CN1946002B - Clock synchronizing method between base stations - Google Patents
Clock synchronizing method between base stations Download PDFInfo
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- CN1946002B CN1946002B CN2006100630228A CN200610063022A CN1946002B CN 1946002 B CN1946002 B CN 1946002B CN 2006100630228 A CN2006100630228 A CN 2006100630228A CN 200610063022 A CN200610063022 A CN 200610063022A CN 1946002 B CN1946002 B CN 1946002B
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Abstract
This invention discloses a clock synchronization method among base stations, which sets a time server in the entire network to broadcast primary time information to all base stations in the network in definite time to adjust their local clocks periodically to synchronize with the primary clock so as to guarantee synchronization of clocks among base stations. Besides, the base stations can use clocks of low stability as the system clocks and not needing calibration periodically to reduce the maintenance cost.
Description
Technical field
The present invention relates to field of mobile communication, relate in particular to the Clock Synchronization Technology between the base station.
Background technology
In wireless telecommunication system such as WCDMA, CDMA2000, GSM, can normally switch between the base station in order to guarantee mobile phone, need the clock of each base station can keep to a certain extent synchronously.In order to reach this purpose, generally adopt phase-locked/frequency technology at present in the base station, the implementation of this class technology mainly comprises three parts, i.e. clock source, phase-locked/frequency loop and oscillator.Be illustrated in figure 1 as the signal schematic diagram of phase-locked/frequency system, control unit is by relatively exporting the x phase place or the frequency of clock and reference clock, calculate the error of determining between output clock and the reference clock, and according to this error regulate, control generator, thereby realize output clock and the synchronous purpose of reference clock.Generally there are recovered clock, gps clock, high stability clock such as BTS system clock, the metastable clock etc. of transmission link in the clock source of wherein being adopted.As adopt the clock of high stability, and be set in when dispatching from the factory on the design frequency, in the whole life of product, the frequency stability of such clock can satisfy the needs of base station operate as normal, but its cost is relatively very high; If use low stability clock, in a period of time, the stability of its frequency can satisfy the needs of base station operate as normal, but in the life cycle of product, needs regularly to adjust this clock of calibration, just can guarantee the operate as normal of base station.Such clock is owing to needing periodic calibration, so its maintenance cost is higher.
In addition, along with the development of IP transmission, base station system also progressively begins to support the IP transmission.But do not comprise reference clock information in the IP transmission link, the reference clock information of base station in can't transmission link, under GPS and other clock sources were subjected to situation that the infield restriction is difficult to obtain, the clock synchronization between the base station will be difficult to realize.
Summary of the invention
The purpose of this invention is to provide the clock synchronizing method between a kind of base station, to realize the clock synchronization in the IP transmission.
For achieving the above object, the present invention is by the following technical solutions:
Clock synchronizing method between a kind of base station in order to realize the clock synchronization in the IP transmission, is provided with a time server in network, this method specifically may further comprise the steps:
Reference clock information is reported in step 1, described time server all base stations in network;
Wherein, time server is specially to base station report reference clock information in the described step 1: time server periodically sends the message that has reference clock information to each base station.
Perhaps, time server is specially to base station report reference clock information in the described step 1: described time server is all base station broadcast reference clock in network regularly.
Wherein, described time server is specially to the step of base station broadcast reference clock:
A, described clock server are every time interval δ T all serialized data message of base station broadcast in network just;
B, base station receiving data packets write down the corresponding sequence number of described data message and add up the timing local clock.
Affiliated step B specifically comprises:
After B1, the base station initiated work, when receiving first data message, write down current sequence number of message, start the local clock timer simultaneously and carry out the timing statistics;
B2, base station are when receiving N data message, and the timing statistics that timing rises according to local clock obtains local clock T ';
Described step 2 specifically comprises:
Deviation between C1, calculation base station local clock and the reference clock;
C2, adjust local clock according to the deviation between described local clock and the reference clock.
Described step C1 is specially: according to formula
Calculate the relative error Δ between local clock and reference clock,
Wherein, Δ is the relative error between local clock and the reference clock, and δ T is the time interval, and N is the number of the data message that receives in time interval δ T of base station, and T ' is the base station local clock.
Adjustment local clock among the described step C2 is specially: adjust base station local clock frequency according to the relative error Δ between described local clock and reference clock, make base station local clock and reference clock synchronous.
Described time server can also can be a node existing in the network for a server independently.
By technique scheme as can be seen, in terms of existing technologies, the present invention is by being provided with time server regularly to each base station report reference clock information in whole network, local clock is regularly adjusted according to this reference clock information in each base station, base station local clock and reference clock are kept synchronously, thereby realize the clock synchronization between the base station in the IP transmission.In addition, when using the IP transmission, use the present invention, the base station can also use the relatively low clock of stability as the local system clock, and does not need periodic calibration, thereby can save the cost of base station, reduces the system maintenance cost simultaneously.
Description of drawings
Figure 1 shows that existing phase-locked/scheme principle schematic frequently;
Fig. 2 is according to clock synchronizing method flow chart between the base station of the embodiment of the invention.
Embodiment
The core concept of the inventive method is: under the situation of using the IP transmission, by in whole wireless network, setting up time server, by this time server timing all base stations report reference clock information in network, the base station local clock is regularly adjusted according to the reference clock information that receives in the base station, thereby base station local clock and reference clock are kept synchronously.
For making the purpose, technical solutions and advantages of the present invention clearer, be convenient to persons skilled in the art understanding and realize the present invention, below in conjunction with drawings and the specific embodiments the present invention is described in further detail.
As shown in Figure 2, clock synchronizing method detailed process according to an embodiment of the present invention:
1, in whole network, time server is set, provides reference clock information with all base stations in network.
Under the situation of using IP to transmit, can know reference clock information in order to make in the network each base station, can a time server be set in whole network at first, be used to each base station in the network that clock reference information is provided.Wherein said time server can be each node that exists in the existing network, also can be other one server independently, and can only establish a clock server on a local network.
2, reference clock is reported in described time server timing all base stations in network.
Described time server periodically provides the IP bag that has reference clock information with Fixed Time Interval to the base station, provides reference clock information to the base station, its concrete grammar can for:
Described time server is by the mode of broadcasting, regularly to all base station broadcast reference clocks.
Particularly, described time server is every the Fixed Time Interval δ T IP bag of the base station broadcast of all in network one serialized data message just, to each base station broadcast reference clock information.Wherein, the sequence number of described data message can be interrupted counting to get by the timing that local clock is produced by time server.
Time interval δ T wherein can synchronised clock performance as required determine that described synchronised clock performance can be the stability of clock, that is to say the difference between actual frequency and the reference frequency, and general available relative error represents that unit is ppm.
Insert if be used for the UE of low speed, promptly the UE translational speed is slower, and the base station just can allow relatively large frequency error, such as 0.1ppm; If the UE translational speed is very fast, then just need clock more accurately, also promptly need less relatively frequency error, such as 0.05ppm.
For example: the clock jitter 0.1ppm of 10MHz has been exactly deviation 1Hz.Just can reach performance index if send timing information with time interval δ T1.If reach 0.05ppm, just 0.5Hz then just need send timing information with the time interval shorter than δ T1.The base station receives the data message that comes from time server, writes down the corresponding sequence number of described data message and adds up the timing local clock.Particularly, after the base station initiated work, when receiving first data message, the sequence number of record current data message starts simultaneously that the local clock timer is added up, timing;
The base station obtains base station local clock T ' according to the local clock clocking value after receiving N data message, can suspend local clock timer timing statistics simultaneously;
In addition, finish this timing statistics after, can start the local clock counter once more, carry out timing, statistics again.
Need to prove, described time server is to the mode of each base station report reference clock, be not limited only to above-mentioned form by broadcasting data messages, can also pass through other similar modes, such as by sending the message that carries reference clock information etc. to each base station respectively, to each base station report reference clock information.
3, local clock is regularly adjusted according to the reference clock information that time server provides in the base station, makes it to keep synchronously with reference clock.
Concrete steps can be described below:
At first, according to described reference clock information and base station local clock, the deviation between calculation base station local clock and the reference clock:
Particularly, such as mode at the broadcasting data messages of describing in above-mentioned 2, can the base station receives in one-period from the number N of the data message of time server and the clocking value T ' of local clock by comparison, calculate the difference between local clock and the reference clock, promptly according to formula
Calculate local clock and reference clock relative error Δ between the two.
Secondly, adjust the base station local clock according to the difference of described base station local clock and reference clock.Such as according to the relative error Δ between described local clock and the reference clock, by adjusting the clock frequency of base station local clock, the frequency error of local clock and reference clock is controlled in certain scope, to realize the synchronous of base station local clock and reference clock.
In the above concrete scheme of the present invention, the base station can adopt the relatively low clock of stability as local clock, and does not need periodic calibration.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (6)
1. the clock synchronizing method between the base station in order to realize the clock synchronization in the IP transmission, is characterized in that a time server is set, and this method specifically may further comprise the steps in network:
Reference clock information is reported in step 1, described time server all base stations in network;
Step 2, local clock is adjusted according to the reference clock information of described time server report in the base station, makes it to keep synchronously with reference clock;
Wherein, described time server is specially to base station report reference clock information:
A, described time server are every time interval δ T all serialized data message of base station broadcast in network just;
B, base station receiving data packets write down the corresponding sequence number of described data message and add up the timing local clock.
2. the clock synchronizing method between the base station according to claim 1 is characterized in that described step B specifically comprises:
After B1, the base station initiated work, when receiving first data message, write down current sequence number of message, start the local clock timer simultaneously and carry out the timing statistics;
B2, base station are when receiving N data message, and the timing statistics according to the local clock timer obtains local clock T '.
3. according to the clock synchronizing method between claim 1 or the 2 described base stations, it is characterized in that described step 2 specifically comprises:
Deviation between C1, calculation base station local clock and the reference clock;
C2, adjust local clock according to the deviation between described local clock and the reference clock.
4. according to the clock synchronizing method between the described base station of claim 3, it is characterized in that described step C1 is specially: according to formula
Calculate the relative error Δ between local clock and reference clock,
Wherein, Δ is the relative error between local clock and the reference clock, and δ T is the time interval, and N is the number of the data message that receives in time interval δ T of base station, and T ' is the base station local clock.
5. according to the clock synchronizing method between the described base station of claim 4, it is characterized in that: the adjustment local clock among the described step C2 is specially: adjust base station local clock frequency according to the relative error Δ between described local clock and reference clock, make local clock and reference clock synchronous.
6. according to clock synchronizing method between the described base station of claim 1, it is characterized in that: described time server can also can be a node existing in the network for a server independently.
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| CN2006100630228A CN1946002B (en) | 2006-09-30 | 2006-09-30 | Clock synchronizing method between base stations |
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| CN2006100630228A CN1946002B (en) | 2006-09-30 | 2006-09-30 | Clock synchronizing method between base stations |
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| CN1946002A CN1946002A (en) | 2007-04-11 |
| CN1946002B true CN1946002B (en) | 2010-10-06 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119155B (en) * | 2007-09-21 | 2011-02-09 | 深圳市虹远通信有限责任公司 | Synchronous clock calibrating method of TD-SCDMA repeater |
| CN101771528B (en) * | 2008-12-31 | 2013-08-07 | 华为技术有限公司 | Method, device and system for realizing clock synchronization |
| US8401007B2 (en) * | 2009-04-06 | 2013-03-19 | Avaya Inc. | Network synchronization over IP networks |
| CN103309228B (en) * | 2013-06-21 | 2017-08-25 | 厦门雅迅网络股份有限公司 | The time-correcting method of vehicle-mounted terminal system |
| CN105634639B (en) * | 2015-12-25 | 2018-05-08 | 小米科技有限责任公司 | Clock synchronizing method and device |
| CN106572528B (en) * | 2016-10-19 | 2020-03-03 | 武汉虹信通信技术有限责任公司 | Clock synchronization method and device |
| CN109699068B (en) * | 2017-10-20 | 2021-05-28 | 阿里巴巴集团控股有限公司 | Base station synchronization method and device |
| CN114245455B (en) * | 2022-01-06 | 2023-04-07 | 吉林大学 | Wireless positioning time synchronization method based on LoRa technology |
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| CN1466394A (en) * | 2002-06-10 | 2004-01-07 | 华为技术有限公司 | Method for realizing synchronization between base stations in mobile communication system |
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| CN1466394A (en) * | 2002-06-10 | 2004-01-07 | 华为技术有限公司 | Method for realizing synchronization between base stations in mobile communication system |
| CN1505279A (en) * | 2002-12-02 | 2004-06-16 | ��ʽ����Ntt����Ħ | Radio access network system, radio communication method, synchronous server and node |
| CN1812289A (en) * | 2005-01-26 | 2006-08-02 | 中兴通讯股份有限公司 | Apparatus for realizing network synchronization in personal cell phone based on IP |
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