CN105897393A - Clock synchronization method and device - Google Patents
Clock synchronization method and device Download PDFInfo
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- CN105897393A CN105897393A CN201510038147.4A CN201510038147A CN105897393A CN 105897393 A CN105897393 A CN 105897393A CN 201510038147 A CN201510038147 A CN 201510038147A CN 105897393 A CN105897393 A CN 105897393A
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Abstract
The present invention provides a clock synchronization method and device applied to first clock equipment. The method comprises a step of counting the number of received notification messages sent by each second clock equipment in a preset message counting time length, wherein, the notification messages carry the external clocks of the second clock equipment, a step of determining the external clocks of the second clock equipment as candidate clocks according to the counted number of the notification messages, and a step of selecting one candidate clock in the candidate clocks as a best main clock so as to synchronize the clock of the first clock equipment. According to the invention, through setting the message counting time length, the second clock equipment with unstable communication is filtered, the selection of the external clock of unstable second clock equipment as the best main clock is avoided, and thus the stability of the clock of the first clock equipment is ensured.
Description
Technical field
The application relates to network communication technology field, particularly relates to clock synchronizing method and device.
Background technology
In the network that there is multiple clockwork, between different clockworks, clock is needed to synchronize, tool
Body can be realized by existing clock synchronization protocol, such as, NTP (Network Time Protocol,
NTP), PTP (Precision Time Protocol, accurate clock synchronization protocol), its
In, PTP is mainly used in meeting the network demand that required precision is higher.
As a example by PTP protocol, clockwork receives the notification packet that in network, other clockwork sends,
And add up the quantity of the notification packet of same clockwork received, when the quantity of notification packet reaches pre-
If safe quantity time, using this external clock as candidate's clock, then from multiple candidate's clocks filtered out
One best master clock of middle selection synchronizes self clock.But this technical scheme cannot screen out communication instability
The external clock of clockwork, if using the external clock of clockwork unstable for this communication as
Good master clock, will be unable to ensure the stability of self clock.
Summary of the invention
In view of this, this application provides a kind of clock synchronizing method, be applied on the first clockwork,
The method includes:
In default counting messages duration, add up each the second clock equipment received respectively and send
The quantity of notification packet, described notification packet carries the external clock of described second clock equipment；
The quantity of the notification packet according to statistics determines that the external clock of described second clock equipment is candidate
Clock；
Select candidate's clock as best master clock to synchronize described first from described candidate's clock
The clock of clockwork.
Present invention also provides a kind of clock synchronization apparatus, be applied on the first clockwork, this device bag
Include:
Statistic unit, in default counting messages duration, add up respectively receive each the
The quantity of the notification packet that two clockworks send, carries described second clock equipment in described notification packet
External clock；
Determining unit, the quantity for the notification packet according to statistics determines outside described second clock equipment
Portion's clock is candidate's clock；
Lock unit, for select from described candidate's clock candidate's clock as best master clock with
Synchronize the clock of described first clockwork.
The application adds up the notification packet quantity that second clock equipment sends in default counting messages duration,
When determining whether the external clock of this second clock equipment as candidate according to this notification packet quantity
Clock, after obtaining the multiple candidate's clocks coming from different second clock equipment, from multiple candidate's clocks
Select candidate's clock as best master clock, synchronize the clock of the first clockwork.The application passes through
Counting messages duration is set, the second clock equipment that communication is unstable is played a role in filtering, it is to avoid will not
Best master clock elected as by the external clock of stable second clock equipment, thus ensure that the first clockwork
The stability of self clock.
Accompanying drawing explanation
Fig. 1 is the process chart of clock synchronizing method in a kind of embodiment of the application；
Fig. 2 is the underlying hardware schematic diagram of clock synchronization apparatus in a kind of embodiment of the application；
Fig. 3 is the structural representation of clock synchronization apparatus in a kind of embodiment of the application.
Detailed description of the invention
For making the purpose of the application, technical scheme and advantage clearer, referring to the drawings to this
Apply for that described scheme is described in further detail.When explained below relates to accompanying drawing, unless otherwise indicated,
Same numbers in different accompanying drawings represents same or analogous key element.Described in following exemplary embodiment
Embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with such as
The example of the apparatus and method that some aspects that described in detail in appended claims, the application are consistent.
It is only merely for describing the purpose of specific embodiment at term used in this application, and is not intended to be limiting
The application." a kind of " of singulative used in the application and appended claims, " institute
State " and " being somebody's turn to do " be also intended to include most form, unless context clearly shows that other implications.Also should
Work as understanding, term "and/or" used herein refer to and comprise one or more be associated list item
Any or all possible combination of purpose.
Although should be appreciated that may use term first, second, third, etc. various to describe in the application
Information, but these information should not necessarily be limited by these terms.These terms only be used for by same type of information that
This distinguishes.Such as, in the case of without departing from the application scope, the first information can also be referred to as
Two information, similarly, the second information can also be referred to as the first information.Depend on linguistic context, as in this institute
Use word " if " can be construed to " and ... time " or " when ... time " or " response
In determining ".
In the network that there is multiple clockwork, between different clockworks, clock is needed to synchronize.Profit
Clock can be realized with existing clock synchronization protocol (such as, Network Time Protocol, PTP protocol) to synchronize.
As a example by PTP protocol, in prior art, the first clockwork is by receiving second clock in network
Equipment send notification packet obtain second clock equipment provide external clock, the first clockwork for
Each second clock equipment adds up the quantity of the notification packet received respectively.Notification packet when statistics
Quantity when reaching default safe packet quantity, such as, preset security message amount is 2, then when connecing
When receiving 2 notification packets that same second clock equipment sends, it is believed that the outside of this second clock equipment
Clock can participate in calculating best master clock, to synchronize the clock of the first clockwork as candidate's clock.
This technical scheme cannot screen out the external clock of the unstable second clock equipment of communication, if this led to
The external clock of the second clock equipment that letter is unstable, as best master clock, will be unable to ensure the first clock
The clock stability of equipment.
For the problems referred to above, the embodiment of the present application proposes a kind of method that clock synchronizes, and the method is being preset
Counting messages duration in, statistics second clock equipment send notification packet quantity, report according to this notice
Literary composition quantity determines whether the external clock of this second clock equipment as candidate's clock, and is obtaining
After coming from multiple candidate's clocks of different second clock equipment, from multiple candidate's clocks, select a time
Select clock as best master clock, synchronize the clock of the first clockwork.
See Fig. 1, for an embodiment flow chart of the application clock synchronizing method, this embodiment still with
The Clock Synchronization Procedure of the first clockwork is introduced as a example by PTP protocol.
Step 110, in default counting messages duration, add up respectively receive each second time
The quantity of the notification packet that clock equipment sends, carries in described notification packet outside described second clock equipment
Portion's clock.
In the network that there is multiple clockwork, the first clockwork receives and comes from different second clock
The notification packet that equipment sends, obtains the external clock of second clock equipment, and record from notification packet
The external clock of this second clock equipment.
The notification packet of first clockwork second clock equipment to receiving carries out quantity statistics, and only
The notification packet that statistics receives in default counting messages duration, such as, this counting messages preset
Duration can be set to 4 times of notification packet transmission time interval according to the standard-required of PTP protocol.
Step 120, when determining described second clock equipment outside according to the quantity of notification packet of statistics
Clock is candidate's clock.
Determine whether the according to the notification packet quantity of second clock equipment of statistics in step 110
The external clock of two clockworks as candidate's clock, due in subsequent treatment the first clockwork time
Clock synchronizes to depend on best master clock, and best master clock chooses from multiple candidate's clocks,
Therefore, accuracy and the stability of each candidate's clock are particularly important.In the embodiment of the present application, the
One clockwork is after obtaining the notification packet quantity of second clock equipment of statistics, by this notification packet number
The safe packet quantity measured and preset compares, it is judged that whether the data of this notification packet reach default
Safe packet quantity, can be divided into following two situation to process according to judged result:
When the notification packet quantity of the second clock equipment of statistics reaches default safe packet quantity, will
The external clock of second clock equipment is as candidate's clock.From step 110, the first clockwork system
The notification packet quantity of meter is the notification packet quantity received in default counting messages duration, if
Communication link between second clock equipment and second clock equipment and the first clockwork is normal, then
First clockwork receives the notification packet number of this second clock equipment in default counting messages duration
Amount can reach default safe packet quantity, and the i.e. first clockwork can obtain from second clock equipment
Stable external clock, therefore, the external clock of this second clock equipment can be as candidate's clock.
When the safe packet quantity that the notification packet quantity of the second clock equipment of statistics is not up to preset,
Communication chain between this second clock unit exception or this second clock equipment and the first clockwork is described
Road is abnormal, causes the notice that this second clock equipment periodic of acquisition that the first clockwork cannot be stable sends
Message, therefore, it is not possible to using the external clock of this second clock equipment as candidate's clock.From aforementioned step
Understand in rapid 110, when the first clockwork receives the notification packet that second clock equipment sends, in this locality
Have recorded the external clock carried in this notification packet, due to this external clock has determined that cannot be as time
Select clock, therefore, the embodiment of the present application is deleted the external clock of the second clock equipment recorded, with
Releasing memory, it is to avoid the unnecessary wasting of resources.
Furthermore, it is necessary to explanation, when assailant forges notification packet and sends notice report with different identity
Wen Shi, i.e. when the external clock that the first clockwork offer is different, had both made the notice report that assailant sends
Literary composition quantity does not reaches default safe packet quantity, but due to the first clockwork can in internal memory record
Different external clocks, therefore, can take substantial amounts of memory headroom, even exhaust internal memory, cause first
Clockwork cannot be properly functioning.Visible, the embodiment of the present application is deleted the outside not as candidate's clock
The importance of clock.
Step 130, selects candidate's clock as best master clock to synchronize from described candidate's clock
The clock of described first clockwork.
The selection of best master clock can use existing clock algorithm, such as, BMC (Best master clock
Algorithm, best master clock algorithm) algorithm, synchronize the first clock according to the best master clock selected and set
Standby clock.
After determining best master clock, it is judged that during as second clock equipment outside of candidate's clock
Whether clock is best master clock, is handled as follows according to judged result:
When the external clock of the second clock equipment as candidate's clock is not best master clock, delete
The external clock of this second clock equipment of record.At this it should be noted that to not making in step 120
External clock for candidate's clock is deleted, in step 130 to as candidate's clock but be not elected as
The external clock of best master clock is deleted, and deletes releasing memory to greatest extent for twice by front and back,
Avoid the unnecessary wasting of resources.
When the external clock of the second clock equipment as candidate's clock is best master clock, retain this
The external clock of two clockworks, as candidate's clock when selecting best master clock next time.
The most still as a example by PTP protocol, Clock Synchronization Procedure is discussed in detail.
According to PTP protocol requirement, if the first clockwork connects in the notification packet transmission interval of 4 times
Receive at least 2 notification packets that second clock equipment sends, the then external clock of this second clock equipment
BMC computing can be participated in as candidate's clock and select best master clock.
It is assumed that TD1 is the first clockwork, TD2, TD3, TD4 are second clock equipment.TD2、
TD3, TD4 are all spaced with the transmission of 500ns and send notification packet to TD1, and take in notification packet
Carry respective external clock.TD1 receives the notification packet that TD2, TD3, TD4 send, and protects respectively
Deposit the external clock of TD2, TD3, TD4.
TD1 starts intervalometer, and when intervalometer overtime is set a length of 500ns (with sending out of notification packet
Send interval identical), when the timer expires, add up timer expiry number of times, when the timer times out number of times
When reaching 4 times, i.e. reach 4 times notification packet interval duration time, add up respectively receive TD2,
The notification packet quantity of TD3, TD4.Assume that the notification packet at 4 times is spaced in duration, receive
The notification packet quantity of TD2 is 1, and the notification packet quantity of TD3 is 2, the notification packet quantity of TD4
It is 3, then requires that the external clock of TD2 cannot be as candidate's clock, TD3 according to aforementioned PTP protocol
Can be as candidate's clock with the external clock of TD4.Owing to having preserved the outside of TD2 in internal memory
Clock, therefore, when TD2 is unsatisfactory for candidate's Clock, shared by the external clock of release TD2
Memory headroom.
The external clock of TD3 and TD4 participates in BMC computing as candidate's clock, from TD3 and TD4
External clock in select an external clock as best master clock, it is assumed that the external clock of TD4 is elected as
Best master clock, then TD1 uses the external clock of TD4 to synchronize self clock, meanwhile, deletes TD3
The memory headroom shared by external clock, and retain the external clock of TD4 as the most optimal main time
Candidate's clock of clock computing.
Corresponding with the embodiment of preceding clock synchronous method, the application also provides for the enforcement of clock synchronization apparatus
Example.
The embodiment of the application clock synchronization apparatus can be applied on the first clockwork.Device embodiment
Can be realized by software, it is also possible to realize by the way of hardware or software and hardware combining.Real with software
As a example by Xian, as the device on a logical meaning, it is that the CPU by its place equipment is by non-volatile
Computer program instructions corresponding in memorizer reads and runs formation in internal memory.For hardware view,
As in figure 2 it is shown, be a kind of hardware structure diagram of the application clock synchronization apparatus place equipment, except Fig. 2
Outside shown CPU, internal memory and nonvolatile memory, in embodiment, the equipment at device place is usual
Other hardware can also be included.
Refer to Fig. 3, for the structural representation of the clock synchronization apparatus in one embodiment of the application.This time
Clock synchronizer includes: statistic unit 301, determine unit 302 and lock unit 303, wherein:
Statistic unit 301, in default counting messages duration, adds up receive each respectively
The quantity of the notification packet that individual second clock equipment sends, carries described second clock in described notification packet
The external clock of equipment；
Determining unit 302, the quantity for the notification packet according to statistics determines described second clock equipment
External clock be candidate's clock；
Lock unit 303, for select from described candidate's clock candidate's clock as optimal main time
Clock is to synchronize the clock of described first clockwork.
Further,
Described determine unit 302, specifically for judging whether the quantity of the notification packet of described statistics reaches
The safe packet quantity preset；When the quantity of the notification packet of described statistics reaches default safe packet number
During amount, determine that the external clock of described second clock equipment is candidate's clock.
Further, described clock synchronization apparatus also includes:
Record unit, for adding up, at described statistic unit 301, each second clock received respectively
Before the quantity of the notification packet that equipment sends, record the described second clock carried in described notification packet
The external clock of equipment；
Described determining unit 302, the quantity also particularly useful for the notification packet when described statistics is the most pre-
If safe packet quantity time, delete the external clock of second clock equipment recorded.
Further, described clock synchronization apparatus also includes:
Record unit, for adding up, at described statistic unit 301, each second clock received respectively
Before the quantity of the notification packet that equipment sends, record the described second clock carried in described notification packet
The external clock of equipment；
Processing unit, for when described lock unit 303 selects a candidate from described candidate's clock
After clock is as best master clock, it is judged that as candidate's clock second clock equipment external clock whether
For best master clock；When the external clock of the second clock equipment as candidate's clock is not best master clock
Time, delete the external clock of the second clock equipment recorded.
Further, described clock synchronization apparatus also includes:
Described processing unit, is additionally operable to when the external clock of the second clock equipment as candidate's clock is
During good master clock, retain the external clock of described second clock equipment as selecting best master clock next time
Time candidate's clock.
The embodiment of the clock synchronization apparatus shown in above-mentioned Fig. 3, it implements process and can be found in aforementioned side
The explanation of method embodiment, does not repeats them here.
Statistics the from the embodiment of above method and device it can be seen that in default counting messages duration
The notification packet quantity that two clockworks send, according to this notification packet quantity determine whether by this
The external clock of two clockworks, as candidate's clock, comes from different second clock equipment in acquisition many
After individual candidate's clock, select candidate's clock as best master clock from multiple candidate's clocks, synchronize
The clock of the first clockwork.The application is by arranging counting messages duration, to unstable second that communicate
Clockwork plays a role in filtering, it is to avoid elected as most preferably by the external clock of unstable second clock equipment
Master clock, thus ensure that the stability of self clock of the first clockwork.
The foregoing is only the preferred embodiment of the application, not in order to limit the application, all at this
Within the spirit of application and principle, any modification, equivalent substitution and improvement etc. done, should be included in
Within the scope of the application protection.
Claims (10)
1. a clock synchronizing method, is applied on the first clockwork, it is characterised in that the method bag
Include:
In default counting messages duration, add up each the second clock equipment received respectively and send
The quantity of notification packet, described notification packet carries the external clock of described second clock equipment；
The quantity of the notification packet according to statistics determines when the external clock of described second clock equipment is candidate
Clock；
When selecting candidate's clock as best master clock to synchronize described first from described candidate's clock
The clock of clock equipment.
2. the method for claim 1, it is characterised in that the described notification packet according to statistics
Quantity determines that the external clock of described second clock equipment is candidate's clock, including:
Judge whether the quantity of the notification packet of described statistics reaches default safe packet quantity；
When the quantity of the notification packet of described statistics reaches default safe packet quantity, determine described
The external clock of two clockworks is candidate's clock.
3. method as claimed in claim 2, it is characterised in that described add up receive each respectively
Before the quantity of the notification packet that individual second clock equipment sends, also include:
Record the external clock of the described second clock equipment carried in described notification packet；
When the safe packet quantity that the quantity of the notification packet of described statistics is not up to preset, delete and remember
The external clock of the second clock equipment of record.
4. the method for claim 1, it is characterised in that described add up receive each respectively
Before the quantity of the notification packet that individual second clock equipment sends, also include:
Record the external clock of the described second clock equipment carried in described notification packet；
Described from described candidate's clock select candidate's clock as best master clock after, also include:
Whether the external clock judging the second clock equipment as candidate's clock is best master clock；
When the external clock of the second clock equipment as candidate's clock is not best master clock, delete
The external clock of the second clock equipment of record.
5. method as claimed in claim 4, it is characterised in that described method also includes:
When the external clock of the second clock equipment as candidate's clock is best master clock, retain described
The external clock of second clock equipment is as candidate's clock when selecting best master clock next time.
6. a clock synchronization apparatus, is applied on the first clockwork, it is characterised in that this device bag
Include:
Statistic unit, in default counting messages duration, add up respectively receive each the
The quantity of the notification packet that two clockworks send, carries described second clock equipment in described notification packet
External clock；
Determining unit, the quantity for the notification packet according to statistics determines outside described second clock equipment
Portion's clock is candidate's clock；
Lock unit, for select from described candidate's clock candidate's clock as best master clock with
Synchronize the clock of described first clockwork.
7. device as claimed in claim 6, it is characterised in that:
Described determine unit, specifically for judging whether the quantity of the notification packet of described statistics reaches default
Safe packet quantity；When the quantity of the notification packet of described statistics reaches default safe packet quantity,
The external clock determining described second clock equipment is candidate's clock.
8. device as claimed in claim 7, it is characterised in that described device also includes:
Record unit, for adding up, at described statistic unit, each the second clock equipment received respectively
Before the quantity of the notification packet sent, record the described second clock equipment carried in described notification packet
External clock；
Described determine unit, not up to preset also particularly useful for the quantity of the notification packet when described statistics
During safe packet quantity, delete the external clock of the second clock equipment recorded.
9. device as claimed in claim 6, it is characterised in that described device also includes:
Record unit, for adding up, at described statistic unit, each the second clock equipment received respectively
Before the quantity of the notification packet sent, record the described second clock equipment carried in described notification packet
External clock；
Processing unit, for selecting candidate's clock to make at described lock unit from described candidate's clock
After best master clock, it is judged that whether the external clock as the second clock equipment of candidate's clock is
Good master clock；When the external clock of the second clock equipment as candidate's clock is not best master clock,
Delete the external clock of the second clock equipment recorded.
10. device as claimed in claim 9, it is characterised in that described device also includes:
Described processing unit, is additionally operable to when the external clock of the second clock equipment as candidate's clock is
During good master clock, retain the external clock of described second clock equipment as selecting best master clock next time
Time candidate's clock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510038147.4A CN105897393A (en) | 2015-01-26 | 2015-01-26 | Clock synchronization method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510038147.4A CN105897393A (en) | 2015-01-26 | 2015-01-26 | Clock synchronization method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105897393A true CN105897393A (en) | 2016-08-24 |
Family
ID=56999691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510038147.4A Pending CN105897393A (en) | 2015-01-26 | 2015-01-26 | Clock synchronization method and device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263631A (en) * | 2011-08-10 | 2011-11-30 | 瑞斯康达科技发展股份有限公司 | Method and clock node for determining master clock within 1588 clock domain |
| CN102694642A (en) * | 2012-06-07 | 2012-09-26 | 北京东土科技股份有限公司 | Clock transmission type synchronizing method and device based on PTP (Precision Time Protocol) |
| WO2013053256A1 (en) * | 2011-10-13 | 2013-04-18 | 中兴通讯股份有限公司 | Method and apparatus for determining validity of clock synchronization source device |
-
2015
- 2015-01-26 CN CN201510038147.4A patent/CN105897393A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263631A (en) * | 2011-08-10 | 2011-11-30 | 瑞斯康达科技发展股份有限公司 | Method and clock node for determining master clock within 1588 clock domain |
| WO2013053256A1 (en) * | 2011-10-13 | 2013-04-18 | 中兴通讯股份有限公司 | Method and apparatus for determining validity of clock synchronization source device |
| CN102694642A (en) * | 2012-06-07 | 2012-09-26 | 北京东土科技股份有限公司 | Clock transmission type synchronizing method and device based on PTP (Precision Time Protocol) |
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Address after: Binjiang District and Hangzhou city in Zhejiang Province Road 310051 No. 68 in the 6 storey building Applicant after: Hangzhou Dipu Polytron Technologies Inc Address before: Binjiang District and Hangzhou city in Zhejiang Province Road 310051 No. 68 in the 6 storey building Applicant before: Hangzhou Dipu Technology Co., Ltd. |
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Application publication date: 20160824 |