CN1756123A - System and method for realizing base station time synchronism - Google Patents
System and method for realizing base station time synchronism Download PDFInfo
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- CN1756123A CN1756123A CN 200410080388 CN200410080388A CN1756123A CN 1756123 A CN1756123 A CN 1756123A CN 200410080388 CN200410080388 CN 200410080388 CN 200410080388 A CN200410080388 A CN 200410080388A CN 1756123 A CN1756123 A CN 1756123A
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Abstract
The invention discloses a system for realizing the time synchronization of base station (BTS), comprising a BTS; a time emitting station for generating the clock information, encoding and modulating the time-encoded clock information and itself position information to get the wireless information to be transmitted; a time receiving module for receiving the wireless signal of time emitting station, demodulating and decoding the wireless signal to get the clock information and the position information of time emitting station, while processing the time-decoding on the attained clock information to get the absolute clock information, and according the position information and absolute clock information of said time emitting station to calculate the present clock information to be transmitted to the BTS. The invention also discloses a method for realizing the time synchronization and with The invention the time synchronization of BTS can be realized with lower cost.
Description
Technical field
The present invention relates to the Time synchronization technique of mobile communcations system, particularly realize the system and method for base station (BTS) time synchronized in the mobile communcations system.
Background technology
At present, code division multiple access (CDMA), CDMA 2000 and CDMA 1X system have obtained in the whole world to use widely.This system adopts synchronous CDMA (Code Division Multiple Access), requires therefore that the time keeps synchronously between numerous BTS, and requires synchronous precision very high, at least in microsecond (μ s) magnitude.Existing solution mainly is to adopt navigation system, as the Galileo system in the global positioning system of the U.S. (GPS), GLONASS (Global Navigation Satellite System) (GLONASS) or Europe etc., finishes the time synchronized of BTS.
Fig. 1 is the composition schematic diagram of existing realization base station clock synchronization system.As shown in Figure 1, this system comprises: navigation system satellite 120, satellite receiver 130 and BTS 140.Wherein, navigation system satellite 120 and BTS 140 have a plurality of, on each BTS 140 satellite receiver 130 are installed.Navigation system satellite 120 is used to launch the satellite-signal that comprises precision clock information; Satellite receiver 130 is used to receive the signal of a plurality of satellites, by phase place or the time delay information of measuring each satellite-signal, obtains precise time information thereby carry out tight location calibration; BTS 140, obtain accurate clock information from the satellite receiver 130 of self installing.
Because, atomic clock all is installed in the satellite of navigation system, can be steady in a long-term precision clock information is provided, the time between each satellite can be kept synchronously, therefore, each BTS can obtain synchronous temporal information by receiving satellite signal.In order to guarantee time precise synchronization between the different B TS, each BTS has installed satellite receiver among Fig. 1, like this, causes the realization cost of BTS too high.
On the other hand, the time synchronized of BTS depends on the temporal information of satellites transmits, and this also will bring potential safety hazard.Such as: unusual if the GSP system occurs, a certain area does not receive gps signal, and then the cdma wireless communication system of this area will be because of can not time synchronized and the whole network paralysis.Therefore, some national requirements are at present installed the satellite receiver of compatible with GPS and GLONASS to guarantee Cybersecurity Operation, have so more increased the complexity and the cost of cdma system.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of system of the BTS of realization time synchronized, can and realize the time synchronized between the BTS in the mobile communcations system more easily with low cost.
Another object of the present invention is to provide a kind of method of the BTS of realization time synchronized, can save the construction cost of BTS greatly, and can realize the precise synchronization of BTS time easily.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of system of the BTS of realization time synchronized, comprise, BTS, this system also comprises:
Time the cell site, be used to produce clock information, the positional information of the clock information after the time encoding and self is encoded, is modulated, obtain wireless signal and emission;
The time receiver module, the wireless signal that is used for the time of reception cell site, to wireless signal carry out demodulation, the decoding obtain clock information and the time cell site positional information, resulting clock information is carried out time decoder obtains absolute clock information, and according to this time the cell site positional information, absolute clock information calculations obtain present clock information and be sent to BTS.
Wherein, this system comprises one or more cell site described time; Described time receiver module receives the wireless signal of cell site of described one or more time and obtains present clock information according to these wireless signals.
Wherein, the cell site comprises described time:
The time generation module is used to produce clock information and exports the time encoding module to;
The time encoding module is used for clock information is carried out time encoding and exports the wireless signal transmission unit to;
The wireless signal transmission unit, be used for the clock information after the time encoding and the time cell site positional information coding, be modulated into wireless signal and emission.
Wherein, described time generation module is an atomic clock.
Wherein, described time generation module is a satellite receiver; Described satellite receiver is from navigation system satellite receiving satellite signal and produce clock information.
Wherein, further comprise atomic clock in the described time generation module; Described time encoding module receives clock information that satellite receiver or atomic clock the produce line time coding of going forward side by side.
Wherein, described wireless signal transmission unit comprises:
Transmitting set, be used for the clock information after the time encoding and the time cell site positional information coding, be modulated into wireless signal, wireless signal is carried out sending into transmitting antenna after the power amplification;
Transmitting antenna is used for wireless signal transmission to aerial.
Wherein, described time receiver module comprises:
The wireless signal receiving element is used for carrying out demodulation, decoding from aerial reception wireless signal, with obtain the described time cell site positional information export the time processing module to, export the clock information that obtains to the time decoder module;
The time decoder module is carried out time decoder to the clock information that receives and is obtained absolute clock information and export the time processing module to;
The time processing module, be used for according to the time cell site positional information and absolute clock information calculations obtain present clock information and export BTS to.
Wherein, described time processing module comprises:
Data processing unit (MCU) is used for calculating present clock information and exporting the time output module to according to described positional information and absolute clock information;
The time output module is used to receive present clock information and exports BTS to.
Wherein, described time receiver module comprises:
The wireless signal receiving element is used for carrying out demodulation, decoding from aerial reception wireless signal, with the clock information that obtains and the described time cell site positional information, and export the time processing module to;
The time decoder module is carried out time decoder to the clock information that receives and is obtained absolute clock information and export the time processing module to;
The time processing module, be used to receive from the clock information of wireless signal receiving element and export the time decoder module to, receive absolute clock information from the time decoder module, and according to the time cell site positional information and this absolute clock information calculations obtain present clock information and export BTS to.
Wherein, described time processing module comprises:
MCU, be used for from wireless signal receiving element receive clock information and export the time decoder module to, receive absolute clock information from the time decoder module, calculate present clock information and export the time output module to according to described positional information and absolute clock information;
The time output module is used to receive present clock information and exports BTS to.
Wherein, described wireless signal receiving element comprises:
Reception antenna is used for from aerial reception wireless signal and exports wireless receiver to;
Wireless receiver, positional information that be used to decode, the demodulation wireless signal obtains cell site of described time and clock information and output.
The invention also discloses a kind of method of the BTS of realization time synchronized, employing comprises: BTS, time the cell site and the system of time receiver module realize that this method also comprises:
A. the cell site produces clock information and it is carried out time encoding the time, with self positional information and the coding of the clock information after the time encoding, be modulated into wireless signal and launch;
B. the wireless signal of time receiver module time of reception cell site emission, to wireless signal carry out demodulation, the decoding obtain clock information and the time cell site positional information, described clock information is carried out time decoder obtains absolute clock information, and according to this time the cell site positional information, absolute clock information calculations obtain the BTS that present clock information is sent to self place.
Among the step a, the method for described generation clock information is: cell site self produces clock information by the time.
Among the step a, the method for described generation clock information is: the time, the cell site received the satellite-signal of navigation system satellite, produced clock information according to this satellite-signal.
Among the step a, the method for described generation clock information is: the time, the cell site received the satellite-signal generation clock information of navigation system satellite, and self produces clock information simultaneously; Described clock information is carried out further comprising before the time encoding: judged whether described satellite-signal, if having, the clock information that receiving satellite signal produces; Otherwise receive the clock information that self produces.
Wherein, set in advance the clock information fixed delay of time cell site; Among the step a, described when carrying out time encoding, the clock information that is produced is added the clock information fixed delay of this cell site obtains new clock information time, again this new clock information is carried out time encoding.
Wherein, set in advance the clock information fixed delay of time receiver module; Among the step b, described when calculating present clock information, add this clock information fixed delay and calculate.
Wherein, the positional information of pre-configured self place BTS in the described time receiver module; Among the step b, the time receiver module receive one the time cell site wireless signal, the positional information calculation of positional information, absolute clock information and this BTS of cell site obtains present clock information time according to this.
Among the step b, described time receiver module receive one the above time cell site wireless signal, according to the positional information and the delay inequality of each the time cell site's absolute clock information positional information that obtains receiver module place BTS of described time of these cell site a plurality of times, again according to one of them time the cell site positional information and the positional information calculation of absolute clock information and this BTS obtain present clock information.
By such scheme as can be seen, key of the present invention is: be provided with in system and be specifically designed to the time cell site that emission comprises the wireless signal of clock information, the time receiver module is set among each BTS, and each time receiver module obtains current precision clock information and imports the BTS at place separately according to the wireless signal of the time cell site's emission that receives.
Therefore, the system and method for realization BTS time synchronized provided by the present invention, can reduce the construction cost of BTS greatly, and guarantee that each BTS obtains the clock information that is accurate to μ s magnitude by the time receiver module, thereby realize the time synchronized between each BTS in the cdma system.
Description of drawings
Fig. 1 is the composition schematic diagram of existing realization BTS clock synchronization system;
Fig. 2 is the composition structural representation of system of the present invention one preferred embodiment;
Fig. 3 is the inventive method one preferred embodiment handling process schematic diagram.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The invention discloses a kind of system of the BTS of realization time synchronized, comprise, BTS; The time cell site also is set in this system specially, is used to launch the wireless signal that comprises clock information; The time receiver module is set among each BTS, and each time receiver module calculates current precision clock information and imports the BTS at place separately according to the wireless signal of the time cell site's emission that receives, thereby realizes the time synchronized of each BTS in the cdma system.
Fig. 2 is the composition structural representation of system of the present invention one preferred embodiment.Comprise in the system shown in Figure 2: the time cell site 210 and be provided with the BTS 200 of time receiver module 220.The described time, the cell site 210 comprised: time generation module 211, time encoding module 212, wireless signal transmission unit 213; Described wireless signal transmission unit 213 comprises: transmitting antenna 213A and transmitting set 213B.Described time receiver module 220 comprises: wireless signal receiving element 221, time decoder module 222 and time processing module 223; Described wireless signal receiving element 221 comprises: reception antenna 221A, wireless receiver 221B; Described time processing module 223 comprises: MCU 223A and time output module 223B.
The annexation of cell site's 210 internal structure of described time and each several part is as follows:
Wherein, described time generation module 211 is used to produce clock information and exports time encoding module 212 to; This time generation module 211 comprises: satellite receiver 211A and atomic clock 211B; Satellite receiver 211A is from navigation system satellite 230 receiving satellite signals and produce clock information; Atomic clock 211B, self directly produces precision clock information.Time encoding module 212 from satellite receiver 211A or atomic clock 211B receive clock information, is carried out time encoding to clock information and is converted into digital coding and output; Transmitting set 213B, reception is from the digital coding of the clock information of time encoding module 212, and simultaneously with information and this clock information codings such as self-position of time cell site emission, be modulated into wireless signal, wireless signal is carried out mixing sends into transmitting antenna 213A after with its power amplification; Transmitting antenna 213A arrives the wireless signal transmission that receives aerial.
Here, time generation module 211 also can be realized by satellite receiver 211A or atomic clock 211B separately.Because the cost of satellite receiver is lower than atomic clock, therefore adopt satellite receiver to be easy to most popularize as the time generation module, but, if abnormal conditions appear in navigation system, satellite receiver can't obtain satellite-signal and produce clock information, thereby cause the whole network paralysis.Therefore, consideration for network security, time generation module 211 in the present embodiment comprises simultaneously: satellite receiver 211A and atomic clock 211B, when satellite receiver 211A operate as normal, time encoding module 212 receives the clock information of satellite receiver 211A, occurs when unusual at satellite receiver 211A, and time encoding module 212 is from atomic clock 211B receive clock information, thereby under any circumstance all can guarantee the output of precision clock information, make Cybersecurity Operation.
The internal structure of described time receiver module 220 and the annexation of each several part are as follows:
Wherein, reception antenna 221A is used for from aerial reception wireless signal and exports wireless receiver 221B to; Wireless receiver 221B is used for wireless signal is carried out demodulation, decoding, with the digital coding of the clock information that obtains and the time cell site positional information export time decoder module 222 and MCU 223A respectively to; Time decoder module 222 is used for obtaining absolute clock information and exporting MCU 223A to carry out time decoder from the digital coding of the clock information of wireless receiver 221B; MCU223A, be used for by send instruction to wireless receiver 221B and time decoder module 222 control wireless receiver 221B and time decoder module 221C output position information and absolute clock information etc. to MCU 223A, and according to the time cell site positional information and absolute clock information calculate present clock information and export time output module 223B to; Time output module 223B is used for exporting present clock information to BTS 200.
Here, wireless receiver 221B also can with the clock information that obtains and the time cell site positional information all be sent to MCU 223A, realize the control of all data input and output by MCU 223A, the clock information that receives is sent to time decoder module 222, and carries out the described current precision clock information that calculates from the absolute time information of decoder module 222 reception elapsed time decodings.
Among the present invention; wireless receiver 221B mainly is responsible for wireless signal is decoded; the clock information that demodulation obtains comprising in the wireless signal and the time cell site positional information; MCU 223A mainly obtains current precision clock information according to absolute clock information and time cell site's positional information and calculates; time decoder module 222 main being responsible for are carried out time decoder to digitally coded clock information; working method between this three and annexation have multiple; be not limited only to above-described two kinds of schemes; the present invention does not limit, but all within its protection range.
Because, time receiver module 220 receive the time cell site 210 obtained clock information the time, the wireless signal that comprises this clock information has produced certain time delay with current clock information through the transmission of the space of long distance, then described clock information is called as absolute clock information, and it can not represent current precision clock information.Therefore, time receiver module 220 must position the BTS 200 at self place, positional information according to the positional information of BTS 200 and the clock cell site 210 that receives obtains the propagation delay time of described absolute clock information in the space, thereby obtains current accurate clock information.Here, described BTS 200 and clock cell site 210 positional informations are the absolute coordinate positional information.
By geometrical principle as can be known, article two, straight line can be determined in same plane the coordinate position of a bit, BTS and the time cell site compare comparatively dense, the zone that normal throw is little, as: in the city, close together between BTS and the time cell site, and the normal throw between them is generally within 500 meters, therefore, can not consider the vertical range between BTS and the time cell site, just set BTS and the time cell site be in same horizontal plane, in the system then shown in Figure 2, also comprise another cell site 210 ' time, time receiver module 220 among the BTS 200 just can be determined the position of BTS 200 by the wireless signal that receives two clock cell sites, thereby obtains present clock information.In the described time cell site 210 ' annexation of each several part with form structure and the time cell site 210 identical, detailed description no longer here.
The present invention also can be in described time receiver module 210 positional information of pre-configured place BTS 200, then only receive one the time cell site wireless signal just can obtain precision clock information; Wherein, for the method for time receiver module configuration place BTS positional information has multiplely, belong to known technology: can interim satellite receiver obtains the BTS current position information by receiving satellite signal and the time receiver module that imports on this BTS is preserved connecting on the BTS; Also can locate this BTS, and positional information is imported this time receiver module by radar; Concrete which kind of method that adopts does not influence validity of the present invention.
System of the present invention also can be applied to the bigger zone of normal throw, then the time receiver module need receive at least three the time cell site wireless signal determine the positional information of place BTS, thereby obtain precise time.Here, receive the wireless signal of cell site of several times about concrete time receiver module, the present invention does not limit.
Based on the system of above-mentioned realization BTS time synchronized, realize that to using system of the present invention the method for BTS time synchronized is described in detail below in conjunction with Fig. 3.Fig. 3 is the inventive method one preferred embodiment handling process schematic diagram.In the present embodiment, the time receiver module that is arranged among the BTS does not have allocation position information, needs the wireless signal of two time of reception cell site to obtain precision clock information.Concrete treatment step is as follows:
Step 301: the satellite receiver in the time cell site receives the satellite-signal of navigation system satellite, obtains wherein accurate clock information.Here, described satellite receiver can be satellite receiver such as GPS, markon's summary or GLONASS.
Step 302: the precision clock information that step 301 is obtained is carried out time encoding.
Wherein, clock information is carried out time encoding by the time encoding module in the time cell site, such as: the time encoding that the current decimal system is expressed is binary digital coding.
Step 303: the time transmitting set of cell site is encoded, is modulated the positional information of self and the digital coding of the described clock information of step 302, obtains wireless signal.
Step 304: the described transmitting set of step 303 carries out mixing to wireless signal, and with the power amplification of wireless signal, the transmission antennas transmit of passing through the time cell site again is to aerial.
The wireless signal of being launched in the reception antenna receiving step 304 of set time receiver module among the step 305:BTS, by wherein wireless receiver to wireless signal carry out demodulation, decoding obtains the positional information of cell site of described time of step 303 and the digital coding of clock information, the positional information of cell site is sent into MCU with the time, the digital coding of clock information is directly sent into the time decoder module or sent into the time decoder module by MCU, carry out time decoder by the time decoder module and obtain and the described identical clock information of step 301.
Here, because the time receiver module received when the time, the cell site was with the clock information that obtained, the wireless signal that comprises clock information has produced certain time delay with current clock information through the propagation of long distance, therefore described clock information is called as absolute clock information, that is: this clock information is only represented step 301 clock information at that time, is not current precision clock information.
Step 306: the wireless signal that the reception antenna of time receiver module and wireless receiver also receive another cell site simultaneously time carries out demodulation, decoding to it and obtains the positional information of another cell site and the digital coding of clock information time, the positional information of cell site is sent into MCU time with another, with the digital coding of this another time cell site's clock information set by step 305 described modes send into the time decoder module, carry out the clock information of time decoder when obtaining this another time, the cell site sending wireless signal by the time decoder module.MCU from the time decoder module receive through decoding two the time cell site absolute clock information, according to this two the time cell site positional information and two the time cell site clock information between delay inequality, can obtain the positional information of place BTS.
Present embodiment is suitable for the zone that BTS is intensive and normal throw is little, each BTS and the time cell site can think and be in same horizontal plane, therefore can according to two the time cell site wireless signal BTS is positioned and obtains precision clock information.Wherein, the method for described location BTS has multiple, as: measure the received signal power positioning mode, measure received signal direction positioning mode, measure received signal propagation time difference positioning mode or the like.Present cdma system Time synchronization technique adopts more measures received signal propagation time difference positioning mode, be example below with the method, the method that obtains the BTS positional information is illustrated: since two the time cell site not necessarily identical with the distance of BTS, therefore receive simultaneously two the time cell site wireless signal the time, the clock information that comprises in its wireless signal is not necessarily identical, therefore certainly exist delay inequality between two wireless signals, according to this delay inequality and each time the cell site the position can calculate the positional information of BTS, measure received signal propagation time difference location if adopt " hyperbolic fix method ", then the time receiver module on this BTS also to receive the 3rd the time cell site wireless signal, carry out the positional information that correlation computations obtains BTS.The method of above-mentioned location BTS, and the concrete calculating of the whole bag of tricks design belongs to known technology, is not described in further detail here.
Above-mentioned steps 305 is independently handled mutually with step 306 symbolic animal of the birth year, can executed in parallel, and the present invention does not limit the sequencing of its execution.
Step 307: obtain in the positional information of the BTS that described MCU obtains according to step 306 and the step 305 time the cell site positional information, obtain the distance between BTS and the described time cell site, calculate this cell site to the transmission of wireless signals time delay of BTS time, thereby with the described absolute clock information of step 305 therewith the propagation delay time addition obtain current accurate clock information, and export to BTS, make BTS can access the clock information that is accurate to the following magnitude of μ s, satisfy the requirement of each BTS time synchronized in the cdma system.Here, the air transfer rate of wireless signal is a given value, if set: the transmission rate of wireless signal is C, BTS and the time cell site distance be L, the propagation delay time T ' between BTS and the time cell site, then T '=L/C.
In this step, only consider the aerial propagation delay time of wireless signal, do not consider clock information the time cell site and time receiver module inside handle the time delay that is produced.Because the time synchronized of BTS requires clock information to be accurate to μ s magnitude, also will the seeking time cell site and the speed of time receiver module deal with data at million grades, the disposal ability of present electronic equipment is easy to reach this speed, therefore, the time delay that under the enough situation of device processes ability, can ignore this internal clocking information flow.
But, in order accurately to guarantee the time synchronized of BTS, can according to the specific implementation situation of system respectively to the time cell site and the time delay of the clock information of time receiver module accurately estimate, the fixed delay that obtains clock information be configured in the time cell site and the time receiver module in.Then in step 302, time, the cell site carried out before the time encoding the accurate clock information of clock information fixed delay when obtaining expecting that the cell site exports from the time with the described clock information addition of step 301 with the time cell site to clock information, and then this clock information is carried out time encoding; In the step 307, MCU obtains finally the temporal information fixed delay addition of the absolute clock information that receives and described propagation delay time and time receiver module accurately that clock information exports BTS to by the time output module.
Here, the clock information fixed delay of cell site of described time is: produce clock information since the time generation module, this clock information begins to launch the time delay that is produced till the wireless signal that comprises this clock information through time encoding module, transmitting set transmission and processing up to transmitting antenna; The clock information fixed delay of described time receiver module is: receive the wireless signal that comprises clock information from reception antenna, this clock information is exported the time delay that is produced till this clock information through wireless receiver, time decoder module, MCU transmission and processing up to the time output module.
In the such scheme, the receiver reception via satellite of time cell site comprises the satellite-signal of clock information, but consider the problem of network security, prevent because the network paralysis that the satellite-signal interruption causes, can also dispose atomic clock in the time cell site and continue output precision clock information, because the navigation system satellite also is the atomic clock generation clock information by self, therefore the clock information that produces by atomic clock is identical with the clock information accuracy that signal via satellite obtains, and can satisfy cdma system BTS time synchronized needs.
In addition, can also adopt flexible way to produce clock information, dispose atomic clock and satellite receiver simultaneously in the time cell site, atomic clock and satellite receiver continue the output clock information to the time encoding module simultaneously.In the step 302, the time decoder module judges at first that when receive clock information whether satellite receiver has the signal input, if having, then receives the clock information of satellite receiver; Otherwise receive the clock information of atomic clock.Like this, under the normal situation of satellite-signal, signal obtains clock information via satellite, when satellite-signal interrupts, can't influence the time synchronized of the BTS of system, the time cell site then receive the clock information that atomic clock produces and carry out time synchronized, thereby guarantee Cybersecurity Operation.
When the present invention is applied to the bigger zone of normal throw, then need to consider the position coordinates of each BTS and time cell site's three-dimensional.According to geometrical principle, in the middle of three dimensions, the coordinate of any can be determined in three planes equally.Therefore, the time receiver module of BTS need receive at least three the time cell site wireless signal calculate the positional information of BTS.In the then described step 306, the time receiver module receives the wireless signal of two other cell site simultaneously time, and MCU is by similarly calculating the positional information of this BTS, thereby obtains the distance between this BTS and described time of step 301 cell site.If adopt " hyperboloid positioning mode " to locate this BTS, then the time receiver module on this BTS to receive four the time cell site wireless signal, carry out the positional information that correlation computations obtains BTS.About concrete computational process, be not described further here.
The positional information of BTS that received in the middle of the module configured in advance at that time, so according to the positional information of BTS and receive one the time cell site positional information can between obtain distance between them, then only receive one the time cell site wireless signal just can obtain precision clock information, at this moment, described step 306 needn't be carried out, and can realize the time synchronized of BTS equally.
In addition, above-mentioned Figure 3 shows that at one the moment from the time cell site obtain clock information and receive module then and receive the handling process that wireless signal obtains precision clock information output BTS, BTS inside also is provided with clock, but it is accurate to can not show a candle to atomic clock, to calibrate the clock of self according to the precision clock information that receives every several seconds BTS, therefore the present invention will continue periodically to carry out this handling process, and the cycle of common described BTS clock alignment, the present invention did not limit in level second.In addition, receive the scheme of cell site's wireless signal of above time for needs, then in the initial processing cycle, need execution in step 306 to obtain the positional information of BTS, after the positional information of having obtained BTS, needn't execution in step 306 in the then later processing, the time receiver module only receive one the time cell site wireless signal, the propagation delay time according to wireless signal between BTS that has calculated and the time cell site just can obtain accurate clock information.
In sum, use system and method for the present invention, can be with low cost construction BTS, and can satisfy the requirement of BTS time synchronized in the cdma system, make each BTS receive the precision clock information of μ s magnitude.In addition, the present invention also considers the problem of network security, when the time of system cell site's receiving satellite signal produces clock information, also the atomic clock by self produces clock information, like this, when satellite-signal interrupted, the clock information that system can adopt atomic clock to produce was finished the time synchronized of BTS.Therefore, the present invention not only can realize the time synchronized of BTS with low cost, has also guaranteed the safe operation of system.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in of the present invention comprising in the scope.
Claims (20)
1, a kind of system that realizes the base station BTS time synchronized comprises, BTS is characterized in that, this system also comprises:
Time the cell site, be used to produce clock information, the positional information of the clock information after the time encoding and self is encoded, is modulated, obtain wireless signal and emission;
The time receiver module, the wireless signal that is used for the time of reception cell site, to wireless signal carry out demodulation, the decoding obtain clock information and the time cell site positional information, resulting clock information is carried out time decoder obtains absolute clock information, and according to this time the cell site positional information, absolute clock information calculations obtain present clock information and be sent to BTS.
2, system according to claim 1 is characterized in that, this system comprises one or more cell site described time; Described time receiver module receives the wireless signal of cell site of described one or more time and obtains present clock information according to these wireless signals.
3, system according to claim 1 is characterized in that, the described time, the cell site comprised:
The time generation module is used to produce clock information and exports the time encoding module to;
The time encoding module is used for clock information is carried out time encoding and exports the wireless signal transmission unit to;
The wireless signal transmission unit, be used for the clock information after the time encoding and the time cell site positional information coding, be modulated into wireless signal and emission.
4, system according to claim 3 is characterized in that, described time generation module is an atomic clock.
5, system according to claim 3 is characterized in that, described time generation module is a satellite receiver; Described satellite receiver is from navigation system satellite receiving satellite signal and produce clock information.
6, system according to claim 5 is characterized in that, further comprises atomic clock in the described time generation module; Described time encoding module receives clock information that satellite receiver or atomic clock the produce line time coding of going forward side by side.
According to each described system of claim 3 to 6, it is characterized in that 7, described wireless signal transmission unit comprises:
Transmitting set, be used for the clock information after the time encoding and the time cell site positional information coding, be modulated into wireless signal, wireless signal is carried out sending into transmitting antenna after the power amplification;
Transmitting antenna is used for wireless signal transmission to aerial.
8, system according to claim 1 is characterized in that, described time receiver module comprises:
The wireless signal receiving element is used for carrying out demodulation, decoding from aerial reception wireless signal, with obtain the described time cell site positional information export the time processing module to, export the clock information that obtains to the time decoder module;
The time decoder module is carried out time decoder to the clock information that receives and is obtained absolute clock information and export the time processing module to;
The time processing module, be used for according to the time cell site positional information and absolute clock information calculations obtain present clock information and export BTS to.
9, system according to claim 8 is characterized in that, described time processing module comprises:
Data processing unit MCU is used for calculating present clock information and exporting the time output module to according to described positional information and absolute clock information;
The time output module is used to receive present clock information and exports BTS to.
10, system according to claim 1 is characterized in that, described time receiver module comprises:
The wireless signal receiving element is used for carrying out demodulation, decoding from aerial reception wireless signal, with the clock information that obtains and the described time cell site positional information, and export the time processing module to;
The time decoder module is carried out time decoder to the clock information that receives and is obtained absolute clock information and export the time processing module to;
The time processing module, be used to receive from the clock information of wireless signal receiving element and export the time decoder module to, receive absolute clock information from the time decoder module, and according to the time cell site positional information and this absolute clock information calculations obtain present clock information and export BTS to.
11, system according to claim 10 is characterized in that, described time processing module comprises:
MCU, be used for from wireless signal receiving element receive clock information and export the time decoder module to, receive absolute clock information from the time decoder module, calculate present clock information and export the time output module to according to described positional information and absolute clock information;
The time output module is used to receive present clock information and exports BTS to.
12, according to Claim 8 to 11 each described systems, it is characterized in that described wireless signal receiving element comprises:
Reception antenna is used for from aerial reception wireless signal and exports wireless receiver to;
Wireless receiver, positional information that be used to decode, the demodulation wireless signal obtains cell site of described time and clock information and output.
13, a kind of method that realizes the BTS time synchronized, employing comprises: BTS, time the cell site and the system of time receiver module realize, it is characterized in that this method also comprises:
A. the cell site produces clock information and it is carried out time encoding the time, with self positional information and the coding of the clock information after the time encoding, be modulated into wireless signal and launch;
B. the wireless signal of time receiver module time of reception cell site emission, to wireless signal carry out demodulation, the decoding obtain clock information and the time cell site positional information, described clock information is carried out time decoder obtains absolute clock information, and according to this time the cell site positional information, absolute clock information calculations obtain the BTS that present clock information is sent to self place.
14, method according to claim 13 is characterized in that, among the step a, the method for described generation clock information is: cell site self produces clock information by the time.
15, method according to claim 13 is characterized in that, among the step a, the method for described generation clock information is: the time, the cell site received the satellite-signal of navigation system satellite, produced clock information according to this satellite-signal.
16, method according to claim 13 is characterized in that, among the step a,
The method of described generation clock information is: the time, the cell site received the satellite-signal generation clock information of navigation system satellite, and self produces clock information simultaneously;
Described clock information is carried out further comprising before the time encoding: judged whether described satellite-signal, if having, the clock information that receiving satellite signal produces; Otherwise receive the clock information that self produces.
17, method according to claim 13 is characterized in that, sets in advance the clock information fixed delay of time cell site;
Among the step a, described when carrying out time encoding, the clock information that is produced is added the clock information fixed delay of this cell site obtains new clock information time, again this new clock information is carried out time encoding.
18, method according to claim 13 is characterized in that, sets in advance the clock information fixed delay of time receiver module;
Among the step b, described when calculating present clock information, add this clock information fixed delay and calculate.
19, according to each described method of claim 13 to 18, it is characterized in that the positional information of pre-configured self place BTS in the described time receiver module;
Among the step b, the time receiver module receive one the time cell site wireless signal, the positional information calculation of positional information, absolute clock information and this BTS of cell site obtains present clock information time according to this.
20, according to each described method of claim 13 to 18, it is characterized in that, among the step b, described time receiver module receive one the above time cell site wireless signal, according to the positional information and the delay inequality of each the time cell site's absolute clock information positional information that obtains receiver module place BTS of described time of these cell site a plurality of times, again according to one of them time the cell site positional information and the positional information calculation of absolute clock information and this BTS obtain present clock information.
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| CN 200410080388 CN1756123A (en) | 2004-09-29 | 2004-09-29 | System and method for realizing base station time synchronism |
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| CN 200410080388 CN1756123A (en) | 2004-09-29 | 2004-09-29 | System and method for realizing base station time synchronism |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201851A (en) * | 2010-03-26 | 2011-09-28 | 大唐移动通信设备有限公司 | Remote clock system, equipment and information transmission method |
| CN101860392B (en) * | 2009-04-07 | 2013-01-16 | 中国移动通信集团公司 | Clock synchronization method and system of satellite communication-based base station |
| CN104102125A (en) * | 2013-04-10 | 2014-10-15 | 吴国忠 | Signal transmitting device for miniature radio-controlled watch |
| CN104348607A (en) * | 2013-07-29 | 2015-02-11 | 深圳光启创新技术有限公司 | Method and device for automatically adjusting clock in visible light communication system |
| US8984654B2 (en) | 2010-06-30 | 2015-03-17 | Huawei Technologies Co., Ltd. | Time check method and base station |
| CN106851587A (en) * | 2015-12-04 | 2017-06-13 | 北京信威通信技术股份有限公司 | Identical networking base station synchronization sends the method and system of data |
| CN107493599A (en) * | 2016-06-12 | 2017-12-19 | 中兴通讯股份有限公司 | The methods, devices and systems of time synchronized between base station equipment are realized by baseband radio interface |
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- 2004-09-29 CN CN 200410080388 patent/CN1756123A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860392B (en) * | 2009-04-07 | 2013-01-16 | 中国移动通信集团公司 | Clock synchronization method and system of satellite communication-based base station |
| CN102201851A (en) * | 2010-03-26 | 2011-09-28 | 大唐移动通信设备有限公司 | Remote clock system, equipment and information transmission method |
| CN102201851B (en) * | 2010-03-26 | 2014-04-16 | 大唐移动通信设备有限公司 | Remote clock system, equipment and information transmission method |
| US8984654B2 (en) | 2010-06-30 | 2015-03-17 | Huawei Technologies Co., Ltd. | Time check method and base station |
| US10075428B2 (en) | 2010-06-30 | 2018-09-11 | Huawei Technologies Co., Ltd. | Time check method and base station |
| CN104102125A (en) * | 2013-04-10 | 2014-10-15 | 吴国忠 | Signal transmitting device for miniature radio-controlled watch |
| CN104348607A (en) * | 2013-07-29 | 2015-02-11 | 深圳光启创新技术有限公司 | Method and device for automatically adjusting clock in visible light communication system |
| CN104348607B (en) * | 2013-07-29 | 2017-11-07 | 深圳光启智能光子技术有限公司 | Method and apparatus for clock adjust automatically in visible light communication system |
| CN106851587A (en) * | 2015-12-04 | 2017-06-13 | 北京信威通信技术股份有限公司 | Identical networking base station synchronization sends the method and system of data |
| CN107493599A (en) * | 2016-06-12 | 2017-12-19 | 中兴通讯股份有限公司 | The methods, devices and systems of time synchronized between base station equipment are realized by baseband radio interface |
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