CN1697530A - Method and system for optimizing automatic power control - Google Patents
Method and system for optimizing automatic power control Download PDFInfo
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- CN1697530A CN1697530A CN 200410044463 CN200410044463A CN1697530A CN 1697530 A CN1697530 A CN 1697530A CN 200410044463 CN200410044463 CN 200410044463 CN 200410044463 A CN200410044463 A CN 200410044463A CN 1697530 A CN1697530 A CN 1697530A
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Abstract
The invention relates to automatic power control (APC) technique in global mobile communication system. The method and system makes power output curve of BTS fit to ideal curve better. Before generating APC template, the disclosed method and system carried out linear detection for curve of output power - control voltage when power amplifier is in open loop in order to guarantee that slopes of connecting line between each two adjacent points on the curve are within specified range. An independent template is adopted for each grade of power at each frequency point in the system, and simplified method for generating these templates is forwarded in the invention.
Description
Technical field
The present invention relates to the automated power control technology in the global system for mobile communications, particularly the automated power control template in the global system for mobile communications is generated the technology that is optimized.
Background technology
Global system for mobile communications (Global System for mobile Communication, be called for short " GSM "), develop the end of the eighties for Europe, be with for mobile telephone system based on second of numeral, it is one of the most ripe digital mobile telephone network network standard in the whole world, with mainly be arrowband time division multiple access (Time DivisionM ultiple Access, be called for short " TDMA ") technology, non-voice service and comprehensive voice, literal and data service can be provided, and some value-added services such as Short Message Service, voice mail, calling transfer etc. are provided.
GSM communicates by base station transceiver (Base Transceiver Station is called for short " BTS ") and travelling carriage (Mobile Station is called for short " MS ").In order to make the data of communication to transmit exactly, very crucial a bit is the automated power control (Automatic PowerControl is called for short " APC ") of BTS.As shown in Figure 1, in gsm protocol, require power-time (Po-t) curve of base station conventional burst Burst (pulse) should be in the zone between two shades.Curve among Fig. 1 is a typical curve that meets this requirement, and this curve can be divided into 3 sections (11,12 and 13) according to the time, and curved section 11 is power ascending curves, and desirable power ascending curve can be simulated with raised cosine curve.Because the power instability, so the data that BTS sends in this section generally are out of use.Curved section 12 is power stable state parts, and desirable power stable state partly is the straight line of a level, represents power output to keep constant.This section approximately can transmit the useful data of 147 bits (bit).Curved section 13 is power decline curves, and desirable power decline curve can be with falling the cosine curve simulation.Because power is also unstable, so the data that send in this section generally also are out of use.
In order to make BTS to carry out power output according to the regulation in the gsm protocol, generally can adopt the design that is similar to Fig. 2, constitute by address generator 21, APC data storage 22, D/A module 23, integrator 24, power amplifier 25 and testing circuit 26 to the part of the APC among the BTS.
D/A module 23 is used for handle and is converted to the voltage signal Vapc of simulation from the data (digital signal) of APC data storage 22, and Vapc is delivered to first port of integrator 24.
In order to realize the function of APC, need carry out following steps:
At first, determine a desirable power curve of output Po-t (as shown in Figure 1).This curve can satisfy the desirable carrier power/temporal envelope of GSM time domain agreement, and represents with the form of time domain.
Secondly, measure power output-control voltage (Po-Vc) curve of power amplifier 25.This class of a curve is similar to curve shown in Figure 3.Power amplifier 25 just is not provided with the feedback loop of 24 second ports from testing circuit 26 to integrator according to the open loop approach setting during measurement.
At last, obtain corresponding control voltage Vapc curve according to power curve of output (Po-t) and the Po-Vc curve calculation that records.This Vapc curve is made of the magnitude of voltage of a sequence, each magnitude of voltage Vapc[i in this sequence] (i is an integer, represent the sequence number of this numerical value in whole sequence) the performance number Po[i of a corresponding expection], wish by exporting Vapc[i successively to integrator 24] and make that the power output of power amplifier 25 is consistent with desirable power curve of output Po-t.Vapc[i] be kept in the APC data storage 22 the data Vapc[i that is saved] being called as " template ", the operation of this generation and preservation template is called " burning mould ".
During use, address generator 21 sends an address every a time interval to APC data storage 22, preserves each magnitude of voltage Vapc[i of Vapc curve in the memory cell in the pairing APC data storage 22 in these addresses successively].When the address of APC data storage 22 bases from address generator 21, export a predetermined voltage Vapc[i by D/A module 23 to integrator 24] after, if power amplifier 25 current output power Po are less than the power P o[i of expection], then because the power output-control voltage curve of power amplifier 25 satisfies the monotonically increasing linear relationship, this moment, detecting circuit Vf was also less than Vapc[i], the output voltage V c of integrator 24 rises, cause the output voltage Po of power amplifier 25 also to rise, when Po rises to Po=Po[i] time, Vf=Vapc[i], it is stable that Vc keeps, and Po also is stabilized in Po[i].When the address of APC data storage 22 bases from address generator 21, export a predetermined voltage Vapc[i by D/A module 23 to integrator 24] after, if power amplifier 25 current output power Po are greater than the power P o[i of expection], then because the power output-control voltage curve of power amplifier 25 satisfies the monotonically increasing linear relationship, this moment, detecting circuit Vf was also greater than Vapc[i], the output voltage V c of integrator 24 descends, cause the output voltage Po of power amplifier 25 also to descend, when Po drops to Po=Po[i] time, Vf=Vapc[i], it is stable that Vc keeps, and Po also is stabilized in Po[i].
Can know by top analysis, as long as the template in the APC data storage 22 is correct, the ideal power curve of output Po-t that can be designed in advance in theory.
In addition, may have different power grades at the BTS of reality each frequency when working.
The representation of power grade be (M, N), wherein M, N are the non-zero positive integers, for example (0,0), (5,10) etc., M represents rate of static power, generally do not change, N is the dynamic power grade, can be along with the quality and the level of wireless signal in the communication process are dynamically adjusted.It is corresponding that present each frequency has a template, but different power grades are shared same template.
In actual applications, there is following problem in such scheme: find to have two problems in the test of BTS:
Problem one, real output are sometimes than design load about low or high 0.2dB;
Problem two, under some power grades power curve of output Po-t and ideal curve not in full conformity with.
The reason that causes problem one is that power-control voltage (Po-Vc) the curve linear degree of power amplifier 25 is bad.Fig. 4 shows the actual curve of a power amplifier Po-Vc, and in order to say something, the ratio of this root line has suitably been amplified.Four round dots (91,92,93,94) among the figure are represented four data points of actual acquisition, and curve 99 is represented actual Po-Vc curve.Line segment between data point 93 and 94 is amplified once more the result that can obtain as Fig. 5.Because our data point collection can not unrestrictedly be encrypted, therefore be merely able to obtain several discrete points, and for can be according to power curve of output Po-t power output, needed Vapc is not probably in the set of discrete point, therefore adopt approach based on linear interpolation usually, suppose that promptly the Po-Vc curve between per two points is a straight line, the straight line among Fig. 5 98 for example, Shu Chu Po value is sought due Vapc value on straight line 98 as required, suppose it is the dotted line among Fig. 5 and the intersection point of straight line 98, the Vc coordinate of this intersection point is exactly the Vapc value that finds by linear interpolation.But the real corresponding power output Po of this Vapc value is the ordinate of the intersection point of curve 99 and dotted line.On ordinate, previous intersection point just means also that greater than a back intersection point actual power output can be lower than ideal value.Those of ordinary skill in the art can know that similarly reason also may make actual power output be higher than ideal value.
The reason that causes problem two is to have adopted same template to remove to deal with all power grades.In fact, power amplifier 25 Po under different power grades has some differences to the response of Vapc, as shown in Figure 6, solid line 81 among the figure, solid line 82 and dotted line are represented under three kinds of power grades the actual Po-t curve when adopting same template respectively, wherein dotted line and desirable tracing pattern meet better, and the Po-t curve has some and do not wish the variation that occurs during other power grades.This changes maximum problem is to make the power stable state of Po-t curve partly produce fluctuation.Present technical scheme has been ignored this variation, has therefore caused problem two.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of automated power Control and Optimization method and system thereof, makes the power curve of output of BTS and ideal curve coincide better.
For achieving the above object, the invention provides a kind of automated power Control and Optimization method, be used for the automated power control of base station transceiver, comprise following steps: A measures the power-control voltage curve of power amplifier; C generates automated power control voltage template, and between described steps A and C, described method also comprises following steps:
B calculates in described power-control voltage curve the slope of line between per two consecutive number strong points, judges that all slopes whether all between predefined upper and lower threshold value, if then enter step C, otherwise abandon this power amplifier.
Wherein, described power-control voltage curve is under the condition of described power amplifier open loop, keeps input power constant, obtains by the power of measuring described power amplifier output under the different control voltages.
Described step B also further comprises following substep:
B1 reads first data point of described power-control voltage curve;
B2 reads the next data point of described power-control voltage curve;
B3 calculates the slope between current data point and the previous data point, and judges that this slope whether between predefined upper and lower threshold value, if then enter step B4, otherwise enters step B5;
B4 judges whether to also have remaining data point, if then enter step B2, otherwise judges that described power amplifier is qualified, enters step C;
B5 judges that described power amplifier is defective.
Described automated power control voltage template is kept in the automated power control data memory.
Described upper and lower threshold value can be kept in the configuration file in advance.
The present invention also provides a kind of automated power Control and Optimization system, be used for the automated power control of base station transceiver, each power grade to each frequency in the described system all has independently automated power control voltage template, and this template is used for control power amplifiers and produces burst.
Wherein, the automated power of described each power grade control voltage template is on the basis as the automated power control voltage template of benchmark, will multiply by a coefficient as the data of the power ascending curve section of the automated power control voltage template of benchmark and obtain.
By relatively finding, technical scheme difference with the prior art of the present invention is, Po-Vc curve before generating the APC template during to the power amplifier open loop carries out linearity test, guarantees on this curve that the slope of line is in prescribed limit between per two consecutive number strong points.
Each power grade to each frequency in system all adopts an independently template, and has proposed to generate the short-cut method of these templates.
Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly by in advance power amplifier being carried out linearity test, before " burning mould ", detected underproof power amplifier, therefore can make each BTS can both reach the power of design, improved quality, significantly reduced the ratio of defects of BTS system, saved because maintenance and doing over again and the subsequent handling workload that causes.
In addition, by each power grade is set independently template, make the power curve of output of power amplifier can both reach or near the ideal power curve of output at each power grade of each frequency, the power stable state part that has guaranteed the power curve of output can meet designing requirement, has improved the communication quality of BTS.
Description of drawings
Fig. 1 is the power-temporal envelope schematic diagram of the desirable carrier wave of gsm protocol regulation;
Fig. 2 is the structural representation of APC equipment in the gsm system;
Fig. 3 is that Po-Vc concerns schematic diagram;
Fig. 4 is the actual curve schematic diagram of a power amplifier Po-Vc;
Fig. 5 is the not enough analyzing chart for reason of power output;
Fig. 6 is the Po-t curve synoptic diagram under the different capacity grade;
Fig. 7 is power amplifier linearity testing process figure according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
In a preferred embodiment of the present invention, behind power output when recording power amplifier 25 open loops-control voltage (Po-Vc) curve, be saved in APC data storage 22 (" burning mould ") before at calculation control voltage Vapc curve and with result of calculation, increased a detection operation power amplifier 25.Can the linear degree that this operation is used for the Po-Vc curve of detection power amplifier 25 meet design requirement, and concrete flow process as shown in Figure 7.
In step 110, read first data point of Po-Vc curve.Each data point of Po-Vc curve comprises two paired data, and one is the Vc value, and another is the corresponding Po value of this Vc value.
After this enter step 120, read the next data point of Po-Vc curve.
After this enter step 130, calculate the slope of line between current data point and the previous data point.If current data point is labeled as (Vc[i], Po[i]), then previous data point can be labeled as (Vc[i-1], Po[i-1]), and wherein i is the positive integer between 1 to N, and N is the total number of data point on the Po-Vc curve.The slope K [i] of line can be calculated by following formula between current data point and the previous data point: K[i]=(Po[i]-Po[i-1])/(Vc[i]-Vc[i-1]).
After this enter step 140, judge that slope K [i] whether on two of regulation between the lower threshold value, if then enter step 150, otherwise enters step 160.Here go up lower threshold value for two that mention and in system, pre-define, represented the slope upper limit and the slope lower limit that to tolerate respectively.In a preferred embodiment of the present invention, going up lower threshold value for two can set in advance in system by configuration file.
In step 150, judge whether to also have remaining data point, if having then enter step 120, read next data point and handle, otherwise enter step 170, point out this linearity of amplifier qualified.
In step 160, point out this power amplifier linearity sub-standard, withdraw from flow process.If have at least the slope between a pair of consecutive number strong point not meet the demands in step 140 li discovery Po-Vc curve, then this power amplifier 25 can not be used among the BTS.Can point out operating personnel this moment by human-computer interaction interface, for example can pass through display or printer output literal warning message, can also export the data point parameter that goes wrong together simultaneously.
Adopt after the above detection operation, be similar to Po-Vc curve shown in Figure 4 if run into again, then the slope between the data point 92 and 93 can be judged as defectively, so this power amplifier just can not be used among the BTS and do not go.Because before " burning mould " operation, just detected underproof power amplifier in advance, therefore can significantly reduce the defect rate of BTS system, saved a large amount of unnecessary follow-up work amounts.
In another scheme of the present invention, APC equipment in the prior art has as shown in Figure 2 been done improvement, in APC data storage 22, each power grade has all been preserved a template, the unfavorable place of doing like this is the requirement that has increased memory span, thereby can cause the increase on some costs.But along with in recent years science and technology develop rapidly, the price straight line of memory descends, and capacity is multiplied, and the cost that therefore causes thus increases and be few, becomes possibility but make the power curve of output of each power grade all meet the ideal power curve of output thus.
Increased after the template number, conventional idea is all to measure the Po-Vc curve of power amplifier 25 under each power grade, calculates corresponding template then and writes in the APC data storage 22.Because power grade is many, each power grade of each power amplifier measured can cause workload to increase by one more than the order of magnitude, inadvisable.
The present invention utilizes the similar characteristics of the Po-Vc curve ratio of same power amplifier different capacity grade, after formerly obtaining a template (hereinafter being called " benchmark template ") under the reference power grade, the template of other power grades obtains by the benchmark template is made amendment.The method of revising is as follows:
Only revise the power ascending curve (as the curved section among Fig. 1 11) of benchmark template, the data of power ascending curve in the benchmark template are all unified to take advantage of a coefficient A, A is one about 1 a positive number.For each power grade, A is by the test of reality and adjusts and determine.Be that example illustrates that to some power grades be numerical value how to determine A below with Fig. 6.Suppose that the dotted line among Fig. 6 represents the benchmark template, then the solid line among Fig. 6 81 and 82 represent respectively two kinds at different power grade lower bolsters may forms.If find it is the form that is similar to solid line 81 through test, then should reduce A, if find it is the form that is similar to solid line 82, then should increase A through test.By adjusting repeatedly, when adjusting to the power stable state and partly be a straight line, just can obtain only coefficient A under this power grade.The coefficient A that obtains under some power grades for a power amplifier can be used as the reference value of the coefficient A under the same kind power amplifier equal-wattage grade.
Need to prove that the present invention does not remove to adjust the power decline curve in the template, this is because the signal of this part is not a useful signal, and it doesn't matter to produce some variations.And the power decline curve is positioned at the last of whole template, can not the curve of back be exerted an influence.The power ascending curve then may partly exert an influence to follow-up power stable state, therefore becomes the object that the present invention adjusts.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (7)
1. an automated power Control and Optimization method is used for the automated power control of base station transceiver, and comprise following steps: A measures the power-control voltage curve of power amplifier; C generates automated power control voltage template, it is characterized in that between described steps A and C, described method also comprises following steps:
B calculates in described power-control voltage curve the slope of line between per two consecutive number strong points, judges that all slopes whether all between predefined upper and lower threshold value, if then enter step C, otherwise abandon this power amplifier.
2. automated power Control and Optimization method according to claim 1, it is characterized in that, described power-control voltage curve is under the condition of described power amplifier open loop, keeps input power constant, obtains by the power of measuring described power amplifier output under the different control voltages.
3. automated power Control and Optimization method according to claim 1 is characterized in that, described step B also further comprises following substep:
B1 reads first data point of described power-control voltage curve;
B2 reads the next data point of described power-control voltage curve;
B3 calculates the slope between current data point and the previous data point, and judges that this slope whether between predefined upper and lower threshold value, if then enter step B4, otherwise enters step B5;
B4 judges whether to also have remaining data point, if then enter step B2, otherwise judges that described power amplifier is qualified, enters step C;
B5 judges that described power amplifier is defective.
4. automated power Control and Optimization method according to claim 1 is characterized in that, described automated power control voltage template is kept in the automated power control data memory.
5. automated power Control and Optimization method according to claim 1 is characterized in that described upper and lower threshold value can be kept in the configuration file in advance.
6. automated power Control and Optimization system, be used for the automated power control of base station transceiver, it is characterized in that each power grade to each frequency in the described system all has independently automated power control voltage template, this template is used for control power amplifiers and produces burst.
7. automated power Control and Optimization according to claim 6 system, it is characterized in that, the automated power of described each power grade control voltage template is on the basis as the automated power control voltage template of benchmark, will multiply by a coefficient as the data of the power ascending curve section of the automated power control voltage template of benchmark and obtain.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101227699B (en) * | 2008-02-19 | 2010-12-08 | 华为技术有限公司 | Method and system for distributing resource for reverse class users and communication equipment |
| CN101938258A (en) * | 2010-08-27 | 2011-01-05 | 华为终端有限公司 | Method and device for controlling radio frequency power amplifier to transmit signal |
| WO2011131155A2 (en) * | 2011-06-09 | 2011-10-27 | 华为技术有限公司 | Method and device for compensating power according to frequency |
| US8792931B2 (en) | 2009-02-26 | 2014-07-29 | Huawei Technologies Co., Ltd. | Method, apparatus and system for controlling carrier power amplifier of base station |
| CN104349436A (en) * | 2013-08-07 | 2015-02-11 | 联芯科技有限公司 | Method and device for automatically acquiring automatic power control codewords |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100357619B1 (en) * | 1998-06-23 | 2003-01-15 | 삼성전자 주식회사 | Output power control device and method of mobile communication terminal |
| US6366177B1 (en) * | 2000-02-02 | 2002-04-02 | Tropian Inc. | High-efficiency power modulators |
| US6985751B2 (en) * | 2002-03-07 | 2006-01-10 | Siemens Communications, Inc. | Combined open and closed loop power control with differential measurement |
| US6646501B1 (en) * | 2002-06-25 | 2003-11-11 | Nortel Networks Limited | Power amplifier configuration |
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| CN101227699B (en) * | 2008-02-19 | 2010-12-08 | 华为技术有限公司 | Method and system for distributing resource for reverse class users and communication equipment |
| US9331876B2 (en) | 2009-02-26 | 2016-05-03 | Huawei Technologies Co., Ltd. | Method, apparatus and system for controlling carrier power amplifier of base station |
| US8792931B2 (en) | 2009-02-26 | 2014-07-29 | Huawei Technologies Co., Ltd. | Method, apparatus and system for controlling carrier power amplifier of base station |
| WO2012025066A1 (en) * | 2010-08-27 | 2012-03-01 | 华为终端有限公司 | Method and device for controlling signal transmission of radio frequency power amplifier |
| CN101938258B (en) * | 2010-08-27 | 2013-06-05 | 华为终端有限公司 | Method and device for controlling radio frequency power amplifier to transmit signal |
| US8909179B2 (en) | 2010-08-27 | 2014-12-09 | Huawei Device Co., Ltd. | Method and apparatus for controlling transmit signal of radio frequency power amplifier |
| CN101938258A (en) * | 2010-08-27 | 2011-01-05 | 华为终端有限公司 | Method and device for controlling radio frequency power amplifier to transmit signal |
| WO2011131155A2 (en) * | 2011-06-09 | 2011-10-27 | 华为技术有限公司 | Method and device for compensating power according to frequency |
| WO2011131155A3 (en) * | 2011-06-09 | 2012-05-03 | 华为技术有限公司 | Method and device for compensating power according to frequency |
| CN104349436A (en) * | 2013-08-07 | 2015-02-11 | 联芯科技有限公司 | Method and device for automatically acquiring automatic power control codewords |
| CN104349436B (en) * | 2013-08-07 | 2017-12-19 | 联芯科技有限公司 | The automatic obtaining method and device of automated power control code word |
| CN106973449A (en) * | 2017-03-28 | 2017-07-21 | 广东美的厨房电器制造有限公司 | Poewr control method, device and semiconductor microwave firing equipment |
| CN106973449B (en) * | 2017-03-28 | 2020-07-24 | 广东美的厨房电器制造有限公司 | Power control method and device and semiconductor microwave heating equipment |
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