CN101304270B - Method for implementing APC quick accurate calibration - Google Patents
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- CN101304270B CN101304270B CN2007100404819A CN200710040481A CN101304270B CN 101304270 B CN101304270 B CN 101304270B CN 2007100404819 A CN2007100404819 A CN 2007100404819A CN 200710040481 A CN200710040481 A CN 200710040481A CN 101304270 B CN101304270 B CN 101304270B
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Abstract
The invention discloses a realizing method of the rapid and accurate calibration of APC, adopting a PC, a terminal and a power measuring device. The method comprises the following steps: step 1: the PC starts the power measuring device to begin the measuring and informs the terminal to transmit signals; step 2: the terminal transmits the signals to the power measuring device and every sub frame of a digital base band changes the APC control words; step 3: after the terminal finishes the transmission according to the control words, the PC takes out the corresponding power values from the power measuring device one time when transmitting according to the control words, picks out the control words corresponding to the required power values, thus finishing the power calibration. The method of the invention makes full use of the power measuring device which has the properties of storing a plurality of measuring results, rapidly acquires the transmission power corresponding to a plurality of control words one time and obtains the control words corresponding to the required transmission power, thus improving the calibration accuracy and speed.
Description
Technical field
The present invention relates to the radio-frequency emission power control method in a kind of radio communication, relate in particular to the implementation method that a kind of APC (Automatic Power Control, automated power control) accurately calibrates fast.
Background technology
Base station and terminal are to prevent other users' interference and reduce power consumption and all can carry out power control in the mobile communication, and according to protocol requirement in the mobile communication, the emitting power grade on all channels all must satisfy code requirement.In the mobile phone communication process, the base station will be adjusted the power output of mobile phone in real time like this.Given this, must carry out the calibration of power, the accurate power calibration could correct, real-time adjustment transmitting power reach the purpose that power is controlled.Simultaneously accurate transmitting power has also avoided adjustment power bigger than normal, helps the reduction of mobile phone end power consumption.
For reaching this code requirement, common practices is that first each power grade with intermediate channels is calibrated in the critical field, and all the other channels are calibrated through the way of channel compensation then, such as realizing through the way that multiply by a corresponding coefficient.
Because the power amplifier characteristic of each producer has nothing in common with each other, different such as technology and backing material have the difference of silicon, GaAs (GaAs) and CMOS (complementary metal oxide semiconductors (CMOS)) etc.; Also has the difference of power control mode, like Current Control, voltage control and power control or the like; The input voltage of each power amplifier and different batches-characteristics of output power curve is all very different; For these reasons, each sheet power amplifier all needs calibration.With voltage-power control mode; Mobile phone end can be adjusted the control word of digital baseband part; This control word converts the transmitting power that voltage is controlled radio-frequency head into through DAC (digital to analog converter), and calibration process is exactly to look for the process that all require the corresponding control word of transmitting power so.Consider that voltage-power characteristic is roughly the same, just have skew in various degree, this just makes that calibration becomes possibility.
At present, the calibration of power generally adopts two-point method, single-point method and point by point method.
The specific practice of two-point method and single-point method is: after calibrating out the corresponding control word of 1 or 2 transmission power levels, go out the function corresponding relation of performance number and control word according to curve fit, calculated the control word of other performance numbers correspondences again by this function.When performance number and control word fitted like a glove this curve, this kind calibration steps was comparatively simple, fast, but in the reality physical characteristic of radio-frequency devices fully therewith curve match, cause according to said method calibrating approximate that the result that obtains can only be as roughly.
The original intention of point by point method calibration is exactly to want to avoid said method to calibrate the error of bringing; Way is whenever to wish to get the control word that a performance number is just adjusted baseband portion times without number; Till finding the corresponding control word of transmitting power therewith; Traveling through all like this needs the emitted power value to obtain the control word corresponding with each transmission power level, thereby accomplishes calibration.The problem of obvious this method is: constantly attempt being provided with of control word and obtain a certain transmitting power, lose time, efficient is lower.
Summary of the invention
The technical problem that the present invention will solve provides the implementation method that a kind of APC accurately calibrates fast, improves present two-point method and single-point method calibration accuracy, improves the calibration speed of present point by point method.
In order to solve the problems of the technologies described above; The implementation method that the present invention provides a kind of APC accurately to calibrate fast adopts PC (personal computer), terminal and power measuring, comprises the steps: the first step; PC starting power tester begins test, and the notice terminal transmits; In second step, the terminal transmits to power measuring, and wherein each subframe of digital baseband changes the APC control word; In the 3rd step, PC wait terminal is by after all control word battery has fireds, and disposable performance number of from power measuring, taking out correspondence when pressing these control word emissions is picked out the corresponding control word of power demand value, thereby accomplished the calibration of power.
In second step; Described each subframe changes the APC control word and specifically comprises: first subframe of digital baseband is sent power with control word word0; Next subframe is sent power to control word by the minimum step increase, and each subframe all progressively increases by minimum step and sends power later on.
Said each subframe changes the APC control word, according to the minimum measuring period of power measuring, changes the APC control word.
Described minimum step is a bit or dibit or tribit stepping.
Described power measuring carries out power measurement through the closed power control range being divided into two less dynamic ranges.
Described power measurement instruments can be stored multiframe transmitting power measurement result.
Compare with prior art; The present invention has following beneficial effect: make full use of the power measuring with a plurality of measurement result characteristics of storage; The disposable corresponding transmitting power of a plurality of control words that gets access to fast; Obtain the corresponding control word of required transmitting power, thereby accomplish calibration quickly and accurately.Not only improve the calibration accuracy of present two-point method and single-point method, also improved the calibration speed of present point by point method.
Description of drawings
Fig. 1 is the connection sketch map of calibrator (-ter) unit of the present invention;
Fig. 2 is the APC of the present invention flow chart of the implementation method of accurate calibration fast.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
Accurately the calibrating principle of the implementation method of calibration is following fast for APC of the present invention:
(the one tunnel is I to radio frequency I/Q for two components of baseband signal, quadrature each other; One the tunnel is Q) input signal power is Pin, and Pin is a definite value, and analog gain is G; Then output signal power is Pout; Analog gain G receives the control of baseband gain control word, the gain that the Different control word is corresponding different, thus obtain different power.
By following formula is the basis:
Let the every frame of base band send out a control word, promptly every frame is revised gain; Then, utilize instrument storage multiframe measurement result characteristic, once obtain all power outputs one to one; At last, select desired power value and control corresponding word, thereby accomplish the calibration of power.
The present invention needs to store the instrument (hereinafter to be referred as power measuring) of multiframe transmitting power measurement result, surveys appearance SP6010 eventually like Milky Way bright spot TD-SCDMA.As shown in Figure 1, when PC power controlling tester begins test and obtains measurement result from this power measuring; When the PC control terminal begins emission.
As shown in Figure 2, idiographic flow step of the present invention is following:
1, guarantee PC end and power measuring and PC end communicate by letter with mobile phone (terminal) errorless after, rectify true allocating power tester with PC, start then and trigger, prepare to measure the signal power value that mobile phone launches, the PC notice mobile phone end that says the word begins to launch simultaneously.
2, mobile phone end receives after the order that begins to launch that to power measuring transmit signal power value, wherein each subframe changes APC control word, promptly lets the every frame of base band send out a control word, and every frame is revised gain.Be specially: first subframe of digital baseband is sent power with control word word0, and next subframe increases (as add 1bit, promptly be step increments with 1bit) to control word by minimum step and sends power, and each subframe all progressively increases by minimum step and sends power later on.Here each subframe (TD-SCDMA is 5ms) increases progressively the APC control word one time, can change the APC control word flexibly and change the cycle according to the minimum measuring period of power measuring, increases progressively by time slot (TD-SCDMA is 675 μ s) as considering, thereby accelerates calibration speed.
3, PC wait mobile phone is by after all control word battery has fireds, and disposable performance number of from power measuring, taking out correspondence when pressing these control words emissions is picked out the corresponding control word of power demand value, has so just accomplished calibration.
Certainly; Generally speaking; The requirement of (base station control portable terminal through power control command transmitting power be so-called closed power control) scope is more than 75dB because closed power control; Power measuring is difficult to satisfy so big dynamic range, can be divided into two less dynamic ranges and carry out power measurement.The concrete realization as follows:
1, the RF input power grade inputLevel_1 of power measuring rationally is set during small-power
Mobile phone guarantees that with the emission of the control word in the low power range power measuring can go out the power in the low power range by correct measurement.
The RF input power grade inputLevel_2 of power measuring rationally is set when 2, high-power
Mobile phone guarantees that with the emission of the control word in the high-power scope power measuring can go out the power in the high-power scope by correct measurement.
Simultaneously; Can be according to actual conditions, the stepping of adjustment control word, can adopt by bit (bit) or dibit or tribit is that stepping is measured; Extrapolate the corresponding control word of power demand according to actual conditions then; Recording the result when for example stepping is for 2bit is: the corresponding power of word0 is 16.8dbm, and word1 (word0+2) 17.2dbm is the corresponding control word of 17dbm and we need; Power increased 0.2db when this just can count stepping 2bit according to other measurement results, and so just can obtain the corresponding control word of 17dbm is word0+1.
The present invention makes full use of the power measuring with buffer memory multiframe (or multi-slot) characteristic; The disposable transmitting power that gets access to multiframe (or multi-slot) fast; Corresponding with the control of digital baseband part APC; Obtain the control of the corresponding digital baseband part APC of precise transmit power, thus strict control radio band transmitting power.
Claims (5)
1. the implementation method that APC accurately calibrates fast is characterized in that, adopts PC, terminal and power measuring, comprises the steps: the first step, and PC starting power tester begins test, and the notice terminal transmits; In second step, the terminal transmits to power measuring, and wherein each subframe of digital baseband changes the APC control word; Described each subframe changes APC control word and specifically comprises: first subframe of digital baseband is sent power with control word word0, and next subframe is sent power to control word by the minimum step increase, and each subframe all progressively increases by minimum step and sends power later on; In the 3rd step, PC wait terminal is by after all control word battery has fireds, and disposable performance number of from power measuring, taking out correspondence when pressing these control word emissions is picked out the corresponding control word of power demand value, thereby accomplished the calibration of power.
2. the implementation method that APC as claimed in claim 1 accurately calibrates fast is characterized in that, in second step, said each subframe changes APC control word, according to the minimum measuring period of power measuring, changes the APC control word.
3. the implementation method that APC as claimed in claim 1 accurately calibrates fast is characterized in that, in second step, described minimum step is a bit or dibit or tribit stepping.
4. the implementation method that APC as claimed in claim 1 accurately calibrates fast is characterized in that described power measuring carries out power measurement through the closed power control range being divided into two less dynamic ranges.
5. the implementation method that APC as claimed in claim 1 accurately calibrates fast is characterized in that described power measuring can be stored multiframe transmitting power measurement result.
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| CN101304270B true CN101304270B (en) | 2012-05-09 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102088321A (en) * | 2009-12-04 | 2011-06-08 | 展讯通信（上海）有限公司 | Calibration method of time division-synchronization code division multiple access (TD-SCDMA) terminal |
| CN101951634B (en) * | 2010-09-02 | 2012-12-12 | 湖北众友科技实业股份有限公司 | Method and system for automatic power control calibration of TD-LTE terminal |
| CN103036623B (en) * | 2011-09-30 | 2015-05-27 | 重庆重邮信科通信技术有限公司 | Mobile terminal power control test calibrating method and mobile terminal |
| CN103906214A (en) * | 2012-12-28 | 2014-07-02 | 联芯科技有限公司 | LTE terminal uplink signal power calibrating method |
| CN107222269B (en) * | 2017-06-29 | 2021-04-30 | 苏州经贸职业技术学院 | GSM APC (global system for mobile communications) quick and accurate calibration implementation method based on saturated PA (power amplifier) |
| CN112235762A (en) * | 2020-10-14 | 2021-01-15 | 重庆邮电大学 | Rapid calibration method for eMTC terminal power control under signaling |
| WO2023155595A1 (en) * | 2022-02-21 | 2023-08-24 | Oppo广东移动通信有限公司 | Power calibration method for maximum power fluctuation, terminal device, and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1719736A (en) * | 2005-07-19 | 2006-01-11 | 中兴通讯股份有限公司 | Method for correcting power |
| CN1819483A (en) * | 2006-02-28 | 2006-08-16 | 北京天碁科技有限公司 | Down power controlling system and method based on mobile terminal power prediction |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1719736A (en) * | 2005-07-19 | 2006-01-11 | 中兴通讯股份有限公司 | Method for correcting power |
| CN1819483A (en) * | 2006-02-28 | 2006-08-16 | 北京天碁科技有限公司 | Down power controlling system and method based on mobile terminal power prediction |
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