CN103139809A - Clock synchronization method and device - Google Patents
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- CN103139809A CN103139809A CN2012100373050A CN201210037305A CN103139809A CN 103139809 A CN103139809 A CN 103139809A CN 2012100373050 A CN2012100373050 A CN 2012100373050A CN 201210037305 A CN201210037305 A CN 201210037305A CN 103139809 A CN103139809 A CN 103139809A
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Abstract
The invention discloses a clock synchronization method and a device, wherein the method and the device are applied to a micromicro base station (HeNB). The method and the device comprise that a standard base station is selected from adjacent base stations, a clock of the standard base station serves as a standard clock, a system clock is adjusted according to the standard clock; and clock precision level of the adjacent base stations are obtained, the signal strength and the path delay of time of the adjacent base stations are measured, weighing calculation is conducted on the path delay of time according to the signal strength and the clock precision levels of the adjacent base stations, and the system clock is adjusted according to the result of the weighing calculation. Due to the fact that two aspects of coarse adjustment and fine adjustment are conducted on the system clock, synchronization precision of the clocks of the micromicro base station is improved, descending and ascending interference between two adjacent micromicro base stations and between the micromicro base station and a macro station in the prior art is reduced, and accumulation of errors in the process of synchronization is reduced.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of clock synchronizing method and device.
Background technology
LTE (Long Term Evolution, Long Term Evolution) is the next-generation mobile communications standard of main flow in the world after 3G (Third Generation) Moblie, is at 3GPP (3
rdGeneration Partnership Project, third generation partner program) in tissue, the Long Term Evolution as 3G (Third Generation) Moblie is carried out feasibility study and standardized, LTE and strengthen the research of version LTE-Advanced and standardization has been subject to global operator and equipment vendor supports the most widely and participates in.The LTE system is with OFDM (Orthogonal Frequency Division Multiplexing, OFDM) and multiple-input and multiple-output (Multiple Input Multiple Output, MIMI) technology is the basis, and adopts in mobile communication system and the optimization packet data transmission comprehensively.
Correspondence time division duplex (Time division duplex, TDD) system is owing to carrying out signal transmitting and receiving in same frequency range, if the minizone does not keep synchronously the problem that more serious transmitting-receiving interferes with each other can occurring, as shown in Figure 1.Therefore, the TDD network design needs between the residential quarter to keep the precise synchronization on subframe border and be configured to identical up-downgoing proportioning in same TDD synchronization zone.
At present, no matter be TD-SCDMA (Time Division Synchronized Code Division Multiple Access, TD SDMA access) system or TD-LTE is (Time Division Long Term Evolution, the time-division Long Term Evolution) system all considers and global positioning system (Global Positioning System, the GPS) timing signal that is based on adopted is realized the time synchronized between different base station.
But along with the development of LTE technology and universal gradually, the LTE frequency spectrum is high, the weak shortcoming of signal penetration capacity also exposes gradually, simultaneously along with cell flow and the increase of number of users, adopt Microcell and indoor covering to become one of means of dealing with problems, thereby brought the development of femto base station (HeNB), because HeNB normally is deployed in indoor environment, on engineering, the GPS antenna feeder should not be installed, therefore can not receive well gps satellite signal.Therefore, under the TDD standard, HeNB how to keep and grand station between clock synchronous between (eNB) and HeNB, just become the key of network design success or not.
At present, remove outside the gps satellite method for synchronizing time, the method that solves the time synchronization problem of indoor HeNB has between Network Synchronization and base station the several methods such as air interface motor synchronizing.Wherein, the main thought of air interface motor synchronizing method is that the base station can obtain with the base station that in network, other have been synchronizeed synchronously to comprise two aspects: initial synchronous foundation and periodic synchronization mechanism.At the initial synchronisation establishment stage, suppose base station A with Absolute Time Synchronization, base station A just can become the synchronous timing base of other base stations acquisitions in the synchronization zone, the timing that the synchronizing signal of the behavior search base station A of other base station pseudo-terminal sides is adjusted is separately alignd with base station A, thereby obtains synchronization among base stations.For preventing clock drift, also need periodically to carry out the tracking of synchronizing signal, carry out and initially set up process like syncsort.
Yet, because HeNB generally is deployed in indoor, be subjected to Building Influence very large, wireless signal diffraction, reflection, refraction effect are general, often are in the edge that macro base station eNB covers simultaneously, add between HeNB often adjacent very near, therefore, each HeNB is larger to the actual signal path Time delay measurement deviation between the benchmark macro base station, therefore may cause occuring between adjacent base station HeNB serious uplink channel interference or serious dl interference, as shown in Figure 1.Simultaneously, the position that HeNB disposes is random, and in existing air interface synchronization process, HeNB might directly be synchronizeed with eNB, also might need multi-hop synchronously to synchronize with eNB or other HeNB with realization.For the multi-hop air interface synchronization, synchronous error can add up along with the increase of jumping figure.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of clock synchronizing method and device, can improve the clock synchronization accuracy of femto base station.
For solving the problems of the technologies described above, a kind of clock synchronizing method of the present invention is applied to comprise in femto base station (HeNB):
Choose Reference BTS from adjacent base station, with the clock of described Reference BTS as reference clock, according to described reference clock adjustment System clock;
Obtain the clock accuracy rank of adjacent base station, and measure signal strength signal intensity and the path delay of time of adjacent base station, to computing weighted the path delay of time, adjust described system clock according to the ranking operation result according to the signal strength signal intensity of described adjacent base station and clock accuracy rank.
Further,, comprising computing weighted the path delay of time according to the signal strength signal intensity of described adjacent base station and clock accuracy rank:
Adopt L=k
1* l
1+ k
2* l
2+ ... ..k
n* l
nTo computing weighted the path delay of time, wherein, L is the ranking operation result, l
1～l
nBe the path delay of time of each adjacent base station, k
1～k
nWeight coefficient for path delay of time of each adjacent base station of correspondence adopts k=α * T+ β * P to calculate k
1～k
n, wherein, T is the clock accuracy rank of adjacent base station, and P is the signal strength signal intensity of adjacent base station, and α and β are for adjusting coefficient.
Further, also comprise: the value of determining described α and β makes k uprising and become large with clock precision grade and signal strength signal intensity.
Further, according to ranking operation adjustment System clock as a result, comprising: with the described ranking operation result of described system clock readjustment.
Further, also comprise:
Keep Neighboring Cell List, comprise clock accuracy rank, signal strength signal intensity and the path delay of time of described adjacent base station in described Neighboring Cell List;
Periodically described Neighboring Cell List is upgraded, and periodically according to the signal strength signal intensity of the adjacent base station in described Neighboring Cell List and clock accuracy rank to computing weighted the path delay of time, adjust described system clock according to the ranking operation result.
Further, also comprise:
After adjusting described system clock according to the ranking operation result, set the clock accuracy rank of self, be saved in the webserver, and open transmitter and carry out work.
Further, a kind of clock synchronization apparatus comprises: clock coarse regulation unit, information acquisition unit and clock accurate adjustment whole unit, wherein:
Described clock coarse regulation unit is used for choosing Reference BTS from adjacent base station, with the clock of described Reference BTS as reference clock, according to described reference clock adjustment System clock;
Described information acquisition unit, for the clock accuracy rank of obtaining adjacent base station, and signal strength signal intensity and the path delay of time of measuring adjacent base station;
The whole unit of described clock accurate adjustment is used for according to the signal strength signal intensity of described adjacent base station and clock accuracy rank adjusting described system clock to computing weighted the path delay of time according to the ranking operation result.
Further, described clock accurate adjustment whole unit specifically is used for adopting L=k
1* l
1+ k
2* l
2+ ... ..k
n* l
nTo computing weighted the path delay of time, wherein, L is the ranking operation result, l
1～l
nBe the path delay of time of each adjacent base station, k
1～k
nWeight coefficient for path delay of time of each adjacent base station of correspondence adopts k=α * T+ β * P to calculate k
1～k
n, wherein, T is the clock accuracy rank of adjacent base station, and P is the signal strength signal intensity of adjacent base station, and α and β are for adjusting coefficient.
Further, the value of described α and β makes k uprising and become large with clock precision grade and signal strength signal intensity.
Further, described clock accurate adjustment whole unit, concrete being used for the described ranking operation result of described system clock readjustment.
In sum, the present invention is by to the coarse regulation of system clock and accurate adjustment whole two aspects, improve the clock synchronization accuracy of femto base station, reduced the adjacent femto base station and the up-downgoing between femto base station and grand station that exist in the prior art and disturbed, reduced error accumulation in synchronizing process.
Description of drawings
Fig. 1 is the schematic diagram of the asynchronous interference of TDD adjacent cell;
Fig. 2 is HeNB, the eNB of present embodiment and the deployment schematic diagram of subscriber equipment;
Fig. 3 is the flow chart of the clock synchronizing method of present embodiment;
Fig. 4 is the schematic diagram in judgement system clock source, base station in present embodiment;
Fig. 5 is the Organization Chart of the clock synchronization apparatus of present embodiment.
Embodiment
Figure 2 shows that the deployment schematic diagram of HeNB and subscriber equipment, wherein, the radius of eNB A institute coverage cell is larger, the radius of HeNB B～HeNB F institute coverage cell is less, chooses some typical scenes, wherein, HeNB E but has overlapping with HeNB C and HeNB D not in the covering radius of eNB A.HeNB C and HeNB D all are positioned at the covering radius of eNB A, and the covering radius of HeNB C and HeNB D is also overlapping.
The problem of disturbing for solving up-downgoing, and improve clock synchronization accuracy, as shown in Figure 3, the air interface clock synchronization method of present embodiment comprises:
Step 301: the clock accuracy rank of self, the row labels of going forward side by side are confirmed in the base station of having completed clock synchronous;
The base station of having completed clock synchronous can be saved in the webserver with the clock accuracy rank of self, in gateway (GW) server.
In the present embodiment, the base station (HeNB and eNB) of having completed clock synchronous needs to confirm the clock accuracy rank of self, when concrete confirmation, several different methods can be arranged, and in present embodiment, arranges 0 and is the full accuracy rank, and 1 takes second place, and the rest may be inferred.
As shown in Figure 4, completed the judgement system clock source, base station of clock synchronous, wherein, adopting the clock accuracy rank of the base station of satellite GPS synchronizing signal is 0; The clock accuracy rank of the base station of Adoption Network clock synchronous source 1588V2 is 1; Adopting the clock accuracy rank of the base station of one-level air interface synchronization is 2; The clock accuracy rank that adopts the base station of air interface synchronization reaching or above grade two is 3; Not synchronizeing and adopt the clock accuracy rank of the base station of inside of base station clock source with any external perimysium reference clock source is 4.The clock accuracy rank can be set according to actual.
Step 302: the synchronizing signal for the treatment of synchronising base station (HeNB) search adjacent base station, choose signal the most by force or the base station that searches at first as Reference BTS, set up synchronized relation, with the clock of Reference BTS as reference clock, adjust the system clock of self according to reference clock, complete clock slightly synchronous;
In present embodiment, be the search base station synchronizing signal after synchronous HeNB start, obtain synchronizing information, choose signal the most by force or the base station that searches at first as Reference BTS, the synchronizing information of Reference BTS is carried out CP computing obtain frequency departure information, adjust the system clock of self according to frequency departure information, and carry out the uplink/downlink frames proportioning, reach the thick synchronous purpose of clock.
Step 303: treat that synchronous HeNB and adjacent base station carry out interacting message, obtain adjacent base station information;
Adjacent base station information can be the information such as cell ID.
Step 304: treat that synchronous HeNB obtains the clock accuracy rank of adjacent base station according to adjacent base station information, and measure signal strength signal intensity and the path delay of time of adjacent base station;
Treat that synchronous HeNB can obtain from the GW server clock accuracy rank of adjacent base station.
Because the HeNB position does not often have rule, and there is no the GPS geography information, because having obtained reference clock, measure signal strength signal intensity and the chain-circuit time delay of adjacent base station and can comparatively fast complete this moment, but still need to adopt the emission mode of mourning in silence to disturb to avoid adjacent base station is produced.
Step 305: treat that synchronous HeNB will be according to the signal strength signal intensity of adjacent base station and clock accuracy rank to computing weighted the path delay of time;
In present embodiment, can also carry out normalized to the result after ranking operation.
Treat that synchronous HeNB is as follows to the formula of the processing that computes weighted the path delay of time from each adjacent base station:
L＝k
1×l
1+k
2×l
2+.....k
n×l
n
Wherein, l
1～l
nEach adjacent base station is to the path delay of time for the treatment of synchronous HeNB, k
1～k
nBe the weight coefficient in path delay of time of each adjacent base station of correspondence, n is the quantity of adjacent base station.
The value of weight coefficient k is relevant with signal strength signal intensity with the clock accuracy rank of adjacent base station, in present embodiment, determines that the clock accuracy rank is higher, and weight coefficient is larger, otherwise less; The signal strength signal intensity of determining adjacent base station is larger, and corresponding weight coefficient is also larger, otherwise less.
The computational methods of determining weight coefficient k are: k=α * T+ β * P, wherein, T is the clock accuracy rank of adjacent base station, P is the signal strength signal intensity of adjacent base station, α and β are for adjusting coefficient, and adjusting coefficient can configure on the backstage, comes to select optimal value according to actual conditions, the value of α and β need to make k with the uprising and become large of clock precision grade and signal strength signal intensity, dies down and diminishes.
Step 306: treat that synchronous HeNB adjusts reference clock, the accurate adjustment of completion system clock according to the ranking operation result.
Treat that synchronous HeNB can adjust system clock forward above-mentioned ranking operation result.
After the accurate adjustment of synchronous HeNB completion system clock, can open transmitter and work normally.Treat that synchronous HeNB also needs to set the clock accuracy rank of self.
The accumulated error of bringing for the skew that prevents HeNB self clock, HeNB needs periodically to computing weighted the path delay of time, therefore, need to keep Neighboring Cell List, and periodically Neighboring Cell List is upgraded, clock accuracy rank, signal strength signal intensity and the path delay of time that need comprise adjacent base station in Neighboring Cell List, and periodically carry out the clock accurate adjustment according to Neighboring Cell List.
In present embodiment, adjust the system clock of self when a base station after, by opening transmitter, make adjacent base station can receive the signal of this base station, with signal strength signal intensity and the path delay of time of measuring this base station, adjacent base station also should join this base station in the Neighboring Cell List of self.If the system clock of adjacent base station is also from air interface synchronization, also can adopt same method and adjust the system clock of self, until network equalize, if the system clock of adjacent base station from gps signal or network 1588 synchronizing signals, does not need to adjust again.
As shown in Figure 5, present embodiment also provides a kind of clock synchronization apparatus, comprising: clock coarse regulation unit, information acquisition unit and clock accurate adjustment whole unit, wherein:
Clock coarse regulation unit is used for choosing Reference BTS from adjacent base station, and the clock of described Reference BTS as reference clock, is adjusted the system clock of self according to described reference clock;
Information acquisition unit, for the clock accuracy rank of obtaining adjacent base station, and signal strength signal intensity and the path delay of time of measuring adjacent base station;
The whole unit of clock accurate adjustment is used for according to the signal strength signal intensity of described adjacent base station and clock accuracy rank adjusting described system clock to computing weighted the path delay of time according to the ranking operation result.
The whole unit of described clock accurate adjustment, the concrete employing L=k that is used for
1* l
1+ k
2* l
2+ ... ..k
n* l
nTo computing weighted the path delay of time, wherein, L is the ranking operation result, l
1～l
nBe the path delay of time of each adjacent base station, k
1～k
nWeight coefficient for path delay of time of each adjacent base station of correspondence adopts k=α * T+ β * P to calculate k
1～k
n, wherein, T is the clock accuracy rank of adjacent base station, and P is the signal strength signal intensity of adjacent base station, and α and β are for adjusting coefficient.The value of α and β makes k uprising and become large with clock precision grade and signal strength signal intensity.
The whole unit of clock accurate adjustment, concrete being used for the described ranking operation result of described system clock readjustment.
obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step being made into the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a clock synchronizing method, is characterized in that, is applied to comprise in femto base station (HeNB):
Choose Reference BTS from adjacent base station, with the clock of described Reference BTS as reference clock, according to described reference clock adjustment System clock;
Obtain the clock accuracy rank of adjacent base station, and measure signal strength signal intensity and the path delay of time of adjacent base station, to computing weighted the path delay of time, adjust described system clock according to the ranking operation result according to the signal strength signal intensity of described adjacent base station and clock accuracy rank.
2. the method for claim 1, is characterized in that,, comprising computing weighted the path delay of time according to the signal strength signal intensity of described adjacent base station and clock accuracy rank:
Adopt L=k
1* l
1+ k
2* l
2+ ... ..k
n* l
nTo computing weighted the path delay of time, wherein, L is the ranking operation result, l
1～l
nBe the path delay of time of each adjacent base station, k
1～k
nWeight coefficient for path delay of time of each adjacent base station of correspondence adopts k=α * T+ β * P to calculate k
1～k
n, wherein, T is the clock accuracy rank of adjacent base station, and P is the signal strength signal intensity of adjacent base station, and α and β are for adjusting coefficient.
3. method as claimed in claim 2, is characterized in that, also comprises: the value of determining described α and β makes k uprising and become large with clock precision grade and signal strength signal intensity.
4. the method for claim 1, is characterized in that, according to ranking operation adjustment System clock as a result, comprising: with the described ranking operation result of described system clock readjustment.
5. the method for claim 1, is characterized in that, also comprises:
Keep Neighboring Cell List, comprise clock accuracy rank, signal strength signal intensity and the path delay of time of described adjacent base station in described Neighboring Cell List;
Periodically described Neighboring Cell List is upgraded, and periodically according to the signal strength signal intensity of the adjacent base station in described Neighboring Cell List and clock accuracy rank to computing weighted the path delay of time, adjust described system clock according to the ranking operation result.
6. the method for claim 1, is characterized in that, also comprises:
After adjusting described system clock according to the ranking operation result, set the clock accuracy rank of self, be saved in the webserver, and open transmitter and carry out work.
7. a clock synchronization apparatus, is characterized in that, comprising: clock coarse regulation unit, information acquisition unit and clock accurate adjustment whole unit, wherein:
Described clock coarse regulation unit is used for choosing Reference BTS from adjacent base station, with the clock of described Reference BTS as reference clock, according to described reference clock adjustment System clock;
Described information acquisition unit, for the clock accuracy rank of obtaining adjacent base station, and signal strength signal intensity and the path delay of time of measuring adjacent base station;
The whole unit of described clock accurate adjustment is used for according to the signal strength signal intensity of described adjacent base station and clock accuracy rank adjusting described system clock to computing weighted the path delay of time according to the ranking operation result.
8. device as claimed in claim 7 is characterized in that:
The whole unit of described clock accurate adjustment, the concrete employing L=k that is used for
1* l
1+ k
2* l
2+ ... ..k
n* l
nTo computing weighted the path delay of time, wherein, L is the ranking operation result, l
1～l
nBe the path delay of time of each adjacent base station, k
1～k
nWeight coefficient for path delay of time of each adjacent base station of correspondence adopts k=α * T+ β * P to calculate k
1～k
n, wherein, T is the clock accuracy rank of adjacent base station, and P is the signal strength signal intensity of adjacent base station, and α and β are for adjusting coefficient.
9. device as claimed in claim 8 is characterized in that: the value of described α and β makes k uprising and become large with clock precision grade and signal strength signal intensity.
10. device as claimed in claim 7 is characterized in that:
The whole unit of described clock accurate adjustment, concrete being used for the described ranking operation result of described system clock readjustment.
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|---|---|---|---|
| CN201210037305.0A CN103139809B (en) | 2011-12-02 | 2012-02-17 | A kind of clock synchronizing method and device |
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|---|---|---|---|
| CN2011103961026 | 2011-12-02 | ||
| CN201110396102.6 | 2011-12-02 | ||
| CN201110396102 | 2011-12-02 | ||
| CN201210037305.0A CN103139809B (en) | 2011-12-02 | 2012-02-17 | A kind of clock synchronizing method and device |
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| CN103139809A true CN103139809A (en) | 2013-06-05 |
| CN103139809B CN103139809B (en) | 2015-09-16 |
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| CN104411007A (en) * | 2014-09-29 | 2015-03-11 | 京信通信系统（中国）有限公司 | Base station air interface synchronization calibration method and device |
| WO2015109737A1 (en) * | 2014-01-27 | 2015-07-30 | 中兴通讯股份有限公司 | Method and system for determining delay difference, base station and user equipment |
| WO2015117278A1 (en) * | 2014-02-10 | 2015-08-13 | 华为技术有限公司 | Method for obtaining clock interruption signal, and nfv functional entity |
| CN105472725A (en) * | 2016-02-06 | 2016-04-06 | 北京佰才邦技术有限公司 | Base station synchronization method and device |
| WO2016065642A1 (en) * | 2014-10-31 | 2016-05-06 | 华为技术有限公司 | Synchronization device and method |
| CN111815964A (en) * | 2020-09-02 | 2020-10-23 | 四川九通智路科技有限公司 | Traffic flow detection system and method based on geomagnetic sensing type spike |
| CN113810988A (en) * | 2020-06-16 | 2021-12-17 | 上海华为技术有限公司 | Data processing method and related equipment |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015109737A1 (en) * | 2014-01-27 | 2015-07-30 | 中兴通讯股份有限公司 | Method and system for determining delay difference, base station and user equipment |
| US9730175B2 (en) | 2014-01-27 | 2017-08-08 | Zte Corporation | Method and system for determining delay difference, base station and user equipment |
| WO2015117278A1 (en) * | 2014-02-10 | 2015-08-13 | 华为技术有限公司 | Method for obtaining clock interruption signal, and nfv functional entity |
| CN105103125A (en) * | 2014-02-10 | 2015-11-25 | 华为技术有限公司 | Method for obtaining clock interruption signal, and nfv functional entity |
| CN105103125B (en) * | 2014-02-10 | 2017-12-05 | 华为技术有限公司 | The acquisition methods and NFV devices of clock interrupt signal |
| CN104411007A (en) * | 2014-09-29 | 2015-03-11 | 京信通信系统（中国）有限公司 | Base station air interface synchronization calibration method and device |
| CN104411007B (en) * | 2014-09-29 | 2018-01-09 | 京信通信系统（中国）有限公司 | Base station air interface synchronization calibration method and device |
| CN105960820B (en) * | 2014-10-31 | 2019-05-24 | 华为技术有限公司 | A kind of synchronizing device and method |
| WO2016065642A1 (en) * | 2014-10-31 | 2016-05-06 | 华为技术有限公司 | Synchronization device and method |
| CN105960820A (en) * | 2014-10-31 | 2016-09-21 | 华为技术有限公司 | Synchronization device and method |
| CN105472725A (en) * | 2016-02-06 | 2016-04-06 | 北京佰才邦技术有限公司 | Base station synchronization method and device |
| CN113810988A (en) * | 2020-06-16 | 2021-12-17 | 上海华为技术有限公司 | Data processing method and related equipment |
| WO2021253916A1 (en) * | 2020-06-16 | 2021-12-23 | 华为技术有限公司 | Data processing method and related device |
| CN113810988B (en) * | 2020-06-16 | 2023-03-10 | 上海华为技术有限公司 | Data processing method and related equipment |
| CN111815964A (en) * | 2020-09-02 | 2020-10-23 | 四川九通智路科技有限公司 | Traffic flow detection system and method based on geomagnetic sensing type spike |
| CN111815964B (en) * | 2020-09-02 | 2020-12-29 | 四川九通智路科技有限公司 | Traffic flow detection system and method based on geomagnetic sensing type spike |
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| Publication number | Publication date |
|---|---|
| CN103139809B (en) | 2015-09-16 |
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