CN100546216C - Obtain the system and the method thereof of reference clock in the frequency-shift repeater - Google Patents
Obtain the system and the method thereof of reference clock in the frequency-shift repeater Download PDFInfo
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- CN100546216C CN100546216C CNB2005101004015A CN200510100401A CN100546216C CN 100546216 C CN100546216 C CN 100546216C CN B2005101004015 A CNB2005101004015 A CN B2005101004015A CN 200510100401 A CN200510100401 A CN 200510100401A CN 100546216 C CN100546216 C CN 100546216C
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Abstract
The present invention relates to mobile communication technology, system and the method thereof of obtaining reference clock in a kind of frequency-shift repeater are disclosed, extract the information relevant in the base station transmit signals with the base station reference clock, the reference clock of frequency-shift repeater main website and slave station is synchronized on the reference clock that uses the base station, make that the cost of frequency-shift repeater is lower, safeguard convenient.
Description
Technical field
The present invention relates to mobile communication technology, particularly the frequency-shift repeater technology in the mobile communication.
Background technology
In today that mobile communication develops rapidly, the overlay area of which kind of radio communication all will produce weak signal area and blind area, and to some remote districts and the few blind area of number of users, it is too high to set up analog or digital base station cost, infrastructure is also complicated, in this case, just need a kind of cost low, set up simple, the cost-effective equipment that but has the small base station function.Because the repeater can guarantee the network coverage under the prerequisite that does not increase base station number, and its cost is well below the micro cellular system of effect same, so the repeater is to solve a kind of preferred version that mobile communications network extends covering power.Advantages such as that the repeater has been compared with the base station is simple in structure, investment is less and easy for installation can be widely used in the blind area and the weak district that are difficult to cover, improve communication quality, solve problems such as call drop.
The repeater mainly comprises wireless intra-frequency repeater, optical fiber repeater and frequency-shift repeater three classes.Wherein, wireless intra-frequency repeater is subjected to information source to choose restriction with isolation, and along with the increase of base station density, the scope of using in the city is more and more littler; And optical fiber can not arrive in many places, adopts frequency-shift repeater just can well overcome the above problems in this case.In the spacing wave more complicated, and the difficult occasion to obtain of fiber resource, utilize frequency-shift repeater the donor base station signal can be extended covering at a distance, solve the covering that is difficult for laying optical fiber and the seriously polluted area of pilot signal.
Frequency-shift repeater is by adjacent with the base station or with the main website of location with place and need the slave station in the zone that covers to form.Main website obtains downstream signal from base station side, the carrier frequency of the base station that downstream signal is used moves on on another Frequency point and is transmitted to slave station, slave station reverts to the frequency that is moved on the frequency of base station again, thereby has realized main website, the high-isolation of slave station and the wireless link between main website and the slave station; The conversion of upward signal and the transformation classes of downstream signal are seemingly, slave station obtains the upward signal of mobile phone, the carrier frequency of the mobile phone that upward signal is used moves on on another Frequency point and is transmitted to main website, main website reverts to the frequency that is moved on the carrier frequency of mobile phone again, thereby has realized main website, the high-isolation of slave station and the wireless link between main website and the slave station.
The frequency error that the frequency-shift repeater processing signals is brought is embodied in two aspects: the one, and the frequency-shift signaling frequency stability of main website and slave station emission, promptly main website is transmitted to the frequency-shift signaling of slave station and the frequency error of the frequency-shift signaling that slave station is transmitted to main website; Another is the frequency accuracy that main website and slave station shift frequency are handled the back signal, is transmitted to after promptly the signal of base station down is handled through main website and slave station to be transmitted to the signal of base station frequency error after the up signal of signal frequency error, the mobile phone of mobile phone is handled through slave station and main website.
The problem ratio of the frequency-shift signaling frequency stability of main website and slave station emission is easier to solve, and for example requires the tranmitting frequency error of frequency-shift signaling＜± 1 1,000,000/(parts per million is called for short " ppm ").Suppose that shift frequency moves on to 1500MHz by 900 megahertzes (MHz), the upward signal frequency error of the downstream signal of base station and mobile phone emission is 0, to the local frequency stability requirement of main website and slave station is: 1500Hz/ (1500MHz-900MHz)=± 2.5ppm.This requirement is lower comparatively speaking, and the frequency-shift signaling frequency stability ratio of main website and slave station emission is easier to satisfy, and how to keep the frequency accuracy of main website and slave station shift frequency processing back signal especially crucial.
Because there is not the branch of main frame slave in intra-frequency repeater, when therefore signal is through down-conversion and up-conversion, can use same radio-frequency (RF) local oscillator signal, the frequency error of radio-frequency (RF) local oscillator signal is offset in double conversion (down-conversion and up-conversion), does not introduce new frequency error.This process can represent that wherein, fout is the centre frequency of intra-frequency repeater output signal with formula fout=fin-flo+flo=fin, and fin is the centre frequency of intra-frequency repeater input signal, and flo is the local frequency of intra-frequency repeater.
And in frequency-shift repeater, receive and the frequency of emission inequality, and main frame and slave two different places that are placed in, its local oscillation signal can not use same reference signal, this will introduce extra frequency error on master-salve station transmits.
For example, directly put for the shift frequency of downstream signal, the centre frequency of exporting at the main frame place is fout1=fin1-flo11+flo12=fin1+ (flo12-flo11)=fin1+ Δ f
Main, wherein, fin1 is the centre frequency of the downstream signal of main frame reception, and flo11 is the local frequency that the main frame down-conversion is used, and flo12 is the local frequency that the main frame up-conversion is used, Δ f
MainPoor for the local frequency of the local frequency of main frame down-conversion and up-conversion; Centre frequency in the output of slave place is fout2=fout1-flo21+flo22=fout1-(flo21-flo22)=fin1+ Δ f
Main-Δ f
From, wherein, fout1 is that the downstream signal that slave receives is the centre frequency of the downstream signal of main frame transmission, and flo21 is the local frequency that the slave down-conversion is used, and flo22 is the local frequency that the slave up-conversion is used, Δ f
FromPoor for the local frequency of the local frequency of slave down-conversion and up-conversion.As can be seen, on master-salve station transmits, do not introduce extra frequency error, promptly satisfy fin1=fout2, then need to satisfy Δ f if want to realize frequency-shift repeater
Main=Δ f
From, in general, the local oscillation signal of this conditional request principal and subordinate machine uses identical reference clock, promptly satisfies flo22=flo11 and flo12=flo21.
When master-salve station uses different reference clocks, its reference frequency error is not 0 o'clock, the relative difference on frequency of supposing the main website reference clock is a, the relative difference on frequency of slave station reference clock is b, then after the processing of master-salve station, the centre frequency of output signal is fout2=fin1+ (flo12-flo11) * (1-a)-(flo21-flo22) * (1-b)=fin1+ Δ f
Main* (1-a)-Δ f
From* (1-b), promptly the relative difference on frequency of Yin Ruing is (fout2-fin1)/fin1=(Δ f
Main* (1-a)-Δ f
From* (1-b))/fin1.
The order of magnitude of reference frequency relative error of the frequency of supposing master-salve station is the same, and principal and subordinate's frequency error is opposite direction, and then total relative difference on frequency maximum of introducing is (fout2-fin1)/fin1=2*a* Δ f/fin1; The difference on the frequency of supposing shift frequency is fin1, and promptly output frequency is 2 times of incoming frequency, and total frequency error is (fout2-fin1)/fin1=2*a; Suppose that allowing the frequency error of frequency-shift repeater is c, then the requirement of the frequency stability of the reference signal of principal and subordinate repeater is: (2*a* Δ f/fin1)＜=c, i.e. a＜=c*fin1/ (2* Δ f).
Suppose that the shift frequency difference on the frequency is 20MHz, the frequency of base station uplink and downlink signals is in the 900MHz frequency range, and the frequency error of distributing to the repeater is assumed to 0.03ppm.Then the master-salve station reference signal frequency error requirements of frequency-shift repeater gets final product less than 1.125ppm, at this moment, general constant-temperature crystal oscillator (Oven Controlled CrystalOscillator, be called for short " OCXO ") or even all relatively good realizations of temperature controlled crystal oscillator (Temperature Controlled CrystalOscillator is called for short " TCXO ") reference source.
The frequency of actual frequency-shift repeater shift frequency might be far above the frequency of base station uplink and downlink signals, for example the signal shift frequency of 900MHz to 1.5GHz, as seen, reference signal frequency accuracy requirement to frequency-shift repeater is very high, this moment a＜=c*900/ (2*1500), a＜=c*900/ (2*1500), a＜=0.3*c.And common frequency error is 0.05ppm in the wireless communication system, the frequency error of distributing to the repeater is littler, be assumed to 0.03ppm, requirement by above-mentioned example, a＜=0.3*c, the master-salve station reference signal frequency error requirements that is frequency-shift repeater is less than 0.009ppm, and general OCXO reference source also is difficult to satisfy this frequency error.
Therefore for the bigger frequency-shift repeater of shift frequency frequency difference, the frequency error of its reference signal requires height very, even adopt the OCXO of high stability also to be difficult to solve the problem of frequency stability.
In the prior art scheme, the main website of frequency-shift repeater uses different reference clocks respectively with slave station, and is less in the shift frequency frequency shift (FS), when the reference clock frequency stability requirement is hanged down, uses TCXO as the reference clock; Bigger in the shift frequency frequency shift (FS), to the reference clock frequency stability requirement when higher, adopt the higher OCXO of stability as the reference clock and regularly carry out frequency calibration to guarantee the frequency stability of long-term work.
The system of the main website of frequency-shift repeater or slave station forms as shown in Figure 1 in the prior art scheme.
Wherein, duplexer 1 and duplexer 2 are used for a receiving and transmitting signal and a shared antenna; Low noise amplifier 1 and low noise amplifier 2 are used for that the small-signal of input is carried out low noise and amplify; Frequency mixer 1, frequency mixer 2, frequency mixer 3 and frequency mixer 4 are used for the signal and the local oscillation signal of input are carried out mixing, realize the up-conversion of intermediate-freuqncy signal or the down-conversion of high-frequency signal; Intermediate frequency filtering, amplification and gain control module 1 and intermediate frequency filtering, amplification and gain control module 2 are used for the intermediate-freuqncy signal of input is carried out filtering, and the inhibition zone external signal also amplifies and gain controlling; Power amplifier 1 and power amplifier 2 are used for input signal is carried out power amplification to satisfy the requirement of antenna emitted power; Local oscillator 1, local oscillator 2, local oscillator 3 and local oscillator 4 are used for generating the local oscillation signal of certain frequency to be used to carry out up-conversion or down-conversion according to the reference clock of input; Power subsystem is used for providing power supply to other all modules; Reference clock is used to provide the reference clock of local oscillator use; Control unit is used for providing according to received signal and disposition the processing of control signal control system; Radio modem is used for carrying out to received signal demodulation.
Be appreciated that because master-salve station uses different reference clocks, so the shift frequency frequency shift (FS) is higher to the reference clock frequency stability requirement when big the realization more complicated of prior art scheme.For example, with received signal by 800MHz or 900MHz shift frequency during to 1.5GHz, the reference clock that shift frequency is directly put master-salve station inside requires height very, must use the extra high OCXO of stability, and need regular OCXO frequency to calibrate to inside, repeater, for example per 3 months or calibrate the output frequency of an OCXO half a year, to guarantee the frequency accuracy under the long-term work.
In actual applications, there is following problem in such scheme: the prior art scheme needs to use the very high OCXO of stability for the bigger situation of shift frequency frequency shift (FS), and system cost is higher; Simultaneously, also need OCXO is carried out periodic calibration, need extra attendant in order to keep the frequency stability of long-term work, be not easy to safeguard and maintenance cost also higher.
Summary of the invention
In view of this, main purpose of the present invention is to provide system and the method thereof of obtaining reference clock in a kind of frequency-shift repeater, makes that the cost of frequency-shift repeater is lower, safeguards convenient.
For achieving the above object, the invention provides the system that obtains reference clock in a kind of frequency-shift repeater, described frequency-shift repeater comprises main website and slave station, and described main website and slave station also comprise:
The reference signal acquisition module is used to obtain the reference signal synchronous with the reference clock of base station;
Local reference clock generation module is used for generating the reference clock synchronous with it according to the reference signal from described reference signal acquisition module, makes the reference clock of interior local oscillator of main website and slave station and base station synchronous.
Wherein, described reference signal comprises following signal or its frequency division through any type, frequency multiplication and the frequency signal that generates: frequency signal in the base station transmit signals or information source modulation frequency signal.
In this external described system, described main website obtains described reference signal from the downstream signal of described base station; Described slave station obtains described reference signal from transmit, described also process frequency translation the transmitting to the base station transmission frequency that transmits and receive for this slave station.
In this external described system, described reference signal acquisition module uses radio modem to obtain described reference signal, and sends described local reference clock generation module to by the control unit module.
In this external described system, described local reference clock generation module uses automatic frequency control to generate and the synchronous described reference clock of described reference signal.
The present invention also provides the method for obtaining reference clock in a kind of frequency-shift repeater, comprises following steps:
A obtains the reference signal synchronous with the base station reference clock;
B generates and the synchronous reference clock of described reference signal, makes the reference clock of interior local oscillator of the main website of frequency-shift repeater and slave station and base station synchronous.
Wherein, described reference signal comprises: described reference signal comprises following signal or its frequency division through any type, frequency multiplication and the frequency signal that generates: frequency signal in the base station transmit signals or information source modulation frequency signal.
In this external described method, in the described steps A, the main website of described frequency-shift repeater obtains described reference signal from the downstream signal of described base station; The slave station of described frequency-shift repeater obtains described reference signal from transmit, described process frequency translation the transmitting to the base station transmission frequency that transmits and receive for this slave station.
In this external described method, among the described step B, use automatic frequency control to generate and the synchronous described reference clock of described reference signal.The present invention extracts information relevant with the base station reference clock in the base station transmit signals, and the reference clock of frequency-shift repeater main website and slave station is synchronized on the reference clock that uses the base station, has brought comparatively significantly beneficial effect:
At first,, therefore do not need to use high-precision OCXO, can reduce the realization cost of system greatly because the reference clock that the main website of the present invention program's frequency-shift repeater and slave station use is all synchronous with the reference clock that use the base station.
The second, because the reference clock that the main website of frequency-shift repeater and slave station use all with in twice shift frequency of ginseng of base station use is realized error counteracting, do not introduce new frequency error.
The 3rd, because the base station reference clock is generally the high accuracy clock signal, so the present invention program can obtain very high frequency accuracy.
The 4th, because the main website of the present invention program's frequency-shift repeater and the reference clock of slave station can adaptively be adjusted, do not need the attendant periodically to adjust, make attended operation simplify greatly, the corresponding minimizing of maintenance cost.
Description of drawings
Fig. 1 is that the main website of frequency-shift repeater in the prior art scheme or the system of slave station form schematic diagram;
Fig. 2 is that the system of the main website of the frequency-shift repeater of a better embodiment according to the present invention forms;
Fig. 3 is that the system of the slave station of the frequency-shift repeater of a better embodiment according to the present invention forms;
Fig. 4 is the principle schematic of obtaining of the very little frequency error of frequency-shift repeater;
Fig. 5 is a flow process of obtaining the method for reference clock in the frequency-shift repeater of the better embodiment according to the present invention.
Embodiment
Main points of the present invention once are described earlier, the present invention program obtains the reference frequency signal synchronous with the base station reference clock, according to this reference frequency signal the main website of frequency-shift repeater or the reference clock of slave station are synchronized on the reference clock that uses the base station, and the synchronous reference clock of use and base station reference clock generates local oscillation signal and carries out mixing, thereby guarantee equal fully the counteracting of frequency error that main website and slave station shift conversion are introduced, and make the frequency error of main website and slave station and base station keep synchronously to obtain good frequency accuracy with the realization frequency error.
Wherein, the downstream signal that the base station that main website can demodulate reception arrives sends, to use the descending frequency information that transmits that the base station reference clock generates or transmit in information source modulating clock information, thereby obtain and the synchronous reference frequency signal of base station reference clock; That slave station can the demodulation slave station receives and through frequency translation transmitting to the base station transmission frequency, to use the descending frequency information that transmits that the base station reference clock generates or transmit in information source modulating clock information, thereby obtain and the synchronous reference frequency signal of base station reference clock.
For realize with the base station reference clock synchronously, can utilize that automatic frequency control (AutoFrequency Control is called for short " AFC ") makes that the reference clock of main website or slave station is synchronized to that demodulation obtains with the synchronous reference frequency signal of base station reference clock on.)
The present invention program make the purpose, technical solutions and advantages of the present invention clearer for better illustrating, the present invention is described in further detail below in conjunction with accompanying drawing.
The set of systems of the main website of the frequency-shift repeater of a better embodiment and slave station becomes respectively as shown in Figures 2 and 3 according to the present invention.Wherein, reference signal is the described reference frequency signal of preamble.
Compare with the master-salve station of the frequency-shift repeater of prior art, the main distinction of the system of the master-salve station of the frequency-shift repeater of a better embodiment of the present invention is: radio modem module, control unit module and reference clock module.
In better embodiment of the present invention, these three modules of radio modem module, control unit module and reference clock module have been formed the reference clock in the frequency-shift repeater jointly and have been obtained system.
Wherein, the radio modem module is used to obtain the reference signal synchronous with the base station reference clock, and it is passed to the control unit module.In better embodiment of the present invention, for main website, this reference signal can be obtained in the downlink signal of the base station that receives; For slave station, that this reference signal can receive at slave station and in the transmitting of base station transmission frequency, obtain through frequency translation.With the synchronous reference signal of base station reference clock can be the frequency signal or the information source modulation frequency signal of base station transmit signals, these two signals are respectively modulation signal and modulated signals, in addition, the frequency signal of base station transmit signals, information source modulation frequency signal also can be used as reference signal through the optional frequency signal that the frequency division frequency multiplication generates, the reference clock that they all are based on the base station generates, and all is synchronized with the reference clock of base station.Need to prove that though in better embodiment of the present invention, obtaining by the radio modem module of reference signal realizes, when specific implementation, also can realize by wireless receiver.
The control unit module passes to the reference clock module with the reference signal that receives.Wherein, reference signal provides the frequency information synchronous with the reference clock of base station.
The reference clock module is used for generating the reference clock that is synchronized with this reference signal according to the reference signal that receives.Can use AFC that reference clock is synchronized on the reference signal.Wherein, AFC can realize negative feedback according to the identification result of phase difference, thereby realizes the adaptive tracing for the frequency of reference signal.In better embodiment of the present invention, the reference signal of input reference clock module is synchronized with the reference clock of base station, therefore the reference clock module can be used the frequency of AFC output frequency adaptive tracing reference signal, also promptly is synchronized with the clock signal of the reference clock of base station.
Among the present invention program, frequency-shift repeater obtains that very the principle of small frequency errors can be as shown in Figure 4.Wherein, f1 is the frequency of the downlink signal of base station, and f5 is the frequency that transmit of the also process frequency translation of slave station reception to the base station transmission frequency.Draw easily:
f4＝f1+f3
＝f1+f1×N2/N1
＝f1×(1+N2/N1)............(1)
f5＝f4-f3
＝f1×(1+N2/N1)-f5×N4/N3............(2)
Make N4/N3=N2/N1, then comprehensively (1) and (2) gets:
f5＝f1×(1+N2/N1)-f5×N4/N3.........(3)
F5 solved an equation to (3) as unknown number get final product: f5=f1.
Promptly because the reference clock of the main website of frequency-shift repeater and slave station all is synchronized with the reference clock of base station, therefore the local oscillator in main website and the slave station is all synchronously on the reference clock of base station, this just makes the Frequency Synchronization of frequency-shift repeater forward signal on the frequency that base station down transmits, it is consistent with the base station that frequency keeps, can eliminate frequency error in theory, in the practical application, though because some nonideal situations, frequency error can not be eliminated fully, but can reduce to very little.
Obtain in the frequency-shift repeater of a better embodiment according to the present invention reference clock method flow process as shown in Figure 5.
At first enter step 510, obtain the reference frequency signal synchronous with the base station reference clock.Wherein, with the synchronous reference signal of base station reference clock can be the frequency signal or the information source modulation frequency signal of base station transmit signals, these two signals are respectively modulation signal and modulated signals, in addition, the frequency signal of base station transmit signals, information source modulation frequency signal also can be used as reference signal through the optional frequency signal that the frequency division frequency multiplication generates, the reference clock that they all are based on the base station generates, and all is synchronized with the reference clock of base station.In better embodiment of the present invention, for main website, this reference signal can be obtained in the downlink signal of the base station that receives; For slave station, that this reference signal can receive at slave station and in the transmitting of base station transmission frequency, obtain through frequency translation.
Then enter step 520, generate the reference clock that use synchronous with it this locality according to reference frequency signal.Can utilize AFC that the local reference clock that uses is synchronized on the reference frequency signal.Wherein, AFC can realize negative feedback according to the identification result of phase difference, thereby realizes the adaptive tracing for the frequency of reference signal.
Pass through above-mentioned steps, the main website of frequency-shift repeater and the reference clock of slave station all are synchronized with the reference clock of base station, thereby make that the local oscillator in main website and the slave station is all synchronous on the reference clock of base station, this just makes the Frequency Synchronization of frequency-shift repeater forward signal on the frequency that base station down transmits, it is consistent with the base station that frequency error keeps, can obtain to eliminate frequency error in theory, in the practical application, because some nonideal situations, frequency error can not be eliminated fully, but very little frequency error can be obtained.
Though, the present invention is illustrated and describes by with reference to some of the preferred embodiment of the invention, be interpreted as, can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (9)
1. obtain the system of reference clock in the frequency-shift repeater, described frequency-shift repeater comprises main website and slave station, it is characterized in that, described main website and slave station also comprise:
The reference signal acquisition module is used to obtain the reference signal synchronous with the reference clock of base station;
Local reference clock generation module is used for generating the reference clock synchronous with it according to the reference signal from described reference signal acquisition module, makes the reference clock of interior local oscillator of main website and slave station and base station synchronous.
2. obtain the system of reference clock in the frequency-shift repeater according to claim 1, it is characterized in that described reference signal comprises following signal or its frequency division through any type, frequency multiplication and the frequency signal that generates: frequency signal in the base station transmit signals or information source modulation frequency signal.
3. obtain the system of reference clock in the frequency-shift repeater according to claim 1, it is characterized in that, described main website obtains described reference signal from the downstream signal of described base station; Described slave station obtains described reference signal from transmit, described also process frequency translation the transmitting to the base station transmission frequency that transmits and receive for this slave station.
4. obtain the system of reference clock in the frequency-shift repeater according to claim 1, it is characterized in that, described reference signal acquisition module uses radio modem to obtain described reference signal, and sends described local reference clock generation module to by the control unit module.
5. according to the system that obtains reference clock in each described frequency-shift repeater in the claim 1 to 4, it is characterized in that described local reference clock generation module uses automatic frequency control to generate and the synchronous described reference clock of described reference signal.
6. obtain the method for reference clock in the frequency-shift repeater, it is characterized in that, comprise following steps:
A obtains the reference signal synchronous with the base station reference clock;
B generates and the synchronous reference clock of described reference signal, makes the reference clock of interior local oscillator of the main website of frequency-shift repeater and slave station and base station synchronous.
7. obtain the method for reference clock in the frequency-shift repeater according to claim 6, it is characterized in that described reference signal comprises following signal or its frequency division through any type, frequency multiplication and the frequency signal that generates: frequency signal in the base station transmit signals or information source modulation frequency signal.
8. obtain the method for reference clock in the frequency-shift repeater according to claim 6, it is characterized in that, in the described steps A, the main website of described frequency-shift repeater obtains described reference signal from the downstream signal of described base station; The slave station of described frequency-shift repeater obtains described reference signal from transmit, described process frequency translation the transmitting to the base station transmission frequency that transmits and receive for this slave station.
9. according to the method for obtaining reference clock in each described frequency-shift repeater in the claim 6 to 8, it is characterized in that, among the described step B, use automatic frequency control to generate and the synchronous described reference clock of described reference signal.
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| CN101257339B (en) * | 2007-03-01 | 2013-03-20 | 华为技术有限公司 | Broadcasting network and small power base station |
| CN101047435B (en) * | 2007-04-30 | 2010-08-18 | 武汉虹信通信技术有限责任公司 | Method for holding switch point position when TD-SCDMA repeater nonsynchronous with target base station |
| CN101047436B (en) * | 2007-04-30 | 2010-04-14 | 武汉虹信通信技术有限责任公司 | Characteristic window capture synchronous and GPS synchronous adaptive selection method in TD-SCDMA repeater |
| CN101884243B (en) * | 2007-11-21 | 2013-04-17 | 朗讯科技公司 | CDMA base station and signal processing method used therein |
| CN101299631B (en) * | 2008-06-24 | 2012-05-23 | 芯通科技（成都）有限公司 | Method and system for implementing stabilization synchronism of TD-SCDMA directly-discharging station |
| CN111565450B (en) * | 2020-01-14 | 2022-05-17 | 深圳国人无线通信有限公司 | Method and system for self-adaptively adjusting time delay of base station |
| CN114401521A (en) * | 2021-12-16 | 2022-04-26 | 北京唯得科技有限公司 | Variable frequency communication transmission method and transmission system |
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