CN101465686B - Method and apparatus for implementing TD-SCDMA base station synchronization - Google Patents
Method and apparatus for implementing TD-SCDMA base station synchronization Download PDFInfo
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- CN101465686B CN101465686B CN 200710161002 CN200710161002A CN101465686B CN 101465686 B CN101465686 B CN 101465686B CN 200710161002 CN200710161002 CN 200710161002 CN 200710161002 A CN200710161002 A CN 200710161002A CN 101465686 B CN101465686 B CN 101465686B
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Abstract
The invention discloses a method for realizing TD-SCDMA base station synchronization, which is used for synchronizing a base station in the absence of GPS signal and includes that: step1, a GPS receiver receives a GPS satellite signal and transmits pulse per second signal to a synchronization module; the synchronization module adopts the pulse per second signal to measure the deviation value of work frequency and standard frequency of a crystal oscillator, and compute the frequency deviation compensation of the crystal oscillator; step 2, when the GPS receiver receives no GPS satellite signal, the GPS receiver informs the synchronization module; when the synchronization module is informed that the GPS receiver receives no GPS satellite signal, the synchronization module adopts frequency deviation compensation to compensate a frame timing signal generated by a clock signal of the crystal oscillator, and the frame timing signal is used for synchronizing the base station. The invention can eliminate phase deviation caused by the frequency deviation of the crystal oscillator and continuously accumulated with time, and enable the frame timing signal of the base station to be synchronous with frame timing signals of other base stations in longer time.
Description
Technical field
The present invention relates to the Clock Synchronization Technology of communication field, relate in particular to a kind of method and apparatus of the TD-SCDMA of realization base station synchronization.
Background technology
TD-SCDMA is a kind of 3G (Third Generation) Moblie technology that time-division and sign indicating number divide are combined, and can know that from itself technical characterstic the net synchronization capability of network is very big to power system capacity and quality of service impacts.Therefore, need to select high stability, high accuracy clock as the network clocking benchmark, stable with the time of guaranteeing whole network.In present TD-SCDMA system, adopting maximum simultaneous techniquess is GPS (Global PositioningSystem; Global positioning system) method of synchronization; Cell base station receives the timing signal of GPS, and the phase difference through between adjustment base station up-downgoing switch enable signal and the GPS pulse per second (PPS) trailing edge makes the constant phase difference between base station signal and the GPS pulse per second (PPS) trailing edge constant; And in the net all base stations all with the gps clock semaphore lock, and the frequency accuracy of GPS reaches 1 * 10
-11Thereby, realize all base stations in the Synchronization Network.
But the problem that is to use said method is the timing signal that the base station sometimes can not receive GPS because satellite-signal crosses weak perhaps GPS receiver fault; Therefore the base station clock that loses synchronisation source becomes the clock that freely turns round, and the precision of the crystal oscillator of base station use is (10 usually
-9～10
-10), through behind the dozens of hour, this base station possibly lose synchronously with other base station, and can not align in its frame boundaries and other base station, with the serious interference that causes adjacent sub-district.
Summary of the invention
For addressing the above problem; The invention provides a kind of method and apparatus of the TD-SCDMA of realization base station synchronization, its purpose is, when not receiving gps satellite signal in the TD-SCDMA base station; Higher frequency stability is provided; The prolongation system keeps the synchronous time, thereby reduces presence of intercell interference, has improved the capacity and the reliability of system.
The invention discloses a kind of method of the TD-SCDMA of realization base station synchronization, be used for synchronous said TD-SCDMA base station when gps signal is lost, comprising:
Step 1; The GPS receiver receives gps satellite signal; The transmission pps pulse per second signal is given synchronization module, and said synchronization module is used pps pulse per second signal and measured the operating frequency of crystal oscillator and the departure between standard frequency, calculates the frequency departure compensation rate of said crystal oscillator;
Step 2; After said GPS receiver does not receive gps satellite signal; Notify said synchronization module; Said synchronization module knows that said GPS receiver does not receive gps satellite signal, uses the frame timing signal of said frequency departure compensation rate compensation according to the clock signal generation of said crystal oscillator, and said frame timing signal is used for synchronous said TD-SCDMA base station.
Said step 1 further comprises:
Step 21; The programmable logic device of said synchronization module receives the pps pulse per second signal that said GPS receiver sends; Synchronous said pps pulse per second signal also produces level signal according to the indication of the central processing unit of said synchronization module; Said level signal is transferred to the counter of said synchronization module as enable signal, and the clock signal of said crystal oscillator is transferred to the counter of said synchronization module as count pulse;
Step 22, the counter of said synchronization module is counted said count pulse number in effective time at said enable signal, when said enable signal is invalid, stops counting, produces and interrupts, and said interruption is sent to said central processing unit;
Step 23, said central processing unit receive has no progeny in said, reads the counting of said counter, measures the operating frequency of said crystal oscillator and the departure between standard frequency;
Step 24, said central processing unit calculate the frequency departure compensation rate of said crystal oscillator according to said departure.
Said programmable logic device is transferred to the level duration of the enable signal of said counter, is disposed to said programmable logic device by said central processing unit.
Also comprise step 41 between said step 23 and the step 24; Said central processing unit is with said counter O reset; Reconfigure the level duration of the enable signal of said programmable logic device; So that the synchronous again said pps pulse per second signal of said programmable logic device produces said enable signal, execution in step 22 and step 23 again, execution in step 41 is for several times in view of the above;
Said step 24 comprises that further said central processing unit goes out the frequency departure compensation rate of said crystal oscillator according to measuring the operating frequency of the said crystal oscillator that obtains and the departure between standard frequency for several times through statistical computation.
Said step 2 further comprises:
Step 51 after said GPS receiver does not receive gps satellite signal, is notified said central processing unit through the serial ports that connects with said central processing unit;
Step 52 after said central processing unit is known, writes said programmable logic device with said frequency departure compensation rate;
Step 53, said programmable logic device is adjusted said frame timing signal according to said frequency departure compensation rate at regular intervals.
The invention also discloses a kind of device of the TD-SCDMA of realization base station synchronization, be used for synchronous said TD-SCDMA base station when gps signal is lost, comprise the GPS receiver; Be used to receive gps satellite signal, output pps pulse per second signal, crystal oscillator; Be used for clock signal, also comprise:
Said GPS receiver also is used for after not receiving gps satellite signal, the notice synchronization module;
Said synchronization module; Be used to receive the pps pulse per second signal of said GPS receiver output; Use said pps pulse per second signal and measure the operating frequency of said crystal oscillator and the departure between standard frequency; Calculate the frequency departure compensation rate of said crystal oscillator; And when knowing that said GPS receiver does not receive gps satellite signal, use the frame timing signal of said frequency departure compensation rate compensation according to the clock signal generation of said crystal oscillator, said frame timing signal is used for synchronous TD-SCDMA base station.
Said synchronization module further comprises: programmable logic device, counter and central processing unit,
Said crystal oscillator also is used for said clock signal is transferred to said counter as count pulse;
Said programmable logic device is used to receive said pps pulse per second signal, and synchronous said pps pulse per second signal also produces level signal according to the indication of said central processing unit, and said level signal is transferred to said counter as enable signal;
Said counter is used for said count pulse number being counted in effective time at said enable signal, when said enable signal is invalid, stops counting, produces and interrupts, and said interruption is sent to said central processing unit;
Said central processing unit; Be used for receiving said having no progeny; Read the counting of said counter, measure the operating frequency of said crystal oscillator and the departure between standard frequency, and calculate the frequency departure compensation rate of said crystal oscillator according to said departure.
Said central processing unit is further used for the level duration that to said programmable logic device configuration is transferred to the enable signal of said counter.
Said central processing unit; Also be used for after said rolling counters forward finishes; With said counter O reset; Reconfigure the level duration of the enable signal of said programmable logic device,, measure thereby the frequency departure amount of said crystal oscillator is carried out several so that the synchronous again said pps pulse per second signal of said programmable logic device produces said enable signal;
Said central processing unit is further used for going out the frequency departure compensation rate of said crystal oscillator through statistical computation according to measuring the operating frequency of the said crystal oscillator that obtains and the departure between standard frequency for several times.
Said GPS receiver is further used for after not receiving gps satellite signal, notifies said central processing unit through the serial ports that connects with said central processing unit;
Said central processing unit, be further used for knowing that said GPS receiver does not receive gps satellite signal after, said frequency departure compensation rate is write said programmable logic device;
Said programmable logic device is further used at regular intervals said frame timing signal being adjusted according to said frequency departure compensation rate.
Beneficial effect of the present invention is, can effectively eliminate the continuous phase deviation of accumulative total in time that causes owing to the crystal oscillator frequency deviation, make the base station frame timing signal in a long time with the frame timing signal basic synchronization of other base station; Usually the frequency departure amount is 10 between the operating frequency of high-precision crystal oscillator and standard frequency
-10, be equivalent to this frequency departure amount of control behind employing the present invention 0.5 * 10
-10In, thereby the frame timing signal deviation is in 4us in 20 hours, reaches in long-time this base station and still can keep the synchronized relation with other base station, has improved the synchronization dependability of TD-SCDMA base station, has improved the service quality of system; And the present invention implements simply, and it is low to implement input cost, and implementation result is remarkable.
Description of drawings
Fig. 1 is the device sketch map of the embodiment of the invention.
Embodiment
When the TD-SCDMA base station lose GPS synchronously after, its crystal oscillator will be in free operating condition.Under this situation; The aging frequency of foozle, crystal oscillator that the deviation of crystal oscillator actual frequency and nominal frequency is mainly derived from crystal oscillator itself floats the temperature frequency difference that variations in temperature causes in the error and the course of work, is generally several PPM (1,000,000/).The crystal oscillator frequency deviation that freely turns round can be divided into two types; One type is because the crystal oscillator short-term instability; And its operating frequency that causes fluctuates near a centre frequency, and according to long-time statistical average analysis, this type of short-term deviation can not cause crystal oscillator clock phase deviation accumulative total; Therefore experience can not cause the timing frame signal and other base station frame head phase deviation accumulation of base station for a long time, thereby can not cause lock-out.Other one type is the frequency drift of crystal oscillator, and this is the frequency departure amount of crystal oscillator actual operating frequency and nominal frequency.When using gps clock semaphore lock crystal oscillator, this frequency departure amount can constantly be corrected, so phase deviation can not add up.But after losing the gps clock signal calibration; This frequency departure can make in time and constantly accumulation of phase deviation; Cause the base station frame timing signal constantly to drift about,, thereby cause this base station and other base station lock-out through a certain amount of deviation of meeting accumulation after the long-time accumulative total.
The present invention mainly overcomes the second quefrency deviation according to top analysis.Method of the present invention is: when the base station can receive gps satellite signal, use the crystal oscillator operating frequency of gps clock signal measurement base station and the departure between standard frequency, calculate the frequency departure compensation rate of said crystal oscillator; When the base station does not receive gps satellite signal; Use the frame timing signal of said frequency departure compensation rate compensation according to the clock signal generation of crystal oscillator; Thereby improve the clock stability of base station crystal oscillator, the prolongation system keeps the synchronous time losing under the gps clock semaphore lock situation.
The device of realization TD-SCDMA base station synchronization of the present invention comprises:
GPS receiver 1 is used for receiving satellite signal, and output 1PPS (Plus Per Second, pulse per second (PPS)) signal is given programmable logic device 2, and GPS receiver 1 is not notified CUP5 through the serial ports that connects with CPU5 after receiving the 6PS satellite-signal.
Programmable logic device 2; Be used to export the required frame timing signal in base station; And the 1PPS signal produces level signal synchronously, said level signal is transferred to said counter 4 as enable signal, when not receiving gps satellite signal; According to the frequency departure compensation rate that CPU5 sends, at regular intervals said frame timing signal is adjusted the clock cycle of several crystal oscillators 3.
Counter 4 is used for when using signal effective, the count pulse that crystal oscillator 3 sends being counted, and when when said enable signal is invalid, stopping counting, produces interruption, and said interruption is sent to CPU5.
CPU5 reads and writes programmable logic device 2 through address wire and data wire, counter 4, and pass through serial ports and communicate by letter with GPS receiver 1.CPU5 is used for the level duration to said programmable logic device 2 configuration enable signals, in receiving that counter 4 sends, has no progeny, and reads the counting of counter 4, measures the operating frequency of crystal oscillator 3 and the departure between standard frequency.CPU5 also is used for after said counter 4 countings finish; With said counter 4 zero clearings; Reconfigure the level duration of the enable signal of said programmable logic device 2; So that the synchronous again said 1PPS signal of said programmable logic device 2 produces said enable signal, measure thereby the frequency departure amount of said crystal oscillator 3 is carried out several, and calculate the frequency departure compensation rate of crystal oscillator 3 according to the departure of measuring for several times; After judging GPS receiver 1 and do not receive gps satellite signal through said serial ports, said compensation rate is write said programmable logic device 2.
The method that TD-SCDMA base station synchronization according to the invention realizes is following:
Step 101; Can correctly receive under the gps satellite signal situation at GPS receiver 1, the 1PPS signal that uses 1 output of GPS receiver is as synchronisation source, and the 10MHz clock signal of in programmable logic device 2, exporting with crystal oscillator 3 is as the clock source; Output phase according to the 1PPS signal adjustment base station required frame timing signal that receives; Make the frame timing signal and the 1PPS signal of output keep fixed skew, thereby the synchronous of interior other base station realized and netted to base station and gps clock semaphore lock.
Step 102 when GPS receiver 1 receives gps satellite signal, is carried out continuous frequency departure measurement amount to crystal oscillator 3.The enable signal of the counter 4 of programmable logic device 2 outputs is the level signals by the 1PPS signal Synchronization; This signal significant level duration can configuration obtains to programmable logic device 2 through CPU5, when enable signal becomes when effective counter 4 enabling countings from invalid; The 10MHz clock signal of using crystal oscillator 3 outputs is as count pulse; When the enable signal of counter 4 stops counting from effectively becoming invalid hour counter 4, and produce interrupt notification CPU5 and handle, CPU5 reads the count value of counter 4; As one-shot measurement to crystal oscillator 3 frequency departure amounts; And then restart next time measurement to crystal oscillator 3 frequency departure amounts, through measure for several times with software statistics on average after, obtain the frequency departure compensation rate of crystal oscillator 3.
Step 103; Judge GPS receiver 1 at CPU5 and lose gps satellite signal; CPU5 writes the frequency departure compensation rate of crystal oscillator 3 in the register of programmable logic device 2; Start the periodicity compensation of 2 pairs of frame timing signals of programmable logic device, the method for compensation is the compensation rate that writes according to CPU5, at set intervals to frame timing signal several 10MHz clock cycle of adjustment.
Embodiment as shown in Figure 1.
GPS receiver 1 receives gps satellite signal, produces the 1PPS signal, and this signal pulse signal that whenever to export a width be 50ns at a distance from 1 second sends to programmable logic device 2 with the 1PPS signal; The 10MHz clock signal of crystal oscillator 3 outputs is used 1PPS signal time reference adjustment frame timing signal output phase as a reference as the work clock of programmable logic device 2, and frame timing signal and 1PPS signal are kept synchronously.
After GPS receiver 1 did not receive gps satellite signal through serial ports notice CPU5, frame timing signal still produced output by the 10MHz clock signal of crystal oscillator 3 through counting accumulative total.CPU5 writes programmable logic device 2 with the frequency departure compensation rate; Write the back programmable logic device 2 inner compensation cycle countings that start a timer according to the frequency departure compensation rate; Programmable logic device 2 is just adjusted several clock cycle to frame timing signal when count value is full, thereby has compensated the phase deviation cumulative amount.Continue compensation process, till GPS receiver 1 receives gps satellite signal.
The present invention is applicable to cdma system, and any have a signal processing, and the engineer of knowledge background such as communication can design corresponding device thereof according to the present invention, and it all should be included in thought of the present invention and the scope.
Claims (8)
1. a method that realizes the TD-SCDMA base station synchronization is used for synchronous said TD-SCDMA base station when gps signal is lost, and it is characterized in that, comprising:
Step 1; The GPS receiver receives gps satellite signal; The transmission pps pulse per second signal is given synchronization module, and said synchronization module is used pps pulse per second signal and measured the operating frequency of crystal oscillator and the departure between standard frequency, calculates the frequency departure compensation rate of said crystal oscillator;
Step 2; After said GPS receiver does not receive gps satellite signal; Notify said synchronization module; Said synchronization module knows that said GPS receiver does not receive gps satellite signal, uses the frame timing signal of said frequency departure compensation rate compensation according to the clock signal generation of said crystal oscillator, and said frame timing signal is used for synchronous said TD-SCDMA base station;
Wherein, said step 1 further comprises:
Step 21; The programmable logic device of said synchronization module receives the pps pulse per second signal that said GPS receiver sends; Synchronous said pps pulse per second signal also produces level signal according to the indication of the central processing unit of said synchronization module; Said level signal is transferred to the counter of said synchronization module as enable signal, and the clock signal of said crystal oscillator is transferred to the counter of said synchronization module as count pulse;
Step 22, the counter of said synchronization module is counted said count pulse number in effective time at said enable signal, when said enable signal is invalid, stops counting, produces and interrupts, and said interruption is sent to said central processing unit;
Step 23, said central processing unit receive has no progeny in said, reads the counting of said counter, measures the operating frequency of said crystal oscillator and the departure between standard frequency;
Step 24, said central processing unit calculate the frequency departure compensation rate of said crystal oscillator according to said departure.
2. the method for realization TD-SCDMA base station synchronization as claimed in claim 1 is characterized in that said programmable logic device is transferred to the level duration of the enable signal of said counter, is disposed to said programmable logic device by said central processing unit.
3. the method for realization TD-SCDMA base station synchronization as claimed in claim 2 is characterized in that,
Also comprise step 41 between said step 23 and the step 24; Said central processing unit is with said counter O reset; Reconfigure the level duration of the enable signal of said programmable logic device; So that the synchronous again said pps pulse per second signal of said programmable logic device produces said enable signal, execution in step 22 and step 23 again, execution in step 41 is for several times in view of the above;
Said step 24 comprises that further said central processing unit goes out the frequency departure compensation rate of said crystal oscillator according to measuring the operating frequency of the said crystal oscillator that obtains and the departure between standard frequency for several times through statistical computation.
4. like the method for claim 1,2 or 3 described realization TD-SCDMA base station synchronization, it is characterized in that said step 2 further comprises:
Step 51 after said GPS receiver does not receive gps satellite signal, is notified said central processing unit through the serial ports that connects with said central processing unit;
Step 52 after said central processing unit is known, writes said programmable logic device with said frequency departure compensation rate;
Step 53, said programmable logic device is adjusted said frame timing signal according to said frequency departure compensation rate at regular intervals.
5. a device of realizing the TD-SCDMA base station synchronization is used for synchronous said TD-SCDMA base station when gps signal is lost, and comprises the GPS receiver; Be used to receive gps satellite signal, output pps pulse per second signal, crystal oscillator; Be used for clock signal, it is characterized in that, also comprise:
Said GPS receiver also is used for after not receiving gps satellite signal, the notice synchronization module;
Said synchronization module; Be used to receive the pps pulse per second signal of said GPS receiver output; Use said pps pulse per second signal and measure the operating frequency of said crystal oscillator and the departure between standard frequency; Calculate the frequency departure compensation rate of said crystal oscillator; And when knowing that said GPS receiver does not receive gps satellite signal, use the frame timing signal of said frequency departure compensation rate compensation according to the clock signal generation of said crystal oscillator, said frame timing signal is used for synchronous TD-SCDMA base station;
Wherein, said synchronization module further comprises: programmable logic device, counter and central processing unit,
Said crystal oscillator also is used for said clock signal is transferred to said counter as count pulse;
Said programmable logic device is used to receive said pps pulse per second signal, and synchronous said pps pulse per second signal also produces level signal according to the indication of said central processing unit, and said level signal is transferred to said counter as enable signal;
Said counter is used for said count pulse number being counted in effective time at said enable signal, when said enable signal is invalid, stops counting, produces and interrupts, and said interruption is sent to said central processing unit;
Said central processing unit; Be used for receiving said having no progeny; Read the counting of said counter, measure the operating frequency of said crystal oscillator and the departure between standard frequency, and calculate the frequency departure compensation rate of said crystal oscillator according to said departure.
6. the device of realization as claimed in claim 5 TD-SCDMA base station synchronization is characterized in that, said central processing unit is further used for said programmable logic device configuration is transferred to level duration of the enable signal of said counter.
7. the device of realization TD-SCDMA base station synchronization as claimed in claim 6 is characterized in that,
Said central processing unit; Also be used for after said rolling counters forward finishes; With said counter O reset; Reconfigure the level duration of the enable signal of said programmable logic device,, measure thereby the frequency departure amount of said crystal oscillator is carried out several so that the synchronous again said pps pulse per second signal of said programmable logic device produces said enable signal;
Said central processing unit is further used for going out the frequency departure compensation rate of said crystal oscillator through statistical computation according to measuring the operating frequency of the said crystal oscillator that obtains and the departure between standard frequency for several times.
8. like the device of claim 5,6 or 7 described realization TD-SCDMA base station synchronization, it is characterized in that,
Said GPS receiver is further used for after not receiving gps satellite signal, notifies said central processing unit through the serial ports that connects with said central processing unit;
Said central processing unit, be further used for knowing that said GPS receiver does not receive gps satellite signal after, said frequency departure compensation rate is write said programmable logic device;
Said programmable logic device is further used at regular intervals said frame timing signal being adjusted according to said frequency departure compensation rate.
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| CN102857196B (en) * | 2011-06-29 | 2016-12-07 | 南京中兴新软件有限责任公司 | A kind of method and system of dynamic compensation crystal frequency deviation |
| CN102394740B (en) * | 2011-10-31 | 2014-02-26 | 杭州华三通信技术有限公司 | Time synchronization method and device |
| CN103051409B (en) * | 2012-12-26 | 2015-08-19 | 中国电子科技集团公司第二十二研究所 | A kind of short wave channel synchronizer and short wave channel synchronous switching control system |
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| CN105657816B (en) * | 2016-03-30 | 2019-03-19 | 京信通信系统（中国）有限公司 | Maintain the method and apparatus of synchronization among base stations |
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| CN108260200A (en) * | 2018-02-27 | 2018-07-06 | 广州钟鼎木林网络技术有限公司 | The method and system that a kind of more synchronisation sources synchronize |
| CN108459239A (en) * | 2018-03-22 | 2018-08-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Distributed traveling wave monitoring terminal time deviation calculating and compensation method and system |
| CN110297208A (en) * | 2019-07-26 | 2019-10-01 | 国网安徽省电力公司电力科学研究院 | Digitize live various dimensions test method and test macro across interval metering system |
| CN110430614B (en) * | 2019-08-06 | 2021-08-31 | 深圳前海中电慧安科技有限公司 | Base station signal synchronization method, device, equipment and storage medium based on GPS signal |
| CN115567092A (en) * | 2020-02-14 | 2023-01-03 | 华为技术有限公司 | Method and apparatus for satellite communication |
| CN111490781B (en) * | 2020-04-22 | 2023-05-26 | 中国科学院国家授时中心 | Time keeping method for controlling voltage-controlled crystal oscillator based on temperature variation difference |
| CN114339345A (en) * | 2020-09-29 | 2022-04-12 | 京东方科技集团股份有限公司 | Source end synchronization device and synchronization method applied to audio and video signals |
| CN112433536A (en) * | 2020-10-27 | 2021-03-02 | 一飞(海南)科技有限公司 | PPS second pulse clock calibration method, processor, storage medium and unmanned aerial vehicle |
| CN112637444A (en) * | 2020-11-19 | 2021-04-09 | 合肥市卓迩无人机科技服务有限责任公司 | NTP millisecond clock synchronization algorithm of multi-path 4k splicing system |
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