CN101369824A - Base station step-out detection apparatus and method - Google Patents
Base station step-out detection apparatus and method Download PDFInfo
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Abstract
The present invention provides an apparatus and method for detecting out-of-step of TD-SCDMA base station nearby the base station, wherein a time offset t1 of local 5ms relative to the GPS is obtained by means of comparing a second pulse outputted by a GPS receiver and the local 5ms clock; a time offset t2 of TD-SCDMA base station 5ms clock relative to the local 5ms clock is obtained by a district searching algorithm; an offset result of the TD-SCDMA base station relative to the GPS is determined based on the sum of the t1 and the t2. by means of the method and the detection apparatus, all classes of base station out-of-step fault of the TD-SCDMA base station, due to GPS device or base station clock, are discovered conveniently, and an out-of-step offset result is obtained. The apparatus and method of the invention is suitable for CDMA IS95 system and CDMA2000 system, at the same time, a standard clock source may also use a GLONASS positioning system or a bid dipper locating synchronizing system.
Description
Technical field
The present invention relates to the radio communication detection technique, be specifically related to the device and method that a kind of base station step-out detects.
Background technology
TD-SCDMA is a time-division CDMA system, and is very sensitive to clock, requires the whole network synchronous, and the simultaneous techniques that adopts mainly is to adopt the GPS simultaneous techniques at present.The all built-in GPS receiver in each TD-SCDMA base station, the frame boundaries that base station down transmits require to align with GPS pulse per second (PPS) strictness, by this mode, guarantee that each base station clock all keeps guaranteeing the realization that the whole network is synchronous thus synchronously with GPS.
Based on the above-mentioned synchronizing characteristics of TD-SCDMA network, used a large amount of GPS receivers in the existing TD-SCDMA net, so use of scale is because the restriction of GPS correlation detection technology can't guarantee not have the problem of step-out to take place.Meanwhile, because the TD-SCDMA network to synchronous sensitiveness, when step-out or clock veneer generation step-out take place the GPS that uses when the base station, will cause the downstream signal of base station that the GPS step-out takes place, for the TD-SCDMA system, this will produce serious disturbance to base station on every side.At present, at the TD-SCDMA network, also there are not suitable base station step-out detection technique and correlate meter.
Under the current situation that does not have a base station step-out detecting instrument, situation at base station step-out, whether traditional detection method is to exist strong jamming to judge by what check TD-SCDMA descending time slot power under no professional state, and there is significant disadvantages in this detection method:
First: this method can't provide the whether conclusion of step-out of base station, and can only contrast affirmation and whether have this problem by changing the hardware clock veneer, and this base station that need reset obviously can influence the normal operation of network;
Second: at the networking initial stage, this moment, traffic carrying capacity was lower, there is not interference among multiple users, said method still can be used, but arrived the construction later stage of network, when having certain traffic carrying capacity, all there is certain service power on all downlink business time slots, this method can't draw related conclusions.
The 3rd: the centre position that this method requires test point to be in problem base station and adjacent normal base station is measured, otherwise, because the far and near difference of distance, have certain asynchronous between the adjacent base station own.
The 4th: this method only can detect the base station that very big skew takes place to a certain extent, is not that very serious base station can't be located for the GPS step-out.
The 5th: the shortcoming of this method is also to confirm that network failure takes time and effort, and mainly is that the dependence experience is come the affirmation problem by artificial method, and this is difficult to finish fast the interference problem location, safeguards the very big burden of bringing for later network operation.
In sum, this traditional detection method can't satisfy requirement of engineering at present, suddenly needs the instrument/instrument that can carry out the base station step-out detection accurately and satisfies TD-SCDMA networking and O﹠M application.
Summary of the invention
First aspect present invention proposes a kind of base station step-out detection apparatus, comprising:
The wireless receiver module is used to receive the downstream signal of base station, carries out radio frequency to intermediate frequency and to the processing procedure of base band, and the output base band data arrives cell search module;
The standard clock source receiver module is used to receive the time reference signal from satellite, provides the standard time pulse per second (PPS) to output to the initial offset detection module;
The local clock module is used for the synchronous needed local clock of generation device self and offers cell search module and initial offset detection module;
The initial offset detection module is used for the very first time skew of basis of calculation time pulse per second (PPS) with respect to local clock, exports this very first time skew;
Cell search module, be used to utilize the base band data that receives, carry out Cell searching and surveying work, the output Search Results, the output scrambler, in lead sign indicating number and find the base station measurement signal clock, and second time migration of the relative local clock of calculation base station measuring-signal clock, send into the step-out measurement module;
Control module is used to receive the external control instruction, and the configuring receiver operating frequency starts or stops the work that cell search module is carried out Cell searching and measurement, starts or stops standard clock source receiver module acceptance criteria time signal;
The step-out measurement module is used for the detection of loss of mains result according to the very first time skew and the second time migration calculation base station, and sends the result to the measurement output module;
Measure output module, be used to export the step-out measurement result, for showing and/or storage.
Wherein, described wireless receiver module is the TD-SCDMA receiver module, and this TD-SCDMA receiver module receives the downstream signal of TD-SCDMA base station;
Described cell search module is the cell search module that is suitable for the TD-SCDMA agreement;
Described base station signal clock is a TD-SCDMA base station 5ms clock;
Described local clock is the 5ms local clock.
Wherein, source receiver module of described standard time is the GPS receiver module, and this GPS receiver module is used to receive gps signal, and GPS pulse per second (PPS) output is provided;
Described standard time pulse per second (PPS) is the GPS pulse per second (PPS).
Wherein, first, second time migration and detection of loss of mains result are unit with chip chip or are unit with millisecond ms;
When being unit with the chip, described step-out measurement module utilizes formula Δ t=(t1+t2) %6400chip to come calculation base station step-out result;
When being unit with the millisecond, described step-out measurement module utilizes formula Δ t=(t1+t2) %5ms to come calculation base station step-out result;
Wherein, t1 is the time migration of base station step-out detection apparatus local clock relative GPS pulse per second (PPS), and t2 is the time migration of the relative base station step-out detection apparatus local clock of base station clock, and Δ t is the detection of loss of mains result of base station clock relative GPS.
Wherein, described wireless receiver module is CDMA IS95 receiver module or CDMA2000 receiver module;
Described cell search module is the cell search module that is suitable for the cell search module of CDMA IS95 agreement or is suitable for the CDMA2000 agreement;
Local clock is the local clock that is suitable for the local clock of CDMA IS95 system or is suitable for CDMA2000.
Wherein, described standard clock source receiver module is GLONASS navigation system receiver module or Big Dipper location synchro system receiver module.
Second aspect present invention proposes a kind of base station step-out detection method, and this method comprises the steps:
Step (1) initial offset detection module is according to the input of GPS pulse per second (PPS) and local 5ms clock, and the time migration that obtains local 5ms clock relative GPS is t1 as a result, sends into the step-out measurement module, is used for the preparation that step-out is calculated;
Step (2) control module is carried out the configuration of local working frequency points, detect gps satellite catch with time synchronized steadily after, sending measuring instructs cell search module, starts cell search process;
The processing of TD-SCDMA modulation signal from the radio frequency to the intermediate frequency finished in the input of step (3) wireless receiver module received RF signal, and intermediate frequency is exported base band data to cell search module to the adaptation procedure of base band;
Step (4) cell search module receives the base band data input, carries out the Cell searching algorithm, obtains to measure the time migration t2 of the local relatively 5ms clock of base station 5ms clock, sends into the step-out measurement module;
Step (5) is in the step-out measurement module, and according to the t1 of input, t2 finishes the detection of loss of mains of base station and calculates, and provides base station step-out Δ t as a result, sends into the measurement reporting module;
Step (6) is measured result's output that reporting module is finished step-out numerical value, is used for showing or storage.
Wherein, base station step-out measurement result Δ t normally obtains in the position measurement near the base station, so that propagation delay can be ignored subtotal.
The method that the present invention proposes further relates to TD-SCDMA base station step-out detection method, based on the base station step-out detection apparatus (Fig. 1) of the present invention's elaboration.This method compares by the pps pulse per second signal and the local 5ms clock of the output of the GPS receiver module in the base station step-out detection apparatus, obtain the time migration t1 of local 5ms clock relative GPS, again by the Cell searching algorithm, obtain the time migration t2 of the local relatively 5ms clock of TD-SCDMA base station 5ms clock, thereby determine the migration result of TD-SCDMA base station relative GPS.
Apparatus and method provided by the invention are applicable to the network optimization and the network patrol work in each stage in TD-SCDMA networking initial stage and the operation process.The invention solves do not have instrument to be correlated with drawback that the TD-SCDMA base station step-out detects, overcome the measurement drawback of artificial comparison method, for TD-SCDMA networking and network O﹠M provide positioning problems apparatus and method fast, described apparatus structure is succinct, with low cost, has saved a large amount of time and cost.
Description of drawings
Fig. 1 is the module frame chart that is used for the TD-SCDMA base station step-out detection apparatus;
Fig. 2 is the signal reception condition of normal TD-SCDMA base station transmit signals to described checkout gear;
Fig. 3 is in the signal reception condition of the TD-SCDMA base station transmit signals of desynchronizing state to described checkout gear.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing.
Fig. 2 and Fig. 3 show TD-SCDMA respectively and under normal circumstances descend the signal of emission and the signal that is received by the terminal in checkout gear or the base station cell with step loss condition.Comparison diagram 2 and Fig. 3, we can see, do not have in the base station under the situation of step-out, the time of the base station signal that checkout gear receives and the time delay of GPS between the standard time, it also is base station step-out measurement result Δ t=propagation delay, under no propagation delay situation (near the base station), the base station signal that base station step-out detection apparatus receives will align with GPS.
If step-out, the then time migration+propagation delay of base station step-out measurement result Δ t=base station relative GPS take place in the base station.
At this moment, under no propagation delay situation (near base station or elimination propagation delay), the base station step-out measurement result that base station step-out detection apparatus obtains is exactly the time migration of base station relative GPS, thus, utilize measurement mechanism between base station signal clock that receives near the position measurement of base station and gps time, whether to exist skew just can judge whether step-out of this measured base station, the inventive principle of Here it is this device.
A kind of base station step-out detection apparatus that provides according to above-mentioned principle is provided Fig. 1, and described device comprises:
Wireless receiver module 100: this module receives the downstream signal of TD-SCDMA base station by connecting the TD-SCDMA radio-frequency antenna, carries out radio frequency to intermediate frequency and to frequency conversion, the sampling processing process of base band, and the output base band data arrives cell search module 150;
Cell search module 150: utilize the base band data that receives, carry out Cell searching and surveying work, the output Search Results, for the TD-SCDMA network, the output scrambler, in lead sign indicating number and find base station 5ms clock, and the time migration t2 of the local relatively 5ms clock of calculation base station 5ms clock, send into step-out measurement module 600;
Control module 200: be used to control the configuration and the measuring management work of TD-SCDMA base station step-out detection apparatus, finish the configuration of system works frequency, and measure management such as starting, measure termination;
Local clock module 300: be used to produce the 5ms clock, cell search module 150 and initial offset detection module 500 are sent in drive system work, are used for time migration and differentiate;
GPS receiver module 400: connect gps antenna, receive gps signal, output GPS pulse per second (PPS) and GPS position, temporal information.
Initial offset detection module 500: based on differentiating skew between GPS pulse per second (PPS) and the local 5ms clock from the GPS pulse per second (PPS) of GPS receiver module 400 and from the local 5ms clock signal of local clock module 300, output offset is t1 as a result;
Step-out measurement module 600: according to exporting the step-out measurement result Δ t of sub-district with the time migration t1 of local 5ms clock and by the local 5ms clock of cell search module input with the time migration t2 calculating of the clock of sub-district 5ms by the GPS pulse per second (PPS) of initial offset detection module 500 input.
Measure output module 700: output step-out measurement result, for showing or storage.
Wherein, t1, t2, Δ t can have two kinds of unit representations, chip (chip) unit or ms (millisecond) unit.
When adopting chip (chip) unit, utilize formula Δ t=(t1+t2) %6400chip to come calculation base station step-out result, wherein t1 is the time migration of base station step-out detection apparatus local clock relative GPS, t2 is the time migration of the relative base station step-out detection apparatus local clock of base station clock, and Δ t is the sideslip result of base station clock relative GPS.
When adopting ms (millisecond) unit, the aforementioned calculation formula is adjusted into:
Δt＝(t1+t2)％5ms。
Base station step-out measurement result Δ t span has two kinds of processing modes, and a kind of is to adopt the frame length of a subframe to come value, promptly adopts [0, T] to represent that wherein T is expressed as the subframe frame length of TD-SCDMA, also is that [0,5ms] or [0,6400chip] are represented.
A kind of is to adopt half subframe frame length to represent, [1/2T, 1/2T] represent, also be [2.5ms, 2.5ms] or [3200chip, 3200chip], base station step-out measurement result Δ t value was less than 0 o'clock, the expression base station clock is in advance in GPS, when base station step-out measurement result Δ t value greater than 0 the time, the expression base station clock lags behind GPS.
Below in conjunction with Fig. 1, provide the method flow that base station step-out detects:
Base station step-out detection apparatus is behind electrifying startup, and local clock module 300 produces stable 5ms clock output, drive system work.
Connect the GPS radio-frequency antenna to base station step-out detection apparatus, GPS receiver module 400 enters initialization procedure behind electrifying startup, finish that gps satellite is caught and time synchronized after, export GPS pps pulse per second signal and positional information.
Connect the TD-SCDMA radio-frequency antenna to base station step-out detection apparatus, at electrifying startup, control module 200 is finished after the local frequency configuration, wireless receiver module 100 enters the data receiving state of specifying frequency, finish the processing of TD-SCDMA modulation signal from the radio frequency to the intermediate frequency, and intermediate frequency is exported base band data to cell search module 150 to the adaptation procedure of base band;
Initial offset detection module 500 is according to the GPS pulse per second (PPS) of GPS receiver module 400 output and the input of local 5ms clock, and the time migration that calculates local 5ms clock relative GPS is t1 as a result, sends into step-out measurement module 600, is used for step-out result's calculating;
Control module 200 is in the frequency configuration of finishing the work, and detect gps satellite catch with time synchronized steadily after, sending measuring instructs cell search module 150, start cell search process, by search, determine cell scrambling, the discovery base station 5ms clock of the coverage base station of test zone, and the time migration t2 of the local relatively 5ms clock of calculation base station 5ms clock, send into step-out measurement module 600;
Step-out measurement module 600 is according to the t1 of input, and t2 finishes the step-out of base station and calculates, and provides step-out measurement result Δ t, sends into and measures reporting module 700;
Measure reporting module 700 and finish the output that reports of step-out measurement result, be used for showing and/or storage step-out measurement result.
Wherein, t1, t2, Δ t can have two kinds of unit representations, chip (chip) unit or ms (millisecond) unit.
When adopting chip (chip) unit, utilize formula Δ t=(t1+t2) %6400chip to come calculation base station step-out result, wherein t1 is the time migration of base station step-out detection apparatus local clock relative GPS, t2 is the time migration of the relative base station step-out detection apparatus local clock of base station clock, and Δ t is the sideslip result of base station clock relative GPS.
When adopting ms (millisecond) unit, the aforementioned calculation formula is adjusted into:
Δt＝(t1+t2)％5ms
Base station step-out measurement result Δ t span has two kinds of processing modes, and a kind of is to adopt the frame length of a subframe to come value, promptly adopts [0, T] to represent that wherein T is expressed as the subframe frame length of TD-SCDMA, also is that [0,5ms] or [0,6400chip] are represented.
A kind of is to adopt half subframe frame length to represent, [1/2T, 1/2T] represent, also be [2.5ms, 2.5ms] or [3200chip, 3200chip], base station step-out measurement result Δ t value was less than 0 o'clock, the expression base station clock is in advance in GPS, when base station step-out measurement result Δ t value greater than 0 the time, the expression base station clock lags behind GPS.
Use TD-SCDMA base station step-out detection apparatus of the present invention and method of measurement, can be applied in TD-SCDMA sweep generator and the other-end equipment, be used in the process of the network optimization base station of pinpointing the problems fast and accurately, fixer network disturbs.
The above is preferred embodiment of the present invention only, is not limited to the present invention, all any modifications of being made within the present invention spirit and principle, is equal to replacement and improvement etc., all is contained within protection scope of the present invention.For example, the base station step-out detection method not only is adapted to the TD-SCDMA network, above-mentioned processing at TD-SCDMA is replaced with processing module at CDMA (IS95 or 2000) network, to be adapted to cdma network equally, simultaneously, the GPS relevant treatment is revised as the receiver module of the GLONASS or the Big Dipper, will not only go for the GPS synchronizing network, for using GLONASS, the synchronous wireless network of the Big Dipper is suitable for too.
Claims (10)
1. base station step-out detection apparatus comprises:
The wireless receiver module is used to receive the downstream signal of base station, carries out radio frequency to intermediate frequency and to the processing procedure of base band, and the output base band data arrives cell search module;
The standard clock source receiver module is used to receive the time reference signal from satellite, provides the standard time pulse per second (PPS) to output to the initial offset detection module;
The local clock module is used for the synchronous needed local clock of generation device self and offers cell search module and initial offset detection module;
The initial offset detection module is used for the pulse per second (PPS) of basis of calculation time with respect to the skew of very first time of local clock, exports this very first time to be displaced to the step-out measurement module;
Cell search module, be used to utilize the base band data that receives, carry out Cell searching and surveying work, the output Search Results, the output scrambler, in lead sign indicating number and find the base station measurement signal clock, and second time migration of the relative local clock of calculation base station measuring-signal clock, send into the step-out measurement module;
Control module is used to receive the external control instruction, and the configuring receiver operating frequency starts or stops the work that cell search module is carried out Cell searching and measurement, starts or stops standard clock source receiver module acceptance criteria time signal;
The step-out measurement module, be used for according to the very first time skew and second time migration with calculation base station detection of loss of mains result, and send the result to the measurement output module;
Measure output module, be used to export the step-out measurement result, for showing and/or storage.
2. device as claimed in claim 1 is characterized in that:
Described wireless receiver module is the TD-SCDMA receiver module, and this TD-SCDMA receiver module receives the downstream signal of TD-SCDMA base station;
Described cell search module is the cell search module that is suitable for the TD-SCDMA system;
Described base station signal clock is a TD-SCDMA base station 5ms clock;
Described local clock is the 5ms local clock.
3. device as claimed in claim 2 is characterized in that:
Source receiver module of described standard time is the GPS receiver module, and this GPS receiver module is used to receive gps signal, and GPS pulse per second (PPS) output is provided;
Described standard time pulse per second (PPS) is the GPS pulse per second (PPS).
4. device as claimed in claim 3 is characterized in that:
First, second time migration and detection of loss of mains result are unit with chip chip or are unit with millisecond ms;
When being unit with the chip, described step-out measurement module utilizes formula Δ t=(t1+t2) %6400chip to come calculation base station step-out result;
When being unit with the millisecond, described step-out measurement module utilizes formula Δ t=(t1+t2) %5ms to come calculation base station step-out result;
Wherein, t1 is the time migration of base station step-out detection apparatus local clock relative GPS pulse per second (PPS), and t2 is the time migration of the relative base station step-out detection apparatus local clock of base station clock, and Δ t is the detection of loss of mains result of base station clock relative GPS clock, if Δ t is not near-sighted is zero, then base station step-out.
5. as claim 1 or 3 described devices, it is characterized in that:
Described wireless receiver module is CDMA IS95 receiver module or CDMA2000 receiver module;
Described cell search module is the cell search module that is suitable for the cell search module of CDMA IS95 system or is suitable for the CDMA2000 system;
Local clock is the local clock that is suitable for the local clock of CDMA IS95 system or is suitable for CDMA2000.
6. device as claimed in claim 1 or 2 is characterized in that:
Described standard clock source receiver module is GLONASS navigation system receiver module or Big Dipper location synchro system receiver module.
7. one kind is carried out the base station step-out detection method when propagation delay time can be ignored, and comprises the steps:
A, acceptance criteria time signal, the synchronous needed local clock of generation device self calculates the very first time skew of local clock with respect to time reference signal simultaneously;
B, carry out the configuration of local working frequency points, time reference signal receive normal after, sending measuring instructs cell search module, starts cell search process;
C, received RF signal are finished the processing of wireless modulated signals from the radio frequency to the intermediate frequency, and intermediate frequency is exported base band data to the adaptation procedure of base band;
D, reception base band data are carried out the Cell searching algorithm, find the base station measurement signal clock, and second time migration of the relative local clock of calculation base station measuring-signal clock;
E, based on the very first time skew and second time migration with calculation base station detection of loss of mains result;
F, the described testing result of output are used for showing and/or storage.
8. method as claimed in claim 7 is characterized in that:
Carrying out described base station step-out detection near the place, base station.
9. method as claimed in claim 7 is characterized in that:
Described base station is the TD-SCDMA base station, and described local clock is the 5ms of a TD-SCDMA system local clock signal, and described time reference signal is a gps time signal.
10. method as claimed in claim 9 is characterized in that:
First, second time migration and detection of loss of mains result are unit with chip chip or are unit with millisecond ms;
When being unit, utilize formula Δ t=(t1+t2) %6400chip to come calculation base station step-out result with the chip;
When being unit, utilize formula Δ t=(t1+t2) %5ms to come calculation base station step-out result with the millisecond;
Wherein, t1 is the time migration of base station step-out detection apparatus local clock relative GPS pulse per second (PPS), and t2 is the time migration of the relative base station step-out detection apparatus local clock of base station clock, and Δ t is the detection of loss of mains result of base station clock relative GPS, if Δ t is not near-sighted is zero, then base station step-out.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010148981A1 (en) * | 2009-12-30 | 2010-12-29 | 中兴通讯股份有限公司 | Method and system for implementing clock synchronization based on wireless manner |
| WO2012155700A1 (en) * | 2011-08-11 | 2012-11-22 | 中兴通讯股份有限公司 | Method and device for locking failure determination and synchronization maintenance for global positioning system |
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| FI974310A (en) * | 1997-11-24 | 1999-05-25 | Nokia Telecommunications Oy | A method for synchronizing base stations and a cellular radio system |
| US6353412B1 (en) * | 1998-03-17 | 2002-03-05 | Qualcomm, Incorporated | Method and apparatus for determining position location using reduced number of GPS satellites and synchronized and unsynchronized base stations |
| CN101136694A (en) * | 2002-02-05 | 2008-03-05 | 美商内数位科技公司 | Method and apparatus for synchronizing base stations |
| CN101043292B (en) * | 2006-03-24 | 2011-05-18 | 大唐移动通信设备有限公司 | Packet scheduling method of high-speed downlink packet access system and base station using the same |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010148981A1 (en) * | 2009-12-30 | 2010-12-29 | 中兴通讯股份有限公司 | Method and system for implementing clock synchronization based on wireless manner |
| CN102118779B (en) * | 2009-12-30 | 2014-12-10 | 中兴通讯股份有限公司 | Method for realizing clock synchronization based on wireless system |
| WO2012155700A1 (en) * | 2011-08-11 | 2012-11-22 | 中兴通讯股份有限公司 | Method and device for locking failure determination and synchronization maintenance for global positioning system |
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