CN102790703B - Method and system for monitoring time faults - Google Patents
Method and system for monitoring time faults Download PDFInfo
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- CN102790703B CN102790703B CN201110131600.8A CN201110131600A CN102790703B CN 102790703 B CN102790703 B CN 102790703B CN 201110131600 A CN201110131600 A CN 201110131600A CN 102790703 B CN102790703 B CN 102790703B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a method and a system for monitoring time faults. The method comprises the steps that monitored nodes in an annual network measure self clockwise time errors and/or anticlockwise time errors relative to a time reference point along the clockwise direction and/or the anticlockwise direction of the annual network; and time faults are monitored according to the clockwise time errors and/or the anticlockwise time errors. According to the method and the system for monitoring the time faults, due to the fact that the time errors obtained by any node in the annual network in the clockwise direction and/or the anticlockwise direction are approximately the same, the time faults can be monitored by monitoring the time errors. Therefore, maintenance efficiency can be improved, and application cost can be reduced.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of time failure monitoring method and system.
Background technology
The method that Precision Time Protocol (Precise Time Protocol, referred to as PTP) defines Network Synchronization, its
The time synchronized of slaver and master is guaranteed by measuring time delay.But, in Practical Project, also exist other interference because
Plain (such as asymmetry of equipment fault, defect, circuit) can cause the time irreversibility of slaver and master.
In correlation technique, when present between failure when, global positioning system (Global Position can only be used
System, referred to as GPS) receiver monitors faulty equipment one by one.But, the method maintenance efficiency is low, application cost is high.
The content of the invention
In for correlation technique, faulty equipment is monitored one by one using GPS, so as to maintenance efficiency is low, application cost
High problem and propose the present invention, for this purpose, present invention is primarily targeted at provide a kind of time failure monitoring method and system,
To solve the above problems.
To achieve these goals, according to an aspect of the invention, there is provided a kind of time failure monitoring method.
Time failure monitoring method of the invention includes：Monitored node in loop network is along the suitable of loop network
Clockwise and/or counter clockwise direction, measure itself relative to time reference time error clockwise and/or it is counterclockwise when
Between error；According to time error clockwise and/or time error counterclockwise, time failure is monitored.
Preferably, the time error clockwise for measuring itself relative to time reference includes：Measurement itself is to time ginseng
The circuit delay time of examination point；Measurement itself sends message clockwise to the transmission time of time reference；Calculate time error
Subtract the circuit delay time equal to the transmission time.
Preferably, measure and itself send clockwise message and include to the transmission time of time reference：Record itself up time
Pin sends the transmission time stamp of message；Determine that time reference receives the reception time stamp of message；The transmission time is calculated equal to reception
The time that time stamp is indicated subtracts the time for sending that time stamp is indicated.
Preferably, determine that time reference receives the reception time stamp of message and includes：Receive from time reference
Comprising reception time stamp in response message, wherein response message；From response message, extract and receive time stamp.
Preferably, receiving after the response message of time reference, said method also includes：From response message
In, extract correction time；The calculating transmission time subtracted the time of time stamp instruction that sends, subtracts school again equal to the time for receiving time stamp instruction
The positive time.
Preferably, according to time error clockwise and/or time error counterclockwise, monitoring time failure includes：Judge suitable
Whether hour hands time error is more than the monolateral alarming threshold value of time error clockwise set in advance, and/or judges counterclockwise
Whether time error is more than the monolateral alarming threshold value of time error counterclockwise set in advance；If it is judged that be it is yes, then
It is determined that clockwise direction and/or counter clockwise direction existence time failure.
Preferably, if it is judged that being no, then judge that time error clockwise with the difference of time error counterclockwise is
The no bilateral alarming threshold value more than time error set in advance, and in the case where difference is more than bilateral alarming threshold value,
It is determined that clockwise direction and/or counter clockwise direction existence time failure.
Preferably, measuring itself time error clockwise and/or time error counterclockwise relative to time reference
Before, said method also includes：In multiple nodes in loop network, a node time reference point is determined；Determine multiple
Other nodes in node in addition to time reference are used as monitored node；Each arranged in monitored node is monitored
Node performs operation of the measurement itself relative to the time error clockwise and/or time error counterclockwise of time reference.
Preferably, it is according to time error clockwise and/or time error counterclockwise, after monitoring time failure, above-mentioned
Method also includes：According to the monitoring result of the monitoring time failure of each monitored node, each monitored node is determined
Time confidence level；According to the confidence level of the time of each monitored node, the time synchronized reliability of loop network is determined
Property.
To achieve these goals, according to another aspect of the present invention, there is provided a kind of time failure monitoring system.
Time failure monitoring system of the invention includes monitored node and time reference, wherein monitored node
Including：Measurement module, for the clockwise direction along loop network and/or counter clockwise direction, measures itself and joins relative to the time
The time error clockwise and/or time error counterclockwise of examination point；Monitoring modular, for according to time error clockwise and/or
Time error, monitors time failure counterclockwise.
The time error that the present invention is obtained from clockwise and counterclockwise according to any node in loop network
It is approximately the same, therefore time failure is monitored by monitoring time error, it is applied to such that it is able to improve maintenance efficiency, reduction
This.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram of loop network according to embodiments of the present invention；
Fig. 2 is the flow chart of time failure monitoring method according to embodiments of the present invention；
Fig. 3 is the structured flowchart of time failure monitoring system according to embodiments of the present invention.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combine.Below with reference to the accompanying drawings and in conjunction with the embodiments describing the present invention in detail.
Fig. 1 is the schematic diagram of loop network according to embodiments of the present invention, as shown in figure 1, node 1 is time reference,
Other nodes (2,3,4,5,6) are monitored nodes.
Based on the loop network of Fig. 1, the invention provides a kind of time failure monitoring method.Fig. 2 is according to of the invention real
The flow chart for applying the time failure monitoring method of example, as shown in Fig. 2 including steps S202 to step S204.
Step S202, clockwise direction and/or counter clockwise direction of the monitored node in loop network along loop network,
Clockwise time error and/or counterclockwise time error of the measurement itself relative to time reference.
Step S204, according to time error clockwise and/or time error counterclockwise, monitors time failure.
In correlation technique, faulty equipment is monitored one by one using GPS, so as to maintenance efficiency is low, application cost is high.This
In inventive embodiments, it is contemplated that the time error that any node in loop network is obtained from clockwise and counterclockwise
It is approximately the same, therefore time failure is monitored by monitoring time error, it is applied to such that it is able to improve maintenance efficiency, reduction
This.
Due to especially make use of any node in loop network in the present embodiment from clockwise and counterclockwise
The approximately uniform characteristic of time error of acquisition, therefore, the present invention, can be with the case where the ring network is symmetry network
Maintenance efficiency is improved preferably.
Preferably, the time error clockwise for measuring itself relative to time reference includes：Measurement itself is to time ginseng
The circuit delay time of examination point；Measurement itself sends message clockwise to the transmission time of time reference；Calculate time error
Subtract the circuit delay time equal to the transmission time.
Specifically describe in this preferred embodiment how monitored node measures itself up time relative to time reference
Pin time error, measures itself time error clockwise relative to time reference simultaneously for monitored node, can adopt
With same or like mode, to avoid introducing non-essential measurement mistake in measured clockwise with measured counterclockwise as far as possible
Difference.
In addition, this preferred embodiment can measure itself to the circuit delay time of time reference by point-to-point mode
, meanwhile, the message that monitored node sends can be unicast P2P delay test messages.Also, the non-prison in the ring network
Surveying node can carry out transparent transmission process to unicast P2P delay tests message.
Preferably, measure and itself send clockwise message and include to the transmission time of time reference：Record itself up time
Pin sends the transmission time stamp of message；Determine that time reference receives the reception time stamp of message；The transmission time is calculated equal to reception
The time that time stamp is indicated subtracts the time for sending that time stamp is indicated.
Preferably, determine that time reference receives the reception time stamp of message and includes：Receive from time reference
Comprising reception time stamp in response message, wherein response message；From response message, extract and receive time stamp.
In this preferred embodiment, it is assumed that the transmission time stamp of the clockwise and counterclockwise of monitored node record is
T3_left and t3_right, meanwhile, the reception time stamp included in response message is t4_left and t4_right, then monitored knot
The transmission time of the transmission message clockwise that point measurement is obtained is t4_left-t3_left, and it is inverse that monitored node measurement is obtained
The transmission time of hour hands transmission message is t4_right-t3_right.
Preferably, receiving after the response message of time reference, said method also includes：From response message
In, extract correction time；The calculating transmission time subtracted the time of time stamp instruction that sends, subtracts school again equal to the time for receiving time stamp instruction
The positive time.
In this preferred embodiment, in the technology of above-mentioned hypothesis, it is assumed that also comprising clockwise and inverse in response message
Conterclockwise correction time is correct_left and correct_right, then monitored node measurement obtain it is clockwise
The transmission time for sending message is t4_left-t3_left-correct_left, and what monitored node measurement was obtained sends out counterclockwise
Deliver newspaper text the transmission time be t4_right-t3_right-correct_right.
Further, it is assumed that circuit delay of the monitored node from clockwise and counterclockwise to time reference
Time is respectively line_delay_left and line_delay_right, then the time error clockwise in the present invention and inverse time
Pin time error can pass through formula below (1) and formula (2) is calculated.
Diff_left=t4_left-t3_left-correct_left-line_delay_left ... (1)
Diff_right=t4_right-t3_right-correct_right-line_delay_ri ght ... (2)
Preferably, according to time error clockwise and/or time error counterclockwise, monitoring time failure includes：Judge suitable
Whether hour hands time error is more than the monolateral alarming threshold value of time error clockwise set in advance, and/or judges counterclockwise
Whether time error is more than the monolateral alarming threshold value of time error counterclockwise set in advance；If it is judged that be it is yes, then
It is determined that clockwise direction and/or counter clockwise direction existence time failure.
Dead failure, Time Calculation failure is typically run in view of time failure, and these failures can all cause or clockwise
Direction or anticlockwise monolateral alarm, therefore, first determine whether in this preferred embodiment that monitored node whether there is up time
Pin direction or anticlockwise monolateral time failure, to ensure efficiency and the accuracy of time failure monitoring.
Preferably, if it is judged that being no, then judge that time error clockwise with the difference of time error counterclockwise is
The no bilateral alarming threshold value more than time error set in advance, and in the case where difference is more than bilateral alarming threshold value,
It is determined that clockwise direction and/or counter clockwise direction existence time failure.
Be also possible to be non-symmetrical fault in view of time failure, and these failures can cause clockwise with it is counterclockwise
The bilateral alarm in direction, therefore, there is no clockwise or counterclockwise judging monitored node in this preferred embodiment
Monolateral time failure, and then judge monitored node with the presence or absence of bilateral time clockwise and counterclockwise therefore
Barrier, so that ensure the accuracy of time failure monitoring.
Preferably, measuring itself time error clockwise and/or time error counterclockwise relative to time reference
Before, said method also includes：In multiple nodes in loop network, a node time reference point is determined；Determine multiple
Other nodes in node in addition to time reference are used as monitored node；Each arranged in monitored node is monitored
Node performs operation of the measurement itself relative to the time error clockwise and/or time error counterclockwise of time reference.
In this preferred embodiment, all monitored node in loop network in addition to time reference could set up
Identical monitoring mechanism, to ensure the unification of time failure monitoring, and then ensures its efficiency and accuracy.
Preferably, it is according to time error clockwise and/or time error counterclockwise, after monitoring time failure, above-mentioned
Method also includes：According to the monitoring result of the monitoring time failure of each monitored node, each monitored node is determined
Time confidence level；According to the confidence level of the time of each monitored node, the time synchronized reliability of loop network is determined
Property.
Preferably, monitored node is 1588 node of platform, for non-monitored node is the unicast P2P time delays of target
Test packet, it can be forwarded according to TC transparent transmission modes.
Below by taking monitored node 4 as an example, process is described in detail to be realized to the embodiment of the present invention.
Monitored node 4 initiates Pdelay circuit delay measurement mechanisms from left and right two ring time reference 1 respectively, respectively
Left and right obtains circuit delay time line_delay_left and line_delay_right.
Monitored node 4 sends the delay_req messages of unicast respectively from left and right two ring time reference 1, and records
The transmission time stamp of two ring delay_req of left and right, t3_left and t3_right.
Monitored node 2, monitored node 3, monitored node 5, monitored node 6 are made at TC to delay_req messages
Reason.
Time reference 1 receives delay_req messages from two rings of left and right respectively, records respective reception time stamp t4_
Left and t4_right, and produce corresponding delay_resp messages.
Monitored node 4 receives delay_resp messages from two rings of left and right respectively, extract t4_left and t4_right with
And correct_left and correct_right.
Calculated according to below equation (1) and formula (2) and calculate respectively diff_left and diff_right, and according to monolateral
Alarming threshold determines whether alarm.
Diff_left=t4_left-t3_left-correct_left-line_delay_left ... (1)
Diff_right=t4_right-t3_right-correct_right-line_delay_ri ght ... (2)
If above-mentioned Diff_left and Diff_right are not above monolateral alarming threshold value, then judge Diff_
Whether left-Diff_right exceedes bilateral alarming threshold value, it is determined whether need alarm.
In the same manner, identical monitoring is set up in monitored node 2, monitored node 3, monitored node 5, monitored node 6.
If equipment occurs in monitored node 3 runs dead failure, the webmaster of loop network understands.
If 3 existence time of monitored node calculates abnormal, monitored node 3 and monitored node 4 are likely to occur alarm.
It is if there is asymmetry failure between monitored node 2, monitored node 3, monitored node 2, monitored
Node 3 and monitored node 4 are likely to occur alarm.
It should be noted that can be in such as one group of computer executable instructions the step of the flow process of accompanying drawing is illustrated
Perform in computer system, and, although show logical order in flow charts, but in some cases, can be with not
The order being same as herein performs shown or described step.
A kind of time failure monitoring system is embodiments provided, the time failure monitoring system can apply to ring
In l network, and for realizing above-mentioned time failure monitoring method.Fig. 3 is time failure monitoring system according to embodiments of the present invention
The structured flowchart of system, as shown in figure 3, including monitored node 32 and time reference 34, wherein monitored node 32 includes surveying
Amount module 322, time failure monitoring modular 324.Below its structure is described in detail.
Measurement module 322, for the clockwise direction along loop network and/or counter clockwise direction, measure itself relative to
The time error clockwise and/or time error counterclockwise of time reference；Monitoring modular 324, is connected to measurement module 322,
For the time error clockwise that measures according to measurement module 322 and/or time error counterclockwise, time failure is monitored.
It should be noted that the time failure monitoring system described in device embodiment is implemented corresponding to above-mentioned method
Example, its concrete implementation process had carried out detailed description in embodiment of the method, will not be described here.
In sum, according to the abovementioned embodiments of the present invention, there is provided a kind of time failure monitoring method and system.This
It is bright approximately the same from the time error that clockwise and counterclockwise is obtained according to any node in loop network, therefore
Time failure is monitored by monitoring time error, such that it is able to improving maintenance efficiency, reducing application cost.
Obviously, those skilled in the art should be understood that each module or each step of the above-mentioned present invention can be with general
Computing device realizing, they can be concentrated on single computing device, or are distributed in multiple computing devices and are constituted
Network on, alternatively, they can be realized with the executable program code of computing device, it is thus possible to they are stored
In the storage device by computing device performing, or they are fabricated to each integrated circuit modules respectively, or by they
In multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific
Hardware and software is combined.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of time failure monitoring method, it is characterised in that include：
Monitored node in loop network measures itself along clockwise direction and/or the counter clockwise direction of the loop network
Relative to the time error clockwise and/or time error counterclockwise of time reference；
According to the time error clockwise and/or time error counterclockwise, time failure is monitored；
Wherein, according to the time error clockwise and/or time error counterclockwise, monitoring time failure includes：
Judge whether the time error clockwise is more than the monolateral alarming threshold value of time error clockwise set in advance,
And/or judge whether the time error counterclockwise is more than the monolateral alarming threshold value of time error counterclockwise set in advance；
If it is judged that being yes, it is determined that the clockwise direction and/or the counter clockwise direction existence time failure；
If it is judged that being no, then judge whether the time error clockwise is big with the difference of the time error counterclockwise
In the bilateral alarming threshold value of time error set in advance, and it is more than the situation of the bilateral alarming threshold value in the difference
Under, determine the clockwise direction and/or the counter clockwise direction existence time failure.
2. method according to claim 1, it is characterised in that measure itself time clockwise relative to time reference
Error includes：
Circuit delay time of the measurement itself to the time reference；
Measurement itself sends message clockwise to the transmission time of the time reference；
Calculate the time error and subtract the circuit delay time equal to the transmission time.
3. method according to claim 2, it is characterised in that measure and itself send message clockwise to the time reference
The transmission time of point includes：
Record the transmission time stamp for itself sending the message clockwise；
Determine that the time reference receives the reception time stamp of the message；
The time that the transmission time is calculated equal to the reception time stamp instruction subtracts the time for sending time stamp instruction.
4. method according to claim 3, it is characterised in that determine that the time reference receives connecing for the message
Time receiving stamp includes：
The response message from the time reference is received, the reception time stamp in wherein described response message, is included；
From the response message, the reception time stamp is extracted.
5. method according to claim 4, it is characterised in that receiving the response message from the time reference
Afterwards, methods described also includes：
From the response message, correction time is extracted；
The time that the transmission time is calculated equal to the reception time stamp instruction subtracts the time for sending time stamp instruction, subtracts institute again
State correction time.
6. method according to any one of claim 1 to 5, it is characterised in that measuring itself relative to time reference
Before the time error clockwise and/or time error counterclockwise of point, methods described also includes：
In multiple nodes in the loop network, time reference described in a node is determined；
Determine other nodes in the plurality of node in addition to the time reference as monitored node；
Each monitored node in the monitored node is set and performs up time of the measurement itself relative to time reference
The operation of pin time error and/or time error counterclockwise.
7. method according to claim 6, it is characterised in that according to the time error clockwise and/or counterclockwise
Time error, after monitoring time failure, methods described also includes：
According to the monitoring result of the monitoring time failure of each monitored node, it is determined that described each monitored node
Time confidence level；
According to the confidence level of the time of each monitored node, the time synchronized reliability of the loop network is determined.
8. a kind of time failure monitoring system, it is characterised in that including monitored node and time reference, wherein described to be supervised
Surveying node includes：
Measurement module, for the clockwise direction along loop network and/or counter clockwise direction, measures itself relative to the time
The time error clockwise and/or time error counterclockwise of reference point；
Monitoring modular, for according to the time error clockwise and/or time error counterclockwise, monitoring time failure；
Wherein, the monitoring modular is additionally operable to：
Judge whether the time error clockwise is more than the monolateral alarming threshold value of time error clockwise set in advance,
And/or judge whether the time error counterclockwise is more than the monolateral alarming threshold value of time error counterclockwise set in advance；
If it is judged that being yes, it is determined that the clockwise direction and/or the counter clockwise direction existence time failure；
If it is judged that being no, then judge whether the time error clockwise is big with the difference of the time error counterclockwise
In the bilateral alarming threshold value of time error set in advance, and it is more than the situation of the bilateral alarming threshold value in the difference
Under, determine the clockwise direction and/or the counter clockwise direction existence time failure.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110131600.8A CN102790703B (en) | 2011-05-19 | 2011-05-19 | Method and system for monitoring time faults |
| PCT/CN2011/076729 WO2012122759A1 (en) | 2011-03-11 | 2011-06-30 | Method and system for monitoring time faults |
| PCT/CN2012/074617 WO2012155772A1 (en) | 2011-05-19 | 2012-04-24 | Time failure monitoring method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110131600.8A CN102790703B (en) | 2011-05-19 | 2011-05-19 | Method and system for monitoring time faults |
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| CN102790703A CN102790703A (en) | 2012-11-21 |
| CN102790703B true CN102790703B (en) | 2017-03-22 |
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| CN201110131600.8A Active CN102790703B (en) | 2011-03-11 | 2011-05-19 | Method and system for monitoring time faults |
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| CN111130673B (en) * | 2018-11-01 | 2021-03-09 | 广州汽车集团股份有限公司 | Vehicle-mounted terminal time synchronization method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1835433A (en) * | 2005-03-14 | 2006-09-20 | 安捷伦科技有限公司 | Applications for multiple time synchronization domains |
| CN102684933A (en) * | 2011-03-11 | 2012-09-19 | 中兴通讯股份有限公司 | Time fault monitoring method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7200158B2 (en) * | 2002-06-24 | 2007-04-03 | Honeywell International | Clock synchronizing method over fault-tolerant Ethernet |
| EP1782559A1 (en) * | 2003-01-14 | 2007-05-09 | Honeywell International Inc. | Method and apparatus for the synchronization of a system time of a communications network with a clock reference |
| CN101741647B (en) * | 2009-12-31 | 2012-09-05 | 中兴通讯股份有限公司 | Method and device for measuring switching time of Ethernet ring network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1835433A (en) * | 2005-03-14 | 2006-09-20 | 安捷伦科技有限公司 | Applications for multiple time synchronization domains |
| CN102684933A (en) * | 2011-03-11 | 2012-09-19 | 中兴通讯股份有限公司 | Time fault monitoring method and system |
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