CN105790920A - Method for synchronizing distributed node clocks in network system - Google Patents
Method for synchronizing distributed node clocks in network system Download PDFInfo
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- CN105790920A CN105790920A CN201610101820.9A CN201610101820A CN105790920A CN 105790920 A CN105790920 A CN 105790920A CN 201610101820 A CN201610101820 A CN 201610101820A CN 105790920 A CN105790920 A CN 105790920A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
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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
- 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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- General Health & Medical Sciences (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention discloses a method for synchronizing distributed node clocks in a network system, and aims to provide a method for rapidly and accurately synchronizing synchronization node clocks in the network system. The method comprises the following steps: firstly, calculating clock feature deviations between the synchronization node clocks and a main node clock through time stamps at which the synchronization node clocks receive data packets transmitted by the main node clock; correcting clock frequencies of the synchronization node clocks within a fixed period towards a clock frequency of the main node clock through the deviations; predicting (1/2)X as a time deviation between the main node clock and the synchronization node clocks through the synchronization node clocks to obtain a predicted initial value; reckoning estimated time stamps at which the synchronization node clocks receive the data packets transmitted by the main node clock after next fixed period T1 broadcast of the main node clock through the time deviation; and rapidly and predictively comparing the estimated time stamps with actual time stamps of the synchronization node clocks. Through adoption of the method, the synchronization node clocks of the network system can be synchronized rapidly.
Description
Technical field
The present invention relates to accurate clock synchronous method, more particularly to distribution node clock synchronizing method in a kind of network system.
Background technology
Existing clock synchronizing method is mainly by IEEE1588 clock synchronizing method, in the method, each synchronizing process all needs to carry out three secondary data communications between reference mode and synchronization node to determine Network Transmission Delays, data send and receive the unknown parameters such as delay, calculate process consuming time longer；And owing to needing back and forth to carry out request of data and transmission in synchronizing process, reduce the real-time that clock synchronizes, moreover, the clock characteristic of the existing clock synchronizing method acquiescence each node of compartment system is consistent, owing to the moment of the initial work of node each in system is inconsistent, causes the timing differential of each node in system, and actually, in compartment system, the moment of the clock of each node not only initial work is inconsistent, and the clock characteristic of each node is also inconsistent.
The occasion that requirement of real-time is not high is had certain suitability at some by IEEE1588, but in the higher occasion of industrial automation and requirement of real-time, it is impossible to meet the requirements such as the amount of calculation of synchronizing process is little, real-time.The purpose of the present invention is provides a class high speed, real-time clock synchronizing method, it is particluarly suitable for adopting the automated system of industrial network communication and the application scenario that requirement of real-time is higher, by reducing the amount of calculation in data synchronization process, accelerate lock in time.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of can the quick and precisely method of synchronization node clock in synchronous network system.
The technical solution of the present invention is to provide distribution node clock synchronizing method in a kind of network system, comprises the following steps:
A, one master node clock of offer and some synchronization node clocks；
B, master node clock carry out n times broadcast with host node packet in data delivery time correspondent time with fixed cycle T1 to network system by its own clock cycle property；
C, each synchronization node clock receive N number of packet that master node clock sends the timestamp reaching the moment with self moment flag data bag；
The timestamp that d, each synchronization node clock reach the moment by packet obtains the clock characteristic deviation of each synchronization node clock and master node clock and revises；
E, each synchronization node clock obtain the average X of master node clock packet time stamp and the difference self receiving timestamp；
F, each synchronization node clock predictionFor master node clock and the time deviation of self；
G, each synchronization node clock time according to master node clock with the time deviation correction self of self, and calculate that the next fixed cycle T1 of master node clock self receives the estimated time stamp of master node clock packet after broadcasting；
H, each synchronization node clock self receive stamp actual time of master node clock packet after obtaining next fixed cycle T1 broadcast, if actual time, stamp was less than the time of estimated time stamp, then increase time deviation by the difference half of average X with current time offset；If actual time, stamp was bigger than the time of estimated time stamp, reduce time deviation by the half of current time offset with null value；
I, when practical between difference between stamp and stamp time estimated time less than fixed value T3 orTerminate synchronizing process.
Preferably, described step a to step I interval fixed cycle T2 is repeatedly performed.
Preferably, described synchronization node clock is equipped with data buffer zone to record the timestamp receiving master node clock packet.
Preferably, before described step a further comprising the steps of；Thering is provided N number of synchronization node clock, each synchronization node clock all carries out X broadcast by oneself independent clock interval T1 to system；Each synchronization node clock receives X the broadcast of other synchronization node clocks and is in chronological sequence ranked up by other synchronization node clocks in broadcast every time；Other synchronization node clocks of each synchronization node clock calculation reach the variance of order；Confirming that a synchronization node clock is the master node clock of network system by variance, all the other are synchronization node clock.
Preferably, the master node clock confirmed in network system by variance is referred to: during each synchronization node, other synchronization node clocks of clockwise system broadcasts reach the variance of order；Arbitrary synchronization node clock receives the variance of synchronization node clock transmission and the variance of own broadcast and reception variance is added up；Determine that the minimum synchronization node clock of variance accumulation result is master node clock.
Preferably, the master node clock confirmed in network system by variance is referred to: synchronization node clock corresponding to clockwise system broadcasts minimum variance during each synchronization node；Arbitrary synchronization node clock receive vote for result superposition own broadcast vote for result；Determine that one is voted for the maximum synchronization node clock of result for optimum master clock.
nullAfter adopting above structure，Distribution node clock synchronizing method in one network system of the present invention，Compared with prior art，Have the advantage that the timestamp first passed through when synchronization node clock receives master node clock transmission packet calculates the clock characteristic deviation of each synchronization node clock and master node clock，And by this deviation by the clock frequency of each synchronization node clock in the fixed cycle to the clock frequency correction of master node clock，Due to master node clock simultaneously to each synchronization node clock broadcast，The clock frequency of each synchronization node clock can be revised simultaneously，Substantially increase synchronizing speed，And at this moment each synchronization node clock directly obtains the average X of master node clock packet time stamp and the difference self receiving timestamp，This average X is the fixed value that each synchronization node clock obtains in above-mentioned computation of Period，Essence is made up of time deviation and the call duration time of master node clock and synchronization node clock，By each synchronization node clock predictionObtain estimating initial value with the time deviation of self for master node clock, and after calculating the next fixed cycle T1 broadcast of master node clock by this time deviation, self receive the estimated time stamp of master node clock packet, each synchronization node clock self receives stamp actual time of master node clock packet after obtaining next fixed cycle T1 broadcast afterwards, by the comparison that actual time, stamp stabbed than the estimated time, predicted time deviation is made to be more nearly actual deviation, well avoid the interference of call duration time, synchronization accuracy is high, and operand is little, and compare with each synchronization node clock fast prediction with master node clock, the synchronization node clock of energy synchronous network system rapidly.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the optimum master clock defining method in a kind of network system distribution node clock of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing 1 and specific embodiment, the invention will be further described.
The present invention provides distribution node clock synchronizing method in a kind of network system, comprises the following steps:
A, one master node clock of offer and some synchronization node clocks；
B, master node clock carry out n times broadcast with host node packet in data delivery time correspondent time with fixed cycle T1 to network system by its own clock cycle property；
C, each synchronization node clock receive N number of packet that master node clock sends the timestamp reaching the moment with self moment flag data bag；
The timestamp that d, each synchronization node clock reach the moment by packet obtains the clock characteristic deviation of each synchronization node clock and master node clock and revises；
E, each synchronization node clock obtain the average X of master node clock packet time stamp and the difference self receiving timestamp；
F, each synchronization node clock predictionFor master node clock and the time deviation of self；
G, each synchronization node clock time according to master node clock with the time deviation correction self of self, and calculate that the next fixed cycle T1 of master node clock self receives the estimated time stamp of master node clock packet after broadcasting；
H, each synchronization node clock self receive stamp actual time of master node clock packet after obtaining next fixed cycle T1 broadcast, if actual time, stamp was less than the time of estimated time stamp, then increase time deviation by the difference half of average X with current time offset；If actual time, stamp was bigger than the time of estimated time stamp, reduce time deviation by the half of current time offset with null value；
I, when practical between difference between stamp and stamp time estimated time less than fixed value T3 orTerminate synchronizing process.
nullAfter adopting above structure，Distribution node clock synchronizing method in one network system of the present invention，Compared with prior art，Have the advantage that the timestamp first passed through when synchronization node clock receives master node clock transmission packet calculates the clock characteristic deviation of each synchronization node clock and master node clock，Described synchronization node clock is equipped with data buffer zone to record the timestamp receiving master node clock packet，By this deviation by the clock frequency of each synchronization node clock in the fixed cycle to the clock frequency correction of master node clock，Due to master node clock simultaneously to each synchronization node clock broadcast，The clock frequency of each synchronization node clock can be revised simultaneously，Substantially increase synchronizing speed，And at this moment each synchronization node clock directly obtains the average X of master node clock packet time stamp and the difference self receiving timestamp，This average X is the fixed value that each synchronization node clock obtains in above-mentioned computation of Period，Essence is made up of time deviation and the call duration time of master node clock and synchronization node clock，By each synchronization node clock predictionObtain estimating initial value with the time deviation of self for master node clock, and after calculating the next fixed cycle T1 broadcast of master node clock by this time deviation, self receive the estimated time stamp of master node clock packet, each synchronization node clock self receives stamp actual time of master node clock packet after obtaining next fixed cycle T1 broadcast afterwards, by the comparison that actual time, stamp stabbed than the estimated time, predicted time deviation is made to be more nearly actual deviation, for making fast and accurately close to predicted time deviation more quickly and accurately close to actual deviation, the present invention passes through following step: if actual time, stamp was less than the time of estimated time stamp, then increase time deviation by the difference half of average X with current time offset；If actual time, stamp was bigger than the time of estimated time stamp, reduce time deviation by the half of current time offset with null value；Even if prediction deviation moves closer at actual deviation two ends, owing to whole method is by exponential the reducing of difference of predicted time deviation and actual deviation, can acknowledging time deviation fast and accurately, and can well avoid the interference of call duration time, synchronization accuracy is high, and operand is little, and compare with each synchronization node clock fast prediction with master node clock, the synchronization node clock of energy synchronous network system rapidly.
Described step a to step I interval fixed cycle T2 is repeatedly performed, and can maintain the synchronization accuracy of each synchronization node clock in whole network system, and by stab actual time with the estimated time stab between difference less than fixed value T3 orTerminating synchronizing process, make synchronization accuracy quantify, facilitate and quickly select and adjust the synchronization accuracy of each synchronization node clock in network under different situations, fixed value T3 can be set by user,In M can also freely set, class such as 10 or 20, the present invention provides by the average X method to limit synchronization accuracy, makes synchronization more quick and precisely.
Before described step a further comprising the steps of；Thering is provided N number of synchronization node clock, each synchronization node clock all carries out X broadcast by oneself independent clock interval T1 to system；Each synchronization node clock receives X the broadcast of other synchronization node clocks and is in chronological sequence ranked up by other synchronization node clocks in broadcast every time；Other synchronization node clocks of each synchronization node clock calculation reach the variance of order；Confirming that a synchronization node clock is the master node clock of network system by variance, all the other are synchronization node clock.The master node clock confirmed in network system by variance is referred to: during each synchronization node, other synchronization node clocks of clockwise system broadcasts reach the variance of order, arbitrary synchronization node clock receives variance that synchronization node clock sends and by the variance of own broadcast with receive variance and add up, it is determined that the minimum synchronization node clock of variance accumulation result is master node clock；Or synchronization node clock corresponding to clockwise system broadcasts minimum variance during each synchronization node, arbitrary synchronization node clock receive vote for result superposition own broadcast vote for result, it is determined that vote for the maximum synchronization node clock of result for optimum master clock for one.
Carried out by each synchronization node clock simultaneously, detection is quickly, and by each synchronization node clock conduct an election simultaneously the minimum synchronization node clock of variance or and the minimum optimum master clock that synchronization node clock is network system of variance accumulation result, by order variance, the characteristic of each synchronization node clock is relied on other synchronization node clocks and carry out integrated survey, the situation of reaction is appropriately accurate, choose this net neutral and can stablize accurate clock node the most for optimum master clock, make master node clock all less with the frequency deviation of clock of synchronization node clock and actual deviation, make the frequency deviation of clock between synchronization node clock and master node clock, actual deviation can synchronize faster, make the synchronizing speed of the present invention faster, result is more accurate
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-described embodiment, and all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (6)
1. distribution node clock synchronizing method in a network system, it is characterised in that comprise the following steps:
A, one master node clock of offer and some synchronization node clocks；
B, master node clock carry out n times broadcast with host node packet in data delivery time correspondent time with fixed cycle T1 to network system by its own clock cycle property；
C, each synchronization node clock receive N number of packet that master node clock sends the timestamp reaching the moment with self moment flag data bag；
The timestamp that d, each synchronization node clock reach the moment by packet obtains the clock characteristic deviation of each synchronization node clock and master node clock and revises；
E, each synchronization node clock obtain the average X of master node clock packet time stamp and the difference self receiving timestamp；
F, each synchronization node clock predictionFor master node clock and the time deviation of self；
G, each synchronization node clock time according to master node clock with the time deviation correction self of self, and calculate that the next fixed cycle T1 of master node clock self receives the estimated time stamp of master node clock packet after broadcasting；
H, each synchronization node clock self receive stamp actual time of master node clock packet after obtaining next fixed cycle T1 broadcast, if actual time, stamp was less than the time of estimated time stamp, then increase time deviation by the difference half of average X with current time offset；If actual time, stamp was bigger than the time of estimated time stamp, reduce time deviation by the half of current time offset with null value；
I, when practical between stamp and estimated time stab between difference less than fixed value T3 orTerminate synchronizing process.
2. distribution node clock synchronizing method in network system according to claim 1, it is characterised in that: described step a to step I interval fixed cycle T2 is repeatedly performed.
3. distribution node clock synchronizing method in network system according to claim 1, it is characterised in that: described synchronization node clock is equipped with data buffer zone to record the timestamp receiving master node clock packet.
4. distribution node clock synchronizing method in network system according to claim 3, it is characterised in that: further comprising the steps of before described step a；Thering is provided N number of synchronization node clock, each synchronization node clock all carries out X broadcast by oneself independent clock interval T1 to system；Each synchronization node clock receives X the broadcast of other synchronization node clocks and is in chronological sequence ranked up by other synchronization node clocks in broadcast every time；Other synchronization node clocks of each synchronization node clock calculation reach the variance of order；Confirming that a synchronization node clock is the master node clock of network system by variance, all the other are synchronization node clock.
5. distribution node clock synchronizing method in network system according to claim 4, it is characterised in that: the master node clock confirmed in network system by variance is referred to: during each synchronization node, other synchronization node clocks of clockwise system broadcasts reach the variance of order；Arbitrary synchronization node clock receives the variance of synchronization node clock transmission and the variance of own broadcast and reception variance is added up；Determine that the minimum synchronization node clock of variance accumulation result is master node clock.
6. distribution node clock synchronizing method in network system according to claim 4, it is characterised in that: the master node clock confirmed in network system by variance is referred to: synchronization node clock corresponding to clockwise system broadcasts minimum variance during each synchronization node；Arbitrary synchronization node clock receive vote for result superposition own broadcast vote for result；Determine that one is voted for the maximum synchronization node clock of result for optimum master clock.
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| CN106712885A (en) * | 2016-12-14 | 2017-05-24 | 北京华为数字技术有限公司 | Clock synchronization method, network device and network system |
| CN109981204A (en) * | 2019-02-21 | 2019-07-05 | 福建星云电子股份有限公司 | A kind of Multi-Machine Synchronous method of BMS analogue system |
| CN112653532A (en) * | 2020-12-09 | 2021-04-13 | 西安诺瓦星云科技股份有限公司 | Clock synchronization method, device and system |
| CN115176427A (en) * | 2020-02-28 | 2022-10-11 | 西门子股份公司 | Method for synchronizing control applications via a communication network transmitting time-critical data, network infrastructure device and communication terminal |
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| CN106712885A (en) * | 2016-12-14 | 2017-05-24 | 北京华为数字技术有限公司 | Clock synchronization method, network device and network system |
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| CN115176427A (en) * | 2020-02-28 | 2022-10-11 | 西门子股份公司 | Method for synchronizing control applications via a communication network transmitting time-critical data, network infrastructure device and communication terminal |
| CN112653532A (en) * | 2020-12-09 | 2021-04-13 | 西安诺瓦星云科技股份有限公司 | Clock synchronization method, device and system |
| CN112653532B (en) * | 2020-12-09 | 2023-04-11 | 西安诺瓦星云科技股份有限公司 | Clock synchronization method, device and system |
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