CN108650259A - A kind of Time Perception module and its clock synchronization system based on distributed network - Google Patents
A kind of Time Perception module and its clock synchronization system based on distributed network Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
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Abstract
The present invention relates to a kind of Time Perception module and its clock synchronization system based on distributed network, a kind of Time Perception module based on distributed network, including：Synchronous station unit, master clock unit, from clock unit, first port, second port, data relay unit, a kind of clock synchronization system based on distributed network, it is formed including multiple Time Perception modules, the correlation unit that the embodiment of the present invention passes through clock selecting algorithm allocating time sensing module, and it is poor by calculating link delay and time of measuring, the clock finally completed between connected Time Perception module synchronizes, clock to reach distributed network synchronizes, so that the clock synchronization accuracy of distributed network clock synchronizing system reaches nanosecond rank, and the distributed network has stronger stability, to meet the needs of more equipment.
Description
Technical field
The invention belongs to electronics and the communications field, and in particular to a kind of Time Perception module based on distributed network and its
Clock synchronization system.
Background technology
With the fast development of ethernet technology, the requirement of the application of distributed network to clock synchronization accuracy is increasingly
It is high.In real life, when the application apparatus of each node also uses different clock synchronizing method progress in distributed network
Clock synchronizes.
Currently, the synchronous protocol for being usually used in Ethernet has：Network Time Protocol NTP (Network Time Protocol)
With its simple version SNTP (Simple Network Time Protocol).When NTP/SNTP agreement purposes is by computer
Between certain time standards are synchronized to by network interface card, time synchronization is carried out in application layer using server/customer end pattern.
However, since the delay that time signal is transmitted to by distributed network-channel different terminals node is different, so
Synchronization accuracy using this time service mode is not high, generally between 10ms to 100ms, can no longer meet distributed network section
Requirement of the point device to high precision clock.
Invention content
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of times based on distributed network
Sensing module and its clock synchronization 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 Time Perception module and its clock synchronization system based on distributed network, one
Time Perception module of the kind based on distributed network, including：
Synchronous station unit, for determining whether the Time Perception module is master clock according to clock selecting algorithm；
Master clock unit, for transmission time information to the synchronous station unit；
From clock unit, the clock information for receiving the synchronous station unit simultaneously sends the clock information
To the Time Perception application；
First port, the temporal information for receiving the synchronous station unit；
Second port, for the temporal information to be sent to the synchronous station unit；
Data relay unit, the first message information sent for receiving the first port, is additionally operable to the second message
Information is sent to the second port.
In one embodiment of the invention, synchronous station unit is specifically used for according to described in the determination of clock selecting algorithm
Whether Time Perception module is master clock,
If so, the synchronizing station point module calls the master clock unit, described from clock unit, the first port
With the data relay unit；
If it is not, then the synchronous station unit call the data relay form unit, the second port and it is described from when
Clock unit.
In one embodiment of the invention, the clock selecting algorithm includes：
The synchronous website receives clock information；
The synchronous website determines the sensing module master clock or the non-master clock according to the clock information.
In one embodiment of the invention, the master clock unit is connected with clock source.
In one embodiment of the invention, when the Time Perception module is master clock, the master clock unit is sent
The temporal information to the synchronous station unit, the synchronous station unit is believed by described from clock unit by the time
Breath is sent to the Time Perception application, meanwhile, the temporal information is sent to the first end by the synchronous station unit
Mouthful, the temporal information is sent to the data relay unit by the first port by first message information.
In one embodiment of the invention, when the Time Perception module is non-master clock, the data relay unit
The temporal information is sent to the second port by second message information, the second port believes the time
Breath is sent to the synchronous station unit, the synchronous station unit temporal information is sent to it is described from clock unit,
The time difference that the temporal information and local clock are calculated from clock unit corrects the local using the time difference
Clock.
In one embodiment of the invention, first message information by the first port to the temporal information
It is obtained after carrying out message filling.
In one embodiment of the invention, further include：The Time Perception module is also connected with next stage Time Perception mould
When block, presently described synchronous station unit high-ranking officers just after the temporal information be sent to presently described first port, current institute
It states first port and the temporal information is sent to presently described data relay unit.
In one embodiment of the invention, the temporal information is obtained after the second message information parsing.
The present invention also provides a kind of clock synchronization systems based on distributed network, include the Time Perception mould of the present invention
Time Perception module described in block.
Compared with prior art, beneficial effects of the present invention：
1) clock synchronization system provided by the invention provides more structurally sound Time Synchronizing so that the system time
Synchronization accuracy reaches nanosecond rank；
2) clock synchronization system provided by the invention makes the system have stronger stability.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of the Time Perception module based on distributed network provided in an embodiment of the present invention；
Fig. 2 is a kind of Time delay measurement principle of the clock synchronization system based on distributed network provided in an embodiment of the present invention
Schematic diagram；
Fig. 3 is that a kind of time difference principle of the clock synchronization system based on distributed network provided in an embodiment of the present invention is shown
It is intended to.
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 is referred to, Fig. 1 is a kind of knot of the Time Perception module based on distributed network provided in an embodiment of the present invention
Structure schematic diagram.A kind of Time Perception module based on distributed network, including：
Synchronous station unit, for determining whether the Time Perception module is master clock according to clock selecting algorithm；
Master clock unit, for transmission time information to the synchronous station unit；
From clock unit, the clock information for receiving the synchronous station unit simultaneously sends the clock information
To the Time Perception application；
First port, the temporal information for receiving the synchronous station unit；
Second port, for the temporal information to be sent to the synchronous station unit；
Data relay unit, the first message information sent for receiving the first port, is additionally operable to the second message
Information is sent to the second port.
Preferably, synchronous station unit, specifically for whether determining the Time Perception module according to clock selecting algorithm
For master clock,
If so, the synchronizing station point module calls the master clock unit, described from clock unit, the first port
With the data relay unit；
If it is not, then the synchronous station unit call the data relay form unit, the second port and it is described from when
Clock unit.
Preferably, the clock selecting algorithm includes：
The synchronous website receives clock information；
The synchronous website determines the sensing module master clock or the non-master clock according to the clock information.
Preferably, the master clock unit is connected with clock source.
Preferably, when the Time Perception module is master clock, the master clock unit sends the temporal information to institute
Synchronous station unit is stated, the synchronous station unit is sent to the time by described from clock unit by the temporal information
Aware application, meanwhile, the temporal information is sent to the first port by the synchronous station unit, and the first port is logical
It crosses first message information and the temporal information is sent to the data relay unit.
Preferably, when the Time Perception module is non-master clock, the data relay unit passes through second message
The temporal information is sent to the second port by information, and the temporal information is sent to the synchronization by the second port
Station unit, the synchronous station unit temporal information is sent to it is described from clock unit, it is described from clock unit meter
The time difference for calculating the temporal information and local clock corrects the local clock using the time difference.
Preferably, first message information obtains after carrying out message filling to the temporal information by the first port
.
Preferably, further include：When the Time Perception module is also connected with next stage Time Perception module, presently described synchronization
The temporal information after correction is sent to presently described first port by station unit, when presently described first port will be described
Between information be sent to presently described data relay unit.
Preferably, the temporal information is obtained after the second message information parsing.
The present invention also provides a kind of clock synchronization systems based on distributed network, include the Time Perception mould of the present invention
Time Perception module described in block.
In the present embodiment, it determines whether Time Perception module is master clock by clock selecting algorithm, then determines number
According to flow direction and calling function unit, and the time synchronization of the system is completed by the time difference, makes the clock synchronization accuracy of the system
Higher.
Embodiment two
Continuing with referring to Fig. 1, and Fig. 2 and Fig. 3 are referred to, Fig. 1 is provided in an embodiment of the present invention a kind of based on distribution
The structural schematic diagram of the Time Perception module of network；Fig. 2 be it is provided in an embodiment of the present invention it is a kind of based on distributed network when
Between synchronization system Time delay measurement principle schematic；Fig. 3 be it is provided in an embodiment of the present invention it is a kind of based on distributed network when
Between synchronization system time difference principle schematic.On the basis of the above embodiments, emphasis is to being based on distributed network for the present embodiment
The Time Perception module and its clock synchronization system of network are described in detail.
A kind of Time Perception module based on distributed network, a network node is exactly one in the distributed network
Time Perception module, the Time Perception module include：Synchronous station unit (Sitesync), first port (portsync 1),
Second port (portsync 2), data relay unit (Md), master clock unit (ClockMaster) and from clock unit
(ClockSlave), wherein synchronous station unit is according to clock selecting algorithm picks as a result, to determine the Time Perception mould
Block to determine data flow, and calls relevant functional unit for master clock or from clock；First port, being used for will be described same
It walks the temporal information that station unit is sent and fills message, and send out the message；Second port is for receiving data relay list
The message and analytic message that member is sent, 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, and the timestamp information in message and message is obtained, and completes turning for message
Hair；Master clock unit is connected with clock source, when the Time Perception module is master clock, for providing standard time information, and
The standard time information is sent to the synchronous station unit；From clock unit, temporal information is sended and received to described
Synchronous station unit, and link delay is calculated by temporal information, it is calculated and upper level Time Perception according to the link delay
The time difference of 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 (declaration message), wherein each node receives and processes the message information of other nodes, and passes through
Announce messages interact, more each clock information, and select the clock synchronous path of master clock and distributed network,
Wherein, node where master clock is host node, and the node being connected with host node is from node, and determination host node and distributed network
The synchronous path of other nodes in network.
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, when the connected Time Perception module that two existence times synchronize master-slave relationship wants the deadline to synchronize
When, prime minister needs to measure link delay, as shown in Fig. 2, 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 3, 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, a kind of clock synchronization system based on distributed network, including be made of multiple Time Perception modules,
In, time synchronization is carried out by message form between each connected Time Perception module.
Preferably, the time synchronization of each node of the distributed network corrects each node by time difference of adjacent node
Time, i.e. the synchronised clock of correction time sensing module, and the time synchronization of the distributed network is cycling service.
The embodiment of the present invention passes through by the correlation unit of clock selecting algorithm allocating time sensing module and calculates link
Delay and time of measuring are poor, and the clock finally completed between connected Time Perception module synchronizes, to reach distributed network
Clock synchronize so that the clock synchronization accuracy of distributed network clock synchronizing system reaches nanosecond rank, and the distributed network
Network has stronger stability, to meet the needs of more equipment.
Embodiment three
Continuing with referring to Fig. 2 and Fig. 3, Fig. 2 is same for a kind of time based on distributed network provided in an embodiment of the present invention
The Time delay measurement principle schematic of step system；Fig. 3 is that a kind of time based on distributed network provided in an embodiment of the present invention is same
The time difference principle schematic of step system.The present embodiment is on the basis of the above embodiments to the Time Perception module and its time
Synchronization system is described in detail.
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 website synchronizing station dot element (Sitesync), first port
(portsync 1), second port (portsync 2), data relay unit (Md), master clock unit (ClockMaster) and
From clock unit (ClockSlave), wherein synchronous station unit is according to clock selecting algorithm picks as a result, to determine this
Time Perception module to determine data flow, and calls relevant functional unit for master clock or from clock；First port is used
Message is filled in the temporal information for sending the synchronous station unit, and sends out the message；Second port is for receiving
The message and analytic message that data relay unit is sent, and the temporal information that message includes is sent to the synchronous website list
Member；Data relay unit is connect with external other times sensing module, and the timestamp information in message and message is obtained, and
Complete the forwarding of message；Master clock unit is connected with clock source, when the Time Perception module is master clock, for providing mark
Quasi- temporal information, and the standard time information is sent to the synchronous station unit；From clock unit, when sending and receiving
Between information give the synchronous station unit, and by temporal information calculate link delay, according to the link delay calculate with it is upper
The time difference of one level temporal 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 Fig. 2, 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 3, 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 (10)
1. a kind of Time Perception module based on distributed network, which is characterized in that including：
Synchronous station unit, for determining whether the Time Perception module is master clock according to clock selecting algorithm；
Master clock unit, for transmission time information to the synchronous station unit；
From clock unit, the clock information for receiving the synchronous station unit and when being sent to the clock information
Between aware application；
First port, the temporal information for receiving the synchronous station unit；
Second port, for the temporal information to be sent to the synchronous station unit；
Data relay unit, the first message information sent for receiving the first port, is additionally operable to the second message information
It is sent to the second port.
2. Time Perception module according to claim 1, which is characterized in that synchronous station unit, be specifically used for according to when
Clock selection algorithm determines whether the Time Perception module is master clock,
If so, the synchronizing station point module calls the master clock unit, described from clock unit, the first port and institute
State data relay unit；
If it is not, then the synchronous station unit calls the data relay form unit, the second port and described from clock list
Member.
3. Time Perception module according to claim 1, which is characterized in that the clock selecting algorithm includes：
The synchronous website receives clock information；
The synchronous website determines the sensing module master clock or the non-master clock according to the clock information.
4. Time Perception module according to claim 2, which is characterized in that the master clock unit is connected with clock source.
5. Time Perception module according to claim 2, which is characterized in that when the Time Perception module is master clock,
The master clock unit sends the temporal information to the synchronous station unit, the synchronous station unit by it is described from when
The temporal information is sent to the Time Perception application by clock unit, meanwhile, the synchronous station unit believes the time
Breath is sent to the first port, and the temporal information is sent to described by the first port by first message information
Data relay unit.
6. Time Perception module according to claim 2, which is characterized in that the Time Perception module is non-master clock
When, the temporal information is sent to the second port by the data relay unit by second message information, described
The temporal information is sent to the synchronous station unit by second port, and the synchronous station unit sends out the temporal information
It send to described from clock unit, the time difference that the temporal information and local clock are calculated from clock unit, utilizes institute
State the time difference correction local clock.
7. Time Perception module according to claim 6, which is characterized in that first message information passes through described first
Port obtains after carrying out message filling to the temporal information.
8. Time Perception module according to claim 6, which is characterized in that further include：The Time Perception module also connects
When connecing next stage Time Perception module, presently described synchronous station unit high-ranking officers just after the temporal information be sent to current institute
First port is stated, the temporal information is sent to presently described data relay unit by presently described first port.
9. Time Perception module according to claim 6, which is characterized in that obtain institute after the second message information parsing
State temporal information.
10. a kind of clock synchronization system based on distributed network, which is characterized in that described in any one of claim 1~9
Time Perception module.
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