CN103139809B - A kind of clock synchronizing method and device - Google Patents
A kind of clock synchronizing method and device Download PDFInfo
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- CN103139809B CN103139809B CN201210037305.0A CN201210037305A CN103139809B CN 103139809 B CN103139809 B CN 103139809B CN 201210037305 A CN201210037305 A CN 201210037305A CN 103139809 B CN103139809 B CN 103139809B
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Abstract
The invention discloses a kind of clock synchronizing method and device, be applied in femto base station (HeNB), comprise: from adjacent base station, choose Reference BTS, using 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, according to the signal strength signal intensity of described adjacent base station and clock accuracy rank, the path delay of time is computed weighted, adjust described system clock according to ranking operation result.The present invention is by the coarse regulation of system clock and whole two aspects of accurate adjustment, improve the clock synchronization accuracy of femto base station, reduce the adjacent femto base station that exists in prior art and the interference of the up-downgoing between femto base station and macro station, reduce synchronizing process medial error and add up.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate 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) carry out feasibility study and standardized as the Long Term Evolution of 3G (Third Generation) Moblie in tissue, LTE and strengthen the research of version LTE-Advanced and standardization receives global operator and equipment vendor supports the most widely and participates in.LTE system is with OFDM (Orthogonal Frequency Division Multiplexing, and multiple-input and multiple-output (Multiple Input Multiple Output OFDM), MIMI) based on technology, and adopt in mobile communication system comprehensively and optimize packet data transmission.
Corresponding time division duplex (Time division duplex, TDD) system, owing to carrying out signal transmitting and receiving in same frequency range, if minizone does not keep synchronous, then there will be the problem that more serious transmitting-receiving interferes with each other, as shown in Figure 1.Therefore, TDD network design needs to keep the precise synchronization of sub-frame boundary between community and be configured to identical up-downgoing proportioning in same TDD synchronization zone.
At present, no matter be TD-SCDMA (Time Division Synchronized Code DivisionMultiple Access, Time division multiple access) system or TD-LTE is (Time DivisionLong Term Evolution, time-division Long Term Evolution) system is all considered and what adopt is the time synchronized realizing between different base station based on global positioning system (Global Positioning System, GPS) timing signal.
But along with LTE technology development and popularize gradually, 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 in-door covering to become one of means of dealing with problems, thus bring the development of femto base station (HeNB), because HeNB is normally deployed in indoor environment, engineering should not install GPS antenna feeder, therefore can not receive gps satellite signal well.Therefore, under TDD standard, how HeNB keeps and clock synchronous between macro station between (eNB) and HeNB, just becomes the key of network design success or not.
At present, remove outside gps satellite method for synchronizing time, the method solving the time synchronization problem of indoor HeNB to have 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 base station can obtain synchronously with other synchronous base stations in network, comprises two aspects: initial synchronous foundation and periodically synchronously keep mechanism.At initial synchronisation establishment stage, suppose base station A with Absolute Time Synchronization, base station A just can become other base stations in synchronization zone and obtain synchronous timing base, the synchronizing signal of the behavior search base station A of other pseudo-terminal sides, base station adjusts respective timing and aligns with base station A, thus obtains synchronization among base stations.For preventing clock drift, also needing the tracking periodically carrying out synchronizing signal, performing and initially setting up process like syncsort.
But, because HeNB is generally deployed in indoor, very large by effect on building, wireless signal diffraction, reflection, refraction effect generally, are often in the edge that macro base station eNB covers simultaneously, add between HeNB often adjacent very near, therefore, actual signal path Time delay measurement deviation between each HeNB to benchmark macro base station is comparatively large, therefore may cause, between adjacent base station HeNB, serious uplink channel interference or serious dl interference occur, as shown in Figure 1.Meanwhile, the position that HeNB disposes is random, and in existing air interface synchronization process, HeNB is likely directly synchronous with eNB, also likely needs multi-hop synchronously synchronous with eNB or other HeNB to realize.For 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 in femto base station (HeNB), comprises:
Reference BTS is chosen, using the clock of described Reference BTS as reference clock, according to described reference clock adjustment System clock from adjacent base station;
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, according to the signal strength signal intensity of described adjacent base station and clock accuracy rank, the path delay of time is computed weighted, adjust described system clock according to ranking operation result.
Further, according to the signal strength signal intensity of described adjacent base station and clock accuracy rank, the path delay of time is computed weighted, comprising:
Adopt L=k
1× l
1+ k
2× l
2+ ... ..k
n× l
ncompute weighted to the path delay of time, wherein, L is ranking operation result, l
1~ l
nfor the path delay of time of each adjacent base station, k
1~ k
nfor the weight coefficient in the path delay of time of each adjacent base station of correspondence, k=α * T+ β * P is adopted 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, α and β is regulation coefficient.
Further, also comprise: determine that the value of described α and β makes k uprising and become large with clock precision grade and signal strength signal intensity.
Further, according to ranking operation result adjustment System clock, comprising: described system clock is adjusted back described ranking operation result.
Further, also comprise:
Maintain Neighboring Cell List, in described Neighboring Cell List, comprise the clock accuracy rank of described adjacent base station, signal strength signal intensity and the path delay of time;
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, the path delay of time is computed weighted, adjust described system clock according to ranking operation result.
Further, also comprise:
After adjusting described system clock according to 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, comprising: clock coarse regulation unit, information acquisition unit and clock essence adjustment unit, wherein:
Described clock coarse regulation unit, for choosing Reference BTS from adjacent base station, using the clock of described Reference BTS as reference clock, according to described reference clock adjustment System clock;
Described information acquisition unit, for obtaining the clock accuracy rank of adjacent base station, and measures signal strength signal intensity and the path delay of time of adjacent base station;
Described clock essence adjustment unit, for computing weighted to the path delay of time according to the signal strength signal intensity of described adjacent base station and clock accuracy rank, adjusts described system clock according to ranking operation result.
Further, described clock essence adjustment unit, specifically for adopting L=k
1× l
1+ k
2× l
2+ ... ..k
n× l
ncompute weighted to the path delay of time, wherein, L is ranking operation result, l
1~ l
nfor the path delay of time of each adjacent base station, k
1~ k
nfor the weight coefficient in the path delay of time of each adjacent base station of correspondence, k=α * T+ β * P is adopted 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, α and β is regulation 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 essence adjustment unit, specifically for adjusting back described ranking operation result by described system clock.
In sum, the present invention is by the coarse regulation of system clock and whole two aspects of accurate adjustment, improve the clock synchronization accuracy of femto base station, reduce the adjacent femto base station that exists in prior art and the interference of the up-downgoing between femto base station and macro station, reduce synchronizing process medial error and add up.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the asynchronous interference of TDD adjacent cell;
Fig. 2 is HeNB, 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 that in present embodiment, base station judges the schematic diagram that system clock is originated;
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 not in the covering radius of eNB A, but has overlapping with HeNB C and HeNB D.HeNB C and HeNB D is all positioned at the covering radius of eNB A, and the covering radius of HeNB C and HeNB D is also overlapping.
For solving the problem of up-downgoing interference, and improve clock synchronization accuracy, as shown in Figure 3, the air interface clock synchronization method of present embodiment, comprising:
Step 301: the base station having completed clock synchronous confirms the clock accuracy rank of self, row labels of going forward side by side;
The clock accuracy rank of self can be saved in the webserver by the base station having completed clock synchronous, as in gateway (GW) server.
In the present embodiment, the base station (HeNB and eNB) having completed clock synchronous needs to confirm the clock accuracy rank of self, can have multiple method when concrete confirmation, in present embodiment, arrange 0 for full accuracy rank, 1 takes second place, and the rest may be inferred.
As shown in Figure 4, the base station having completed clock synchronous judges that system clock is originated, and wherein, the clock accuracy rank adopting the base station of satellite GPS synchronizing signal is 0; The clock accuracy rank adopting the base station of clock synchronization of ad source 1588V2 is 1; The clock accuracy rank adopting the base station of one-level air interface synchronization is 2; The clock accuracy rank of the base station of air interface synchronization reaching or above grade two is adopted to be 3; Not synchronous with any external perimysium reference clock source and adopt the clock accuracy rank of the base station of inside of base station clock source to be 4.Clock accuracy rank can set according to actual.
Step 302: base station to be synchronized (HeNB) searches for the synchronizing signal of adjacent base station, choose base station that signal searches the most by force or at first as Reference BTS, set up synchronized relation, using the clock of Reference BTS as reference clock, according to the system clock of reference clock adjustment self, complete clock slightly synchronous;
In present embodiment, be search base station synchronizing signal after HeNB start to be synchronized, obtain synchronizing information, choose base station that signal searches the most by force or at first as Reference BTS, the computing of CP head is carried out to the synchronizing information of Reference BTS and obtains frequency offset information, according to the system clock of frequency offset information adjustment self, and carry out uplink/downlink frames proportioning, reach the object that clock is slightly synchronous.
Step 303: HeNB to be synchronized and adjacent base station carry out interacting message, obtains adjacent base station information;
Adjacent base station information can be the information such as cell ID.
Step 304: HeNB to be synchronized obtains the clock accuracy rank of adjacent base station according to adjacent base station information, and measures signal strength signal intensity and the path delay of time of adjacent base station;
HeNB to be synchronized can obtain the clock accuracy rank of adjacent base station from GW server.
Because HeNB position does not often have rule, and there is no GPS geography information, because obtaining reference clock, signal strength signal intensity and the chain-circuit time delay of now measuring adjacent base station can comparatively fast complete, but still need to adopt transmitting to mourn in silence mode to avoid producing interference to adjacent base station.
Step 305: HeNB to be synchronized computes weighted according to the signal strength signal intensity of adjacent base station and clock accuracy rank to the path delay of time;
In present embodiment, can also the result after ranking operation be normalized.
The formula of HeNB to be synchronized to the process that computes weighted the path delay of time from each adjacent base station is as follows:
L＝k
1×l
1+k
2×l
2+.....k
n×l
n
Wherein, l
1~ l
neach adjacent base station to the path delay of time of HeNB to be synchronized, k
1~ k
nfor the weight coefficient in the 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, and in present embodiment, determine that clock accuracy rank is higher, then weight coefficient is larger, otherwise less; Determine that the signal strength signal intensity of adjacent base station is larger, then corresponding weight coefficient is also larger, otherwise less.
Determine that the computational methods of 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 is regulation coefficient, and regulation coefficient can configure on backstage, comes to select optimal value according to actual conditions, the value of α and β needs to make k uprising and become large with clock precision grade and signal strength signal intensity, dies down and diminishes.
Step 306: HeNB to be synchronized adjusts reference clock according to ranking operation result, the accurate adjustment of completion system clock.
System clock can be adjusted forward above-mentioned ranking operation result by HeNB to be synchronized.
After the accurate adjustment of HeNB completion system clock to be synchronized, transmitter can be opened and come to work normally.HeNB to be synchronized also needs the clock accuracy rank setting self.
For the accumulated error preventing the skew of HeNB self clock from bringing, HeNB needs periodically to computing weighted the path delay of time, therefore, need to maintain Neighboring Cell List, and periodically Neighboring Cell List is upgraded, need to comprise the clock accuracy rank of adjacent base station, signal strength signal intensity and the path delay of time in the neighbor list, and periodically carry out clock accurate adjustment according to Neighboring Cell List.
In present embodiment, after the system clock of a base station adjustment self, by opening transmitter, make adjacent base station can receive the signal of this base station, to measure signal strength signal intensity and the path delay of time of this base station, this base station also should join in the Neighboring Cell List of self by adjacent base station.If the system clock of adjacent base station is also from air interface synchronization, then also can adopt the system clock of same method adjustment self, until network equalize, if the system clock of adjacent base station is from gps signal or network 1588 synchronizing signal, then do not need to adjust again.
As shown in Figure 5, present embodiment additionally provides a kind of clock synchronization apparatus, comprising: clock coarse regulation unit, information acquisition unit and clock essence adjustment unit, wherein:
Clock coarse regulation unit, for choosing Reference BTS from adjacent base station, using the clock of described Reference BTS as reference clock, according to the system clock of described reference clock adjustment self;
Information acquisition unit, for obtaining the clock accuracy rank of adjacent base station, and measures signal strength signal intensity and the path delay of time of adjacent base station;
Clock essence adjustment unit, for computing weighted to the path delay of time according to the signal strength signal intensity of described adjacent base station and clock accuracy rank, adjusts described system clock according to ranking operation result.
Described clock essence adjustment unit, specifically for adopting L=k
1× l
1+ k
2× l
2+ ... ..k
n× l
ncompute weighted to the path delay of time, wherein, L is ranking operation result, l
1~ l
nfor the path delay of time of each adjacent base station, k
1~ k
nfor the weight coefficient in the path delay of time of each adjacent base station of correspondence, k=α * T+ β * P is adopted 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, α and β is regulation coefficient.The value of α and β makes k uprising and become large with clock precision grade and signal strength signal intensity.
Clock essence adjustment unit, specifically for adjusting back described ranking operation result by described system clock.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, 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 amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a clock synchronizing method, is characterized in that, is applied in femto base station HeNB, comprises:
Reference BTS is chosen, using the clock of described Reference BTS as reference clock, according to described reference clock adjustment System clock from adjacent base station;
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, according to the signal strength signal intensity of described adjacent base station and clock accuracy rank, the path delay of time is computed weighted, adjust described system clock according to ranking operation result;
According to the signal strength signal intensity of described adjacent base station and clock accuracy rank, the path delay of time is computed weighted, comprising:
Adopt L=k
1× l
1+ k
2× l
2+ ... ..k
n× l
ncompute weighted to the path delay of time, wherein, L is ranking operation result, l
1~ l
nfor the path delay of time of each adjacent base station, k
1~ k
nfor the weight coefficient in the path delay of time of each adjacent base station of correspondence, k=α * T+ β * P is adopted 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, α and β is regulation coefficient;
Determine that the value of described α and β makes k uprising and become large with clock precision grade and signal strength signal intensity.
2. the method for claim 1, is characterized in that, according to ranking operation result adjustment System clock, comprising: described system clock is adjusted back described ranking operation result.
3. the method for claim 1, is characterized in that, also comprises:
Maintain Neighboring Cell List, in described Neighboring Cell List, comprise the clock accuracy rank of described adjacent base station, signal strength signal intensity and the path delay of time;
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, the path delay of time is computed weighted, adjust described system clock according to ranking operation result.
4. the method for claim 1, is characterized in that, also comprises:
After adjusting described system clock according to ranking operation result, set the clock accuracy rank of self, be saved in the webserver, and open transmitter and carry out work.
5. a clock synchronization apparatus, is characterized in that, comprising: clock coarse regulation unit, information acquisition unit and clock essence adjustment unit, wherein:
Described clock coarse regulation unit, for choosing Reference BTS from adjacent base station, using the clock of described Reference BTS as reference clock, according to described reference clock adjustment System clock;
Described information acquisition unit, for obtaining the clock accuracy rank of adjacent base station, and measures signal strength signal intensity and the path delay of time of adjacent base station;
Described clock essence adjustment unit, for computing weighted to the path delay of time according to the signal strength signal intensity of described adjacent base station and clock accuracy rank, adjusts described system clock according to ranking operation result;
Described clock essence adjustment unit, specifically for adopting L=k
1× l
1+ k
2× l
2+ ... ..k
n× l
ncompute weighted to the path delay of time, wherein, L is ranking operation result, l
1~ l
nfor the path delay of time of each adjacent base station, k
1~ k
nfor the weight coefficient in the path delay of time of each adjacent base station of correspondence, k=α * T+ β * P is adopted 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, α and β is regulation coefficient;
The value of described α and β makes k uprising and become large with clock precision grade and signal strength signal intensity.
6. device as claimed in claim 5, is characterized in that:
Described clock essence adjustment unit, specifically for adjusting back described ranking operation result by described system clock.
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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 | ||
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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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| CN103139809B true CN103139809B (en) | 2015-09-16 |
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| CN104812054B (en) | 2014-01-27 | 2019-09-17 | 中兴通讯股份有限公司 | A kind of delay inequality determines method, system, base station and user equipment |
| 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 |
| 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 |
| WO2016065642A1 (en) * | 2014-10-31 | 2016-05-06 | 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 |
| CN113810988B (en) * | 2020-06-16 | 2023-03-10 | 上海华为技术有限公司 | Data processing method and related equipment |
| 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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| CN101938827A (en) * | 2010-07-24 | 2011-01-05 | 福建邮科通信技术有限公司 | TD-SCDMA format Femtocell air interface synchronization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938827A (en) * | 2010-07-24 | 2011-01-05 | 福建邮科通信技术有限公司 | TD-SCDMA format Femtocell air interface synchronization method |
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