CN106027190B - A kind of clock synchronizing method and device - Google Patents
A kind of clock synchronizing method and device Download PDFInfo
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- CN106027190B CN106027190B CN201610343658.1A CN201610343658A CN106027190B CN 106027190 B CN106027190 B CN 106027190B CN 201610343658 A CN201610343658 A CN 201610343658A CN 106027190 B CN106027190 B CN 106027190B
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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
- 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
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
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Abstract
The embodiment of the invention discloses a kind of clock synchronizing method and device, this method and device are applied to the network that light-carried wireless RoF is merged with passive optical network PON, and this method includes：The atomic clock synchronizing signal of simulation acquired in it is sent to network module by mixing optical line terminal OLT by RoF link, and the atomic clock synchronizing signal of the simulation is extracted by network module；Information at the time of network module is recorded by it calculates clock adjustment information, adjusts the clock of network module.This method and device are in the network that RoF is merged with PON, pass through the clock synchronization scheme based on RoF technologies, utilize the accurate simulation atomic clock synchronizing signal acquired in RoF link transmission mixing OLT, the atomic clock synchronizing signal of the simulation is extracted by network module, so as to effectively avoid the problem of dtmf distortion DTMF after clock sync signal digitlization, the clock synchronization accuracy for improving the network module of access side realizes that accurately network clocking synchronizes.
Description
Technical field
It is the present invention relates to network communication technology field, more particularly to a kind of to be merged with passive optical network based on light-carried wireless
The clock synchronizing method and device of network.
Background technology
During network communication, in order to ensure communication quality, make business normal operation, must be requested that accurately when network
Clock synchronizes, that is, time or frequency between the network equipment is required to be maintained in rational error level.Network clocking synchronizes
Including time synchronization and Frequency Synchronization.Especially in wireless access system, it is desirable that each base-station node strictly keeps wireless interface
Synchronization accuracy, this requires each base-station nodes to extract clock to ensure its synchronization by GPS.However, using the GPS clock side of synchronization
Case require antenna have it is good receiver, which can receive useful signal, just can guarantee to empty visual field, which increase the difficulty of GPS addressings,
And need to set up feeder line between antenna and base station, increase erection cost.In addition, base station does not have the clock of other backups, it is
Reliability of uniting is relatively low.Although can solve that time synchronization cost is excessively high using IEEE 1588V2 clock synchronization protocol and precision not
The problems such as sufficient, synchronization accuracy can reach submicrosecond grade, still, based on this agreement transmission be dagital clock signal, i.e., when
It in clock synchronizing process, first has to be digitized clock signal, this process will necessarily cause many attributes in clock signal
Loss, lead to the clock signal distortion that the network module of receiving terminal identifies, affect to synchronization delayed time and precision,
It is final to influence communication quality.
Invention content
The embodiment of the invention discloses a kind of based on light-carried wireless side synchronous with the clock for the network that passive optical network merges
Method and device, to improve the clock synchronization accuracy of the network module of access side.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of clock synchronizing method, be applied to light-carried wireless RoF with
Mixing optical line terminal OLT in the network of passive optical network PON fusion, the method includes：
To network module tranmitting data register sync message, so that the network module records the arrival of the clock sync message
Moment T2, while obtaining the atomic clock synchronizing signal of simulation；
The atomic clock synchronizing signal of the simulation is sent to the network module by RoF link, so that the net
Network module sends out moment T by what the atomic clock synchronizing signal of the simulation extracted the clock sync message1And it records；
The delay request message that the network module is sent is received, the arrival time T of the delay request message is recorded4,
The network module records the delay request message and sends out moment T3；
It is sent to the network module and carries the arrival time T4Delay request feedback message so that the network mould
Block obtains and records the arrival time T4, and moment T is sent out by the clock sync message1, the clock sync message
Arrival time T2, the delay request message send out moment T3And the arrival time T of the delay request message4, meter
Clock adjustment information is calculated, the clock of the network module is adjusted by the clock adjustment information.
Optionally, described that moment T is sent out by the clock sync message1, the clock sync message arrival when
Carve T2, the delay request message send out moment T3And the arrival time T of the delay request message4, calculate clock tune
Whole information, including：
The network module passes through T2-T1The time deviation between the network module and the mixing OLT is calculated
Toffset；
Pass through following formula：
Tdelay=(T2-T1+T4-T3)/2
T’offset=(T2-T1-T4+T3)/2
Sync message propagation delay time T is calculateddelayThe modified network module and it is described mixing OLT between when
Between deviation T 'offset。
Optionally, optical splitter is equipped in the RoF link, the mixing OLT utilizes the optical splitter by the simulation
Atomic clock synchronous transmission of signal is to the different network modules.
Optionally, the network module includes one or more of mixing ONU, ONU-BS, BS.
In order to achieve the above objectives, the embodiment of the invention also discloses a kind of clock synchronizing methods, are applied to light-carried wireless RoF
Network module in the network merged with passive optical network PON, the method includes：
The clock sync message that mixing optical line terminal OLT is sent is received, and records the arrival of the clock sync message
Moment T2, the mixing OLT obtained while sending the clock sync message simulation atomic clock synchronizing signal；
The atomic clock synchronizing signal for receiving the simulation that the mixing OLT is sent by RoF link, passes through the mould
What quasi- atomic clock synchronizing signal extracted the clock sync message sends out moment T1And it records；
Delay request message is sent to the mixing OLT, so that the mixing OLT records arriving for the delay request message
Up to moment T4, record the delay request message sends out moment T3；
Receive the mixing OLT transmissions carries the arrival time T4Delay request feedback message, obtain and record
The arrival time T4, and moment T is sent out by the clock sync message1, the clock sync message arrival time
T2, the delay request message send out moment T3And the arrival time T of the delay request message4, calculate clock adjustment
Information is adjusted the clock of the network module by the clock adjustment information.
Optionally, described that moment T is sent out by the clock sync message1, the clock sync message arrival when
Carve T2, the delay request message send out moment T3And the arrival time T of the delay request message4, calculate clock tune
Whole information, including：
Pass through T2-T1The time deviation T between the network module and the mixing OLT is calculatedoffset；
Pass through following formula：
Tdelay=(T2-T1+T4-T3)/2
T’offset=(T2-T1-T4+T3)/2
Sync message propagation delay time T is calculateddelayThe modified network module and it is described mixing OLT between when
Between deviation T 'offset。
Optionally, optical splitter is equipped in the RoF link, the mixing OLT utilizes the optical splitter by the simulation
Atomic clock synchronous transmission of signal is to the different network modules.
Optionally, the network module includes one or more of mixing ONU, ONU-BS, BS.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of clock synchronization apparatus, be applied to light-carried wireless RoF with
Mixing optical line terminal OLT in the network of passive optical network PON fusion comprising：
First transmission unit is used for network module tranmitting data register sync message, so that described in network module record
The arrival time T of clock sync message2；
Synchronous signal obtaining unit, the atomic clock for obtaining simulation while sending the clock sync message are same
Walk signal；
Second transmission unit, for the atomic clock synchronizing signal of the simulation to be sent to the net by RoF link
Network module, so that the network module extracts the hair of the clock sync message by the atomic clock synchronizing signal of the simulation
Go out moment T1And it records；
First receiving unit, the delay request message sent for receiving the network module, the network module record
The delay request message sends out moment T3；
First recording unit, the arrival time T for recording the delay request message4；And
Feedback unit carries the arrival time T for being sent to the network module4Delay request feedback message,
So that the network module obtains and records the arrival time T4, and moment T is sent out by the clock sync message1, institute
State the arrival time T of clock sync message2, the delay request message send out moment T3And the delay request message
Arrival time T4, clock adjustment information is calculated, the clock of the network module is adjusted by the clock adjustment information.
In order to achieve the above objectives, the embodiment of the invention also discloses a kind of clock synchronization apparatus, are applied to light-carried wireless RoF
Network module in the network merged with passive optical network PON comprising：
Second receiving unit, the clock sync message sent for receiving mixing optical line terminal OLT；
Second recording unit, the arrival time T for recording the clock sync message2；
Third receiving unit obtains and leads to while sending the clock sync message for receiving the mixing OLT
Cross the atomic clock synchronizing signal of the simulation of RoF link transmission；
Third recording unit, for extracting the clock sync message by the atomic clock synchronizing signal of the simulation
Send out moment T1And it records；
Third transmission unit, for sending delay request message to the mixing OLT, so that the mixing OLT records institute
State the arrival time T of delay request message4；
4th recording unit sends out moment T for recording the delay request message3；
4th receiving unit, the arrival for postponing request message with the transmission sent for receiving the mixing OLT
Moment T4Delay request feedback message；
5th recording unit, for obtaining and recording the arrival time T4；
Clock adjustment unit, for sending out moment T by the clock sync message1, the clock sync message
Arrival time T2, the delay request message send out moment T3And the arrival time T of the delay request message4, calculate
Clock adjustment information is adjusted the clock of the network module by the clock adjustment information.It is provided in an embodiment of the present invention to be based on light
The clock synchronizing method and device for carrying the network that wireless RoF is merged with passive optical network PON, in the network that RoF is merged with PON
In, by the clock synchronization scheme based on RoF technologies, that is, utilize the timing that RoF link transmission mixing OLT is obtained extremely accurate
Atomic clock signal is simulated, the atomic clock signal of the simulation is extracted by network module, so as to effectively clock be avoided to synchronize
Problem of dtmf distortion DTMF after signal digitlization improves the clock synchronization accuracy of the network module of access side, realizes accurately network clocking
It is synchronous.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the network architecture that RoF is merged with PON in the prior art；
Fig. 2 is a kind of flow diagram of clock synchronizing method provided in an embodiment of the present invention；
Fig. 3 is message transmission process provided in an embodiment of the present invention；
Fig. 4 is the flow diagram of another clock synchronizing method provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of clock synchronization apparatus provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another clock synchronization apparatus provided in an embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention is the real-time performance merged with passive optical network PON based on light-carried wireless RoF, and Fig. 1 is
The network architecture that RoF is merged with PON in the prior art is first below done simply the network architecture merged with PON based on RoF
It introduces.
RoF technologies are that radiofrequency signal subcarrier is modulated to the technology that realization technology fiber optic network transmits on light carrier,
The advantages of taking full advantage of optical fiber electromagnetism interference, efficiently solves that power attenuation that wireless signal transmits in an atmosphere is big to ask
Topic.In addition to this, RoF technologies make telepoint base station greatly simplify, and realize that the concentration of function, device and equipment are shared in central office
And the dynamic allocation of spectral bandwidth resource, to reduce the cost of entire broadband wireless access.The development of next generation communication network
Trend requires have enough bandwidth and higher flexibility.Both the baseband signal of optical fiber transmission PON had been needed, while being also required to use up
Fibre transmission RoF signals, preferably provide broadband wireless access business to the user.Therefore RoF and PON fusions transmission platform is integrated
Have very important significance, wired and wireless service set is integrated into consolidated network structure, reduce deployment cost, carries out transparent
Upgrading service, meet the business demand of different terminals user.
Central station (CS) in RoF systems and the optical line terminal (OLT) in PON, the mixed light in base station (BS) and PON
Network element (ONU) has higher compatibility, and is both based on optical fiber and transmits, this can solve high-rate wireless and connect
Enter with the unmatched problem of intelligent acess bandwidth, therefore for both fusion provide the basis of physical structure.
At present RoF and PON fusion have it is several under several schemes；First, wired baseband signal is held by the light carrier of optical millimeter wave
It carries, and wireless access signal is carried by the sideband of optical millimeter wave；Second is that realizing wired and wireless fusion by orthogonal modulation.Third,
Lasing light emitter is set in base station, and carries out generating wired and wireless access signal with poor heterodyne detection.Due to having in first two scheme
Line and wireless signal occupy different transmission signals so that channel resource cannot be fully utilized.And the third scheme is in base station
Introduce the active equipments such as laser so that the cost of receiving terminal increases.
Fig. 2 is a kind of flow diagram of clock synchronizing method provided in an embodiment of the present invention, which answers
Mixing optical line terminal OLT in the network merged with passive optical network PON for light-carried wireless RoF mixes optical line terminal
OLT can transmit analog signal, can also transmit the optical line terminal of digital signal, include the following steps：
S201：To network module tranmitting data register sync message Sync, so that the network module records the clock and synchronizes
The arrival time T of message Sync2, while obtaining the atomic clock synchronizing signal Follow_up of simulation.
Wherein, the network module is mixing ONU, ONU-BS and BS.It is emphasized that above-mentioned given network mould
Block is merely exemplary, should not constitute the restriction to the embodiment of the present invention, and network module can be one.
It is emphasized that the atomic clock synchronizing signal of simulation is the electromagnetic wave sent out at the atomic clock moment, obtain
The quasi- atomic clock synchronizing signal of modulus is referred to atomic clock acquisition methods in the prior art, such as：It can be by right
The pulse signal frequency marking that atomic clock generates counts to obtain.It does not limit herein specifically.
S202：The atomic clock synchronizing signal Follow_up of the simulation is sent to the network mould by RoF link
Block, so that the network module extracts the clock by the atomic clock synchronizing signal Follow_up of the simulation synchronizes report
Literary Sync's sends out moment T1And it records.
Wherein, atomic clock synchronizing signal is carried by radiofrequency signal, and mixing OLT sends the atomic clock synchronizing signal of simulation
It is that the atomic clock synchronizing signal of the simulation is modulated on light carrier, each network module is transferred to by RoF link.
In a kind of realization method, optical splitter can be equipped in RoF link, mixing OLT will be described using the optical splitter
The atomic clock synchronous transmission of signal of simulation is to the different network modules.
S203：The delay request message Delay_req that the network module is sent is received, the delay request message is recorded
The arrival time T of Delay_req4, what the network module recorded the delay request message Delay_req sends out moment T3。
S204：It is sent to the network module and carries the arrival time T4Delay request feedback message Delay_
Resq, so that the network module obtains and records the arrival time T4, and by the clock sync message when sending out
Carve T1, the clock sync message arrival time T2, the delay request message send out moment T3And the delay is asked
Seek the arrival time T of message4, clock adjustment information is calculated, the clock of the network module is adjusted by the clock adjustment information.
Wherein, network module calculates clock adjustment information, including：
First stage：Pass through T2-T1Each network module is calculated and mixes the time deviation T between OLToffset；
Second stage：Pass through following formula：
Tdelay=(T2-T1+T4-T3)/2
T’offset=(T2-T1-T4+T3)/2
Sync message propagation delay time T is calculateddelayTime deviation between modified each network module and mixing OLT
T’offset。
Calculate time deviation T 'offsetAfterwards, each network module can be according to time deviation T 'offsetTo adjust adjustment institute
The clock of network module is stated, specific clock adjustment process can be same as the prior art, and which is not described herein again.
Each network module completes a clock synchronization as a result,.
It should be noted that when the quantity of network module is 2 or more situations, each network module is needed according to upper
The correlation step for stating first stage and second stage calculates separately adjustment information corresponding with each network module：(1) time
Deviation Toffset, (2) sync message propagation delay time Tdelay(3) the time deviation T ' between OLT is mixedoffset, and according to each
The corresponding adjustment information of network module (1)-(3) adjust the clock of each network module.
Although it is emphasized that each network module all have recorded clock sync message send out moment T1, clock it is same
Walk the arrival time T of message2, delay request message send out moment T3And the arrival time T of delay request message4, still,
Since each network module records corresponding time respectively, T1、T2、T3、T4Concrete numerical value might not be identical.
Fig. 3 shows message transmission process provided in an embodiment of the present invention.
As shown in figure 3, mixing OLT to network module tranmitting data register sync message Sync, so that the network module records
The arrival time T of the clock sync message Sync2, while obtaining the atomic clock synchronizing signal Follow_up of simulation；
The atomic clock synchronizing signal Follow_up of the simulation is sent to the network by mixing OLT by RoF link
Module synchronizes so that the network module extracts the clock by the atomic clock synchronizing signal Follow_up of the simulation
Message Sync's sends out moment T1And it records；
Mixing OLT receives the delay request message Delay_req that the network module is sent, and records the delay request report
The arrival time T of literary Delay_req4, what the network module recorded the delay request message Delay_req sends out moment T3；
OLT is mixed to send with the arrival time T to the network module4Delay request feedback message Delay_
Resq, so that the network module obtains and records the arrival time T4。
Fig. 4 is the flow diagram of another clock synchronizing method provided in an embodiment of the present invention, the clock synchronizing method
Network module in the network merged with passive optical network PON applied to light-carried wireless RoF, includes the following steps：
S401：The clock sync message that mixing optical line terminal OLT is sent is received, and records the clock sync message
Arrival time T2, the mixing OLT obtained while sending the clock sync message simulation atomic clock synchronizing signal.
S402：The atomic clock synchronizing signal for receiving the simulation that the mixing OLT is sent by RoF link, passes through
What the atomic clock synchronizing signal of the simulation extracted the clock sync message sends out moment T1And it records.
S403：Delay request message is sent to the mixing OLT, so that the mixing OLT records the delay request report
The arrival time T of text4, record the delay request message sends out moment T3。
S404：Receive the mixing OLT transmissions carries the arrival time T4Delay request feedback message, obtain simultaneously
Record the arrival time T4, and moment T is sent out by the clock sync message1, the clock sync message arrival when
Carve T2, the delay request message send out moment T3And the arrival time T of the delay request message4, calculate clock tune
Whole information is adjusted the clock of the network module by the clock adjustment information.
By the above embodiments as it can be seen that clock synchronizing method provided in an embodiment of the present invention, in the net that RoF is merged with PON
Under network framework, by the clock synchronization scheme based on RoF technologies, that is, the timing that RoF link transmission mixing OLT is obtained is utilized extremely
Accurate simulation atomic clock synchronizing signal, the atomic clock synchronizing signal of the simulation is extracted by network module, so as to have
Effect avoids the problem of dtmf distortion DTMF after clock sync signal digitlization, improves the clock synchronization accuracy of the network module of access side, realizes
Accurately network clocking synchronizes.
Fig. 5 is a kind of structural schematic diagram of mixing optical line terminal OLT provided in an embodiment of the present invention, and shown in Fig. 2
Flow is corresponding, which is applied to the network that light-carried wireless RoF is merged with passive optical network PON, packet
It includes：
First transmission unit 501 is used for network module tranmitting data register sync message, so that the network module records institute
State the arrival time T of clock sync message2；
Synchronous signal obtaining unit 502, the atomic time for obtaining simulation while sending the clock sync message
Clock synchronizing signal；
Second transmission unit 503, it is described for being sent to the atomic clock synchronizing signal of the simulation by RoF link
Network module, so that the network module extracts the clock sync message by the atomic clock synchronizing signal of the simulation
Send out moment T1And it records；
First receiving unit 504, the delay request message sent for receiving the network module, the network module note
That records the delay request message sends out moment T3；
First recording unit 505, the arrival time T for recording the delay request message4；And
Feedback unit 506 carries the arrival time T for being sent to the network module4Delay request feedback report
Text, so that the network module obtains and records the arrival time T4, and the moment is sent out by the clock sync message
T1, the clock sync message arrival time T2, the delay request message send out moment T3And the delay request
The arrival time T of message4, clock adjustment information is calculated, the clock of the network module is adjusted by the clock adjustment information.
Fig. 6 is a kind of structural schematic diagram of network module provided in an embodiment of the present invention, and flow as shown in fig. 4 is opposite
It answers, which is applied to the network that light-carried wireless RoF is merged with passive optical network PON comprising：
Second receiving unit 601, the clock sync message sent for receiving mixing optical line terminal OLT；
Second recording unit 602, the arrival time T for recording the clock sync message2；
Third receiving unit 603 obtains simultaneously for receiving the mixing OLT while sending the clock sync message
Pass through the atomic clock synchronizing signal for the simulation that RoF link is sent；
Third recording unit 604 synchronizes report for extracting the clock by the atomic clock synchronizing signal of the simulation
Text sends out moment T1And it records；
Third transmission unit 605, for sending delay request message to the mixing OLT, so that the mixing OLT is recorded
The arrival time T of the delay request message4；
4th recording unit 606 sends out moment T for recording the delay request message3；
4th receiving unit 607, the arriving with the transmission delay request message sent for receiving the mixing OLT
Up to moment T4Delay request feedback message；
5th recording unit 608, for obtaining and recording the arrival time T4；
Clock adjustment unit 609, for sending out moment T by the clock sync message1, the clock sync message
Arrival time T2, the delay request message send out moment T3And the arrival time T of the delay request message4, meter
Clock adjustment information is calculated, the clock of the network module is adjusted by the clock adjustment information.
By the above embodiments as it can be seen that clock synchronization apparatus provided in an embodiment of the present invention, in the net that RoF is merged with PON
Under network framework, by the clock synchronization scheme based on RoF technologies, that is, the timing that RoF link transmission mixing OLT is obtained is utilized extremely
Accurate simulation atomic clock synchronizing signal, the atomic clock synchronizing signal of the simulation is extracted by network module, so as to have
Effect avoids the problem of dtmf distortion DTMF after clock sync signal digitlization, improves the clock synchronization accuracy of the network module of access side, realizes
Accurately network clocking synchronizes.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for device reality
For applying example, since it is substantially similar to the method embodiment, so description is fairly simple, related place is referring to embodiment of the method
Part explanation.
One of ordinary skill in the art will appreciate that all or part of step in realization above method embodiment is can
It is completed with instructing relevant hardware by program, the program can be stored in computer read/write memory medium,
The storage medium designated herein obtained, such as：ROM/RAM, magnetic disc, CD etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of clock synchronizing method, which is characterized in that be applied to the network that light-carried wireless RoF is merged with passive optical network PON
In mixing optical line terminal OLT, the method includes：
To network module tranmitting data register sync message, so that the network module records the arrival time of the clock sync message
T2, while obtaining the atomic clock synchronizing signal of simulation；
The atomic clock synchronizing signal of the simulation is sent to the network module by RoF link, so that the network mould
Block sends out moment T by what the atomic clock synchronizing signal of the simulation extracted the clock sync message1And it records；
The delay request message that the network module is sent is received, the arrival time T of the delay request message is recorded4, the net
Network module records the delay request message and sends out moment T3；
It is sent to the network module and carries the arrival time T4Delay request feedback message so that the network module obtains
It takes and records the arrival time T4, and moment T is sent out by the clock sync message1, the clock sync message arrives
Up to moment T2, the delay request message send out moment T3And the arrival time T of the delay request message4, when calculating
Clock adjustment information is adjusted the clock of the network module by the clock adjustment information.
2. according to the method described in claim 1, it is characterized in that, described send out moment T by the clock sync message1、
The arrival time T of the clock sync message2, the delay request message send out moment T3And the delay request message
Arrival time T4, clock adjustment information is calculated, including：
The network module passes through T2-T1The time deviation T between the network module and the mixing OLT is calculatedoffset；
Pass through following formula：
Tdelay=(T2-T1+T4-T3)/2
T’offset=(T2-T1-T4+T3)/2
Sync message propagation delay time T is calculateddelayTime between the modified network module and the mixing OLT is inclined
Poor T 'offset。
3. according to the method described in claim 1, it is characterized in that, being equipped with optical splitter, the mixing OLT in the RoF link
Using the optical splitter by the atomic clock synchronous transmission of signal of the simulation to the different network modules.
4. according to the method described in claim 1, it is characterized in that, the network module includes in mixing ONU, ONU-BS, BS
One or more.
5. a kind of clock synchronizing method, which is characterized in that be applied to the network that light-carried wireless RoF is merged with passive optical network PON
In network module, the method includes：
The clock sync message that mixing optical line terminal OLT is sent is received, and records the arrival time of the clock sync message
T2, the mixing OLT obtained while sending the clock sync message simulation atomic clock synchronizing signal；
The atomic clock synchronizing signal for receiving the simulation that the mixing OLT is sent by RoF link, passes through the simulation
What atomic clock synchronizing signal extracted the clock sync message sends out moment T1And it records；
Delay request message is sent to the mixing OLT, when so that the mixing OLT recording the arrival of the delay request message
Carve T4, record the delay request message sends out moment T3；
Receive the mixing OLT transmissions carries the arrival time T4Delay request feedback message, obtain and record described arrive
Up to moment T4, and moment T is sent out by the clock sync message1, the clock sync message arrival time T2, it is described
Delay request message sends out moment T3And the arrival time T of the delay request message4, clock adjustment information is calculated, is pressed
The clock adjustment information adjusts the clock of the network module.
6. according to the method described in claim 5, it is characterized in that, described send out moment T by the clock sync message1、
The arrival time T of the clock sync message2, the delay request message send out moment T3And the delay request message
Arrival time T4, clock adjustment information is calculated, including：
Pass through T2-T1The time deviation T between the network module and the mixing OLT is calculatedoffset；
Pass through following formula：
Tdelay=(T2-T1+T4-T3)/2
T’offset=(T2-T1-T4+T3)/2
Sync message propagation delay time T is calculateddelayTime between the modified network module and the mixing OLT is inclined
Poor T 'offset。
7. according to the method described in claim 5, it is characterized in that, being equipped with optical splitter, the mixing OLT in the RoF link
Using the optical splitter by the atomic clock synchronous transmission of signal of the simulation to the different network modules.
8. according to the method described in claim 5, it is characterized in that, the network module includes in mixing ONU, ONU-BS, BS
One or more.
9. a kind of clock synchronization apparatus, which is characterized in that be applied to the network that light-carried wireless RoF is merged with passive optical network PON
In mixing optical line terminal OLT comprising：
First transmission unit is used for network module tranmitting data register sync message, so that the network module records the clock
The arrival time T of sync message2；
Synchronous signal obtaining unit, the atomic clock for obtaining simulation while sending the clock sync message synchronize letter
Number；
Second transmission unit, for the atomic clock synchronizing signal of the simulation to be sent to the network mould by RoF link
Block, so that the network module extracts when sending out of the clock sync message by the atomic clock synchronizing signal of the simulation
Carve T1And it records；
First receiving unit, the delay request message sent for receiving the network module, described in the network module record
Delay request message sends out moment T3；
First recording unit, the arrival time T for recording the delay request message4；And
Feedback unit carries the arrival time T for being sent to the network module4Delay request feedback message so that institute
Network module is stated to obtain and record the arrival time T4, and moment T is sent out by the clock sync message1, the clock
The arrival time T of sync message2, the delay request message send out moment T3And it is described delay request message arrival when
Carve T4, clock adjustment information is calculated, the clock of the network module is adjusted by the clock adjustment information.
10. a kind of clock synchronization apparatus, which is characterized in that be applied to the network that light-carried wireless RoF is merged with passive optical network PON
In network module comprising：
Second receiving unit, the clock sync message sent for receiving mixing optical line terminal OLT；
Second recording unit, the arrival time T for recording the clock sync message2；
Third receiving unit obtains while sending the clock sync message for receiving the mixing OLT and passes through RoF
The atomic clock synchronizing signal for the simulation that link is sent；
Third recording unit, for extracting sending out for the clock sync message by the atomic clock synchronizing signal of the simulation
Moment T1And it records；
Third transmission unit, for sending delay request message to the mixing OLT, so as to prolong described in mixing OLT records
The arrival time T of slow request message4；
4th recording unit sends out moment T for recording the delay request message3；
4th receiving unit, the arrival time T for postponing request message with the transmission sent for receiving the mixing OLT4
Delay request feedback message；
5th recording unit, for obtaining and recording the arrival time T4；
Clock adjustment unit, for sending out moment T by the clock sync message1, the clock sync message arrival when
Carve T2, the delay request message send out moment T3And the arrival time T of the delay request message4, calculate clock tune
Whole information is adjusted the clock of the network module by the clock adjustment information.
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| JP6848921B2 (en) * | 2018-03-29 | 2021-03-24 | ブラザー工業株式会社 | Machine tools and position-fixing methods |
| CN109495169B (en) * | 2018-12-03 | 2021-06-29 | 中国人民解放军陆军工程大学 | Wide-range high-precision time delay measuring device and method for optical fiber link |
| CN110518964B (en) * | 2019-09-06 | 2021-06-08 | 中国电子科技集团公司第五十四研究所 | Satellite ground station high-precision time synchronization method based on radio over fiber network |
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Inventor after: Yang Hui Inventor after: Zhang Jie Inventor after: Zhao Yongli Inventor after: Yao Qiuyan Inventor after: Bai Wei Inventor before: Yang Hui Inventor before: Zhang Jie Inventor before: Zhao Yongli Inventor before: Yao Qiuyan Inventor before: Bai Wei |