CN106301646A - A kind of time synchronized message method and device - Google Patents
A kind of time synchronized message method and device Download PDFInfo
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- CN106301646A CN106301646A CN201510264092.9A CN201510264092A CN106301646A CN 106301646 A CN106301646 A CN 106301646A CN 201510264092 A CN201510264092 A CN 201510264092A CN 106301646 A CN106301646 A CN 106301646A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
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Abstract
The invention discloses a kind of time synchronized message method, be applied to optical line terminal, the method includes: detect the time synchronizing signal between this optical line terminal and optical network unit；When the deviation of described time synchronizing signal exceedes threshold value, send time synchronized message to described optical network unit.The present invention ensure that the time continued synchronization of optical line terminal OLT and optical network unit ONU in passive optical network.The invention also discloses a kind of time synchronized message dispensing device.
Description
Technical field
The present invention relates to technical field of photo communication, in particular a kind of time synchronized message method
And device.
Background technology
Soft exchange technology can provide big bandwidth and high reliability, EPON (Passive Optical
Network, PON) it is a kind of main soft exchange technology, as main flow access technology, multiple in the whole world
Area is obtained for large-scale application.
Data service develop rapidly the requirement having highlighted the mobility to data access, wired, nothing
The fusion of line can will preferably meet the requirement of user, improve the experience of user.PON technology has number
According to, voice and time division multiple acess (Time Division Multiplex, referred to as TDM) Full-Services access energy
Power, it is possible to meet the wireless access demand of continuous evolution.Particularly access at microcellulor, Home eNodeB
In application, the convergence property of PON can make whole network layer understand, easy construction, efficient administration.
In correlation technique, the method that PON carries out time synchronized is: optical line terminal (Optical
Line Terminal, referred to as OLT) by external clock (such as, gps clock) signal or from net
In network accurate timing agreement (Precision Time Protocol, referred to as PTP) message recover time
Between generate a time synchronized message, then, will by the passage of business, management or data link layer
This time synchronized message is sent to optical network unit (Optical Network Unit, referred to as ONU).
G.988.9.12.2 define OLT in and be sent to the time synchronized message of ONU, including two parts,
Part I (4 byte) is super frame N, that is, super-frame number device, Part II (10 words
Joint) it is TstampN, that is, timestamp.ONU downlink reception is to n-th superframe super frame
Time, according to the time synchronized message (N, TstampN) received, same in conjunction with PON system itself
Step mechanism generates local zone time, reaches the purpose of time synchronized.
As a kind of point-to-multipoint system, OLT control to ONU send time synchronized message time
Machine.G984.3 Amd2 suggestion at least synchronizes once for 24 hours, and same when ONU is activated for the first time
Step is once.In order to ensure OLT and ONU time continued synchronization, usually, send out with Fixed Time Interval
Send time synchronized message.
But, if clock information changes and do not arrives Fixed Time Interval on OLT, certainly will cause
ONU recovered clock is inconsistent with OLT clock information.So, arise that on OLT and ONU
The situation of time irreversibility, thus had a strong impact on PON the TDM depending on Time Synchronization Mechanism
Etc. business.If simple unlimited reduction sends interval, have substantial amounts of OMCI (ONU Management
And Control Interface, optical network unit management controls interface) interacting message, particularly with OLT
For, multiple a lot of insignificant OMCI message.
In sum, under existing scene, the control method that above time synchronized message sends is when realizing
There is unavoidable defect and limitation, especially OLT clock source occur drift, error or its
In the case of his losing lock, OLT and ONU may have longer time period internal clock can not keep synchronizing,
Need improvement badly.
Summary of the invention
The technical problem to be solved is to provide a kind of time synchronized message method and device,
Ensure that in passive optical network, the time of optical line terminal OLT and optical network unit ONU continues
Synchronize.
In order to solve above-mentioned technical problem, the invention provides a kind of time synchronized message method, should
For optical line terminal, the method includes:
Detect the time synchronizing signal between this optical line terminal and optical network unit；
When the deviation of described time synchronizing signal exceedes threshold value, send the time to described optical network unit same
Step message.
Further, the method also includes following feature:
Detect the time synchronizing signal between this optical line terminal and optical network unit, including:
With very first time interval, the time synchronizing signal between this optical line terminal and optical network unit is carried out
Detection；
Wherein, described time synchronizing signal carries the clock source information of this optical line terminal, described clock source
Information includes Hyper Frame Number n and time stamp T stamp (n).
Further, the method also includes following feature:
With very first time interval, the time synchronizing signal between this optical line terminal and optical network unit is carried out
Detection, including:
The very first time each time be spaced then, according to currently should to optical network unit send time with
The clock source information (N2, Tstamp (N2)) of step message and the time having been issued to optical network unit last time
The clock source information (N1, Tstamp (N1)) of synchronization message determines the departure of current time synchronizing signal
Tdiff；Wherein, N2, N1 are Hyper Frame Number, and Tstamp (N2), Tstamp (N1) are timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, t is the time difference between adjacent two Hyper Frame Number；| | for absolute value sign.
Further, the method also includes following feature:
Time synchronized message is sent to described optical network unit with the second time interval；Wherein, described second
Time interval was spaced more than the described very first time.
Further, the method also includes following feature:
When optical network unit is activated for the first time, send time synchronized message to described optical network unit.
In order to solve above-mentioned technical problem, the invention provides a kind of time synchronized message dispensing device, should
For optical line terminal, including:
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit；
Message transmission module, for when the deviation of described time synchronizing signal exceedes threshold value, to described light
NE sends time synchronized message.
Further, this device also includes following feature:
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit,
Including:
With very first time interval, the time synchronizing signal between this optical line terminal and optical network unit is carried out
Detection；
Wherein, described time synchronizing signal carries the clock source information of this optical line terminal, described clock source
Information includes Hyper Frame Number n and time stamp T stamp (n).
Further, this device also includes following feature:
Detection module, for the very first time interval between this optical line terminal and optical network unit time
Between synchronizing signal detect, including:
The very first time each time be spaced then, according to currently should to optical network unit send time with
The clock source information (N2, Tstamp (N2)) of step message and the time having been issued to optical network unit last time
The clock source information (N1, Tstamp (N1)) of synchronization message determines the departure of current time synchronizing signal
Tdiff；Wherein, N2, N1 are Hyper Frame Number, and Tstamp (N2), Tstamp (N1) are timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, t is the time difference between adjacent two Hyper Frame Number；| | for absolute value sign.
Further, this device also includes following feature:
Message transmission module, is additionally operable to send time synchronized with the second time interval to described optical network unit
Message；Wherein, described second time interval was spaced more than the described very first time.
Further, this device also includes following feature:
Message transmission module, is additionally operable to when optical network unit is activated for the first time, to described optical-fiber network list
Unit sends time synchronized message.
Compared with prior art, a kind of time synchronized message method of present invention offer and device are logical
Cross the deviation at the time synchronizing signal detected between this optical line terminal and optical network unit and exceed threshold value
Time, send time synchronized message to optical network unit, it is possible to ensure that in passive optical network, optical link is eventually
End OLT and the time continued synchronization of optical network unit ONU, it is to avoid OLT clock source drift occurs, misses
In the case of difference or other losing locks, OLT and ONU is because waiting that next time synchronized message sends
Cycle and the long period of causing clock can not keep synchronizing.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of time synchronized message method of the embodiment of the present invention.
Fig. 2 is the structural representation of a kind of time synchronized message dispensing device of the embodiment of the present invention.
Fig. 3 is the information interaction figure of a kind of time synchronized message method of application example of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing
Embodiments of the invention are described in detail.It should be noted that in the case of not conflicting, this Shen
Embodiment in please and the feature in embodiment can mutual combination in any.
As it is shown in figure 1, embodiments provide a kind of time synchronized message method, it is applied to
Optical line terminal, the method includes:
S10, detects the time synchronizing signal between this optical line terminal and optical network unit；
S20, when the deviation of described time synchronizing signal exceedes threshold value, when described optical network unit sends
Between synchronization message；
Described method can also include following feature:
Wherein, detect the time synchronizing signal between this optical line terminal and optical network unit, including:
With very first time interval, the time synchronizing signal between this optical line terminal and optical network unit is carried out
Detection；
Wherein, described time synchronizing signal carries the clock source information of this optical line terminal, described clock source
Information includes Hyper Frame Number n and time stamp T stamp (n)；
Wherein, the deviation of described time synchronizing signal is likely due to the clock source appearance drift of optical line terminal
Move, error or the situation of other losing locks and cause；
Wherein, with very first time interval, the time synchronized between this optical line terminal and optical network unit is believed
Number detect, including:
The very first time each time be spaced then, according to currently should to optical network unit send time with
The clock source information (N2, Tstamp (N2)) of step message and the time having been issued to optical network unit last time
The clock source information (N1, Tstamp (N1)) of synchronization message determines the departure of current time synchronizing signal
Tdiff；Wherein, N2, N1 are Hyper Frame Number, and Tstamp (N2), Tstamp (N1) are timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, t is the time difference between adjacent two Hyper Frame Number；| | for absolute value sign；
Such as, it is assumed that per second have 8000 downlink frame, then t is 1/8000 second；
Wherein, described method also includes:
Time synchronized message is sent to described optical network unit with the second time interval；Wherein, described second
Time interval was spaced more than the described very first time；
Wherein, described method also includes:
When optical network unit is activated for the first time, send time synchronized message to described optical network unit；
Using the method for the invention, can the second time interval be set is very big, and by between the very first time
Every the least (such as, being spaced the time of a superframe) that set.On OLT, (such as, clock source changes
There is drift, error or the situation of other losing locks in clock source) time, between ONU is without waiting for the second time
Every the transmission cycle, but by every very first time interlude synchronizing signal separate-blas estimation, quickly
Keep Tong Bu with OLT.This processing mode had not only reduced interacting message, and had made rational use of resources but also can guarantee that
The time of OLT with ONU keeps consistent.
As in figure 2 it is shown, embodiments provide a kind of time synchronized message dispensing device, it is applied to
Optical line terminal, including:
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit；
Message transmission module, for when the deviation of described time synchronizing signal exceedes threshold value, to described light
NE sends time synchronized message；
Described device can also include following feature:
Wherein, detection module, for detecting the time synchronized between this optical line terminal and optical network unit
Signal, including:
With very first time interval, the time synchronizing signal between this optical line terminal and optical network unit is carried out
Detection；
Wherein, described time synchronizing signal carries the clock source information of this optical line terminal, described clock source
Information includes Hyper Frame Number n and time stamp T stamp (n)；
Wherein, the deviation of described time synchronizing signal is likely due to the clock source appearance drift of optical line terminal
Move, error or the situation of other losing locks and cause；
Wherein, detection module, for very first time interval to this optical line terminal and optical network unit it
Between time synchronizing signal detect, including:
The very first time each time be spaced then, according to currently should to optical network unit send time with
The clock source information (N2, Tstamp (N2)) of step message and the time having been issued to optical network unit last time
The clock source information (N1, Tstamp (N1)) of synchronization message determines the departure of current time synchronizing signal
Tdiff；Wherein, N2, N1 are Hyper Frame Number, and Tstamp (N2), Tstamp (N1) are timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, t is the time difference between adjacent two Hyper Frame Number；| | for absolute value sign；
Wherein, message transmission module, it is additionally operable to the second time interval when described optical network unit sends
Between synchronization message；Wherein, described second time interval was spaced more than the described very first time；
Wherein, message transmission module, it is additionally operable to when optical network unit is activated for the first time, to described light
NE sends time synchronized message.
Application example
The method using the above embodiment of the present invention, the method for synchronizing time between OLT and ONU, bag
Include following step:
S101:OLT arrives in fixing transmission cycle T cycle (timing sends time synchronized message to ONU)
When coming, calculate the N1 superframe super frame and arrive time stamp T stampN1 corresponding during ONU；
OLT, when ONU sends the N1-X superframe Super frame N1-X, is sent out by OMCI message
Send time synchronized message to ONU, wherein carry the clock source information (N1, TstampN1) of OLT；
S102:OLT sends the N1 super frame to ONU；ONU is at the N1 super frame
During arrival, (N1, TstampN1) according to receiving before recovers temporal information；
S103:OLT is when ONU sends the N2-X superframe Super frame N2-X, according to currently
Should to the clock source information (N2, Tstamp (N2)) of the time synchronized message of ONU transmission with last time
It is sent to the clock source information (N1, Tstamp (N1)) of the time synchronized message of optical network unit determine and work as
Departure T of front time synchronizing signaldiff, such as TdiffBeyond threshold value, send the time by OMCI message same
Step message, to ONU, wherein carries the clock source information (N2, TstampN2) of OLT；
S104:OLT sends the N2 super frame to ONU；ONU is at the N2 super frame
During arrival, (N2, TstampN2) according to receiving before recovers temporal information；
S105:OLT, when the next one fixing transmission cycle T cycle arrives, sends N3-X to ONU
During individual superframe Super frame N3-X, by OMCI message transmission time synchronized message to ONU, its
In carry the clock source information (N3, TstampN3) of OLT；
S106:OLT sends the N3 super frame to ONU；ONU is at the N3 super frame
During arrival, (N3, TstampN3) according to receiving before recovers temporal information；
A kind of time synchronized message method of above-described embodiment offer and device, by detecting this
When the deviation of the time synchronizing signal between optical line terminal and optical network unit exceedes threshold value, to optical-fiber network
Unit sends time synchronized message, it is possible to ensure optical line terminal OLT and light net in passive optical network
The time continued synchronization of network unit ONU, it is to avoid drift, error or other mistakes occurs in OLT clock source
In the case of lock, OLT and ONU is because waiting that next time synchronized message sends the cycle and causes relatively
Long-time clock can not keep synchronizing.
One of ordinary skill in the art will appreciate that all or part of step in said method can pass through program
Instructing related hardware to complete, described program can be stored in computer-readable recording medium, as read-only
Memorizer, disk or CD etc..Alternatively, all or part of step of above-described embodiment can also use
One or more integrated circuits realize, and correspondingly, each module/unit in above-described embodiment can use
The form of hardware realizes, it would however also be possible to employ the form of software function module realizes.The present invention is not restricted to appoint
The combination of the hardware and software of what particular form.
It should be noted that the present invention also can have other various embodiments, without departing substantially from the present invention spirit and
In the case of its essence, those of ordinary skill in the art can make various corresponding change according to the present invention
And deformation, but these change accordingly and deform the protection model that all should belong to appended claims of the invention
Enclose.
Claims (10)
1. a time synchronized message method, is applied to optical line terminal, and the method includes:
Detect the time synchronizing signal between this optical line terminal and optical network unit；
When the deviation of described time synchronizing signal exceedes threshold value, send the time to described optical network unit same
Step message.
2. the method for claim 1, it is characterised in that:
Detect the time synchronizing signal between this optical line terminal and optical network unit, including:
With very first time interval, the time synchronizing signal between this optical line terminal and optical network unit is carried out
Detection；
Wherein, described time synchronizing signal carries the clock source information of this optical line terminal, described clock source
Information includes Hyper Frame Number n and time stamp T stamp (n).
3. method as claimed in claim 2, it is characterised in that:
With very first time interval, the time synchronizing signal between this optical line terminal and optical network unit is carried out
Detection, including:
The very first time each time be spaced then, according to currently should to optical network unit send time with
The clock source information (N2, Tstamp (N2)) of step message and the time having been issued to optical network unit last time
The clock source information (N1, Tstamp (N1)) of synchronization message determines the departure of current time synchronizing signal
Tdiff；Wherein, N2, N1 are Hyper Frame Number, and Tstamp (N2), Tstamp (N1) are timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, t is the time difference between adjacent two Hyper Frame Number；|. | for absolute value sign.
4. the method as described in claim 1 or 2 or 3, it is characterised in that:
Time synchronized message is sent to described optical network unit with the second time interval；Wherein, described second
Time interval was spaced more than the described very first time.
5. the method as described in claim 1 or 2 or 3, it is characterised in that:
When optical network unit is activated for the first time, send time synchronized message to described optical network unit.
6. a time synchronized message dispensing device, is applied to optical line terminal, including:
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit；
Message transmission module, for when the deviation of described time synchronizing signal exceedes threshold value, to described light
NE sends time synchronized message.
7. device as claimed in claim 6, it is characterised in that:
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit,
Including:
With very first time interval, the time synchronizing signal between this optical line terminal and optical network unit is carried out
Detection；
Wherein, described time synchronizing signal carries the clock source information of this optical line terminal, described clock source
Information includes Hyper Frame Number n and time stamp T stamp (n).
8. device as claimed in claim 7, it is characterised in that:
Detection module, for the very first time interval between this optical line terminal and optical network unit time
Between synchronizing signal detect, including:
The very first time each time be spaced then, according to currently should to optical network unit send time with
The clock source information (N2, Tstamp (N2)) of step message and the time having been issued to optical network unit last time
The clock source information (N1, Tstamp (N1)) of synchronization message determines the departure of current time synchronizing signal
Tdiff；Wherein, N2, N1 are Hyper Frame Number, and Tstamp (N2), Tstamp (N1) are timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, t is the time difference between adjacent two Hyper Frame Number；|. | for absolute value sign.
9. the device as described in claim 6 or 7 or 8, it is characterised in that:
Message transmission module, is additionally operable to send time synchronized with the second time interval to described optical network unit
Message；Wherein, described second time interval was spaced more than the described very first time.
10. the device as described in claim 6 or 7 or 8, it is characterised in that:
Message transmission module, is additionally operable to when optical network unit is activated for the first time, to described optical-fiber network list
Unit sends time synchronized message.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510264092.9A CN106301646B (en) | 2015-05-21 | 2015-05-21 | A kind of time synchronization message method and device |
| PCT/CN2016/075971 WO2016184225A1 (en) | 2015-05-21 | 2016-03-09 | Method and device for sending time synchronization message |
Applications Claiming Priority (1)
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| CN201510264092.9A CN106301646B (en) | 2015-05-21 | 2015-05-21 | A kind of time synchronization message method and device |
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| CN106301646B CN106301646B (en) | 2019-08-23 |
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| CN110995387A (en) * | 2019-11-28 | 2020-04-10 | 广东邮电职业技术学院 | Method for realizing GPON network bearing high-precision clock |
| CN111787013A (en) * | 2020-07-03 | 2020-10-16 | 中国电子科技集团公司第三十研究所 | Attack monitoring device and method of optical fiber time synchronization system |
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| CN101945305A (en) * | 2009-07-09 | 2011-01-12 | 大唐移动通信设备有限公司 | Method and system for realizing time synchronization |
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| KR101310905B1 (en) * | 2009-11-27 | 2013-09-25 | 한국전자통신연구원 | Optical network terminal, method for time syncronization thereof, optical line termianl, and method for managing network thereof |
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| CN101707505A (en) * | 2008-08-13 | 2010-05-12 | 华为技术有限公司 | Method and device for time synchronization in passive optical network and passive optical network |
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| CN101945305A (en) * | 2009-07-09 | 2011-01-12 | 大唐移动通信设备有限公司 | Method and system for realizing time synchronization |
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| CN111787013A (en) * | 2020-07-03 | 2020-10-16 | 中国电子科技集团公司第三十研究所 | Attack monitoring device and method of optical fiber time synchronization system |
| CN111787013B (en) * | 2020-07-03 | 2022-02-25 | 中国电子科技集团公司第三十研究所 | Attack monitoring device and method of optical fiber time synchronization system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016184225A1 (en) | 2016-11-24 |
| CN106301646B (en) | 2019-08-23 |
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