CN102547970A - Method and device for keeping synchronization - Google Patents
Method and device for keeping synchronization Download PDFInfo
- Publication number
- CN102547970A CN102547970A CN2012100447660A CN201210044766A CN102547970A CN 102547970 A CN102547970 A CN 102547970A CN 2012100447660 A CN2012100447660 A CN 2012100447660A CN 201210044766 A CN201210044766 A CN 201210044766A CN 102547970 A CN102547970 A CN 102547970A
- Authority
- CN
- China
- Prior art keywords
- kinds
- synchronous control
- signal
- control signals
- multiple connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
The invention discloses a method and a device for keeping synchronization, which are used for implementing accurate synchronization among devices under the scene of long-distance transmission. The method comprises the following steps: a sending end performs multiplexing on at least two types of synchronization control signals between two devices with synchronization to be implemented at a long distance, and sends the obtained multiplexing signals to the receiving end through an optical fiber; the receiving end receives the multiplexing signals sent by the sending end through the optical fiber and performs demultiplexing, and acquires at least two types of synchronization control signals, and then the receiving end keeps synchronization with the sending end according to the at least two types of synchronization control signals. Thus, through sending the synchronization control signals after multiplexing through the optical fiber between the devices, the synchronization control signals can be prevented effectively from being attenuated, the transmission distance of the synchronization control signals is prolonged, and the synchronization control signals between the devices with long distances can also be transmitted accurately, thus the synchronization of the devices are realized accurately, and the system transmission performance is ensured.
Description
Technical field
The present invention relates to the communications field, particularly a kind ofly keep synchronous method and device.
Background technology
Under the prior art, in the communication system of TDD (Time division duplex, time division duplex) standard; Between base station and the base station in order to prevent mutual interference mutually; Need to keep strict synchronously, for ground system, using maximum at present is to adopt the satellite method of synchronization; Be base station bunch satellite lock unit of configuration of each base station or same website realize with other website base station synchronously, synchronization accuracy can reach the wonderful level of sub-micro.
But; For underground system (as shown in Figure 1) or large-scale indoor distributed system; Because the attenuation characteristic of analog high frequency in feeder line, transmission range is very limited, and therefore traditional satellite method of synchronization is restricted in these application scenarioss; Be difficult to satisfy the user demand of the application scenarios of apart from each others such as underground system (covering) and indoor distributed system like, mine.
Summary of the invention
The embodiment of the invention provides a kind of maintenance method for synchronous and device, in order under the long-distance transmissions scene between implement device accurately synchronously.
The concrete technical scheme that the embodiment of the invention provides is following:
A kind ofly keep synchronous method, comprising:
Transmitting terminal carries out multiple connection with at least two kinds of synchronous control signals;
Transmitting terminal is sent to receiving terminal with the multiplexed signal that obtains through optical fiber, makes receiving terminal keep synchronously according to multiplexed signal that receives and transmitting terminal.
A kind ofly keep synchronous method, comprising:
The multiplexed signal that receiving terminal transmits through the optical fiber receiving end/sending end,
Receiving terminal is separated multiple connection to said multiplexed signal, obtains at least two kinds of synchronous control signals, and keeps synchronously according to said at least two kinds of synchronous control signals and transmitting terminal.
A kind ofly keep synchronous device, comprising:
Processing unit is used at least two kinds of synchronous control signals are carried out multiple connection;
Communication unit is used for the multiplexed signal that obtains is sent to receiving terminal through optical fiber, makes receiving terminal keep synchronously according to multiplexed signal that receives and transmitting terminal.
A kind ofly keep synchronous device, comprising:
Communication unit is used for the multiplexed signal through the transmission of optical fiber receiving end/sending end,
Processing unit is used for said multiplexed signal is separated multiple connection, obtains at least two kinds of synchronous control signals, and keeps synchronously according to said at least two kinds of synchronous control signals and transmitting terminal.
In the embodiment of the invention; Between two devices of synchronous apart from each other to be achieved; Transmitting terminal carries out multiple connection with at least two kinds of synchronous control signals, and the multiplexed signal that obtains is mail to receiving terminal through optical fiber, and the multiplexed signal that receiving terminal transmits through the optical fiber receiving end/sending end and separate multiple connection; Obtain at least two kinds of synchronous control signals, keep synchronously according to these at least two kinds of synchronous control signals and transmitting terminal again.Like this; Pass through the synchronous control signal after optical fiber transmits multiple connection between device; Can avoid synchronous control signal decay to occur effectively, the transmission range that has prolonged synchronous control signal makes between the device of apart from each other also transmitting synchronous control signal like clockwork; Thereby realize accurately to each other synchronously, guaranteed the transmission performance of system.
Description of drawings
Fig. 1 is a synchronization scenarios exemplary plot under the prior art;
Fig. 2 sends distolateral synchronous flow journey figure in the embodiment of the invention;
Fig. 3 is a multiplexed signal structural representation in the embodiment of the invention;
Fig. 4 receives distolateral synchronous flow journey figure in the embodiment of the invention;
Fig. 5 is an apparatus function structural representation in the embodiment of the invention;
Fig. 6 is apparatus function topology example figure in the embodiment of the invention.
Embodiment
For the long-distance transmissions application scenarios (as, underground system, indoor heating system etc.) under, between the implement device accurately synchronously; In the embodiment of the invention, no longer keep synchronously between each device in the long-distance transmissions application scenarios, but adopt unified clock source based on satellite-signal; In subrange, keep synchronously; Be specially: transmitting terminal carries out multiple connection with at least two kinds of synchronous control signals, and the multiplexed signal that obtains is mail to receiving terminal through optical fiber, and the multiplexed signal that receiving terminal transmits through the optical fiber receiving end/sending end and separate multiple connection; Obtain at least two kinds of synchronous control signals, keep synchronously according to these at least two kinds of synchronous control signals and transmitting terminal again.
Be elaborated in the face of the preferred embodiment of the present invention down.
Based on the foregoing description, consult shown in Figure 2ly, in the embodiment of the invention, keep synchronous transmitting terminal flow process following between each device:
Step 200: transmitting terminal carries out multiple connection with at least two kinds of synchronous control signals.
In the embodiment of the invention; The synchronous control signal that transmitting terminal uses comprises a kind of or combination in any in the following signal: PP1S (Pulse Per 1S; 1 second commutator pulse) signal, TOD (Time of Day, temporal information) signal, state control signal and condition indicative signal.
The concrete implementation of step 200 is following:
A1, transmitting terminal are confirmed preset multiple connection clock.
In the present embodiment, the acting as of multiple connection clock: the synchronous control signal to the low speed of input is sampled, and the reference of the clock that uses when changing between the synchronous control signal of low speed and the serial data stream;
In A2, the duration scope of transmitting terminal, at least two kinds of synchronous control signals are sampled respectively based on above-mentioned multiple connection clock multiple connection clock indication.
Preferable, at least two kinds of Synchronization Control low speed that uses when transmitting terminal and multiple connection clock are during as synchronized relation, and these at least two kinds of the highest supporting rates of synchronous control signal are the multiple connection clock rate; And at least two kinds of synchronous control signals that use when transmitting terminal and multiple connection clock be during as asynchronous relationship, and these at least two kinds of the highest supporting rates of synchronous control signal are 1/5 of multiple connection clock rate.
A3, transmitting terminal are arranged in order each synchronous control signal corresponding sampling points according to setting in each frame of multiplexed signal in proper order.
For example, after PP1S signal, TOD signal, state control signal and the condition indicative signal of low speed sampled respectively, carry out multiple connection according to mode as shown in Figure 3, like this, just the synchronous control signal with a plurality of low speed is multiplexed to serial data stream at a high speed.
Step 210: transmitting terminal is sent to receiving terminal with the multiplexed signal that obtains through optical fiber, makes receiving terminal keep synchronously according to the multiplexed signal that receives and this transmitting terminal.
In the present embodiment, through the synchronous control signal after the optical fiber transmission multiple connection, can avoid synchronous control signal decay to occur effectively between device; Therefore; Even if wide apart between the device also can obtain synchronous control signal accurately, thus realize like clockwork to each other synchronously.
Further, based on the foregoing description, in order to improve the precision of synchronous control signal, transmitting terminal will carry out delay compensation to the synchronous control signal of wherein a kind of or combination in any at least two kinds of synchronous control signals the time before the row multiple connection, is specially:
B1, transmitting terminal carry out latency measurement based on the delay compensation reference signal.
In the present embodiment, the delay compensation reference signal that transmitting terminal uses can be the independently reference signal that is provided with in advance, any one in above-mentioned at least two kinds of synchronous control signals that also can be multiplexing.
On the other hand, in the practical application because transmitting terminal is when carrying out latency measurement, the measured value of acquisition is represented be between transmitting terminal and the receiving terminal two-way time corresponding time delay, be only final required measurement result after therefore measured value being removed 2.
B2, transmitting terminal carry out delay compensation according to measurement result respectively to a kind of or combination in any in above-mentioned two kinds of synchronous control signals.
Be that the time delay compensating operation promptly can independently be carried out to single synchronous control signal, also can carry out to a plurality of synchronous control signals are whole.
Corresponding with the foregoing description, consult shown in Figure 4ly, in the embodiment of the invention, keep synchronous receiving terminal flow process following between device:
Step 400: the multiplexed signal that receiving terminal transmits through the optical fiber receiving end/sending end.
Step 410: receiving terminal is separated multiple connection to the multiplexed signal that receives, and obtains at least two kinds of synchronous control signals, and keeps synchronously according to above-mentioned at least two kinds of synchronous control signals and transmitting terminal.
In the present embodiment; Receiving terminal is just through separating the synchronous control signal that multiple connection operation handlebar serial data stream at a high speed is reduced into a plurality of low speed; And the synchronous control signal that receiving terminal adopts when carrying out multiple connection through the synchronous control signal of separating multiple connection and obtaining with transmitting terminal is consistent on characteristic, i.e. the synchronous control signal of receiving terminal acquisition comprises a kind of or combination in any in PP1S signal, TOD signal, state control signal and the condition indicative signal.
Based on the foregoing description, to consult shown in Figure 5ly, in the embodiment of the invention, the device that is used to keep synchronous (like, base station) comprises communication unit 50 and processing unit 51, further, also is provided with time delay control unit 52, wherein,
As transmitting terminal the time,
Further, time delay control unit 52 is used for before 51 pairs of at least two kinds of synchronous control signals of processing unit carry out multiple connection, these at least two kinds of synchronous control signals being carried out delay compensation.
And during as receiving terminal,
The concrete logic realization mode of above-mentioned communication unit 50, processing unit 51 and time delay control unit 52 can be consulted shown in Figure 6.
In sum; In the embodiment of the invention, between two devices of synchronous apart from each other to be achieved, transmitting terminal carries out multiple connection with at least two kinds of synchronous control signals; And the multiplexed signal that obtains mail to receiving terminal through optical fiber; And the multiplexed signal that receiving terminal transmits through the optical fiber receiving end/sending end and separate multiple connection obtains at least two kinds of synchronous control signals, and is synchronous with the transmitting terminal maintenance according to these at least two kinds of synchronous control signals again.Like this; Pass through the synchronous control signal after optical fiber transmits multiple connection between device; Can avoid synchronous control signal decay to occur effectively, the transmission range that has prolonged synchronous control signal makes between the device of apart from each other also transmitting synchronous control signal like clockwork; Thereby realize accurately to each other synchronously, guaranteed the transmission performance of system.
In the practical application; The technical scheme that the embodiment of the invention provides; Can effectively solve the stationary problem of two or more synchronizers (like, base station) when apart from each other, also can effectively solve synchronisation source and the synchronizer synchronous transmission problem when apart from each other; Be not limited to a kind of application scenarios, repeat no more at this.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (18)
1. one kind keeps synchronous method, it is characterized in that, comprising:
Transmitting terminal carries out multiple connection with at least two kinds of synchronous control signals;
Transmitting terminal is sent to receiving terminal with the multiplexed signal that obtains through optical fiber, makes receiving terminal keep synchronously according to multiplexed signal that receives and transmitting terminal.
2. the method for claim 1 is characterized in that, said synchronous control signal comprises 1 second a kind of or combination in any in commutator pulse PP1S signal, temporal information TOD signal, state control signal and the condition indicative signal.
3. according to claim 1 or claim 2 method is characterized in that transmitting terminal carries out multiple connection with at least two kinds of synchronous control signals, comprising:
Transmitting terminal is confirmed preset multiple connection clock;
Transmitting terminal is sampled respectively to said two kinds of synchronous control signals based on said multiple connection clock at least;
Transmitting terminal is arranged in order each synchronous control signal corresponding sampling points according to setting in each frame of multiplexed signal in proper order.
4. method as claimed in claim 3 is characterized in that, said at least two kinds of Synchronization Control low speed that transmitting terminal uses and multiple connection clock are during as synchronized relation, and said at least two kinds of the highest supporting rates of synchronous control signal are the multiple connection clock rate;
Said at least two kinds of synchronous control signals that transmitting terminal uses and multiple connection clock are during as asynchronous relationship, and said at least two kinds of the highest supporting rates of synchronous control signal are 1/5 of multiple connection clock rate.
5. according to claim 1 or claim 2 method is characterized in that, transmitting terminal before the row multiple connection, carries out delay compensation to said at least two kinds of synchronous control signals during to said at least two kinds of synchronous control signals.
6. method as claimed in claim 5 is characterized in that, transmitting terminal carries out delay compensation to said at least two kinds of synchronous control signals, comprising:
Transmitting terminal carries out latency measurement based on the delay compensation reference signal;
Transmitting terminal carries out delay compensation according to measurement result respectively to a kind of or combination in any in said two kinds of synchronous control signals.
7. method as claimed in claim 6 is characterized in that, the delay compensation reference signal that said transmitting terminal adopts be the independently reference signal of setting in advance, perhaps, is in said at least two kinds of synchronous control signals any one.
8. one kind keeps synchronous method, it is characterized in that, comprising:
The multiplexed signal that receiving terminal transmits through the optical fiber receiving end/sending end,
Receiving terminal is separated multiple connection to said multiplexed signal, obtains at least two kinds of synchronous control signals, and keeps synchronously according to said at least two kinds of synchronous control signals and transmitting terminal.
9. method as claimed in claim 8 is characterized in that, said synchronous control signal comprises 1 second a kind of or combination in any in commutator pulse PP1S signal, temporal information TOD signal, state control signal and the condition indicative signal.
10. one kind keeps synchronous device, it is characterized in that, comprising:
Processing unit is used at least two kinds of synchronous control signals are carried out multiple connection;
Communication unit is used for the multiplexed signal that obtains is sent to receiving terminal through optical fiber, makes receiving terminal keep synchronously according to multiplexed signal that receives and transmitting terminal.
11. device as claimed in claim 10 is characterized in that, the synchronous control signal that said processing unit adopts comprises a kind of or combination in any in PP1S signal, TOD signal, state control signal and the condition indicative signal.
12. like claim 10 or 11 described devices; It is characterized in that, when said processing unit carries out multiple connection with at least two kinds of synchronous control signals, confirm preset multiple connection clock; And based on said multiple connection clock; Said at least two kinds of synchronous control signals are sampled respectively, and in each frame of multiplexed signal, each synchronous control signal corresponding sampling points is arranged in order according to setting in proper order.
13. device as claimed in claim 12 is characterized in that, said at least two kinds of Synchronization Control low speed that said processing unit uses and multiple connection clock are during as synchronized relation, and said at least two kinds of the highest supporting rates of synchronous control signal are the multiple connection clock rate; Said at least two kinds of synchronous control signals that said processing unit uses and multiple connection clock are during as asynchronous relationship, and said at least two kinds of the highest supporting rates of synchronous control signal are 1/5 of multiple connection clock rate.
14. like claim 10 or 11 described devices, it is characterized in that, further comprise:
Time delay control unit is used for during to said at least two kinds of synchronous control signals before the row multiple connection, said at least two kinds of synchronous control signals being carried out delay compensation at said processing unit.
15. device as claimed in claim 14; It is characterized in that; When said time delay control unit is carried out delay compensation to said at least two kinds of synchronous control signals; Transmitting terminal carries out latency measurement based on the delay compensation reference signal, and according to measurement result a kind of or combination in any in said two kinds of synchronous control signals is carried out delay compensation respectively.
16. device as claimed in claim 15 is characterized in that, the delay compensation reference signal that said delay compensation unit adopts be the independently reference signal of setting in advance, perhaps, is in said at least two kinds of synchronous control signals any one.
17. one kind keeps synchronous device, it is characterized in that, comprising:
Communication unit is used for the multiplexed signal through the transmission of optical fiber receiving end/sending end,
Processing unit is used for said multiplexed signal is separated multiple connection, obtains at least two kinds of synchronous control signals, and keeps synchronously according to said at least two kinds of synchronous control signals and transmitting terminal.
18. device as claimed in claim 17 is characterized in that, the synchronous control signal that said processing unit adopts comprises a kind of or combination in any in PP1S signal, TOD signal, state control signal and the condition indicative signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100447660A CN102547970A (en) | 2012-02-23 | 2012-02-23 | Method and device for keeping synchronization |
| PCT/CN2012/084764 WO2013123784A1 (en) | 2012-02-23 | 2012-11-16 | Method and device for maintaining synchronization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100447660A CN102547970A (en) | 2012-02-23 | 2012-02-23 | Method and device for keeping synchronization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102547970A true CN102547970A (en) | 2012-07-04 |
Family
ID=46353640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100447660A Pending CN102547970A (en) | 2012-02-23 | 2012-02-23 | Method and device for keeping synchronization |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102547970A (en) |
| WO (1) | WO2013123784A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013123784A1 (en) * | 2012-02-23 | 2013-08-29 | 大唐移动通信设备有限公司 | Method and device for maintaining synchronization |
| CN105281882A (en) * | 2014-06-30 | 2016-01-27 | 中兴通讯股份有限公司 | Method and device for realizing time synchronization |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1556593A (en) * | 2003-12-31 | 2004-12-22 | 中兴通讯股份有限公司 | Digital interface circuit in light synchronous digit transmission system and its data demultiplexing method |
| WO2009049511A1 (en) * | 2007-10-16 | 2009-04-23 | Shenzhen Grentech Co., Ltd | Data transmission synchro precision controlling method and system |
| CN101710849A (en) * | 2009-11-04 | 2010-05-19 | 中国电力科学研究院 | Single signal wire synchronous clock transfer method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463458C (en) * | 2005-07-08 | 2009-02-18 | 广州海格通信集团股份有限公司 | Method for implementing frequency hopping synchronization for orthogonal frequency division multiplex |
| CN102547970A (en) * | 2012-02-23 | 2012-07-04 | 大唐移动通信设备有限公司 | Method and device for keeping synchronization |
-
2012
- 2012-02-23 CN CN2012100447660A patent/CN102547970A/en active Pending
- 2012-11-16 WO PCT/CN2012/084764 patent/WO2013123784A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1556593A (en) * | 2003-12-31 | 2004-12-22 | 中兴通讯股份有限公司 | Digital interface circuit in light synchronous digit transmission system and its data demultiplexing method |
| WO2009049511A1 (en) * | 2007-10-16 | 2009-04-23 | Shenzhen Grentech Co., Ltd | Data transmission synchro precision controlling method and system |
| CN101710849A (en) * | 2009-11-04 | 2010-05-19 | 中国电力科学研究院 | Single signal wire synchronous clock transfer method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013123784A1 (en) * | 2012-02-23 | 2013-08-29 | 大唐移动通信设备有限公司 | Method and device for maintaining synchronization |
| CN105281882A (en) * | 2014-06-30 | 2016-01-27 | 中兴通讯股份有限公司 | Method and device for realizing time synchronization |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013123784A1 (en) | 2013-08-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101123465B (en) | Method and device for synchronization of network devices in wireless communication system | |
| CN101827098A (en) | Processing method and device for time synchronization | |
| CN102843620A (en) | OTN (Optical Transport Network) device and method for realizing time synchronous transmission | |
| CN102394715A (en) | Method and device for synchronizing clocks | |
| EP2515591B1 (en) | Method, apparatus and system for clock synchronization | |
| US9172525B2 (en) | Method and device for compensating for time path | |
| CN110233708B (en) | Data receiving and transmitting rate adjusting device and operation method thereof | |
| CN102932083A (en) | Microwave time synchronization method and device | |
| CN105634641B (en) | Based on architecture for exchanging can cascade network communication accurate timing system and method | |
| CN103906222B (en) | A kind of uplink data synchronous method, system and equipment | |
| EP3611851B1 (en) | Static delay compensation in a telecommunications system | |
| CN103152118B (en) | A kind of Base Band Unit and radio frequency unit data service synchronization, device and system | |
| CN106341879A (en) | GPS time reference-based multi-point synchronous communication method and device | |
| CN106604383B (en) | Time synchronization method, master time synchronization device and communication system | |
| EP1699148B1 (en) | Synchronous data transmission between plural remote radio devices and a base-band processing device of a W-CDMA base station | |
| CN106788840B (en) | A kind of high-precision optical fiber method for synchronizing time based on optical fiber Frequency Transfer | |
| CN106688207A (en) | Method for determining a propagation time of a telegram in a communication network, and corresponding network components | |
| CN108551378B (en) | A kind of radiofrequency signal remote transmission method | |
| CN108234056A (en) | Using the single fiber bi-directional time delivering method and system of co-wavelength half-duplex mode | |
| US20160365920A1 (en) | Optical transmission system and delay measurement method | |
| CN102547970A (en) | Method and device for keeping synchronization | |
| CN208971520U (en) | A kind of measuring system of transmission fiber delay | |
| CN103078728B (en) | Clock synchronization system | |
| CN103199950A (en) | Method for carrying out high-accuracy time transfer by utilizing E1 special line | |
| EP0720319A2 (en) | Clock recovery extrapolation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120704 |