CN102075317A - Reliable time frequency synchronization method and system in home base station system - Google Patents
Reliable time frequency synchronization method and system in home base station system Download PDFInfo
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Abstract
The invention discloses a reliable time frequency synchronization method and a reliable time frequency synchronization in a home base station system. The system comprises a receiving unit, a global positioning system (GPS) receiving module, a clock synchronization unit and a controller, wherein the receiving unit is used for monitoring a wireless signal in the environment of the home base station; the GPS receiving module is used for receiving a GPS signal, and reporting the synchronization state and synchronization quality of the GPS to the controller; the clock synchronization unit is used for selecting a synchronization reference source according to an instruction of the controller, and realizing real-time switching among various synchronization reference sources according to the instruction of the controller; and the controller is used for determining whether to use the GPS output as a synchronization reference or not according to the synchronization state and the synchronization quality of the GPS, and controlling real-time switching of the clock synchronization unit among the various synchronization reference sources. By the method and the system, the aim of stable synchronization can be fulfilled by a synchronization method which combines a plurality of synchronization modes, the synchronization stability and reliability of the home base station system can be greatly improved, and the interference in application of the home base station system can be reduced.
Description
Technical field
The present invention relates to the microcell base station communication system, reliable time-frequency synchronization method and system in particular a kind of family base station system.
Background technology
Along with the 3G mobile communication system is perfect gradually in the construction in each main mobile communication market, the whole world, the number of users of mobile communication constantly increases fast, simultaneously also more and more abundanter based on the various applied business of mobile communication system, ever-increasing data service is explosive growth to the requirement of mobile broadband service, and then more and more higher to the requirement of mobile communication system bandwidth.On the other hand, because the quick growth of mobile communication causes utilizing frequency range more and more higher, the penetration capacity of wireless signal, diffracting power more and more a little less than, it is conflicting that this data service with the overwhelming majority occurs in indoor environment, traditional mode of utilizing outdoor high-power base station to cover on a large scale becomes more and more higher gradually to the cost that solves indoor data service, and can not satisfy the high power capacity demand of data service.
Since can plug and play, the frequency scrambler selected automatically, the Automatic Optimal power setting, power is little, both can satisfy jumbo demand, and can satisfy the advantage of covering again, Home eNodeB or title Femtocell base station are considered to solve important means of above-mentioned contradiction more and more widely.It is the difficult problem that widely apply puzzlement Femtocell base station that but the air interface synchronization that how to solve the strictness of Femtocell base station requires always, the Femtocell base station communication system of time division duplex (TDD) particularly, as TDD-SCDMA system, TDD-LTE system, not only need strict frequency accuracy, also will satisfy the time synchronized of the whole network strictness, this problem is more outstanding.
In present TDD Femtocell base station system, the widely used Time and Frequency Synchronization mode of industry has by eating dishes without rice or wine to be intercepted synchronously, receives synchronously by GPS, utilizes precision clock agreement (IEEE1588) synchronous by transmission network.Each method of synchronization all has the pluses and minuses of oneself, does not increase hardware cost substantially by air interface synchronization, but grand sometimes net swinging of signal can cause synchronization failure; Very accurate synchronously by GPS, but in the environment of indoor signal weak strength, the GPS time of locking is of a specified duration, even be difficult to locking; Utilize Precision Time Protocol not worry the instability and the interference problem of wireless signal synchronously, but at home environment, because the uncertainty of transmission is difficult to guarantee the symmetry transmission of up-downgoing time tag, thereby causes bigger synchronous error.
Therefore, at above-mentioned shortcoming, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide reliable time-frequency synchronization method and system in a kind of family base station system, be intended to solve existing Femtocell base station system, particularly in the TDD Femtocell system, the mode of carrying out Time and Frequency Synchronization can not realize the problem of the purpose of Time and Frequency Synchronization quickly and accurately.
Technical scheme of the present invention is as follows: reliable Time and Frequency Synchronization system in a kind of family base station system, wherein, comprise controller, GPS receiver module, receiving element and clock synchronization unit,
Described receiving element is used for the wireless signal of Home eNodeB place environment is intercepted;
Described GPS receiver module is used to receive gps signal, also is used for synchronous regime and synchronizing quality to controller reporting GPS;
Described clock synchronization unit is used for the Instruction Selection reference synchronization source according to controller, and is implemented in real-time switching between the multiple reference synchronization source according to the instruction of controller;
Whether described controller is used for using GPS output as reference synchronization according to the synchronous regime of GPS and synchronizing quality decision, controls the real-time switching of described clock synchronization unit between multiple reference synchronization source;
Described controller is connected with the clock synchronization unit with receiving element; Described receiving element connects GPS receiver module and clock synchronization unit; Described GPS receiver module connects controller and clock synchronization unit, and described clock synchronization unit is provided with synchronous output and clock output.
Reliable Time and Frequency Synchronization system in the described family base station system, wherein, described GPS receiver module is provided with the temperature compensating type quartz-crystal resonator, is used to clock synchronization unit clock signal.
Reliable Time and Frequency Synchronization system in the described family base station system, wherein, described system also comprises local oscillator, is used to described system that clock signal is provided, described local oscillator connects the clock synchronization unit.
Reliable time-frequency synchronization method in a kind of family base station system wherein, may further comprise the steps:
S1: the wireless signal to surrounding environment is intercepted, and will disturb minimum frequency to be chosen to be the operating frequency of this family base station, and the carrier frequency frequency that signal is the strongest is as the air interface synchronization reference source of this family base station;
S2: judging whether GPS locks, is execution in step S4 then, otherwise execution in step S3;
The S3:GPS receiver module quickens the lock of going into of GPS with reference to the output of air interface synchronization, when controller receive the GPS receiver module go into to lock message after, the base station switches to the GPS synchronous regime from the air interface synchronization state;
S4: the base station enters the GPS synchronous regime;
S5: judging whether GPS step-out occurs, is execution in step S6 then, otherwise execution in step S4;
S6: enter the GPS hold mode, and report synchronizing quality to give controller, and judge by controller whether synchronizing quality transfinites, if execution in step S7 then; Otherwise carry out the GPS hold mode;
S7: the base station switches to the air interface synchronization state from the GPS synchronous regime, then execution in step S3.
Reliable time-frequency synchronization method in the described family base station system, wherein, after the base station switched to the GPS synchronous regime from the air interface synchronization state, the GPS receiver module then need not the output with reference to air interface synchronization again.
Reliable time-frequency synchronization method in the described family base station system, wherein, described synchronizing quality is the synchronous time deviation of GPS.
Beneficial effect of the present invention: the present invention stablizes synchronous purpose by the method for synchronous in conjunction with the multiple method of synchronization to reach, improve synchronous stability and the reliability of Femtocell base station system greatly, thereby reduced the interference problem in the application of Femtocell base station system.
Description of drawings
Fig. 1 is the system block diagram that embodiments of the invention one are provided.
Fig. 2 is the system block diagram that embodiments of the invention two are provided.
Fig. 3 is the startup flow process of system provided by the invention and the schematic diagram of synchronous regime conversion.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.
Referring to Fig. 1, figure is the building-block of logic of the Femtocell base station system lock unit that provided of the embodiment of the invention one, comprises controller 100, GPS receiver module 101, receiving element 103 and clock synchronization unit 104.Described controller 100 is connected with clock synchronization unit 104 with receiving element 103; Described receiving element 103 connects GPS receiver module 101 and clock synchronization unit 104; Described GPS receiver module 101 connects controller 100 and clock synchronization unit 104, and described clock synchronization unit 104 is provided with synchronous output and clock output.
Described receiving element 103 is used for the wireless signal of place, Femtocell base station environment is intercepted; Described GPS receiver module 101 is used to receive gps signal, go back row clock lock unit 104 output stable clock signals simultaneously, also be used for reporting to controller 100 at any time synchronous regime and the synchronizing quality of GPS, whether 100 decisions use the basis for estimation of GPS output as reference synchronization as controller.The synchronous output of GPS receiver module 101 and receiving element 103 all inputs to clock synchronization unit 104, which input described clock synchronization unit 104 uses as reference synchronization according to the instruction of controller 100, and realizes real-time switching between multiple reference synchronization source according to the instruction of controller 100.
Because the GPS receiver module self has TCXO (Temperature Compensate X'tal Oscillator preferably, more stable clock output can be provided in the time of the temperature compensating type quartz-crystal resonator), so save the connection local oscillator in the present embodiment.This application for the Femtocell base station of cost sensitivity is a kind of saving mode of cost.
Its operation principle is: after Femtocell was base station initiated, at first the wireless signal of place, 103 pairs of Femtocell base stations of receiving element environment was intercepted, and controller 100 will disturb the operating frequency of minimum available frequency as oneself; Then to around the signal of strong frequency carry out frequency departure and the time synchronized point that demodulation obtains local clock, send to clock synchronization unit 104 then as the reference that the frequency deviation and the delivery time of this locality are done corresponding adjustment, to reach the purpose of Time and Frequency Synchronization.
Described GPS receiver module 101 is with reference to the output of air interface synchronization, and enters the locking time service stage fast.Controller 100 control clock synchronization unit 104 carry out with reference to change action, and the base station switches to the GPS synchronous regime from the air interface synchronization state, and notice GPS receiver module need not be with reference to the output of air interface synchronization, thereby reach the synchronous effect of higher accuracy.When the interim losing lock of GPS, system is introduced into the synchronous output of the maintenance pattern continuation use GPS of GPS, and the synchronous output quality of monitoring GPS, when the time deviation exceeds the thresholding of system requirements, system will be with reference to the output that switches to air interface synchronization once more, and continue to monitor the synchronous regime of GPS receiver module.
Referring to Fig. 2, the embodiment of the invention two also provides a kind of building-block of logic that is provided with the Femtocell base station system lock unit of local oscillator.
When some GPS receiver module 101 can not provide more stable clock to export, needing to increase a local oscillations source 102 provide stable clock output for described system.It comprises: controller 100, GPS receiver module 101, receiving element 103, clock synchronization unit 104 and local oscillator 102.Described controller 100 is connected with clock synchronization unit 104 with receiving element 103; Described receiving element 103 connects GPS receiver module 101 and clock synchronization unit 104; Described GPS receiver module 101 connects controller 100 and clock synchronization unit 104, and described local oscillator 102 connects clock synchronization unit 104.Described clock synchronization unit 104 is provided with synchronous output and clock output.
When showing the method for synchronization work that proposes according to the present invention as Fig. 3, a kind of typical flow process synchronously of Femtocell base station and the method flow diagram that synchronous regime is switched.It specifically may further comprise the steps:
Step S1: the wireless signal to surrounding environment is intercepted, and will disturb minimum frequency to be chosen to be the operating frequency of this Femtocell base station, and the carrier frequency frequency that signal is the strongest is as the air interface synchronization reference source of this family base station.
It is very necessary initially intercepting for the Femtocell base station, finds the operating frequency of disturbing selected this Femtocell base station of minimum frequency on the one hand, finds the air interface synchronization reference source of the strongest signal of frequency as this Femtocell base station simultaneously.Consider the situation that the indoor environment gps signal may be more weak, generally speaking, GPS does not also enter the locking time service stage after the system start-up, and this moment, system entered the air interface synchronization state automatically.
Step S2: judging whether GPS locks, is execution in step S4 then, otherwise execution in step S3.
Step S3:GPS receiver module quickens the lock of going into of GPS with reference to the output of air interface synchronization, when controller receive the GPS receiver module go into to lock message after, the base station switches to the GPS synchronous regime from the air interface synchronization state.
Be under the air interface synchronization state in the Femtocell base station system, controller can notify the GPS receiver module to quicken the lock of going into of GPS with reference to the output of air interface synchronization.After controller receives that the GPS receiver module is gone into the message of lock, can switch air interface synchronization to the GPS synchronous regime, and notice GPS receiver module need not be with reference to the output of air interface synchronization, thereby reach the synchronous effect of higher accuracy.
Step S4: the base station enters the GPS synchronous regime.
Step S5: judging whether GPS step-out occurs, is execution in step S6 then, otherwise execution in step S4.
Step S6: enter the GPS hold mode, and report synchronizing quality (time deviation) to give controller, and by judging whether synchronizing quality transfinites, if execution in step S7 then; Otherwise carry out the GPS hold mode.
Step S7: the base station switches to the air interface synchronization state from the GPS synchronous regime, then execution in step S3.
Because during the relatively poor step-out of spacing wave, system can enter synchronous hold mode as GPS, and this state still belongs to the GPS synchronous regime, and the GPS synchronous regime comprises GPS lock-out state and the synchronous hold mode of GPS; Report synchronizing quality to give controller simultaneously, whether controller switches to the air interface synchronization state according to the variation decision of synchronizing quality, in case switch to the air interface synchronization state by the GPS hold mode, controller can notify output that the GPS receiver module uses air interface synchronization as a reference once more, to quicken the lock of going into of GPS receiver module.Described synchronizing quality can be a time deviation, also may be the Frequency Synchronization accuracy.
When normal Femtocell is base station initiated, at first the wireless signal of place, Femtocell base station environment is intercepted, to determine to disturb the operating frequency of minimum available frequency as oneself; Then to around the signal of strong frequency carry out frequency departure and the time synchronized point that demodulation obtains local clock, as the reference that the frequency deviation and the delivery time of this locality are done corresponding adjustment, to reach the purpose of Time and Frequency Synchronization.
But because the problem that there is swinging of signal in the air interface synchronization mode and is difficult to accurately estimate propagation delay time causes actual synchronism deviation, and may cause unstable synchronously problem because of the shakiness of grand net signal.And traditional GPS receiver module can arrive more and more lower Sensitirity va1ue under the help of assistant GPS information, also can reach the state of locking and accurate time service in indoor environment, the time-frequency precision after its locking is far above the requirement of Femtocell system operate as normal.
So the present invention combines a kind of reliable and stable synchronization scenario that remedies mutually and can improve synchronization accuracy and retention time of formation with the air interface synchronization mode and the GPS method of synchronization.
But when the GPS receiver module did not also lock, system at first used the output of air interface synchronization as reference synchronization; After the GPS receiver module reaches locking, the reference synchronization of the synchronous output of GPS as system will preferentially be selected by system; When the interim losing lock of GPS, system is introduced into the synchronous output of the maintenance pattern continuation use GPS of GPS, and the synchronous output quality of monitoring GPS, when the time deviation exceeds the threshold value of system requirements, system will be with reference to the output that switches to air interface synchronization once more, and continue to monitor the synchronous regime of GPS receiver module.
Using under the situation of air interface synchronization as the reference synchronization source, the output with air interface synchronization simultaneously offers the GPS receiver module as a reference, goes into lock speed with what improve the GPS receiver module.When GPS is in hold mode, also might reenters lock-out state, and send the report of state exchange to controller owing to gps signal takes a turn for the better.
The present invention stablizes synchronous purpose by the method for synchronous in conjunction with the multiple method of synchronization to reach, and has improved synchronous stability and the reliability of Femtocell base station system greatly, thereby reduces the interference problem in the Femtocell system applies.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (7)
1. Time and Frequency Synchronization system reliably in the family base station system is characterized in that, comprises controller, GPS receiver module, receiving element and clock synchronization unit,
Described receiving element is used for the wireless signal of Home eNodeB place environment is intercepted;
Described GPS receiver module is used to receive gps signal, also is used for synchronous regime and synchronizing quality to controller reporting GPS;
Described clock synchronization unit is used for the Instruction Selection reference synchronization source according to controller, and is implemented in real-time switching between the multiple reference synchronization source according to the instruction of controller;
Whether described controller is used for using GPS output as reference synchronization according to the synchronous regime of GPS and synchronizing quality decision, controls the real-time switching of described clock synchronization unit between multiple reference synchronization source;
Described controller is connected with the clock synchronization unit with receiving element; Described receiving element connects GPS receiver module and clock synchronization unit; Described GPS receiver module connects controller and clock synchronization unit, and described clock synchronization unit is provided with synchronous output and clock output.
2. reliable Time and Frequency Synchronization system is characterized in that described GPS receiver module is provided with the temperature compensating type quartz-crystal resonator in the family base station system according to claim 1, is used to clock synchronization unit clock signal.
3. reliable Time and Frequency Synchronization system is characterized in that described system also comprises local oscillator in the family base station system according to claim 1, is used to described system that clock signal is provided, and described local oscillator connects the clock synchronization unit.
4. time-frequency synchronization method reliably in the family base station system is characterized in that, may further comprise the steps:
S1: the wireless signal to surrounding environment is intercepted, and will disturb minimum frequency to be chosen to be the operating frequency of this family base station, and the signal that frequency is the strongest is as the air interface synchronization reference source of this family base station;
S2: judging whether GPS locks, is execution in step S4 then, otherwise execution in step S3;
The S3:GPS receiver module quickens the lock of going into of GPS with reference to the output of air interface synchronization, when controller receive the GPS receiver module go into to lock message after, the base station switches to the GPS synchronous regime from the air interface synchronization state;
S4: the base station enters the GPS synchronous regime;
S5: judging whether GPS step-out occurs, is execution in step S6 then, otherwise execution in step S4;
S6: enter the GPS hold mode, and report synchronizing quality to give controller, and judge by controller whether synchronizing quality transfinites, if execution in step S7 then; Otherwise carry out the GPS hold mode;
S7: the base station switches to the air interface synchronization state from the GPS synchronous regime, then execution in step S3.
5. reliable time-frequency synchronization method in the family base station system according to claim 4 is characterized in that, after the base station switched to the GPS synchronous regime from the air interface synchronization state, the GPS receiver module then need not the output with reference to air interface synchronization again.
6. reliable time-frequency synchronization method is characterized in that described synchronizing quality is the synchronous time deviation of GPS in the family base station system according to claim 4.
7. reliable time-frequency synchronization method is characterized in that in the family base station system according to claim 4, and described GPS hold mode is that the GPS synchronous regime is continued to keep in the base station.
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| CN104601317A (en) * | 2014-12-31 | 2015-05-06 | 南京大全自动化科技有限公司 | Synchronous clock device of FPGA and control method thereof |
| WO2015172476A1 (en) * | 2014-05-16 | 2015-11-19 | 中兴通讯股份有限公司 | Synchronization method, controller, synchronization node, synchronous network, and storage medium |
| CN106937411A (en) * | 2017-03-23 | 2017-07-07 | 博威通讯系统(深圳)有限公司 | The Miniaturized Communications base station equipment of integrated ONU and household radio router |
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| CN110113124A (en) * | 2019-04-16 | 2019-08-09 | 河南顺博建筑智能化工程有限公司 | Clock synchronizing method and device for optical fiber vibration sensing system |
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| CN106937411A (en) * | 2017-03-23 | 2017-07-07 | 博威通讯系统(深圳)有限公司 | The Miniaturized Communications base station equipment of integrated ONU and household radio router |
| CN107147461A (en) * | 2017-04-07 | 2017-09-08 | 烽火通信科技股份有限公司 | The automatic selective system and method for a kind of LTE Femto access network methods of synchronization |
| CN110113124A (en) * | 2019-04-16 | 2019-08-09 | 河南顺博建筑智能化工程有限公司 | Clock synchronizing method and device for optical fiber vibration sensing system |
| CN113568300A (en) * | 2021-09-22 | 2021-10-29 | 深圳心派科技有限公司 | GPS time service method, device, electronic equipment and storage medium |
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Effective date of registration: 20170712 Address after: Cheng park high tech Zone Building 506B room 361101 south building industry in Fujian Province, Xiamen torch Patentee after: BRAVOCOM (XIAMEN) TECH Co.,Ltd. Address before: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road No. 008 SKYWORTH tower A 17 floor Patentee before: BRAVO TECH TELECOMMUNICATION SYSTEMS (SHENZHEN) Co.,Ltd. |
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Effective date of registration: 20201207 Granted publication date: 20130605 |
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Date of cancellation: 20221012 Granted publication date: 20130605 |
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Effective date of registration: 20230308 Address after: No. 10, Floor 5, Unit 2, Building 13, No. 138, Section 3, Changjiang Road, Xihanggang, Shuangliu District, Chengdu, Sichuan, 610200 Patentee after: Yang Xiaolin Address before: Room 506b, South Building, Chengye building, Pioneer Park, torch hi tech Zone, Xiamen, Fujian, 361101 Patentee before: BRAVOCOM (XIAMEN) TECH Co.,Ltd. |
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Correction item: Patentee|Address Correct: BRAVOCOM (XIAMEN) TECH Co.,Ltd.|Room 506b, South Building, Chengye building, Pioneer Park, torch hi tech Zone, Xiamen, Fujian, 361101 False: Yang Xiaolin|No. 10, Floor 5, Unit 2, Building 13, No. 138, Section 3, Changjiang Road, Xihanggang, Shuangliu District, Chengdu, Sichuan, 610200 Number: 12-01 Volume: 39 |
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Effective date of registration: 20230731 Address after: No. 10, 5th Floor, Unit 2, Building 13, No. 138, Section 3, Changjiang Road, Xihanggang, Shuangliu District, Chengdu City, Sichuan Province, 610000 Patentee after: Yang Xiaolin Address before: Room 506b, South Building, Chengye building, Pioneer Park, torch hi tech Zone, Xiamen, Fujian, 361101 Patentee before: BRAVOCOM (XIAMEN) TECH Co.,Ltd. |
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