electronics and the communications field, and in particular to a kind of distributed network clock synchronizing system.
Background technology
With the development of information technology, the application also increasingly diversification of distributed network system (DNS) relies on distributed network
Network systematic difference equipment is also rich and varied, and the clock of distributed network system (DNS) synchronizes each network section that can make in the system
Point completes accurate clock synchronization, and with the Application of control device being supplied in the system where each node, with the improvement of equipment, clock is same
The required precision of step is also more and more high.
Currently, distributed network system (DNS) mostly uses greatly IEEE1588, (network measure is synchronous with the precision interval clock of control system
Consensus standard) agreement complete system clock synchronize, i.e., by hardware and software by the internal clock of the network equipment (client computer) with
The master clock of main controller, which is realized, to be synchronized.The equipment of each terminal node in distributed network system (DNS) is completed using IEEE1588 agreements
Clock synchronizes, and precision can reach ms grades.
However, the clock for being completed system using IEEE1588 agreements is synchronized, time signal is transmitted by the system channel
It needs to be delayed to terminal node, and the required delay of different terminals node is also different, so, only using this time service mode
The requirement of medium accuracy time user can be met, i.e., can only meet the timing tracking accuracy demand of ms ranks, some are same to the time
The very stringent distributed network system (DNS) of required precision is walked, required clock synchronization accuracy cannot be reached.
Invention content
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of distributed network clocks to synchronize system
System.The technical problem to be solved in the present invention is achieved through the following technical solutions：
An embodiment of the present invention provides a kind of distributed network clock synchronizing systems, including：
Clock source is used for tranmitting data register synchronizing information；
At least level-one is connected to the clock source step by step from equipment, for receiving the clock synchronization information and complete step by step
It is synchronized at clock；Wherein,
The clock source and at least level-one are from the node that equipment is in distributed network clock synchronizing system.
In one embodiment of the invention, described to include from equipment：Interface module, link delay module, time differential mode
Block and synchronization module；Wherein, the link delay module is connected to the interface module, and the time difference module is connected to institute
Link delay module and shown interface module are stated, the synchronization module is connected to the time difference module and the interface mould
Block.
In one embodiment of the invention, described that the clock source or described is connected by the interface module from equipment
From equipment.
In one embodiment of the invention, the link delay module is for measuring this grade of node to even higher level of node
Link delay, the time difference module are used to calculate described grade node to the even higher level of node according to the link delay
Time difference, the synchronization module is used to receive the time difference and the clock synchronization information completes the same of described grade node
Step.
In one embodiment of the invention, the link delay module is specifically used for：
Delay request message is sent to even higher level of node by this grade of node, and records and stabs at the first time, wherein described the
One timestamp is the delay request message sending time point；
The delay request message is received by the even higher level of node, and records the second timestamp, wherein described second
Timestamp is the delay request message receiving time point；
The even higher level of node sends delay response message to described grade node, and records between the third of sending time
Stamp, wherein the delay response message includes second timestamp；
Described grade node receives the delay response message, obtains second timestamp, and record receiving time
4th timestamp；
The even higher level of node sends delay response to described grade node and follows message, wherein delay response follows
Message includes the third timestamp；
Described grade node receives the delay response and follows message, obtains the third timestamp；
By formula calculate the even higher level of node to described grade node link delay.
In one embodiment of the invention, the link delay meets：
Wherein, link_delay is link delay of the even higher level of node from equipment to described grade node from equipment,
T1 stabs for the first time, and t2 is second timestamp, and t3 is the third timestamp, and t4 is the 4th timestamp.
In one embodiment of the invention, the time difference module is specifically used for：
Sync message is sent to described grade node by the even higher level of node, and records the 5th timestamp；Wherein, institute
State the sending time point that the 5th timestamp is the sync message；
Message is followed to described grade node transmission by the even higher level of node, wherein described follow message comprising described
5th timestamp；
The sync message is received by described grade node, and records the 6th timestamp；Wherein, the 6th timestamp
For the sync message receiving time point；
By following message described in described grade node reception；
The even higher level of node is calculated to described grade node according to the 5th timestamp and the 6th timestamp
Time difference.
In one embodiment of the invention, the time difference meets：
D=link_delay+t6-t5
Wherein, link_delay is link delay of the even higher level of node to described grade node, and D is the upper level
Node is to the time difference of described grade node, and t5 is the 5th timestamp, and t6 is the 6th timestamp.
In one embodiment of the invention, the clock of the distributed network clock synchronizing system synchronizes as periodically fortune
Row.
Compared with prior art, beneficial effects of the present invention：
1) clock system provided by the invention provides more structurally sound Time Synchronizing so that the system time
Synchronization accuracy reaches nanosecond rank, can meet some demands to the very stringent distributed network of clock synchronization requirement；
2) clock system provided by the invention makes distributed network have stronger robustness, when the clock in network
When source or other node devices occur abnormal, which can adaptively adjust network structure within a very short time, reselect
Suitable clock source simultaneously completes clock synchronous task.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of distributed network clock synchronizing system provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of the distributed network clock synchronizing system provided in an embodiment of the present invention from equipment；
Fig. 3 is a kind of Time delay measurement principle signal of distributed network clock synchronizing system provided in an embodiment of the present invention
Figure；
Fig. 4 is a kind of time difference principle schematic of distributed network clock synchronizing system provided in an embodiment of the present invention.
Specific implementation mode
Further detailed description is done to the present invention with reference to specific embodiment, but embodiments of the present invention are not limited to
This.
Embodiment one
Fig. 1 and Fig. 2 are referred to, Fig. 1 is a kind of knot of distributed network clock synchronizing system provided in an embodiment of the present invention
Structure schematic diagram；Fig. 2 is a kind of structural schematic diagram of the distributed network clock synchronizing system provided in an embodiment of the present invention from equipment.
A kind of distributed network clock synchronizing system, including：
Clock source is used for tranmitting data register synchronizing information；
At least level-one is connected to the clock source step by step from equipment, for receiving the clock synchronization information and complete step by step
It is synchronized at clock；Wherein,
The clock source and at least level-one are from the node that equipment is in distributed network clock synchronizing system.
Preferably, described to include from equipment：Interface module, link delay module, time difference module and synchronization module；Its
In, the link delay module is connected to the interface module, the time difference module be connected to the link delay module with
And shown interface module, the synchronization module are connected to the time difference module and the interface module.
Preferably, described that the clock source or described from equipment is connected by the interface module from equipment.
Preferably, the link delay module is for measuring this grade of node to the link delay of even higher level of node, when described
Between difference module be used to according to the link delay calculate described grade node to the time difference of the even higher level of node, the synchronization
Module is used to receive the time difference and the clock synchronization information completes the synchronous of described grade node.
Preferably, the link delay module is specifically used for：
Delay request message is sent to even higher level of node by this grade of node, and records and stabs at the first time, wherein described the
One timestamp is the delay request message sending time point；
The delay request message is received by the even higher level of node, and records the second timestamp, wherein described second
Timestamp is the delay request message receiving time point；
The even higher level of node sends delay response message to described grade node, and records between the third of sending time
Stamp, wherein the delay response message includes second timestamp；
Described grade node receives the delay response message, obtains second timestamp, and record receiving time
4th timestamp；
The even higher level of node sends delay response to described grade node and follows message, wherein delay response follows
Message includes the third timestamp；
Described grade node receives the delay response and follows message, obtains the third timestamp；
By formula calculate the even higher level of node to described grade node link delay.
Preferably, the link delay meets：
Wherein, link_delay is the even higher level of node from equipment
It is stabbed for the first time to described grade node from the link delay of equipment, t1, t2 is second timestamp, and t3 is described
Third timestamp, t4 are the 4th timestamp.
Preferably, the time difference module is specifically used for：
Sync message is sent to described grade node by the even higher level of node, and records the 5th timestamp；Wherein, institute
State the sending time point that the 5th timestamp is the sync message；
Message is followed to described grade node transmission by the even higher level of node, wherein described follow message comprising described
5th timestamp；
The sync message is received by described grade node, and records the 6th timestamp；Wherein, the 6th timestamp
For the sync message receiving time point；
By following message described in described grade node reception；
The even higher level of node is calculated to described grade node according to the 5th timestamp and the 6th timestamp
Time difference.
Preferably, the time difference meets：
Wherein, link_delay is chain of the even higher level of node to described grade node to D=link_delay+t6-t5
Road is delayed, and D is time difference of the even higher level of node to described grade node, and t5 is the 5th timestamp, and t6 is the 6th timestamp.
Preferably, it is cycling service that the clock of the distributed network clock synchronizing system, which synchronizes,.
In the present embodiment, super master clock is determined by clock algorithm algorithm, and measures link delay and time difference, and
The synchronised clock of the node is precisely corrected by link delay and time difference on the basis of clock synchronizes, the system made
Clock synchronization accuracy higher.
Embodiment two
Continuing with referring to Fig. 1 and Fig. 2, Fig. 1 is a kind of distributed network clock synchronizing system provided in an embodiment of the present invention
Structural schematic diagram；Fig. 2 is that a kind of distributed network clock synchronizing system provided in an embodiment of the present invention shows from the structure of equipment
It is intended to.The present embodiment on the basis of the above embodiments, is further described in detail the clock system.Distributed network
Network be by be distributed in different location and with multiple terminals node interconnection made of, have higher reliability, meanwhile, network
It is easy to expand.A kind of distributed network clock synchronizing system, as shown in Figure 1, N is the natural number more than or equal to 1, the distributed network
Network clock system includes clock source and at least level-one from equipment, wherein clock source is used for tranmitting data register synchronizing information；Distribution
Slave equipment in formula network is connected to the clock source step by step, for receiving the clock synchronization information step by step and to complete clock same
Step, and the clock source and at least level-one are from the node that equipment is in distributed network clock synchronizing system.
Preferably, as shown in Fig. 2, the slave equipment of the system includes interface module, link delay module, time difference module
And synchronization module；Wherein, the link delay module is connected to the interface module, and the time difference module is connected to described
Link delay module, the synchronization module are connected to the time difference module and the interface module.
Preferably, within the system, clock source and connected between equipment by interface module, from equipment with from equipment it
Between connected also by interface module；The system in Clock Synchronization Procedure, between equipment and clock source and from equipment with from
Association message, and the message received from equipment where interface module are received and dispatched by interface module between equipment, pass through interface mould
Block is sent to each module out of equipment, meanwhile, each module sends message by interface module.
Preferably, link delay module is for measuring this grade of node to the link delay of even higher level of node, time difference module
For calculating this grade of node to the time difference of even higher level of node according to link delay, synchronization module is for receiving time difference and clock
The clock that synchronizing information completes this grade of node synchronizes.
Preferably, in the system clock synchronizing process, link delay module is specifically used for：Pass through this grade of node upward one
Grade node sends delay request message, and records and stab at the first time, wherein stamp is delay request message sending time at the first time
Point；Delay request message is received by even higher level of node, and records the second timestamp, wherein the second timestamp is that delay is asked
Message receiving time point；Even higher level of node sends delay response message to this grade of node, and records and stab between the third of sending time,
Wherein, delay response message includes the second timestamp；This grade of node receives delay response message, obtains the second timestamp, and remember
Record the 4th timestamp of receiving time；Even higher level of node sends delay response to this grade of node and follows message, wherein delay response
It includes third timestamp to follow message；This grade of node receives delay response and follows message, obtains third timestamp；Pass through formula
Even higher level of node is calculated to the link delay of this grade of node, calculation formula is：
Wherein, link_delay is the even higher level of node from equipment to described
This grade of node is from the link delay of equipment, and t1 is first time stamp, and t2 is second timestamp, when t3 is the third
Between stab, t4 be the 4th timestamp.
Preferably, the time difference module is specifically used for：It is sent together to described grade node by the even higher level of node
Message is walked, and records the 5th timestamp；Wherein, the 5th timestamp is the sending time point of the sync message；Pass through institute
It states even higher level of node and follows message to described grade node transmission, wherein described follow message to include the 5th timestamp；It is logical
It crosses described grade node and receives the sync message, and record the 6th timestamp；Wherein, the 6th timestamp is the synchronization
Message receiving time point；By following message described in described grade node reception；According to the 5th timestamp and the described 6th
Timestamp calculates the even higher level of node to the time difference of described grade node.The calculation formula of time difference is：
D=link_delay+t6-t5, wherein link_delay is chain of the even higher level of node to described grade node
Road is delayed, and D is time difference of the even higher level of node to described grade node, and t5 is the 5th timestamp, and t6 is the 6th timestamp.
Preferably, the clock selecting algorithm of the distributed network clock synchronizing system is periodically to calculate, i.e., every one
Set time carries out operation clock selecting algorithm, and according to clock selecting algorithm picks clock source and from equipment, and determines clock
Synchronous path, meanwhile, it is also cycling service that the clock of the system, which synchronizes, i.e., every a set time, this is that can carry out once
Clock synchronizes, it is ensured that the clock accuracy of the system keeps higher state.
Then the embodiment of the present invention realizes that clock is same by measuring link delay and calculating the time difference according to link delay
Step so that the clock synchronization accuracy of distributed network clock synchronizing system reaches nanosecond rank, and it is relatively strong to make the system have
Stability, i.e., when the equipment in distributed network occurs abnormal, which can be adaptive within a very short time
Network structure is adjusted, suitable master clock is reselected and completes clock synchronization.
Embodiment three
Continuing with referring to Fig. 3 and Fig. 4, Fig. 3 is a kind of distributed network clock synchronizing system provided in an embodiment of the present invention
Time delay measurement principle schematic；Fig. 4 is a kind of time of distributed network clock synchronizing system provided in an embodiment of the present invention
Poor principle schematic.The present embodiment on the basis of the above embodiments carries out the Time Perception module and its clock synchronization system
Detailed description.
Distributed network is by being distributed in different location and having made of the Node station interconnection of multiple terminals.It is any in net
Point be at least connected with two lines road, when any one line failure, communication can turn through other links complete, with compared with
High reliability, meanwhile, network is easy to expand.
Preferably, whole nodes in distributed network constitute a clock system, all nodes in domain point
It Bao Kuo clock source, bridge and end station, wherein the quantity of clock source is one, and the quantity of end station is at least one, and the quantity of bridge is
It is at least one.Each node in distributed network is a Time Perception module, i.e., clock source, bridge and end station are all the time
Sensing module.
Preferably, Time Perception module includes：Synchronous station unit (Site sync), first port (port sync
1), second port (port sync 2), data relay unit (Md), master clock unit (Clock Master) and from clock list
First (Clock Slave), wherein synchronous station unit is according to clock selecting algorithm picks as a result, to determine that the time is felt
Know that module for master clock or from clock, to determine data flow, and calls relevant functional unit；First port is used for institute
The temporal information filling message that synchronous station unit is sent is stated, and sends out the message；Second port is for receiving in data
Turn the message and analytic message of unit transmission, and the temporal information that message includes is sent to the synchronous station unit；Data
Relay unit is connect with external other times sensing module, obtains the timestamp information in message and message, and complete message
Forwarding；Master clock unit is connected with clock source, when the Time Perception module is master clock, for providing standard time letter
Breath, and the standard time information is sent to the synchronous station unit；From clock unit, send and receive temporal information to
The synchronous station unit, and link delay is calculated by temporal information, it is calculated and the upper level time according to the link delay
The time difference of sensing module, and local clock is corrected by the time difference.
Preferably, clock selecting algorithm is sent out between each node by the distributed network where the Time Perception module
Send Announce messages, wherein each node receives and processes the message information of other nodes, and is carried out by Announce messages
Interaction, more each clock information, and select the clock synchronous path of master clock and distributed network, wherein section where master clock
Point is host node, the node being connected with host node be from node, and determination host node in distributed network other nodes it is same
Step diameter.
Preferably, when the Time Perception module is master clock by clock selecting algorithms selection, then the Time Perception mould
Node where block is host node, other coupled nodes are from node, and synchronous station unit is according to clock selecting algorithm
Call master clock unit, first port and data relay unit, wherein master clock unit is connected with clock source, provides the mark time
Temporal information is sent to synchronous station unit by information, master clock unit, and temporal information is sent to first by synchronous station unit
Port, first port obtains the first message information after carrying out message filling to temporal information, and the first message information is sent to
Data relay unit.
Preferably, when the Time Perception module is from clock, then node where the Time Perception module is from node, together
It walks station unit and data relay unit, second port is called according to clock selecting algorithm and from clock unit, wherein data relay
Unit is sent to second port by the second message information, and second port parses the second message information and obtains temporal information, and will
Temporal information is sent to synchronous station unit, and temporal information is sent to from clock unit by synchronous station unit, from clock unit
The temporal information of acquisition and the time difference of local clock are calculated, and corrects local clock.When from node, there is also next stage for this
When node, synchronous station unit also calls first port, and first end is sent to by the temporal information after synchronizing website high-ranking officers just
Mouthful, and the temporal information after correction is carried out by message filling by first port and obtains the first message information, it is then sent to number
It is sent to next stage node according to relay unit, and by data relay unit.
Preferably, clock synchronization will be completed by synchronizing the connected Time Perception module of master-slave relationship there are clock when two
When, prime minister needs to measure link delay, as shown in figure 3, measurement link delay includes：
By distributed network node, upstream connected node sends delay request message, and records and stab at the first time,
In, stamp is delay request message sending time point at the first time；By upstream be connected clock node receive delay request message, and
Record the second timestamp, wherein the second timestamp is delay request message receiving time point；Upstream is connected clock node to this section
Point sends delay response message, and records and stab between the third of sending time, wherein delay response message includes the second timestamp；
This node receives delay response message, obtains the second timestamp, and record the 4th timestamp of receiving time；Upstream is connected clock
Node sends delay response to this node and follows message, wherein it includes third timestamp that delay response, which follows message,；This node
It receives delay response and follows message, obtain third timestamp；Finally, link delay is calculated by formula, calculates link delay
Formula is：
Wherein, link_delay is link delay, and t1 is to stab at the first time, and t2 is the second timestamp, and t3 is the third time
Stamp, t4 are the 4th timestamp.
Preferably, as shown in figure 4, time of measuring difference includes：Sync message is sent to this node by upstream connected node,
And record the 5th timestamp；Wherein, the 5th timestamp is the sending time point of sync message；By upstream connected node to this section
Point sends and follows message, wherein it includes the 5th timestamp to follow message；When receiving sync message by this node, and recording the 6th
Between stab；Wherein, the 6th timestamp is sync message receiving time point；Message is followed by the reception of this node；According to the 5th time
Stamp and the 6th timestamp calculate the time difference of upstream connected node and this node, and the formula for calculating the time difference is：
D=link_delay+t6-t5
Wherein, link_delay is link delay, and D is the time difference, and t5 is the 5th timestamp, and t6 is the 6th timestamp.
Preferably, after this node completion clock synchronizes, similarly, measurement link is sequentially completed to the next stage equipment being connected
Delay and time difference, deadline synchronize, and wherein link delay prolongs for the link of this node to its next stage equipment connected
When, and it is synchronous with this nodal clock.And so on, the clock until completing distributed network synchronizes.
Preferably, delay_Req messages, delay_Resp messages, Sync messages are event message；Pdelay_Resp_
Follow_Up messages, Follow_Up messages are general message, wherein event message needs record when sending and receiving
Accurate timestamp, general message do not have to logging timestamp.
Preferably, from clock after calculating the time difference with master clock, by clock source interface function, clock tune is called
Function is saved, the time difference between master clock is corrected, it is synchronous with the clock of master clock to complete.
Preferably, clock selecting algorithm is cycling service, and distribution is that network clocking synchronization is also cycling service,
In, the clock selecting algorithm time cycle synchronous with clock is obtained by Signaling messages (signaling message), Signaling
Message configures interface setting by the Signal of equipment.
In the present embodiment, when further calculating the time difference by measuring the link delay between associated devices, and passing through
Between difference correction synchronised clock, step by step complete distributed network clock synchronize, distributed network can be made to reach using which
The other clock synchronization accuracy of nanosecond, and the stability that the distributed network clock synchronizes is stronger, can more meet more equipment
Demand.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention's
Protection domain.
Claims (9)
1. a kind of distributed network clock synchronizing system, which is characterized in that including：
Clock source is used for tranmitting data register synchronizing information；
At least level-one is connected to the clock source step by step from equipment, for receiving the clock synchronization information step by step and when completing
Clock synchronizes；Wherein,
The clock source and at least level-one are from the node that equipment is in distributed network clock synchronizing system.
2. clock system according to claim 1, which is characterized in that described to include from equipment：Interface module, link
Time delay module, time difference module and synchronization module；Wherein, the link delay module is connected to the interface module, described
Time difference module is connected to the link delay module and shown interface module, and the synchronization module is connected to the time difference
Module and the interface module.
3. clock system according to claim 2, which is characterized in that described to be connected from equipment by the interface module
Connect the clock source or described from equipment.
4. clock system according to claim 2, which is characterized in that the link delay module is for measuring this grade
Node is to the link delay of even higher level of node, and the time difference module according to the link delay for calculating described grade node
To the time difference of the even higher level of node, the synchronization module is completed for receiving the time difference and the clock synchronization information
The synchronization of described grade node.
5. clock system according to claim 4, which is characterized in that the link delay module is specifically used for：
Delay request message is sent to even higher level of node by this grade of node, and records and stabs at the first time, wherein when described first
Between stamp be the delay request message sending time point；
The delay request message is received by the even higher level of node, and records the second timestamp, wherein second time
Stamp is the delay request message receiving time point；
The even higher level of node sends delay response message to described grade node, and records and stab between the third of sending time,
In, the delay response message includes second timestamp；
Described grade node receives the delay response message, obtains second timestamp, and record the 4th of receiving time
Timestamp；
The even higher level of node sends delay response to described grade node and follows message, wherein delay response follows message
It include the third timestamp；
Described grade node receives the delay response and follows message, obtains the third timestamp；
By formula calculate the even higher level of node to described grade node link delay.
6. clock system according to claim 5, which is characterized in that the link delay meets：
Wherein, link_delay is link delay of the even higher level of node from equipment to described grade node from equipment, and t1 is
The first time stamp, t2 are second timestamp, and t3 is the third timestamp, and t4 is the 4th timestamp.
7. clock system according to claim 4, which is characterized in that the time difference module is specifically used for：
Sync message is sent to described grade node by the even higher level of node, and records the 5th timestamp；Wherein, described
Five timestamps are the sending time point of the sync message；
Message is followed to described grade node transmission by the even higher level of node, wherein described follow message to include the described 5th
Timestamp；
The sync message is received by described grade node, and records the 6th timestamp；Wherein, the 6th timestamp is institute
State sync message receiving time point；
By following message described in described grade node reception；
According to the 5th timestamp and the 6th timestamp calculate the even higher level of node to described grade node time
Difference.
8. synchronization system according to claim 7, which is characterized in that the time difference meets：
D=link_delay+t6-t5
Wherein, link_delay is link delay of the even higher level of node to described grade node, and D is the even higher level of node
To the time difference of described grade node, t5 is the 5th timestamp, and t6 is the 6th timestamp.
9. synchronization system according to claim 1, which is characterized in that the clock of the distributed network clock synchronizing system
Synchronous is cycling service.
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| CN201810439743.7A CN108599888A (en) | 2018-05-09 | 2018-05-09 | A kind of distributed network clock synchronizing system |
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| CN109451521A (en) * | 2018-12-27 | 2019-03-08 | 广东超讯通信技术股份有限公司 | A kind of GPS synchronous method of base station intensive distributed networking |
| CN109921871A (en) * | 2018-12-20 | 2019-06-21 | 清华大学 | A kind of method for synchronizing time, device and network system |
| CN111107622A (en) * | 2019-10-25 | 2020-05-05 | 湖南国科防务电子科技有限公司 | Time synchronization system and method of self-adaptive networking based on ultra-wideband wireless communication |
| CN111638749A (en) * | 2020-06-02 | 2020-09-08 | 北京润科通用技术有限公司 | Simulation system synchronization method, simulation device and system |
| CN112152744A (en) * | 2019-06-28 | 2020-12-29 | 比亚迪股份有限公司 | Clock synchronization method and device, FPGA chip and optical fiber communication network |
| CN113055114A (en) * | 2021-03-08 | 2021-06-29 | 东北大学 | Oil transportation pipe network time synchronization method based on dynamic compensation and hierarchical transmission |
| CN113783650A (en) * | 2021-08-25 | 2021-12-10 | 浙江万胜智能科技股份有限公司 | Method for realizing accurate time synchronization of intelligent electric meter and intelligent terminal based on characteristic current |
| CN114039692A (en) * | 2021-11-04 | 2022-02-11 | 西安数道航空技术有限公司 | Hard clock synchronization method |
| CN114362866A (en) * | 2021-11-25 | 2022-04-15 | 北京卓越信通电子股份有限公司 | Hot standby system of time synchronization master clock of TSN network |
| WO2023029669A1 (en) * | 2021-09-02 | 2023-03-09 | 华为技术有限公司 | Time synchronization monitoring method |
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| CN113055114B (en) * | 2021-03-08 | 2022-06-03 | 东北大学 | Oil transportation pipe network time synchronization method based on dynamic compensation and hierarchical transmission |
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| CN113783650A (en) * | 2021-08-25 | 2021-12-10 | 浙江万胜智能科技股份有限公司 | Method for realizing accurate time synchronization of intelligent electric meter and intelligent terminal based on characteristic current |
| WO2023029669A1 (en) * | 2021-09-02 | 2023-03-09 | 华为技术有限公司 | Time synchronization monitoring method |
| CN114039692A (en) * | 2021-11-04 | 2022-02-11 | 西安数道航空技术有限公司 | Hard clock synchronization method |
| CN114039692B (en) * | 2021-11-04 | 2022-09-30 | 西安数道航空技术有限公司 | Hard clock synchronization method |
| CN114362866A (en) * | 2021-11-25 | 2022-04-15 | 北京卓越信通电子股份有限公司 | Hot standby system of time synchronization master clock of TSN network |
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