CN105657816B - Maintain the method and apparatus of synchronization among base stations - Google Patents
Maintain the method and apparatus of synchronization among base stations Download PDFInfo
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- CN105657816B CN105657816B CN201610192592.0A CN201610192592A CN105657816B CN 105657816 B CN105657816 B CN 105657816B CN 201610192592 A CN201610192592 A CN 201610192592A CN 105657816 B CN105657816 B CN 105657816B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
Abstract
The present invention relates to a kind of method and apparatus for maintaining synchronization among base stations, wherein maintain the method for synchronization among base stations, the following steps are included: recording the size for adjusting the adjusted value of crystal oscillator in preset time period every time and corresponding present system time when base station is in synchronous regime；According to the size and present system time of the adjusted value of record, by the changing rule of adjusted value in statistical analysis preset time period, be adjusted value the fluctuating change period and corresponding variable quantity；When base station is in desynchronizing state, according to the fluctuating change period of adjusted value and corresponding variable quantity, maintained by periodically adjusting crystal oscillator synchronous.The present invention can effectively keep the long-time between base station synchronous, guarantee that intra-cell users are normally carried out business, avoid the formation of island mode；Meanwhile by the way of software realization, the synchronous maintenance function being applicable between all standard system base-stations in wireless communication system has saved hardware cost and development of manpower cost.
Description
Technical field
The present invention relates to the synchronization among base stations technology in mobile communication system, in particular to a kind of maintenance synchronization among base stations
Method and apparatus.
Background technique
In wireless communication system, different standard systems is contained, such as GSM (Global System for Mobile
Communication) second generation mobile communication system, CDMA2000 (Code Division Multiple Access
2000)/WCDMA(Wideband Code Division Multiple Access)/TD-SCDMA(Time Division-
Synchronous Code Division Multiple Access) 3-G (Generation Three mobile communication system), TDD (Test-Driven
Development (Long Term Evolution, is drilled)/FDD (Frequency Division Duplexing) LTE for a long time
Into) forth generation mobile communication system, and the 5th Generation Mobile Communication System from now on, the stationary problem between base station directly influences
The quality of radio communication service: inter-cell interference, handover between cells failure, speech quality difference and rate decline and other issues,
Influence intensive cell networking success or failure.
It in wireless communication system, is sent and received signals in same frequency range, if minizone does not keep synchronous, will appear ratio
More serious transmitting-receiving interferes with each other problem (also referred to as co-channel interference), and the mobile terminal in serving cell can not carry out regular traffic
Or the service such as switching.The even minizone of different systems or same standard different frequency range does not keep synchronous, will will appear cell yet
Between handover failure, or redirect failure the problems such as.Especially in the communication system of TDD duplex mode, minizone is needed to keep
On the basis of Frequency Synchronization, it is desirable that temporal precise synchronization (hundred nanoseconds) just can guarantee switching between ascending-descending subframes not
It interferes with each other.
Currently used synchronization among base stations mode mainly has GPS (Global Positioning System) synchronization, 1588
Synchronization is listened between (network) synchronization and base station.The GPS method of synchronization is generally used for the synchronization of outdoor base station minizone, is easy
It is influenced by the factors such as bad weather or GPS module self problem, it may appear that synchronization failure situation, especially in thunderstorm weather, pole
It may cause the unstable of GPS synchronization, short time interior appearance synchronization, step-out, resynchronisation, the Alternate Phenomenon of step-out occurs again.
1588 methods of synchronization are generally used for the synchronization between indoor base station cell, are to be communicated by network with clock server, warp
It is synchronous between clock server to cross system algorithm realization, and clock server itself is almost homologous with GPS, is easy
It is influenced by network communication quality, network jitter or packet loss etc. occurs and all may cause synchronization failure occur.Synchronization is listened to then to fit
It for the synchronization between all base station cells, is synchronized by listening to the downlink signal of target BS (synchronisation source)
, it is easy to be influenced by the state of target BS itself, if target BS step-out itself or unit exception, also lead to and listen to
Synchronization failure.Crystal oscillator full name is crystal oscillator, refers to and cuts thin slice (referred to as by certain azimuth from one piece of quartz crystal
Chip), quartz-crystal resonator, referred to as quartz crystal or crystal, crystal oscillator；And IC (Integrated is added inside encapsulation
Circuit: integrated circuit) composition oscillating circuit crystal element be known as crystal oscillator.Its by ambient temperature change and
The influence of crystal oscillator aging itself can cause oscillator drift, to generate frequency deviation.Common crystal oscillator has voltage controlled crystal oscillator
(VCXO) and temperature control crystal oscillator (TCXO), using more in mobile communication field as high precision reference signal source at present is pressure
Crystal oscillator is controlled, by configuring a digital value, through digiverter DAC, being converted into the size of analog signal, (amplitude leyel is big
It is small) adjust crystal oscillator.
During realization, inventor has found that at least there are the following problems in traditional technology: synchronous used in the base station
When the step-out of source, and when no available other methods of synchronization, to keep user's progress regular traffic in base station cell, avoiding base
Cell of standing moves back clothes, then is only capable of the performance by crystal oscillator itself.But crystal oscillator itself often by electromagnetic interference, mechanical shock and impact,
Humidity and temperature and aging etc. influence, and can ceaselessly generate frequency drift.The crystal oscillator no matter used is multistable fixed, all can be certain
Time in make base station generate it is unacceptable when partially or frequency deviation, cannot proceed normally industry so as to cause user in base station cell
Business, even makes base station cell move back clothes.
Summary of the invention
Based on this, it is necessary to aiming at the problem that the extremely caused step-out of traditional technology synchronisation source causes cell to be moved back to take, provide
A kind of method and apparatus maintaining synchronization among base stations.
To achieve the goals above, the embodiment of technical solution of the present invention are as follows:
On the one hand, a kind of method for maintaining synchronization among base stations is provided, comprising the following steps:
When base station is in synchronous regime, the size and correspondence for adjusting the adjusted value of crystal oscillator in preset time period every time are recorded
Present system time；
According to the size and present system time of the adjusted value of record, pass through adjusted value in statistical analysis preset time period
Changing rule, be adjusted value the fluctuating change period and corresponding variable quantity；
When base station is in desynchronizing state, according to the fluctuating change period of adjusted value and corresponding variable quantity, pass through the period
The adjustment crystal oscillator of property remains synchronous.
On the other hand, a kind of device for maintaining synchronization among base stations is provided, comprising:
Crystal oscillator adjusted value logging modle, for recording and being adjusted every time in preset time period when base station is in synchronous regime
The size of the adjusted value of crystal oscillator and corresponding present system time；
Crystal oscillator adjusted value changing rule determining module, for the size and present system time according to the adjusted value of record,
By statistical analysis preset time period in adjusted value changing rule, be adjusted value the fluctuating change period and corresponding variation
Amount；
Synchronous maintenance module, is used for when base station is in desynchronizing state, according to the fluctuating change period of adjusted value and correspondence
Variable quantity, maintained by periodically adjusting crystal oscillator synchronous.
Above-mentioned technical proposal has the following beneficial effects:
The present invention maintains the method and apparatus of synchronization among base stations, by base station synchronization, to the statistics of crystal oscillator adjusted value
Analysis, determines period of waves and the change value of adjusted value size variation, in base station clock step-out, by period of waves and change value
Crystal oscillator periodically is adjusted, extends the time that base station is in synchronous regime to realize, guarantees that UE in this time (use by mobile phone
Family) regular traffic and base station cell service it is normal.The present invention can effectively keep the long-time between base station synchronous, guarantee cell
Interior user is normally carried out business, avoids the formation of island mode；Meanwhile by the way of software realization, it is applicable to wirelessly communicate
Synchronous maintenance function between all standard system base-stations in system, has saved hardware cost and development of manpower cost.
Detailed description of the invention
Fig. 1 is the flow diagram for the embodiment of the method 1 that the present invention maintains synchronization among base stations；
Fig. 2 is that the present invention maintains the process that crystal oscillator adjusted value changing rule is determined in the embodiment of the method 1 of synchronization among base stations
Schematic diagram；
Fig. 3 is that the present invention maintains the synchronous flow diagram for maintaining processing in the embodiment of the method 1 of synchronization among base stations；
Fig. 4 is the process flow signal synchronized when remaining invalid in the embodiment of the method 1 of the invention for maintaining synchronization among base stations
Figure；
Fig. 5 is the flow diagram for one specific embodiment of method that the present invention maintains synchronization among base stations；
Fig. 6 is the structural schematic diagram for the Installation practice 1 that the present invention maintains synchronization among base stations.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give preferred embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is make it is more thorough and comprehensive to the disclosure.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
The embodiment of the method 1 of present invention maintenance synchronization among base stations:
It is taken to solve the problems, such as that the extremely caused step-out of traditional technology synchronisation source causes cell to be moved back, the present invention provides one
Kind maintains the embodiment of the method 1 of synchronization among base stations, and Fig. 1 is that the present invention maintains the process of the embodiment of the method 1 of synchronization among base stations to show
It is intended to；As shown in Figure 1, may comprise steps of:
Step S110: when base station is in synchronous regime, the adjusted value for adjusting crystal oscillator in preset time period every time is recorded
Size and corresponding present system time；
Step S120: according to the size and present system time of the adjusted value of record, by statisticalling analyze preset time period
The changing rule of interior adjusted value, be adjusted value the fluctuating change period and corresponding variable quantity；
Step S130: when base station is in desynchronizing state, according to the fluctuating change period of adjusted value and corresponding variable quantity,
It is maintained by periodically adjusting crystal oscillator synchronous.
Wherein, in a specific embodiment, in step s 110, the adjustment time of each crystal oscillator is can to configure
, and the adjustment time of the different methods of synchronization can be different, it is only necessary to current adjustment is recorded when adjustment crystal oscillator every time
Value and system time, generally in seconds and be no more than half a minute be best.
In a specific embodiment, step S120 may include:
According to the size and present system time of the adjusted value of record, the maximum of adjusted value in current time particle is obtained
Value and minimum value；Maximum value and minimum value to adjusted value carry out averaged processing, obtain the ginseng of current time particle
Examine value；Time particle is preset adjusted value variable cycle；
Intragranular reference value of two neighboring time is identical or the difference of two reference values is in preset and refers to thresholding
When in value, the size and return for increasing current time particle in the range of preset time particle threshold obtain the step of reference value
Suddenly；
It is greater than preset time particle threshold value or intragranular ginseng of two neighboring time in the size of current time particle
Examine value difference be greater than preset reference thresholds when, obtain current time particle size and corresponding adjusted value；It will work as
The size of preceding time particle and corresponding adjusted value respectively as adjusted value the fluctuating change period and corresponding variable quantity into
Row output.
In a specific embodiment, the period for the adjustment crystal oscillator that the initial value of above-mentioned time particle is 2 times；It is above-mentioned pre-
If time particle threshold is 30 minutes；Above-mentioned preset time particle threshold value can be changed according to practical application, but
Maximum no more than preset time particle threshold, i.e. preset time particle threshold value are less than preset time particle threshold.
Specifically, Fig. 2 is that the present invention maintains to determine crystal oscillator adjusted value variation rule in the embodiment of the method 1 of synchronization among base stations
The flow diagram of rule；As shown in Fig. 2, preset minimum time particle can adjust the period for twice of crystal oscillator, the time is determined
Intragranular minimum and maximum crystal oscillator adjusted value after being averaging to minimum and maximum crystal oscillator adjusted value, obtains reference value.If being separated by
Two intragranular reference values of minimum time are identical or their difference is in some preset threshold value, then change time particle
Size.Meanwhile can set constraint condition: maximum time particle is not greater than 30 minutes.
The current time particle for meeting above-mentioned condition appropriate can detect the variation of crystal oscillator.It is too small to will lead to adjustment
Crystal oscillator number is excessive, excessive, may result in artificial tuningout crystal oscillator, in addition introduce bigger frequency deviation or when it is inclined.Determine crystal oscillator tune
Role is whole value changing rule in embodiments of the present invention: determining the suitable adjustment time period, avoids the period too small
Cause excessively frequently to adjust crystal oscillator or the period excessive possible bigger error introduced.In addition, output valve different twice in Fig. 2
Between system time it is poor, as adjustment time section (unit is hour, is rounded up: can refer to herein display the time format be
Make within 24 hours) wherein, adjustment time unit can be second grade.Local array can reach 24*60*60, therefore unit can be with
To second grade；It can keep synchronous with adjusted value by this time particle in the adjustment time section.
In a specific embodiment, the present invention maintain synchronization among base stations embodiment of the method 1 can with comprising steps of
In the real-time process for remaining synchronous, whether the synchronisation source that detection base station uses restores normal；
When the result of detection is to be, the size of the adjusted value of crystal oscillator and right is adjusted in return recording preset time period every time
The step of present system time answered；
When the result of detection is no, passes back through and adjust crystal oscillator periodically to maintain synchronous step.
Specifically, Fig. 3 is that the present invention maintains the synchronous process for maintaining processing in the embodiment of the method 1 of synchronization among base stations to show
It is intended to；As shown in figure 3, may further determine that whether synchronisation source restores normal when system is in maintenance synchronous regime.If same
Step source restores that normal (for example the of short duration pulse per second (PPS) loss of GPS, air interface synchronization Target cell signal restore normal or 1588 synchronised clocks
Server and network communication quality restore normal), then it can return to step S110 and carry out normal synchronized；Otherwise it will also be at
Maintain synchronous regime.Wherein, generally it can determine whether synchronisation source restores by simply adjudicating and (whether having useful signal)
Normally, i.e. whether GPS has whether continuous effectively pulse per second (PPS), 1588 have continuous effectively synchronous package and the cell of target BS
Whether signal power is normal.
In a specific embodiment, synchronisation source mentioned in the present invention can be a general term: when the method for synchronization is
When air interface synchronization, synchronisation source also refers to target BS；When the method for synchronization is GPS, synchronisation source also refers to GPS satellite
Signal；When the method for synchronization is 1588 synchronous, synchronisation source also refers to 1588 clock servers.
In a specific embodiment, the present invention maintain synchronization among base stations embodiment of the method 1 can with comprising steps of
When determining that the real-time process for remaining synchronous by periodically adjusting crystal oscillator is invalid, base station is carried out again same
Step or reboot process.
In a specific embodiment, above-mentioned determination maintains synchronous real-time process by periodically adjusting crystal oscillator
Invalid step may include:
Base station uplink BLER (having the ratio between the block of mistake and the received total block data of digital circuit: BLER(block error rate)) value and under
When row BLER value is more than that the reception level value of default BLER threshold value and uplink is greater than preset normal power threshold value, determine
Maintain the real-time process of base station synchronization invalid.
Specifically, Fig. 4 is that the present invention maintains to synchronize processing when remaining invalid in the embodiment of the method 1 of synchronization among base stations
Flow diagram；As shown in figure 4, it is whether effective that maintenance synchronization will be adjudicated in real time when system is in synchronous maintenance state.Judgement
Method are as follows: detection uplink and downlink BLER, when uplink and downlink BLER above preset threshold value (threshold value) in advance, simultaneously
When the reception level of uplink is higher than normal level, determines synchronous maintenance failure, can then carry out the switching of other methods of synchronization
Or base station is restarted.
The embodiment of the method 1 of maintenance synchronization among base stations of the invention can effectively keep the long-time between base station synchronous, protect
Card intra-cell users are normally carried out business, avoid the formation of island mode；Effectively avoid the exception in the synchronisation source short time caused
Synchronization failure synchronizes unstable；Reduce the probability that clothes are moved back in base station cell.Meanwhile by the way of software realization, it is applicable to
Synchronous between all standard system base-stations in wireless communication system maintains function, saved hardware cost and development of manpower at
This.
It is special with brilliant using VCXO in order to be further elaborated on the technical solution that the present invention maintains the method for synchronization among base stations
For the mobile communication system that vibration high precision reference signal source uses, illustrate that the present invention maintains the realization of the method for synchronization among base stations
Process, Fig. 5 are the flow diagram for one specific embodiment of method that the present invention maintains synchronization among base stations；As shown in figure 5, can wrap
Include following steps:
Step S510: when base station is in synchronous regime, when adjusting crystal oscillator every time, adjusted value size is recorded, and current
System time.
Specifically, when base station is in synchronous regime, can periodically adjust crystal oscillator, the main purpose adjusted every time be for
Tracking crystal oscillator causes oscillator drift (i.e. frequency deviation) and synchronisation source sheet with external environment variation and crystal oscillator aging itself
The frequency drift of body.Every time while adjustment crystal oscillator, current adjusted value size and current system time (24 are recorded
Hour system: the format of time is shown), it is recorded in a local biggish array space, array location number are as follows: 24*60*60/
The adjustment period (is converted to second grade)；
Step S520: the changing rule of statistical analysis crystal oscillator adjusted value: adjusted value changes size and variable cycle.
Specifically, the changing rule flow chart of statistical analysis crystal oscillator adjusted value as shown in Fig. 2, initialize adjusted value first
In the period for the adjustment crystal oscillator that variable cycle (time particle) is twice, obtain the maximum value and most of adjusted value in current time particle
Small value obtains reference value after maximum value and minimum value to adjusted value are averaging.
If being separated by, two time intragranular reference values are identical or difference (can match in some in advance preset threshold value
Set, be initialized as 10), indicating that current time particle is too small, crystal oscillator do not change also or change it is smaller can be ignored, therefore can be appropriate
Become larger time particle, by changing the size of time particle and carrying out statistical to the adjusted value in time granular size again
Analysis.If time granular size is more than threshold value (configurable, to be initialized as 5 minutes) or is separated by two time intragranular reference values
Preset threshold value is differed by more than, then exports current time granular size and adjusted value, the time particle for exporting current is big
Small and adjusted value changes size respectively as variable cycle time size and adjusted value
Step S530: when base station is in desynchronizing state, according to above-mentioned steps statistically analyze crystal oscillator adjusted value changing rule,
Size periodically is changed according to variable cycle time size and adjusted value and removes adjustment crystal oscillator, maintains base station synchronization.
Specifically, will lead to base station when synchronisation source dropout or synchronisation source signal quality are deteriorated and adjudicate current shape
State is desynchronizing state, will be entered in the process for maintaining base station synchronization at this time, as shown in Figure 3.Maintain base station synchronization method be
According to the crystal oscillator adjusted value changing rule that above-mentioned steps statistically analyze, periodically according to variable cycle time size and adjusted value
It changes size and removes adjustment crystal oscillator, while whether the synchronisation source for adjudicating base station being restored normally, to open if synchronisation source restores normal
Dynamic normal synchronized process, it is on the contrary then carry out periodically maintaining synchronization process；
Step S540: base station is in when maintaining synchronous regime, while being adjudicated synchronous whether maintain failure.Court verdict will be certainly
Determine how follow-up process carries out.
Specifically, maintaining the synchronous judgement process whether to fail as shown in Figure 4.When the BLER value for detecting uplink and downlink is super
Cross threshold value (being initialized as 20%), and uplink receiving level value be greater than preset normal power thresholding when, will judgement synchronize
Failure is maintained, report and alarm is laid equal stress on starting system.Conversely, synchronous remain normal, synchronous maintenance process flow will be continued.Its
In, the initial value of preset normal power thresholding can be -100dBm (decibel millivolt).
The present invention maintains one specific embodiment of method of synchronization among base stations, by base station synchronization, to crystal oscillator adjusted value
Statistical analysis, determine period of waves and the change value of adjusted value size variation, in base station clock step-out, by period of waves and
Change value periodically adjusts crystal oscillator, extends the time that base station is in synchronous regime to realize, guarantees UE in this time
Regular traffic and base station cell service it is normal.Meanwhile the present invention only collects adjusted value and adjusts to crystal oscillator, is not related to appointing
What communication standard, therefore it is suitable for existing all mobile communication systems used using VCXO crystal oscillator high precision reference signal source
System.The advantages that present invention realizes have implementation complexity low by way of software, at low cost, portable good.
The Installation practice 1 of present invention maintenance synchronization among base stations:
The technical idea of method based on above-mentioned maintenance synchronization among base stations, at the same it is abnormal in order to solve traditional technology synchronisation source
Caused step-out causes cell to move back the problem of taking, and the present invention also provides a kind of Installation practice 1 for maintaining synchronization among base stations, figures
6 maintain the structural schematic diagram of the Installation practice 1 of synchronization among base stations for the present invention, as shown in fig. 6, may include:
Crystal oscillator adjusted value logging modle 610, for recording and being adjusted every time in preset time period when base station is in synchronous regime
The size of the adjusted value of whole crystal oscillator and corresponding present system time；
Crystal oscillator adjusted value changing rule determining module 620, when for according to the size and current system of the adjusted value of record
Between, by the changing rule of adjusted value in statistical analysis preset time period, it is adjusted fluctuating change period of value and corresponding
Variable quantity；
Synchronous maintenance module 630, for when base station is in desynchronizing state, according to fluctuating change period of adjusted value and right
The variable quantity answered is maintained synchronous by periodically adjusting crystal oscillator.
In a specific embodiment, the Installation practice 1 of present invention maintenance synchronization among base stations can also include:
Synchronous detection module 640, in the real-time process that synchronous maintenance module remains synchronous, detection base station to be used
Whether synchronisation source restores normal.
In a specific embodiment, the Installation practice 1 of present invention maintenance synchronization among base stations can also include:
It is synchronous to maintain failure handling module 650, for determining the reality for remaining synchronous by periodically adjusting crystal oscillator
When process inefficient when, re-synchronization or reboot process are carried out to base station.
In a specific embodiment, synchronous maintenance failure handling module may include:
Judging module 652, for the uplink BLER value and downlink BLER value in base station be more than default BLER threshold value and
When the reception level value of uplink is greater than preset normal power threshold value, determines and maintain the real-time process of base station synchronization invalid.
Specifically, the device of maintenance synchronization among base stations of the invention, may include:
Crystal oscillator adjusted value logging modle, the periodic cycle for completing the crystal oscillator adjusted value in 24 hours record, storage
Array space size are as follows: the 24*60*60/ adjustment period (is converted to second grade).
Crystal oscillator adjusted value changing rule determining module changes size and variation for completing the crystal oscillator adjusted value in 24 hours
The determination in period.
Synchronous maintenance module, for changing size and variable cycle according to the crystal oscillator adjusted value of above-mentioned determination, periodically
Crystal oscillator Configuration Values are adjusted, achieve the purpose that remain synchronous.
Whether synchronous detection module is restored normally for real-time detection clock synchronisation source, when clock synchronisation source restores normal
When, by the synchronous process of starting normal clock.
It is synchronous to maintain failure decision process module, according to the statistical result and uplink receiving level of uplink and downlink BLER value
Measured value, synchronous maintain whether to fail to adjudicate.Failure is maintained if synchronous, and report and alarm is laid equal stress on starting system.
The present invention maintains the Installation practice 1 of synchronization among base stations, by base station synchronization, to the statistics of crystal oscillator adjusted value
Analysis, determines period of waves and the change value of adjusted value size variation, in base station clock step-out, by period of waves and change value
Crystal oscillator periodically is adjusted, to realize that extension base station is in time of synchronous regime, guarantees that UE's in this time is normal
Business and base station cell service are normal.The present invention can effectively keep the long-time between base station synchronous, guarantee intra-cell users just
Business is often carried out, island mode is avoided the formation of；Meanwhile by the way of software realization, it is applicable in wireless communication system
Synchronous maintenance function between all standard system base-stations, has saved hardware cost and development of manpower cost.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (6)
1. a kind of method for maintaining synchronization among base stations, which comprises the following steps:
When base station is in synchronous regime, records the size for adjusting the adjusted value of crystal oscillator in preset time period every time and corresponding work as
Preceding system time；
According to the size of the adjusted value of record and the present system time, by described in statistical analysis preset time period
The changing rule of adjusted value, obtain the adjusted value the fluctuating change period and corresponding variable quantity；
When the base station is in desynchronizing state, according to the fluctuating change period of the adjusted value and corresponding variable quantity, pass through
Adjust crystal oscillator periodically to remain synchronous；
When determining described by periodically adjusting crystal oscillator and maintaining that synchronous real-time process is invalid, weight is carried out to the base station
New synchronization or reboot process；
It determines and described maintain synchronous real-time process by periodically adjusting crystal oscillator invalid step includes: in the base station
Uplink BLER value and downlink BLER value be more than default BLER threshold value and uplink reception level value be greater than it is preset normal
When power threshold, determines and maintain the real-time process of the base station synchronization invalid.
2. the method according to claim 1 for maintaining synchronization among base stations, which is characterized in that according to the adjusted value of record
Size and the present system time, by statistical analysis preset time period in the adjusted value changing rule, obtain institute
The fluctuating change period and the step of corresponding variable quantity for stating adjusted value include:
According to the size of the adjusted value of record and the present system time, adjusted value in current time particle is obtained
Maximum value and minimum value；Maximum value and minimum value to the adjusted value carry out averaged processing, obtain the current time
The reference value of particle；The time particle is preset adjusted value variable cycle；
Intragranular reference value of two neighboring time is identical or the difference of described two reference values is in preset and refers to thresholding
When in value, increases in the range of preset time particle threshold and obtain reference value described in the size of current time particle and return
The step of；
It is greater than preset time particle threshold value or intragranular reference value of two neighboring time in the size of current time particle
Difference be greater than the preset reference thresholds when, obtain current time particle size and corresponding adjusted value；It will work as
The size of preceding time particle and corresponding adjusted value are respectively as fluctuating change period of the adjusted value and described corresponding
Variable quantity is exported.
3. the method according to claim 2 for maintaining synchronization among base stations, which is characterized in that the initial value of the time particle
For the period of 2 times of adjustment crystal oscillator；The preset time particle threshold is 30 minutes；The preset time particle threshold value is less than
The preset time particle threshold.
4. according to claim 1 to the method for maintenance synchronization among base stations described in 3 any one, which is characterized in that in the base
When standing in desynchronizing state, according to the fluctuating change period of the adjusted value and corresponding variable quantity, by periodically adjusting
Crystal oscillator maintains to further comprise the steps of: after synchronous step
In the real-time process for maintaining synchronization, detect whether the synchronisation source that the base station uses restores normal；
When the result of the detection is to be, the size for adjusting the adjusted value of crystal oscillator in the record preset time period every time is returned
The step of with corresponding present system time；
When the result of the detection is no, return is described to maintain synchronous step by periodically adjusting crystal oscillator.
5. a kind of device for maintaining synchronization among base stations characterized by comprising
Crystal oscillator adjusted value logging modle, for recording in preset time period and adjusting crystal oscillator every time when base station is in synchronous regime
Adjusted value size and corresponding present system time；
Crystal oscillator adjusted value changing rule determining module, when for according to size and the current system of the adjusted value of record
Between, by the changing rule of the adjusted value in statistical analysis preset time period, obtain the fluctuating change period of the adjusted value
With corresponding variable quantity；
Synchronous maintenance module, for when the base station be in desynchronizing state, according to the fluctuating change period of the adjusted value with
Corresponding variable quantity is maintained synchronous by periodically adjusting crystal oscillator；
It is synchronous to maintain failure handling module, for determining the real-time mistake for maintaining synchronization by periodically adjusting crystal oscillator
When Cheng Wuxiao, the base station carries out re-synchronization or reboot process；
The synchronous maintenance failure handling module includes: judging module, for the uplink BLER value and downlink in the base station
When BLER value is more than that the reception level value of default BLER threshold value and uplink is greater than preset normal power threshold value, dimension is determined
The real-time process for holding the base station synchronization is invalid.
6. the device according to claim 5 for maintaining synchronization among base stations, which is characterized in that further include:
Synchronous detection module, for detecting the base station and using in the real-time process that the synchronous maintenance module remains synchronous
Synchronisation source whether restore normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192592.0A CN105657816B (en) | 2016-03-30 | 2016-03-30 | Maintain the method and apparatus of synchronization among base stations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192592.0A CN105657816B (en) | 2016-03-30 | 2016-03-30 | Maintain the method and apparatus of synchronization among base stations |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105657816A CN105657816A (en) | 2016-06-08 |
| CN105657816B true CN105657816B (en) | 2019-03-19 |
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| CN108064079B (en) * | 2016-11-09 | 2020-08-18 | 大唐移动通信设备有限公司 | Clock synchronization method and base station |
| CN110430614B (en) * | 2019-08-06 | 2021-08-31 | 深圳前海中电慧安科技有限公司 | Base station signal synchronization method, device, equipment and storage medium based on GPS signal |
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| CN1312472A (en) * | 2000-10-30 | 2001-09-12 | 华中科技大学 | Synchronous transient-process recording method and device |
| CN101465686A (en) * | 2007-12-19 | 2009-06-24 | 中兴通讯股份有限公司 | Method and apparatus for implementing TD-SCDMA base station synchronization |
| 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 |
| WO2012016496A1 (en) * | 2010-08-02 | 2012-02-09 | 中兴通讯股份有限公司 | Clock control method, device and base station for input having multiple reference sources |
| CN104158616A (en) * | 2014-07-28 | 2014-11-19 | 京信通信系统（中国）有限公司 | Clock synchronization method and device in optical fiber transmission system |
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Patent Citations (5)
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| CN1312472A (en) * | 2000-10-30 | 2001-09-12 | 华中科技大学 | Synchronous transient-process recording method and device |
| CN101465686A (en) * | 2007-12-19 | 2009-06-24 | 中兴通讯股份有限公司 | Method and apparatus for implementing TD-SCDMA base station synchronization |
| 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 |
| WO2012016496A1 (en) * | 2010-08-02 | 2012-02-09 | 中兴通讯股份有限公司 | Clock control method, device and base station for input having multiple reference sources |
| CN104158616A (en) * | 2014-07-28 | 2014-11-19 | 京信通信系统（中国）有限公司 | Clock synchronization method and device in optical fiber transmission system |
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