CN100375556C - Method for testing mobile communication system burst signal - Google Patents
Method for testing mobile communication system burst signal Download PDFInfo
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- CN100375556C CN100375556C CNB2004100884066A CN200410088406A CN100375556C CN 100375556 C CN100375556 C CN 100375556C CN B2004100884066 A CNB2004100884066 A CN B2004100884066A CN 200410088406 A CN200410088406 A CN 200410088406A CN 100375556 C CN100375556 C CN 100375556C
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Abstract
The present invention relates to a test method for burst signals in a mobile communication system, particularly to a TD-SCDMA or TSM system which collects continuous signals within certain time in real time and can conveniently capture signals under the discontinuous sending states of a terminal and a base station and various required test signals such as Uppts, RAC and F-PACH in the connecting or conversion process. A tester continuously carries out analog/digit conversion for received signals, and stores the converted digital baseband signal data after conversion in a preset time window. When specific burst signals need to be captured, trigger signals which are relevant to the specific burst signals are generated, and the capture process of the tester is triggered. Modes for generating the trigger signals comprise external trigger, power trigger and frequency template trigger. The tester determines the capture position point through the trigger signals, and records the digital baseband signal data which are taken out before and after triggered with proportion in the time window. Fast Fourier conversion is carried out, and the conversed results are stored for display and analysis processing.
Description
Technical field
The present invention relates to the wireless signal measurement technology of mobile communication system, relate to method of testing or rather as TD-SCDMA or some special burst (Burst) signals of TSM system, for example be in terminal access or handoff procedure, and under the discontinuous emission in base station (DTX) state, terminal is to seizure, collection and the analytical method of wireless burst signal.
Background technology
In recent years, the 3G (Third Generation) Moblie technology is the focus that people pay close attention to always.And the TD-SCDMA system is because of its unique technique advantage, be received to one of 3G (Third Generation) Moblie standard by International Telecommunications Union, its air interface is comparatively ripe on technology realizes, but the test of wireless signal and analytical method are relatively then not well established, await to improve.
Test for wireless signal, the difference of the maximum of TD-SCDMA signal and Wideband Code Division Multiple Access (WCDMA) (WCDMA) or CDMA2000 is that TD-SCDMA is time division duplex (TDD) pattern, is based on that time division multiple access (TDMA) frame structure that periodically repeats in the time domain realizes.Its frame structure as shown in fig. 1, by time slot TS0, several uplink and downlink business time-slot TS1-TS6 and be positioned at TS0 and TS1 between be used for synchronous downward guide time slot Dwpts and up guide time slot Uppts forms, each time slot all is operated in burst (Burst) state, can realize the flexible switching between the uplink downlink easily, be particularly suitable for the non-symmetrical service of 3G.
Frequency spectrograph is all used in the test of TD-SCDMA wireless signal at present basically.Traditional sweep-frequency B frequency spectrograph has only a resolution bandwidth filter (analog filter), when the fixedly time slot burst of catching as up guiding (Uppts), use maximum hold mode (Maximum Hold), whether remove to observe this signal occurs, for other forms of signal, then generally take the method that dynamic observes.
Frequency spectrograph generally is used for analyzing continuous signal or periodic signal clocklike.When analyzing continuous signal,, can trigger seizure randomly, and each to trigger the signal that captures also be identical, so when showing, do not need to provide temporal information because continuous signal is not subjected to the influence of pull-in time.Yet, when analyzing burst, the analytical method of general frequency spectrograph, because be difficult to produce rational triggering signal, pull-in time is too short, and the time relationship that is difficult to show for a long time nonperiodic signal, therefore can't satisfy under the real-time working state needs substantially to the seizure and the analysis of wireless burst signal, also be, above-mentioned maximum hold mode can't capture the signal specific that burst occurs in the ordinary course of things with the method that dynamic observes, and seizure also just is far from being less than signal specific signal specific is tested and analyzed.
Such as: when the fixedly time slot burst of catching as up guiding (Uppts), if use maximum hold mode, because can not demonstrate the time relationship of signal, thereby can't clearly know the Uppts signal of being tested be when occur, occurred several times, thereby be unfavorable for relation between analytic signal; When measuring the burst of same time slot, access request (RACH) such as Reverse Access Channel, if use the mode that dynamic observes, because of observed signal identical with the signal that other may occur subsequently, difference only is the time relationship difference, whether but general frequency spectrograph is difficult to show the time relationship of long-time signal again, thereby can't judge signal and occur; Contradictory relation because of sweep time and screen resolution, can not test the signal (pull-in time of general frequency spectrograph can only be surveyed 100ms at most with interior signal) of a long-time process, thereby can't carry out as insert or handoff procedure in the test and the analysis of signal, such as can not be well according to test result distinguish be transmitting power inadequately or the quality problems of signal itself etc.
Summary of the invention
The objective of the invention is to design a kind of method of testing of mobile communication system burst signal, particularly to some special bursts of TD-SCDMA or TSM system, the answer of uplink synchronizing signals is replied signals such as (F-PACH) as up pilot signal (Uppts), the access request signal (RACH) of Reverse Access Channel, base station in access or the handoff procedure, and the real-time testing of the signal under base station or the discontinuous emission of terminal (DTX) state.
The technical scheme that realizes the object of the invention is: a kind of method of testing of mobile communication system burst signal, test by the tester that comprises spectrum analysis and vector analysis, it is characterized in that comprising following treatment step: a frequency templates is set in tester in advance, and the Frequency point of this frequency templates is set to the frequency of subcarrier in the TD SDMA TD-SCDMA mobile communication system;
A. tester carries out mould/transformation of variables continuously to the signal that receives, and the digital baseband signal data after the mould/transformation of variables of preset time window stored;
When B. the signal power that receives when tester reaches the default performance number of described frequency templates, produce triggering signal on described subcarrier frequency, trigger the capture-process of tester;
C. tester is at the catching position place that is determined by triggering signal, will by before time span before triggering and the triggering of proportional recording in time window that triggers the back time span with trigger after the digital baseband signal data take out, handle and store, for showing and analyzing.
The inventive method is by tester the radiofrequency signal that receives to be carried out carrying out mould/transformation of variables and storage continuously after the down-conversion, when needs are caught certain specific burst, by the triggering signal relevant that is produced with this signal specific, trigger the capture-process of tester, after tester triggers, with the forward and backward signal data taking-up of catching position (pull-in time) of record in proportion, carry out fast Fourier transform (FFT), again the data after the conversion are stored, for showing and analyzing and processing.
The present invention is gathering burst, especially gather some special bursts (Burst) signal of TD-SCDMA, as signals such as Uppts, RACH in access or the handoff procedure, F-PACH, and the signal under the discontinuous emission in base station (DTX) state, with the time window of setting, measured signal is gathered in real time and stored, and the signal of real-time collection and storage is made fast Fourier transform (FFT), FFT result is shown with the form of three-dimensional collection of illustrative plates, for customer analysis.
The present invention utilizes the characteristics of TD-SCDMA or TSM signal, comprises external trigger by providing, and the mode that power trigger and frequency templates trigger produces the capture-process that triggering signal triggers tester.
Frequency templates triggering mode wherein is to utilize the TD-SCDMA subcarrier not send the particularity of broadcast singal, be the characteristics that subcarrier does not send any signal when not having business under the test mode, triggering collection when the signal power of a certain certain subcarriers frequency reaches the performance number of setting template, therefore can when appearring in subcarrier, trigger burst seizure, the major and minor carrier wave of recording occurring continuously triggers the data in a period of time of front and back simultaneously, thereby observes assignment and handoff procedure between the major-minor carrier wave.
Because collection of the present invention is interior real-time continuous signal of a period of time, can capture needed various measured signals in test and analytic process easily, therefore thoroughly solve and used maximum hold mode and dynamic observe mode can't be carried out test analysis because of the appearance that can't capture signal specific problem.
Description of drawings
Fig. 1 is the frame assumption diagram of TD-SCDMA signal;
Fig. 2 is the method for testing steps flow chart block diagram of burst of the present invention;
Fig. 3 is the seizure and the analytical structure schematic diagram of typical mobile communication system radiofrequency signal;
Fig. 4 is an external trigger mode signal flow schematic diagram;
Fig. 5 is a power trigger mode schematic diagram;
Fig. 6 is a frequency templates triggering mode schematic diagram;
Fig. 7 is a tester testing process schematic block diagram of the present invention;
Fig. 8 is a fast fourier transform, changes the graphics of demonstration with the power with frequency of continuous time;
Fig. 9 is access or the handoff procedure with the signal analysis TD-SCDMA of the inventive method collection storage, is assigned to schematic diagram on the subcarrier until business time-slot, is made up of Fig. 9 A, 9B, 9C.
Embodiment
Referring to Fig. 2, the testing process of the signal of wireless burst shown in the figure.Comprise: step 21, the seizure of live signal triggers; Step 22, the live signal collection; Step 23, collection result shows; Step 24, historical data analysis.
Can correctly trigger test (step 21) to catch the prerequisite that tested burst is real-time signal analysis.The present invention provides the seizure triggering mode of three kinds of signals: external trigger; Power trigger; Trigger with frequency templates.
When test position during in end side, external trigger is meant by terminal and directly provides triggering signal.Referring to Fig. 3, the seizure of the radiofrequency signal of a typical mobile communication system and analytic process shown in the figure.The radiofrequency signal of base station 34 emissions is propagated by air traffic channel or channel simulator 35, the radiofrequency signal that the end side antenna receives is divided into two-way by power splitter 33, one the tunnel gives terminal 31, and tester 32 (providing the two-way process that receives with emission among the figure) is given on another road.Tester 32 needs triggering signal of terminal 31 outputs to trigger the capture-process of tester 32 in order to capture certain specific signal.Tester 32 has real time spectrum and vector analysis function.
For example the digital signal processor of terminal (DSP) produces a rising edge or trailing edge sending output of up steering signal (Uppts) set before, is used for triggering tester and begins capture-process.As shown in Figure 4, terminal signaling processing unit 41 provides transmitting terminal synchronizing signal (rising edge), and the triggering input of tester 42 begins capture-process after receiving this transmitting terminal synchronizing signal.
Test position is when end side, and power trigger is meant among Fig. 3 that the radiofrequency signal that the end side antenna receives is divided into two-way by power splitter 33, and one the tunnel gives terminal 31, and tester 32 is given on another road.Tester 32 need not to trigger capture-process by terminal 31 output triggering signals, but triggers capture-process by tester self.Because the terminal transmit power that arrives tester 32 is generally greater than the terminal received power, utilize this difference power, tester 32 can be provided with the power trigger levels of an a little higher than terminal incoming level, then when terminal 31 begins to launch (the up steering signal Uppts of general emission earlier), the level of RF signals that tester receives has surpassed this power trigger levels, self provide triggering signal by tester 32, trigger capture-process.As shown in Figure 5, the power trigger levels of setting is higher than received signal level (as TS0) but is lower than transmission signal level (as Uppts, TS2).
Test position is during in end side or in base station side, and frequency templates triggers and is meant among Fig. 3 that the radiofrequency signal that the end side antenna receives is divided into two-way by power splitter 33, and one the tunnel gives terminal 31, and tester 32 is given on another road.Tester 32 need not to trigger capture-process by terminal 31 output triggering signals, but triggers capture-process by tester self.When adopting, the TD-SCDMA mobile communication system on main carrier, sends synchronizing signal, when on subcarrier, not sending the working method that is used for synchronous broadcast singal, promptly utilize under test mode and not have the particularity that subcarrier when professional does not send any signal, can the frequency of utilization template trigger function, when just the signal power on a certain characteristic frequency (a certain subcarrier frequency) reaches the stencil value (performance number) of setting, provide triggering signal by tester self, trigger capture-process.As shown in Figure 6, on subcarrier 2, be provided with and trigger the frequency templates value,, when the signal power on subcarrier 2 frequencies triggers the frequency templates value greater than this, provide triggering signal, trigger capture-process by tester self when business time-slot is assigned on the subcarrier 2.Therefore by the capture-process that suitable frequency templates can trigger tester is set.Because it is that signal power on subcarrier 2 frequencies is during greater than this triggering frequency templates value that frequency templates triggers, provide triggering signal by tester self and trigger capture-process, thereby also frequency templates can be triggered a kind of special power trigger mode regarded as.
The present invention is when carrying out live signal collection (step 21), adopt mass storage that radio frequency (RF) signal that receives is gathered in real time and stored, and signal made fast Fourier transform (FFT), the result of FFT is shown with the form of three-dimensional collection of illustrative plates, thereby be convenient to analyze and measure.Concrete steps as shown in Figure 7.Comprise: step 71, down-conversion and analog-to-digital conversion; Step 72, first buffer memory; Step 73, fast fourier transform; Step 74, second buffer memory; Step 75 shows.
Be transformed into the digital baseband signal data after radiofrequency signal (RF) process down-conversion and the analog-to-digital conversion (step 71), in first buffer of forming by circulating memory, store (step 72), to send into high speed digital signal processor (DSP) at the signal (signal in the time window) in this circulating memory before and after triggering signal triggers constantly and carry out Fourier (FFT) conversion (step 73), storage is in second buffer (step 74) after the conversion, thereby the real-time demonstration that realizes the signal in the certain hour window is for customer analysis.When realizing, can set a time window (as 5 seconds), the storage depth of circulating memory just, at this moment between all signals in the window will seamlessly be shown (general frequency spectrograph then can not be analyzed the signal in a period of time continuously).
Compromise as resolution and buffer size, the sampling interval of signals collecting gets 1-10us and is advisable in the digital-to-analogue conversion, simultaneously as the measurement of TD-SCDMA signal power, it is 0.22 root raised cosine filter that its fft filters should be selected rolloff-factor, and the measurement bandwidth is 1.28MHz.
When making FFT, it is long to choose suitable FFT window according to the shows signal precision, is example with the Hamming window, and FFT window length generally about 4096 o'clock, also can select the window function of FFT to eliminate spectrum leakage in addition as required.
Test for convenience with analyze, the trigger position of acquired signal should be arranged on the percent position of acquisition length (promptly earlier free window is determined the forward and backward data of triggering according to position percentage again) in real time.For example when the internal memory of tester is 128M, can set the 64M that recycles wherein, and then 10% percentage point is set, when triggering seizure, 640K data before then taking-up triggers and the 63.3M data after the triggering.Acquisition length for example is set is 1 second (time window length is 1 second), when position percentage is 80% (Position%=80), 800 milliseconds of signals after trigger collection is caught preceding 200 milliseconds and triggered seizure, so just the signal before triggering can not missed, this point is particularly useful when catching the signal that can not trigger.For example in the tester debug process, when catching, can use the signal such as the RACH signal triggering of its back less than the Uppts signal.Trigger a segment signal before owing to use the method for setting percentage to write down, therefore can find Uppts by RACH.
Before the above-mentioned triggering that is recorded in proportion in the time window with trigger after the digital baseband signal data, comprising in advance that a percent position at circulating memory is provided with triggers constantly, after triggering signal triggers, digital baseband signal data in the circulating memory are taken out, and these data comprise the triggering forward and backward two-part data constantly that precentagewise is set.That is to say before can catch triggering signal simultaneously takes place and two parts data after taking place, thereby be convenient to observe the signal that is difficult for being triggered to before those triggering signals occur in triggering signal.
Equally, utilize frequency templates to trigger and to catch and to analyze the signal that to miss when using traditional spectrum analyzer and VSA to test, for example, can demonstrate at base station transmitter close moment, main carrier and leak into signal on the subcarrier.In other words, when passing through frequency of utilization template triggering mode, be that subcarrier is when mode that the signal triggering of certain power catches occurring, base station transmitter needs only when the signal of closing leakage in a flash reaches this setting power will trigger capture-process, thereby can show the leakage situation of signal spectrum.
The result shows and historical data analysis (step 23,24) that the result of Fourier transform (FFT) shows with the three dimensional form that frequency (Frequency) changes with the power (Power) of continuous time (Time), as shown in Figure 8.Just can analyze historical data easily according to this three-dimensional display figure.
Fig. 9 illustrates access or the handoff procedure with the signal analysis TD-SCDMA that gathers, stores.As, in the three-dimensional collection of illustrative plates of live signal, horizontal direction is frequency (or time shaft), vertical direction is time shaft or frequency, can represent power with the different colours (perhaps using the demonstration of similar effect) of signal.From Fig. 9 A as can be seen, at the A point constantly, terminal to transmit uplink pilot signal Uppts, and behind the frame (5ms) of being separated by, response message F-PACH is replied in the base station on the 5th time slot (TS5) B point.Because the time window long enough of setting (for example 1 second), and can further show the access or the handoff procedure of whole terminal continuously, shown in Fig. 9 B, 9C.Among Fig. 9 B, after A point terminal As-received stands in the last response message F-PACH that replys of the 5th time slot (TS5) (being the B point among Fig. 9 A), initiate to insert request signal RACH at the 2nd time slot (TS2) B point every frame (5ms).Then in Fig. 9 C, can also see that equally the final service time slot is assigned to the situation on one of them subcarrier (22014.4KHz) in three carrier waves (a main carrier 2012.8KHz and two subcarrier 2010.2KHz, 2014.4KHz), communication link is based upon on the dedicated channel (DCH) of these subcarrier 1,4 time slots (A, B point).
In the inventive method,, therefore thoroughly solved the problem that to catch specific burst with traditional maximum hold mode, the mode of dynamic observing because the signal of gathering is the real-time continuous signal in a period of time.
Claims (8)
1. the method for testing of a mobile communication system burst signal, test by the tester that comprises spectrum analysis and vector analysis, it is characterized in that comprising following treatment step: a frequency templates is set in tester in advance, and the Frequency point of this frequency templates is set to the frequency of subcarrier in the TD SDMA TD-SCDMA mobile communication system;
A. tester carries out mould/transformation of variables continuously to the signal that receives, and the digital baseband signal data after the mould/transformation of variables of preset time window stored;
When B. the signal power that receives when tester reaches the default performance number of described frequency templates, produce triggering signal on described subcarrier frequency, trigger the capture-process of tester;
C. tester is at the catching position place that is determined by triggering signal, will by before time span before triggering and the triggering of proportional recording in time window that triggers the back time span with trigger after the digital baseband signal data take out, handle and store, for showing and analyzing.
2. method according to claim 1, it is characterized in that: this method further comprises: by the outer portable terminal of tester or base station equipment before sending a certain burst, output of set, produce a rising edge or trailing edge as triggering signal, be used for triggering tester and begin capture-process.
3. method according to claim 2 is characterized in that: comprised output of set before the reference signal of up steering signal Uppts by the digital signal processor of portable terminal in transmission, produce described rising edge or trailing edge.
4. method according to claim 1 is characterized in that: this method further comprises: a power trigger levels is set in tester, when the signal level of tester reception is higher than this power trigger levels, provides triggering signal, trigger capture-process.
5. method according to claim 4, it is characterized in that: described triggering level is higher than the incoming level of portable terminal but is lower than the launching electrical level of portable terminal, when portable terminal begins to launch up steering signal Uppts, the level that tester receives this up steering signal Uppts surpasses its power trigger levels, and tester provides described triggering signal.
6. method according to claim 1 is characterized in that: in the described steps A, in the preset time window stored, be to be the circulating memory stored of Preset Time window at storage depth.
7. method according to claim 1, it is characterized in that: among the described step C, before the described triggering that is recorded in proportion in the time window with trigger after the digital baseband signal data, comprising in advance that a percent position at circulating memory is provided with triggers constantly, after triggering signal triggers, digital baseband signal data in the circulating memory are taken out, and these data comprise the triggering forward and backward two-part data constantly that precentagewise is set.
8. method according to claim 1, it is characterized in that: among the described step C, described processing is that the data of taking out are carried out fast fourier transform, described demonstration is that the result behind the Fourier transform is shown with the form of the three-dimensional collection of illustrative plates of the power with frequency variation of continuous time, in this three-dimensional collection of illustrative plates, represent frequency and time shaft respectively with horizontal direction, vertical direction, the signal indication of representing with different colours is a power.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4719718B2 (en) * | 2007-06-08 | 2011-07-06 | アンリツ株式会社 | Signal analyzer |
| CN101128009B (en) * | 2007-09-18 | 2010-06-16 | 中兴通讯股份有限公司 | A method and device for interference test of WiMAX system |
| CN101888645A (en) * | 2009-05-13 | 2010-11-17 | 王松岩 | Data storage 3G and air interface protocol analyzer for next generation mobile communication system |
| CN103929260A (en) * | 2014-03-12 | 2014-07-16 | 上海风格信息技术股份有限公司 | Analysis method for abnormal radio frequency points |
| CN107612641A (en) * | 2017-09-05 | 2018-01-19 | 广东阿尔创通信技术股份有限公司 | TDD standards wireless communication system uplink interference test device and method of testing |
| CN110518957B (en) * | 2019-07-30 | 2020-11-06 | 北京大学 | Bypass network guiding method in open wireless channel |
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| JPH1010168A (en) * | 1996-06-21 | 1998-01-16 | Advantest Corp | Spectrum analyzer for measuring tdma wave |
| CN1434645A (en) * | 2002-01-23 | 2003-08-06 | 华为技术有限公司 | Device and method for estimating burst sygnal signal-to-noise ratio in global mobile communication system base station |
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| JPH1010168A (en) * | 1996-06-21 | 1998-01-16 | Advantest Corp | Spectrum analyzer for measuring tdma wave |
| CN1434645A (en) * | 2002-01-23 | 2003-08-06 | 华为技术有限公司 | Device and method for estimating burst sygnal signal-to-noise ratio in global mobile communication system base station |
Non-Patent Citations (1)
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