CN106301646B - A kind of time synchronization message method and device - Google Patents
A kind of time synchronization message method and device Download PDFInfo
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- CN106301646B CN106301646B CN201510264092.9A CN201510264092A CN106301646B CN 106301646 B CN106301646 B CN 106301646B CN 201510264092 A CN201510264092 A CN 201510264092A CN 106301646 B CN106301646 B CN 106301646B
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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
Abstract
The invention discloses a kind of time synchronization message methods, are applied to optical line terminal, this method comprises: detecting the time synchronizing signal between this optical line terminal and optical network unit；When the deviation of the time synchronizing signal is more than threshold value, Xiang Suoshu optical network unit sending time synchronization message.The present invention can guarantee 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 synchronization message sending devices.
Description
Technical field
The present invention relates to technical field of photo communication more particularly to a kind of time synchronization message method and devices.
Background technique
Soft exchange technology is capable of providing big bandwidth and high reliability, passive optical network (Passive Optical
Network, PON) it is a kind of main soft exchange technology, as mainstream access technology, all obtained greatly in the multiple areas in the whole world
Sizable application.
The rapid development of data service has highlighted the requirement to the mobility of data access, and wired, wireless fusion will
The requirement that user can preferably be met, improves the experience of user.PON technology has data, voice and time division multiple acess (Time
Division Multiplex, referred to as TDM) Full-Services access ability, it can satisfy the wireless access demand of continuous evolution.It is special
It is not in microcellulor, Home eNodeB access application, the convergence property of PON can make whole network be methodically arranged, is easy for construction, manage
Reason is efficient.
In the related technology, the method for time synchronization is carried out in PON network are as follows: optical line terminal (Optical Line
Terminal, referred to as OLT) by external clock (for example, GPS clock) signal or from network accurate timing agreement (Precision
Time Protocol, referred to as PTP) time for restoring in message generates a time synchronization message, then, pass through business, pipe
Reason or data link layer channel by the time synchronization message be sent to optical network unit (Optical Network Unit,
Referred to as ONU).
G.988.9.12.2 the time synchronization message that OLT is sent to ONU, including two parts, first part are defined in
(4 byte) is super frame N, that is, super-frame number device, second part (10 byte) is TstampN, that is, timestamp.
When ONU downlink reception is to n-th superframe super frame, according to the time synchronization message (N, TstampN) received, in conjunction with
The synchronization mechanism of PON system itself generates local zone time, achievees the purpose that time synchronization.
As a kind of point-to-multipoint system, OLT controls the opportunity to ONU sending time synchronization message.G984.3
Amd2 suggests at least synchronizing within 24 hours once, and synchronizes once when ONU is activated for the first time.In order to ensure OLT the and ONU time
Continued synchronization, generally, with Fixed Time Interval sending time synchronization message.
But if clock information is changed without being bound to cause ONU recovered clock to Fixed Time Interval on OLT
It is inconsistent with OLT clock information.In this way, the case where just will appear time irreversibility on OLT and ONU, to seriously affect PON
The business such as the upper TDM dependent on Time Synchronization Mechanism.If simple unlimited reduce sends interval, a large amount of OMCI (ONU is had
Management and Control Interface, optical network unit management control interface) interacting message, particularly with OLT
For, multiple many meaningless OMCI message.
In conclusion the control method that the above time synchronization message is sent has when realizing can not under existing scene
, especially there is drift, error in OLT clock source or in the case where other losing locks in the defects and limitations avoided, OLT and
ONU may have longer time section internal clock not to be able to maintain synchronization, need to improve.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of time synchronization message method and devices, can guarantee
The time continued synchronization of optical line terminal OLT and optical network unit ONU in passive optical network.
In order to solve the above-mentioned technical problems, the present invention provides a kind of time synchronization message methods, are applied to light
Road terminal, this method comprises:
Detect the time synchronizing signal between this optical line terminal and optical network unit；
When the deviation of the time synchronizing signal is more than threshold value, Xiang Suoshu optical network unit sending time synchronization message.
Further, this method further includes following features:
Detect the time synchronizing signal between this optical line terminal and optical network unit, comprising:
The time synchronizing signal between this optical line terminal and optical network unit is detected with first time interval；
Wherein, the time synchronizing signal carries the clock source information of this optical line terminal, and the clock source information includes
Hyper Frame Number n and time stamp T stamp (n).
Further, this method further includes following features:
The time synchronizing signal between this optical line terminal and optical network unit is detected with first time interval, is wrapped
It includes:
First time interval each time then, according to the time synchronization message that should be currently sent to optical network unit
Clock source information (N2, Tstamp (N2)) and last time have been issued to the clock source information of the time synchronization message of optical network unit
(N1, Tstamp (N1)) determines the departure T of current time synchronization signaldiff；Wherein, N2, N1 are Hyper Frame Number, Tstamp
(N2), Tstamp (N1) is timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, time difference of the t between two neighboring Hyper Frame Number；| | it is absolute value sign.
Further, this method further includes following features:
With the second time interval to the optical network unit sending time synchronization message；Wherein, second time interval
Greater than the first time interval.
Further, this method further includes following features:
When optical network unit is activated for the first time, Xiang Suoshu optical network unit sending time synchronization message.
In order to solve the above-mentioned technical problems, the present invention provides a kind of time synchronization message sending devices, are applied to light
Road terminal, comprising:
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit；
Message transmission module, when being more than threshold value for the deviation in the time synchronizing signal, Xiang Suoshu optical network unit
Sending time synchronization message.
Further, which further includes following features:
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit, comprising:
The time synchronizing signal between this optical line terminal and optical network unit is detected with first time interval；
Wherein, the time synchronizing signal carries the clock source information of this optical line terminal, and the clock source information includes
Hyper Frame Number n and time stamp T stamp (n).
Further, which further includes following features:
Detection module, for being believed with first time interval the time synchronization between this optical line terminal and optical network unit
It number is detected, comprising:
First time interval each time then, according to the time synchronization message that should be currently sent to optical network unit
Clock source information (N2, Tstamp (N2)) and last time have been issued to the clock source information of the time synchronization message of optical network unit
(N1, Tstamp (N1)) determines the departure T of current time synchronization signaldiff；Wherein, N2, N1 are Hyper Frame Number, Tstamp
(N2), Tstamp (N1) is timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, time difference of the t between two neighboring Hyper Frame Number；| | it is absolute value sign.
Further, which further includes following features:
Message transmission module is also used to the second time interval to the optical network unit sending time synchronization message；Its
In, second time interval is greater than the first time interval.
Further, which further includes following features:
Message transmission module is also used to when optical network unit is activated for the first time, when Xiang Suoshu optical network unit is sent
Between synchronization message.
Compared with prior art, a kind of time synchronization message method provided by the invention and device, by detecting
To the time synchronizing signal between this optical line terminal and optical network unit deviation be more than threshold value when, to optical network unit send
Time synchronization message can guarantee that the time of optical line terminal OLT and optical network unit ONU continues together in passive optical network
Step, in the case where avoiding OLT clock source from drift, error or other losing locks occur, OLT and ONU are because wait next time
Synchronization message sending cycle and cause long period clock not to be able to maintain synchronization.
Detailed description of the invention
Fig. 1 is a kind of flow chart of time synchronization message method of the embodiment of the present invention.
Fig. 2 is a kind of structural schematic diagram of time synchronization message sending device of the embodiment of the present invention.
Fig. 3 is that the present invention applies a kind of exemplary information exchange figure of time synchronization message method.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature can mutual any combination.
As shown in Figure 1, it is whole to be applied to optical link the embodiment of the invention provides a kind of time synchronization message method
End, this method comprises:
S10 detects the time synchronizing signal between this optical line terminal and optical network unit；
S20, when the deviation of the time synchronizing signal is more than threshold value, Xiang Suoshu optical network unit sending time, which synchronizes, to disappear
Breath；
The method can also include following features:
Wherein, the time synchronizing signal between this optical line terminal and optical network unit is detected, comprising:
The time synchronizing signal between this optical line terminal and optical network unit is detected with first time interval；
Wherein, the time synchronizing signal carries the clock source information of this optical line terminal, and the clock source information includes
Hyper Frame Number n and time stamp T stamp (n)；
Wherein, the deviation of the time synchronizing signal may be since drift, error occurs in the clock source of optical line terminal
Or caused by the case where other losing locks；
Wherein, the time synchronizing signal between this optical line terminal and optical network unit is examined with first time interval
It surveys, comprising:
First time interval each time then, according to the time synchronization message that should be currently sent to optical network unit
Clock source information (N2, Tstamp (N2)) and last time have been issued to the clock source information of the time synchronization message of optical network unit
(N1, Tstamp (N1)) determines the departure T of current time synchronization signaldiff；Wherein, N2, N1 are Hyper Frame Number, Tstamp
(N2), Tstamp (N1) is timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, time difference of the t between two neighboring Hyper Frame Number；| | it is absolute value sign；
Such as, it is assumed that per second to have 8000 downlink frames, then t is 1/8000 second；
Wherein, the method also includes:
With the second time interval to the optical network unit sending time synchronization message；Wherein, second time interval
Greater than the first time interval；
Wherein, the method also includes:
When optical network unit is activated for the first time, Xiang Suoshu optical network unit sending time synchronization message；
Using the method for the invention, what the second time interval can be set is very big, and first time interval is set very
Small (for example, time of one superframe in interval).On OLT clock source change (for example, clock source occur drift, error or
The case where other losing locks) when, ONU without waiting for the second time interval sending cycle, but by every first time interval
Time synchronizing signal separate-blas estimation, it is quickly synchronous with OLT holding.This processing mode had both reduced interacting message, had rationally utilized
Resource can guarantee that the time of OLT and ONU are consistent again.
As shown in Fig. 2, it is whole to be applied to optical link the embodiment of the invention provides a kind of time synchronization message sending device
End, comprising:
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit；
Message transmission module, when being more than threshold value for the deviation in the time synchronizing signal, Xiang Suoshu optical network unit
Sending time synchronization message；
Described device can also include following features:
Wherein, detection module is wrapped for detecting the time synchronizing signal between this optical line terminal and optical network unit
It includes:
The time synchronizing signal between this optical line terminal and optical network unit is detected with first time interval；
Wherein, the time synchronizing signal carries the clock source information of this optical line terminal, and the clock source information includes
Hyper Frame Number n and time stamp T stamp (n)；
Wherein, the deviation of the time synchronizing signal may be since drift, error occurs in the clock source of optical line terminal
Or caused by the case where other losing locks；
Wherein, detection module, for first time interval to the time between this optical line terminal and optical network unit
Synchronization signal is detected, comprising:
First time interval each time then, according to the time synchronization message that should be currently sent to optical network unit
Clock source information (N2, Tstamp (N2)) and last time have been issued to the clock source information of the time synchronization message of optical network unit
(N1, Tstamp (N1)) determines the departure T of current time synchronization signaldiff；Wherein, N2, N1 are Hyper Frame Number, Tstamp
(N2), Tstamp (N1) is timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N1) |；
Wherein, time difference of the t between two neighboring Hyper Frame Number；| | it is absolute value sign；
Wherein, message transmission module, is also used to be synchronized with the second time interval to the optical network unit sending time and disappears
Breath；Wherein, second time interval is greater than the first time interval；
Wherein, message transmission module is also used to when optical network unit is activated for the first time, Xiang Suoshu optical network unit hair
Send time synchronization message.
Using example
Using the method for the above embodiment of the present invention, method for synchronizing time between OLT and ONU includes the following steps:
S101:OLT calculates the when fixed sending cycle Tcycle (periodically to ONU sending time synchronization message) arrives
N1 superframe super frame reaches corresponding time stamp T stampN1 when ONU；OLT sends the N1-X superframe to ONU
When Super frame N1-X, by OMCI message sending time synchronization message to ONU, wherein carrying the clock source information of OLT
(N1,TstampN1)；
S102:OLT sends the N1 super frame to ONU；ONU when the N1 super frame is reached, according to
(N1, the TstampN1) received before recovers temporal information；
When S103:OLT sends the N2-X superframe Super frame N2-X to ONU, according to should currently be sent to ONU
Clock source information (N2, Tstamp (the N2)) time synchronization that had been issued to optical network unit with last time of time synchronization message disappear
The clock source information (N1, Tstamp (N1)) of breath determines the departure T of current time synchronization signaldiff, such as TdiffBeyond threshold value,
By OMCI message sending time synchronization message to ONU, wherein carrying the clock source information (N2, TstampN2) of OLT；
S104:OLT sends the N2 super frame to ONU；ONU when the N2 super frame is reached, according to
(N2, the TstampN2) received before recovers temporal information；
S105:OLT sends the N3-X superframe Super when next fixed sending cycle Tcycle arrives, to ONU
When frame N3-X, by OMCI message sending time synchronization message to ONU, wherein carry OLT clock source information (N3,
TstampN3)；
S106:OLT sends the N3 super frame to ONU；ONU when the N3 super frame is reached, according to
(N3, the TstampN3) received before recovers temporal information；
A kind of time synchronization message method provided by the above embodiment and device, by detecting this optical link end
When the deviation of time synchronizing signal between end and optical network unit is more than threshold value, synchronizes and disappear to optical network unit sending time
Breath, can guarantee the time continued synchronization of optical line terminal OLT and optical network unit ONU in passive optical network, avoid OLT
In the case that drift, error or other losing locks occurs in clock source, OLT and ONU are because wait next time synchronization message hair
Send the period and the long period of causing clock is not able to maintain synchronization.
Those of ordinary skill in the art will appreciate that all or part of the steps in the above method can be instructed by program
Related hardware is completed, and described program can store in computer readable storage medium, such as read-only memory, disk or CD
Deng.Optionally, one or more integrated circuits also can be used to realize, accordingly in all or part of the steps of above-described embodiment
Ground, each module/unit in above-described embodiment can take the form of hardware realization, can also use the shape of software function module
Formula is realized.The present invention is not limited to the combinations of the hardware and software of any particular form.
It should be noted that the invention may also have other embodiments, without departing substantially from spirit of that invention and its essence
In the case of, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these are corresponding
Change and modification all should fall within the scope of protection of the appended claims of the present invention.
Claims (6)
1. a kind of time synchronization message method is applied to optical line terminal, this method comprises:
Detect the time synchronizing signal between this optical line terminal and optical network unit；
When the deviation of the time synchronizing signal is more than threshold value, Xiang Suoshu optical network unit sending time synchronization message；
Detect the time synchronizing signal between this optical line terminal and optical network unit, comprising:
The time synchronizing signal between this optical line terminal and optical network unit is detected with first time interval；
Wherein, the time synchronizing signal carries the clock source information of this optical line terminal, and the clock source information includes superframe
Number n and time stamp T stamp (n)；
The time synchronizing signal between this optical line terminal and optical network unit is detected with first time interval, comprising:
First time interval each time then, according to currently should to optical network unit send time synchronization message clock
Source information (N2, Tstamp (N2)) and last time have been issued to the time synchronization message of optical network unit clock source information (N1,
Tstamp (N1)) determine the departure T of current time synchronization signaldiff；Wherein, N2, N1 be Hyper Frame Number, Tstamp (N2),
Tstamp (N1) is timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N2) |；
Wherein, time difference of the t between two neighboring Hyper Frame Number；| | it is absolute value sign.
2. the method as described in claim 1, it is characterised in that:
With the second time interval to the optical network unit sending time synchronization message；Wherein, second time interval is greater than
The first time interval.
3. the method as described in claim 1, it is characterised in that:
When optical network unit is activated for the first time, Xiang Suoshu optical network unit sending time synchronization message.
4. a kind of time synchronization message sending device is applied to optical line terminal, comprising:
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit；
Message transmission module, when being more than threshold value for the deviation in the time synchronizing signal, Xiang Suoshu optical network unit is sent
Time synchronization message；
Detection module, for detecting the time synchronizing signal between this optical line terminal and optical network unit, comprising:
The time synchronizing signal between this optical line terminal and optical network unit is detected with first time interval；
Wherein, the time synchronizing signal carries the clock source information of this optical line terminal, and the clock source information includes superframe
Number n and time stamp T stamp (n)；
Detection module, for first time interval to the time synchronizing signal between this optical line terminal and optical network unit into
Row detection, comprising:
First time interval each time then, according to currently should to optical network unit send time synchronization message clock
Source information (N2, Tstamp (N2)) and last time have been issued to the time synchronization message of optical network unit clock source information (N1,
Tstamp (N1)) determine the departure T of current time synchronization signaldiff；Wherein, N2, N1 be Hyper Frame Number, Tstamp (N2),
Tstamp (N1) is timestamp；
Wherein, Tdiff=| Tstamp (N1)+(N2-N1) * t-Tstamp (N2) |；
Wherein, time difference of the t between two neighboring Hyper Frame Number；| | it is absolute value sign.
5. device as claimed in claim 4, it is characterised in that:
Message transmission module is also used to the second time interval to the optical network unit sending time synchronization message；Wherein, institute
The second time interval is stated greater than the first time interval.
6. device as claimed in claim 4, it is characterised in that:
Message transmission module is also used to when optical network unit is activated for the first time, and Xiang Suoshu optical network unit sending time is same
Walk message.
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| 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 |
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| CN110995387B (en) * | 2019-11-28 | 2021-05-25 | 广东邮电职业技术学院 | Method for realizing GPON network bearing high-precision clock |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431385B (en) * | 2008-08-26 | 2012-03-07 | 中兴通讯股份有限公司 | Frequency and time synchronization method for passive optical network |
| CN102932905A (en) * | 2011-08-10 | 2013-02-13 | 中兴通讯股份有限公司 | Method and system for realizing self-compensation 1588 link asynchronous time delay |
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| CN101707505B (en) * | 2008-08-13 | 2013-08-28 | 华为技术有限公司 | Method and device for time synchronization in passive optical network and passive optical network |
| 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 |
| 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 |
| KR102060496B1 (en) * | 2013-02-12 | 2019-12-30 | 삼성전자주식회사 | Terminal apparatus and method for time synchronization |
| CN104486017B (en) * | 2014-11-07 | 2017-02-15 | 中国电子科技集团公司第二十八研究所 | Satellite time service multi-node synchronization monitoring method based on IP light transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431385B (en) * | 2008-08-26 | 2012-03-07 | 中兴通讯股份有限公司 | Frequency and time synchronization method for passive optical network |
| CN102932905A (en) * | 2011-08-10 | 2013-02-13 | 中兴通讯股份有限公司 | Method and system for realizing self-compensation 1588 link asynchronous time delay |
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