CN102075317B - Reliable time frequency synchronization method and system in home base station system - Google Patents
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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, in particular reliable time-frequency synchronization method and system in a kind of family base station system.
Background technology
Along with the 3G mobile communication system is perfect gradually in the construction of each main Mobile Communications Market of the whole world, the number of users of mobile communication is rapid growth constantly, the various applied business of movement-based communication system are also more and more abundanter simultaneously, 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 rapid 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 that outdoor high-power base station covers on a large scale of utilizing 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.
Due to can plug and play, automatically select the frequency scrambler, the Automatic Optimal power setting, power is little, both can satisfy jumbo demand, can satisfy again the advantage of covering, Home eNodeB or claim the Femtocell base station to be considered to more and more widely solve important means of above-mentioned contradiction.But how to solve the strict air interface synchronization requirement in Femtocell base station is the difficult problem of a puzzlement Femtocell base station extensive application 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 strict time synchronized of the whole network, this problem is more outstanding.
In present TDD Femtocell base station system, the widely used Time and Frequency Synchronization mode of industry has to be intercepted by eating dishes without rice or wine synchronously, receives synchronously by GPS, utilizes precision clock agreement (IEEE1588) synchronous by transmission network.Each method of synchronization has the pluses and minuses of oneself, does not substantially increase hardware cost by air interface synchronization, but grand net swinging of signal can cause synchronization failure sometimes; Synchronously very accurate by GPS, but in the environment of indoor signal weak strength, it is of long duration that GPS locks, and even is difficult to locking; Utilize Precision Time Protocol synchronously not worry the unstable and interference problem of wireless signal, but at home environment, due to the uncertainty of transmission, be difficult to guarantee the symmetry transmission of up-downgoing time tag, thereby cause larger synchronous error.
Therefore, for 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 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 synchronous unit,
Described receiving element is used for the wireless signal of Home eNodeB place environment is intercepted;
Described GPS receiver module is used for receiving gps signal, also is used for synchronous regime and synchronizing quality to controller reporting GPS;
Described clock synchronous unit is used for the Instruction Selection reference synchronization source according to controller, and realizes real-time switching between the multiple synchronization reference source according to the instruction of controller;
Whether described controller is used for determining to use GPS output as reference synchronization according to the synchronous regime of GPS and synchronizing quality, controls the real-time switching of described clock synchronous unit between the multiple synchronization reference source;
Described controller and receiving element are connected with the clock synchronous unit; Described receiving element connects GPS receiver module and clock synchronous unit; Described GPS receiver module connects controller and clock synchronous unit, and described clock synchronous unit arranges synchronous output and clock output.
Reliable Time and Frequency Synchronization system in described family base station system, wherein, described GPS receiver module is provided with the temperature compensating type quartz-crystal resonator, is used to clock synchronous unit clock signal.
Reliable Time and Frequency Synchronization system in 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 synchronous unit.
Reliable time-frequency synchronization method in a kind of family base station system wherein, comprises the following 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, otherwise execution in step S3;
The S3:GPS receiver module accelerates the lock that enters of GPS with reference to the output of air interface synchronization, when controller receive the GPS receiver module enter 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, otherwise execution in step S4;
S6: enter the GPS hold mode, and report synchronizing quality to controller, and judge by controller whether synchronizing quality transfinites, if execution in step S7; 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 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 need not the output with reference to air interface synchronization again.
Reliable time-frequency synchronization method in 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 synchronous method in conjunction with the multiple synchronization mode to reach, greatly improve synchronous stability and the reliability of Femtocell base station system, 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 provide.
Fig. 2 is the system block diagram that embodiments of the invention two provide.
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, developing simultaneously referring to accompanying drawing, 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 provides of the embodiment of the present invention one, comprises controller 100, GPS receiver module 101, receiving element 103 and clock synchronous unit 104.Described controller 100 and receiving element 103 are connected with the clock synchronous unit and are connected; Described receiving element 103 connects GPS receiver modules 101 and clock synchronous unit 104; Described GPS receiver module 101 connects controllers 100 and clock synchronous unit 104, and described clock synchronous unit 104 arranges 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 for receiving gps signal, go back simultaneously the clock signal of row clock lock unit 104 stable outputs, also be used for reporting to controller 100 at any time synchronous regime and the synchronizing quality of GPS, determine whether to use GPS output as the basis for estimation of reference synchronization as controller 100.The synchronous output of GPS receiver module 101 and receiving element 103 all inputs to clock synchronous unit 104, which input described clock synchronous unit 104 uses as reference synchronization according to the instruction of controller 100, and realizes real-time switching between the multiple synchronization reference source according to the instruction of controller 100.
Because GPS receiver module self is with 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 minimum available frequency as the operating frequency of oneself; Then to around the signal of strong frequency carry out frequency departure and the time synchronized point that demodulation obtains local clock, then send to clock synchronous unit 104 as the reference that 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 fast the locking time service stage.Controller 100 is controlled clock synchronous unit 104 and is carried out reference and switch action, and the base station switches to the GPS synchronous regime from the air interface synchronization state, and notifies the GPS receiver module need not be with reference to the output of air interface synchronization, thereby reaches the synchronous effect of higher accuracy.When the interim losing lock of GPS, system is introduced into the synchronous output of the Holdover mode continuation use GPS of GPS, and the synchronous output quality of monitoring GPS, when the time deviation exceeds the thresholding of system requirements, system is with reference to the output that again switches to air interface synchronization, and continuation monitors the synchronous regime of GPS receiver module.
Referring to Fig. 2, the embodiment of the present 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 the output of more stable clock, needing to increase a local oscillations source 102 provided stable clock output for described system.It comprises: controller 100, GPS receiver module 101, receiving element 103, clock synchronous unit 104 and local oscillator 102.Described controller 100 and receiving element 103 are connected with the clock synchronous unit and are connected; Described receiving element 103 connects GPS receiver modules 101 and clock synchronous unit 104; Described GPS receiver module 101 connects controllers 100 and clock synchronous unit 104, and described local oscillator 102 connects clock synchronous unit 104.Described clock synchronous unit 104 arranges synchronous output and clock output.
When showing as Fig. 3 the method for synchronization work that proposes according to the present invention, the method flow diagram that a kind of typical synchronous flow process of Femtocell base station and synchronous regime are switched.It specifically comprises the following 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 on the one hand the operating frequency of disturbing selected this Femtocell of minimum frequency base station, finds simultaneously the strongest signal of frequency as the air interface synchronization reference source of this Femtocell base station.Consider that the indoor environment gps signal may weak situation, generally, after system starts, GPS does not also enter the locking time service stage, and this moment, system entered the air interface synchronization state automatically.
Step S2: judging whether GPS locks, is execution in step S4, otherwise execution in step S3.
Step S3:GPS receiver module accelerates the lock that enters of GPS with reference to the output of air interface synchronization, when controller receive the GPS receiver module enter 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 accelerate the lock that enters of GPS with reference to the output of air interface synchronization.After controller receives that the GPS receiver module enters 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, 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; 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 the synchronization state as GPS, and this state still belongs to the GPS synchronous regime, and the GPS synchronous regime comprises GPS lock-out state and GPS synchronization state; Report simultaneously synchronizing quality to controller, controller determines whether to switch to the air interface synchronization state according to the variation 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 again, to accelerate the lock that enters of GPS receiver module.Described synchronizing quality can be time deviation, may be also 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 disturbing minimum available frequency as the operating frequency of 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 frequency deviation and the delivery time of this locality are done corresponding adjustment, to reach the purpose of Time and Frequency Synchronization.
But due to the problem that there is swinging of signal in the air interface synchronization mode and is difficult to accurately estimate propagation delay time, cause actual synchronism deviation, and may cause because of the shakiness of grand net signal synchronous unstable problem.And traditional GPS receiver module can arrive more and more lower Sensitirity va1ue under the help of assistant GPS information, also can reach locking and the state of precision time service in indoor environment, the time-frequency precision after its locking is far above the requirement of Femtocell system normal operation.
So the present invention combines a kind of reliable and stable synchronization scenario that mutually makes up and can improve synchronization accuracy and retention time of formation with air interface synchronization mode and the GPS method of synchronization.
But when the GPS receiver module did not also lock, at first system used the output of air interface synchronization as reference synchronization; After the GPS receiver module reaches locking, system will preferentially select the synchronous output of GPS as the reference synchronization of system; When the interim losing lock of GPS, system is introduced into the synchronous output of the Holdover mode 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 is with reference to the output that again switches to air interface synchronization, and continuation monitors the synchronous regime of GPS receiver module.
In the situation that use air interface synchronization as the reference synchronization source, the output with air interface synchronization simultaneously offers the GPS receiver module as a reference, enters lock speed with what improve the GPS receiver module.When GPS is in hold mode, also might reenters lock-out state because gps signal takes a turn for the better, and send the report of state conversion to controller.
The present invention stablizes synchronous purpose by the synchronous method in conjunction with the multiple synchronization mode to reach, and has greatly improved synchronous stability and the reliability of Femtocell base station system, 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, and for those of ordinary skills, can be improved according to the above description or conversion, and all these improve 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 a family base station system, is characterized in that, comprises controller, GPS receiver module, receiving element and clock synchronous unit,
Described receiving element is used for the wireless signal of Home eNodeB place environment is intercepted;
Described GPS receiver module is used for receiving gps signal, also is used for synchronous regime and synchronizing quality to controller reporting GPS;
Described clock synchronous unit is used for the Instruction Selection reference synchronization source according to controller, and realizes real-time switching between the multiple synchronization reference source according to the instruction of controller;
Whether described controller is used for determining to use GPS output as reference synchronization according to the synchronous regime of GPS and synchronizing quality, controls the real-time switching of described clock synchronous unit between the multiple synchronization reference source;
Described controller and receiving element are connected with the clock synchronous unit; Described receiving element connects GPS receiver module and clock synchronous unit; Described GPS receiver module connects controller and clock synchronous unit, and described clock synchronous unit arranges synchronous output and clock output;
Described receiving element is intercepted the wireless signal of place, described base station environment, and described controller will disturb minimum available frequency as the operating frequency of oneself; To around the signal of strong frequency carry out demodulation and obtain the frequency departure of local clock and the reference that time synchronized put and send to the unit conduct of described clock synchronous to do corresponding adjustment to frequency deviation and the delivery time of this locality, realize Time and Frequency Synchronization;
Described GPS receiver module is with reference to the output of air interface synchronization, enter fast the locking time service stage, described controller control clock synchronous unit carries out reference and switches action, described base station switches to the GPS synchronous regime from the air interface synchronization state, when the interim losing lock of GPS, system is introduced into the synchronous output of the Holdover mode continuation use GPS of GPS, and the synchronous output quality of monitoring GPS, when the time deviation exceeds the thresholding of system requirements, system is with reference to the output that again switches to air interface synchronization, and continuation monitors the synchronous regime of GPS receiver module.
2. reliable Time and Frequency Synchronization system in family base station system according to claim 1, is characterized in that, described GPS receiver module is provided with the temperature compensating type quartz-crystal resonator, is used to clock synchronous unit clock signal.
3. reliable Time and Frequency Synchronization system in family base station system according to claim 1, is characterized in that, described system also comprises local oscillator, is used to described system that clock signal is provided, and described local oscillator connects the clock synchronous unit.
4. time-frequency synchronization method reliably in a family base station system, is characterized in that, comprises the following 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, otherwise execution in step S3;
The S3:GPS receiver module accelerates the lock that enters of GPS with reference to the output of air interface synchronization, when controller receive the GPS receiver module enter 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, otherwise execution in step S4;
S6: enter the GPS hold mode, and report synchronizing quality to controller, and judge by controller whether synchronizing quality transfinites, if execution in step S7; 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 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 need not the output with reference to air interface synchronization again.
6. reliable time-frequency synchronization method in family base station system according to claim 4, is characterized in that, described synchronizing quality is the synchronous time deviation of GPS.
7. reliable time-frequency synchronization method in family base station system according to claim 4, is characterized in that, described GPS hold mode is that the GPS synchronous regime is continued to keep in the base station.
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| CN103248445B (en) * | 2012-02-09 | 2018-01-05 | 中兴通讯股份有限公司 | A kind of clock synchronizing method and device |
| CN104066166B (en) * | 2013-03-21 | 2018-03-09 | 华为技术有限公司 | A kind of time synchronization method and small base station |
| CN105099647A (en) * | 2014-05-16 | 2015-11-25 | 中兴通讯股份有限公司 | Synchronous method, controller, synchronous node and synchronous network |
| CN104601317B (en) * | 2014-12-31 | 2017-12-26 | 南京大全自动化科技有限公司 | A kind of FPGA Synchronization Clock and its control method |
| 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 |
| CN113568300B (en) * | 2021-09-22 | 2022-01-04 | 深圳心派科技有限公司 | GPS time service method, device, electronic equipment and storage medium |
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| US20110103337A1 (en) * | 2008-05-01 | 2011-05-05 | Roderick Bryant | Gps-based multi-mode synchronization and clocking femto-cells, pico-cells and macro base stations |
| WO2010063127A1 (en) * | 2008-12-03 | 2010-06-10 | Nortel Networks Limited | Multiple redundant gnss synchronization system |
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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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