CN101079664B - A detection method and device of base station power of TD-SCDMA system - Google Patents
A detection method and device of base station power of TD-SCDMA system Download PDFInfo
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Abstract
The invention discloses a testing method and device of TD-SCDMA system base station power, which is characterized by the following: finding time point of power within downward pilot time slot period [even power of downward pilot time slot-x delta dB, even power of downward pilot time slot+x delta dB]; setting +-x delta dB not over the set maximum threshold; making x from integral increased from 0; gathering the power digital quantity of multi-subframe corresponding to time point; transmitting the power digital quantity into power value; proceeding even calculation for power value to obtain the power detecting value. The invention can gather the power value of time point of even power to approximate downward pilot time slot mostly, which improves the precision of high-power detection.
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to a kind of detection method and device of TD-SCDMA system base-station transmitting power.
Background technology
Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time-Division Synchronization CodeDivision-Multiple-Access) transmitting power of base station can change with the variation of ambient temperature in communication system, and the transmitting power of base station can reduce or raise with respect to anticipating power.If transmitting power is too much lower than anticipating power, can have influence on the coverage of base station; And if transmitting power is too much higher than anticipating power, can cause interference to other base stations.Cross great fluctuation process and affect performance for fear of the transmitting power of base station, generally, base station all can design power calibration system, and periodic monitor is adjusted the transmitting power of radio system, with the transmitting power that ensures base station within desired extent.
The calibration of power of existing time-division synchronous code division multiple access TD-SCDMA system is to obtain current power by power detecting system, and after current power and anticipating power are compared, the numerical-control attenuator of adjusting in radio system regulates gain to complete.
Obviously, the accuracy of power detection has a direct impact the calibration of power.Due to the time-division characteristic of TD-SCDMA system, in all descending time slots of this system, only have the power of descending pilot frequency time slot more stable.Therefore, power detection can only be selected to carry out in the power bracket of descending pilot frequency time slot.The implementation procedure of power detection as shown in Figure 1, is specially:
Transmitter unit 11 transmits to power coupler 12, via sending into power detector 13 after power coupler 12 couplings, radio frequency (the RF of input, Radio Frequency) signal is through power detector 13 detections output analog voltages, this analog voltage is by analog-digital converter 14 (A/D, Analog toDigital) be converted into digital quantity, finally within a descending pilot frequency time slot cycle, select arbitrarily a time point to gather the numeric results of power detection by multipoint control unit (MCU:Multipoint ControllerUnit) or field programmable gate array (FPGA:Field Programmable Gate Array) 15, then this power digital quantity is converted and obtains performance number, by the power of the same time point of repeated detection, performance number is averaged and calculates power.
Obviously, in above-mentioned power detection process, the selection of the time point of collection power detection numeric results is very large for the impact of power detection precision, because prior art is the performance number that gathers any one time point, therefore there is unreliability in choosing of time point, must cause thus power detection to produce larger error.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of detection method and device of TD-SCDMA base station transmitting power, thereby improves the accuracy of power detection.
Another technical problem that the present invention solves is to provide a kind of method of searching time point, finds the time point that approaches descending pilot frequency time slot average power most within a descending pilot frequency time slot cycle, thereby improves the accuracy of power detection.
The technical scheme that realizes the object of the invention is as follows:
A detection method for TD-SCDMA system base-station power, comprises step:
A, within a descending pilot frequency time slot cycle, search base station transmitting power at [descending pilot frequency time slot average power-x Δ dB, descending pilot frequency time slot average power+x Δ dB] interval time point, described ± x Δ dB is no more than the maximum threshold of setting, and x is for starting from scratch and adopting concrete step-length progressive whole number gradually; Described mode of searching is: the value of integer x is increased to 1 since 0 at every turn, until the value of x reaches described maximum threshold; Described Δ dB is some components of setting max threshold average power;
B, gather the power digital quantity of many subframes that described time point is corresponding, be converted to performance number by this power digital quantity, described performance number is averaged and calculates power detection value.
Wherein, described Δ dB is 0.1dB.
Wherein, described maximum threshold be+2.5dB or-2.5dB.
Wherein, gather by root-mean-square value RMS detecting way.
In addition, the invention provides a kind of method of searching time point, within a descending pilot frequency time slot cycle, search base station transmitting power at [descending pilot frequency time slot average power-x Δ dB, descending pilot frequency time slot average power+x Δ dB] interval time point, described ± x Δ dB is no more than the maximum threshold of setting, x is some components of setting max threshold average power for starting from scratch and adopting concrete step-length progressive whole number gradually, described Δ dB.
Wherein, described Δ dB is 0.1dB.
Wherein, described maximum threshold be+2.5dB or-2.5dB.
The checkout gear that the invention provides a kind of TD-SCDMA system base-station power, comprising:
Time point finger, for searching base station transmitting power at [descending pilot frequency time slot average power-x Δ dB within a descending pilot frequency time slot cycle, descending pilot frequency time slot average power+x Δ dB] interval time point, described ± x Δ dB is no more than the maximum threshold of setting, and x is for starting from scratch and adopting concrete step-length progressive whole number gradually; Described mode of searching is: the value of integer x is increased to 1 since 0 at every turn, until the value of x reaches described maximum threshold; Described Δ dB is some components of setting max threshold average power;
Power harvester, for gathering the power digital quantity of many subframes that described time point is corresponding;
Power calculator, for being converted to performance number by this power digital quantity, averaging and calculates power detection value described performance number.
Wherein, described Δ dB is 0.1dB.
Wherein, described maximum threshold be+2.5dB or-2.5dB.
Contrast prior art, beneficial effect of the present invention is summarized as follows:
1, the present invention by finding the time point that approaches descending pilot frequency time slot average power most within a descending pilot frequency time slot cycle, then this time point is carried out the power collecting of many subframes, and then be converted to performance number, described performance number is averaged and calculates power detection value.By this scheme, can increase substantially the accuracy of power detection, and then the actual power maximum that the calibration of power value obtaining and frequency spectrograph measure differs 1.2dB.
2, the present invention is by providing the method for searching time point, first search the time point that power equals described average power, if there is no the time point satisfying condition, continue to search power at [descending pilot frequency time slot average power-1 Δ dB, descending pilot frequency time slot average power+1 Δ dB] interval time point, if still there is not the time point satisfying condition, continue to search power at [descending pilot frequency time slot average power-2 Δ dB, descending pilot frequency time slot average power+2 Δ dB] interval time point, if still there is not the time point satisfying condition, continue the like, extremely till the max threshold scope of setting.Always find by this method a time point that approaches most descending pilot frequency time slot average power, thereby ensure the accuracy of measuring.In addition, adopt this scheme, resource utilization ratio is high, in each descending pilot frequency time slot cycle, only need to process the testing result of of a power detection chip time point, and without multi-point sampling, thus the resource of having saved data Storage and Processings.
3, the present invention is based on power detection chip and adopt RMS detecting way, and very fast to the response time of input signal, can substantially true reflected signal changes in amplitude.In the time realizing, require the module that power detection value is gathered to have accurate timing, can accurately collect the power of desired location.
4, the present invention is convenient and swift in actual applications, applied widely, and all similar systems can find suitable time point by the present invention program, to carry out the collection of power detection.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Fig. 1 is the block diagram of realizing of prior art power detection;
Fig. 2 is detection method flow chart of the present invention;
Fig. 3 is the method flow diagram that the present invention searches time point;
Fig. 4 is checkout gear block diagram of the present invention;
Fig. 5 is embodiment of the present invention test block diagram.
Embodiment
In TD-SCDMA system, have 128 cell scramblings and distinguish different communities, every four scramblers form one group, corresponding a Sync_DL code, totally 32 groups of Sync_DL code words.Descending synchronous code (Sync_DL, synchronous downlink) is 64 predetermined PN sequences of a system, and in the time setting up the community of different scrambling codes, the Sync_DL that send base station has 32 kinds of situations.In system, the Sync_DL of neighbor cell is different, and the Sync_DL of non-conterminous community can be multiplexing.Sync_DL is included in the downlink synchronization slot (DwPTS, downlink pilot time slot) of TD-SCDMA system.
The frame length of a TD_SCDMA system of 3GPP definition is 10ms, the frame of a 10ms can be divided into two identical subframes of structure, the duration of each subframe is 5ms, and each subframe is made up of 3 special time slots and 7 conventional time slots, and in each subframe, the DwPTS duration is 50us.Based on the feature of TD_SCDMA frame structure, the present invention adopts the performance number of the some time points that approaches descending pilot frequency time slot average power most of FPGA collection within a descending pilot frequency time slot cycle as one-time detection value, the method of carrying out averaging after the detection of many subframes at this point is again carried out power detection, and ensures that this time point is applicable to the descending pilot frequency time slot of all descending pilot frequency code words.
The detection method of TD-SCDMA system base-station power of the present invention, as shown in Figure 2, comprising:
Step 1, within a descending pilot frequency time slot cycle, search a time point that approaches descending pilot frequency time slot average power most;
Step 2, gather the power digital quantity of many subframes that described time point is corresponding, be converted to performance number by this power digital quantity, described performance number is averaged and calculates power detection value.
As shown in Figure 3, described time point obtains by following steps:
Step 101, search power and equal the time point of descending pilot frequency time slot average power, if there is the time point satisfying condition, enter step 102; Otherwise enter step 103;
Step 102, export this time point;
Step 103, search power at [descending pilot frequency time slot average power-1 Δ dB, descending pilot frequency time slot average power+1 Δ dB] interval time point, if there is the time point satisfying condition, enter step 104; Otherwise enter step 105;
Step 104, export this time point;
Step 105, search power at [descending pilot frequency time slot average power-2 Δ dB, descending pilot frequency time slot average power+2 Δ dB] interval time point, if there is the time point satisfying condition, enter step 106;
Otherwise enter step 107;
Step 107, the like, extremely till max threshold scope.
The following describes 3GPP 25.142 agreements in the suggestion of TD-SCDMA system base-station uniformity test, to the relevant regulations of base station peak power output, that is:
Under normal circumstances, base station peak power output will be within nominal power output ± 2dB of manufacturer;
Under extreme case, within nominal power output ± 2.5dB of base station peak power output straw cord for bundling up rice or wheat stalks manufacturer;
Consider the uncertainty that test macro brings, under normal circumstances, base station peak power output is within ± 2.7dB;
Consider the uncertainty that test macro brings, under extreme case, base station peak power output is within ± 3.2dB;
Normal conditions refer to proper testing environment, and its condition limit value is as shown in table 1:
Table 1
Relevant regulations in the extreme test environment that extreme case proposes about TD-SCDMA system base-station uniformity test suggestion 5.9.2 according to 3GPP 25.142 agreements is carried out.
Therefore, maximum threshold of the present invention is ± 2.5dB.Described Δ dB can be 0.1dB, 0.2dB etc. according to actual conditions.
As shown in Figure 4, be checkout gear block diagram of the present invention, wherein:
First, within a descending pilot frequency time slot cycle, searched a time point that approaches descending pilot frequency time slot average power most by time point finger 41;
Then, gathered the power digital quantity of many subframes that described time point is corresponding by power harvester 42;
Finally, by power calculator 43, described power digital quantity is converted to performance number, described performance number is averaged and calculates power detection value, as subsequent treatment.
Wherein, described time point is obtained by following steps by time point finger 41:
A1, search power and equal the time point of descending pilot frequency time slot average power, if there is the time point satisfying condition, finish; Otherwise continue;
A2, search power at [descending pilot frequency time slot average power-1 Δ dB, descending pilot frequency time slot average power+1 Δ dB] interval time point, described Δ dB is some components of setting max threshold average power, if there is the time point satisfying condition, finishes; Otherwise continue;
A3, search power at [descending pilot frequency time slot average power-2 Δ dB, descending pilot frequency time slot average power+2 Δ dB] interval time point, if there is the time point satisfying condition, finish; Otherwise continue the like, extremely till max threshold average power.
Described max threshold average power is average power ± 2.5dB; Described Δ dB can be 0.1dB, 0.2dB etc. according to actual conditions.
Illustrate the specific implementation process of technical solution of the present invention below.
In the signal emission process of TD-SCDMA system, baseband digital signal is through Digital IF Processing, Sync_DL baseband digital signal waveform after RRC forming filter can change, cause the Sync_DL that the launches waveform in time domain to occur fluctuation, and the fluctuation pattern of different code words is not identical.The wave form varies of descending pilot frequency time slot code word mainly results from the forming filter in emission process.By using descending pilot frequency time slot code word in Matlab software emulation TD-SCDMA system, the waveform after forming filter can be verified this point theoretically.
The condition of simulation software and that TD_SCDMA system is actual is in full accord while realizing: interleaving 0 in SYNC_DL code, carry out after 60 times of interpolation, through 59 rank forming filters, after data and filter convolution, both sides cut out the half of filter length, and length is exactly 64*60=3840 (1/60chip sampling).
By the analysis to emulated data, although find that 32 sync_DL code words all exist the rule of fluctuation and fluctuation not identical after the RRC of digital intermediate frequency processes, and always have the power of some points to equal average power or approach average power.So, adopt the lookup scheme of time point of the present invention, the i.e. RRC Wave data after treatment through digital intermediate frequency by 32 groups of sync_DL code words of software analysis, find a time point, make on this time point, the power of 32 sync_DL code words is all close to the average power content of whole code word.
Detailed process is:
(1) in 3840 sampled points of the simulation waveform of all 32 sync_DL code words, adopt software analysis to search power and equal the time point of average power, then analytic statistics result, whether there is the time point satisfying condition in same position for all code words, if there is the time point satisfying condition, can use in these time points any one as the collection position of power detection result; Otherwise continue;
(2) if do not meet the time point of above condition, loosen condition, in the descending pilot frequency time slot waveform of all 32 snyc_D1 code words, search power at [descending pilot frequency time slot average power-0.1dB, descending pilot frequency time slot average power+0.1dB] interval time point, if there is the time point satisfying condition, can use in these time points any one as the collection position of power detection result; Otherwise continue;
The like, be set to ± 2.5dB of the maximum threshold of inquiry.
(3) through to data analysis, find 127 time points and all meet average power ± 2dB for all code words, specifically as shown in table 2:
Table 2:
Select any point in 127 points acquisition time as power detection result, the result and the actual deviation that just can guaranteed output detect are no more than 2dB, have ensured the precision of the calibration of power.
Carried out demonstration test for the time point finding, the time point of choosing in experiment is the moment of subframe middle distance frame head 716.484us.
Test environment is as shown in Figure 5: in test, use the micro-base station 51 of single carrier, set up full power community, Dwpts Power=30dBm, Pccpch Power=30dBm, all power measurement values are used the code domain power measurement pattern of frequency spectrograph 53, measure two code channel transmitting powers of Primary Common Control Physical Channel (Pccpch, primary commoncontrol physical channel).When measurement, attenuator 52 will be selected suitable pad value, to prevent the overload of frequency spectrograph.
Result after existing scheme and power of the present invention are adjusted is more as shown in table 3, the result of corresponding all 32 Sync_DL code words after using existing scheme while having listed power control in table 3 and adopting the present invention program.Anticipating power is 30dBm, can find out that same hardware system adopts the performance number of existing project setting and the maximum deviation of anticipating power to reach 5.3dB, and the result that power deviation is greater than 1dB has accounted for institute resultful 65.625%.Adopting the performance number of this programme adjustment and the maximum deviation of anticipating power is 1.2dB, and 90.625% result error is less than 1dB, substantially approaches anticipating power.
Table 3:
| Code word (dB) | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| Result after the adjustment of existing scheme power | 32.2 | 30.1 | 29.7 | 32.1 | 27.2 | 34.3 | 30.3 |
| Result after the adjustment of the present invention program's power | 29 | 29.7 | 29.7 | 30.6 | 30.5 | 29 | 29.5 |
| Code word | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Result after the adjustment of existing scheme power | 29 | 28.6 | 30.5 | 27 | 34.6 | 32.1 | 28.1 |
| Result after the adjustment of the present invention program's power | 29.1 | 29.8 | 29.6 | 30.3 | 30.5 | 29.5 | 29.7 |
| Code word | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Result after the adjustment of existing scheme power | 32 | 27.9 | 28.3 | 32.1 | 32.3 | 35.3 | 30.5 |
| Result after the adjustment of the present invention program's power | 28.8 | 28.8 | 29.8 | 30.4 | 28.9 | 29.4 | 29.5 |
| Code word | 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| Result after the adjustment of existing scheme power | 27.9 | 30.3 | 30.7 | 27.3 | 30.5 | 25.8 | 30.4 |
| Result after the adjustment of the present invention program's power | 29.4 | 29.5 | 30.1 | 29.4 | 30 | 30.2 | 29.4 |
| Code word | 28 | 29 | 30 | 31 | |||
| Result after the adjustment of existing scheme power | 32.2 | 29.1 | 32.1 | 35.3 | |||
| Result after the adjustment of the present invention program's power | 29.9 | 29.9 | 29.8 | 29.8 |
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any any amendment of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (7)
1. a detection method for TD-SCDMA system base-station power, is characterized in that, comprises step:
A, within a descending pilot frequency time slot cycle, search base station transmitting power at [descending pilot frequency time slot average power-x △ dB, descending pilot frequency time slot average power+x △ dB] interval time point, described mode of searching is: the value of integer x is increased to 1 since 0 at every turn, until the value of x △ dB reaches maximum threshold; Described △ dB is 0.1dB or 0.2dB;
B, gather the power digital quantity of many subframes that described time point is corresponding, be converted to performance number by this power digital quantity, described performance number is averaged and calculates power detection value.
2. detection method as claimed in claim 1, wherein, described maximum threshold is 2.5dB.
3. detection method as claimed in claim 2, wherein, gathers by root-mean-square value RMS detecting way.
4. search the method for time point for one kind, it is characterized in that, within a descending pilot frequency time slot cycle, search base station transmitting power at [descending pilot frequency time slot average power-x △ dB, descending pilot frequency time slot average power+x △ dB] interval time point, described mode of searching is: the value of integer x is increased to 1 since 0 at every turn, until the value of x △ dB reaches maximum threshold, described △ dB is 0.1dB or 0.2dB.
5. method as claimed in claim 4, wherein, described maximum threshold is 2.5dB.
6. a checkout gear for TD-SCDMA system base-station power, is characterized in that, comprising:
Time point finger, for searching base station transmitting power at [descending pilot frequency time slot average power-x △ dB within a descending pilot frequency time slot cycle, descending pilot frequency time slot average power+x △ dB] interval time point, described mode of searching is: the value of integer x is increased to 1 since 0 at every turn, until the value of x △ dB reaches maximum threshold; Described △ dB is 0.1dB or 0.2dB;
Power harvester, for gathering the power digital quantity of many subframes that described time point is corresponding;
Power calculator, for being converted to performance number by this power digital quantity, averaging and calculates power detection value described performance number.
7. checkout gear as claimed in claim 6, wherein, described maximum threshold is 2.5dB.
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| CN101771458B (en) * | 2008-12-30 | 2013-07-24 | 大唐移动通信设备有限公司 | Overpower protection method and device of far-end radio-frequency system of base station |
| CN101719801B (en) | 2009-11-25 | 2013-01-16 | 中兴通讯股份有限公司 | Method and system for realizing power detection |
| ES2709829T3 (en) | 2014-03-31 | 2019-04-17 | Nokia Solutions & Networks Oy | Uplink access with compressed mode in a communication network system |
| CN108462539A (en) * | 2018-02-09 | 2018-08-28 | 海能达通信股份有限公司 | Means for anti-jamming, method, communication terminal and the storage medium of communication terminal |
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| EP1460778A2 (en) * | 2003-03-07 | 2004-09-22 | Ubinetics Limited | Transmit power control |
| CN1627656A (en) * | 2003-12-08 | 2005-06-15 | 华为技术有限公司 | Equipment and method for stabilizing output power in base station |
| CN1649276A (en) * | 2004-01-30 | 2005-08-03 | 三星电子株式会社 | Method and apparatus for compensating phase errors in a base station |
| EP1478111B1 (en) * | 2003-05-14 | 2010-03-03 | UbiNetics (VPT) Limited | Transmission power calibration |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1460778A2 (en) * | 2003-03-07 | 2004-09-22 | Ubinetics Limited | Transmit power control |
| EP1478111B1 (en) * | 2003-05-14 | 2010-03-03 | UbiNetics (VPT) Limited | Transmission power calibration |
| CN1627656A (en) * | 2003-12-08 | 2005-06-15 | 华为技术有限公司 | Equipment and method for stabilizing output power in base station |
| CN1649276A (en) * | 2004-01-30 | 2005-08-03 | 三星电子株式会社 | Method and apparatus for compensating phase errors in a base station |
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