CN101494477B - Terminal power control method and device - Google Patents
Terminal power control method and device Download PDFInfo
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Abstract
The invention discloses a terminal power control method and a device thereof, which aim at solving the problems that in the prior art, the complexity of compensation is high, the occupied memory space is large and the time of production alignment is long. The method comprises the following steps: when receiving power control word from a base station, a signal processor determines the power level of the next transmission according to the attribute of the power control word and the current power detection value; a power control signal corresponding to the power level is obtained according to the corresponding relation between the stored power level and the power control signal and then the power control signal is transmitted to a transmitter; and the transmitter controls the power level of a transmitting signal according to the power control signal. According to the proposal, the requirements of the output power of the terminal are met, simultaneously, a terminal power control circuit of the prior art is simplified, the occupied memory space is reduced and the time of the production alignment is shortened.
Description
Technical Field
The present invention relates to the technical field of third Generation Mobile Communications (3G, 3rd Generation Mobile Communications) TD-SCDMA systems, and in particular, to a method and an apparatus for controlling terminal power.
Background
Power control is one of the core technologies of modern mobile communication systems, and aims to overcome the near-far effect, so that the system can maintain high-quality communication and does not generate undesirable interference to other users occupying the same channel.
The power control is divided into downlink power control and uplink power control, wherein the downlink power control is used for adjusting the power transmitted by a base station to a User Equipment (UE); uplink power control is to control the transmission power of each ue, and can be divided into open-loop power control and closed-loop power control.
The precondition of the uplink open loop power control is that assuming that the uplink and downlink transmission losses are the same, the mobile terminal receives and measures the signal strength sent by the base station, estimates the downlink transmission loss, and then according to the estimation, the terminal self-adjusts its transmitting power, that is, the received signal is enhanced, and then reduces its own power; the received signal decreases and its transmit power increases. Uplink closed loop Power Control, that is, the base station detects the signal strength or signal-to-noise ratio from the terminal, compares the detected result with an expected value to form a Power Control command (TPC), and informs the terminal to adjust its transmission Power.
Generally speaking, a Power control system of a terminal radio frequency circuit is composed of 4 parts, namely, a Power amplifier, a transmitter, a baseband unit and a memory, wherein the baseband unit reads a corresponding APC (auto Power control) control word from the memory according to a Power value output as required, then the APC control word is used to control the transmitter to transmit a signal of Power corresponding to the APC control word, the signal is transmitted after passing through the Power amplifier, and a storage format of the APC control word in the memory is usually an APC table.
Generally, the APC control word has a good linear relationship with the transmitted power, but in practice, the physical characteristics of the device used by the terminal cannot present perfect characteristics, which mainly represents two aspects:
1. the gains of devices or circuits such as a transmitter and a power amplifier have large discreteness, namely: the gain is different for different devices;
2. the gain of a device or circuit varies with environmental conditions, particularly temperature and voltage, and the variation is not ideally linear.
For these two characteristics of the device, the prior art solutions propose corresponding solutions: aiming at the discreteness, the method solves the problem by means of production calibration of each terminal, and the calibration result is usually stored in the form of an APC (automatic Power control) calibration table; the problem that the gain is affected by environmental conditions is solved by adopting a compensation circuit for increasing environmental factors such as temperature, voltage, humidity and the like besides improving the characteristic requirements of the used devices or circuits.
Fig. 1A shows an operation schematic diagram of compensating for temperature and voltage in a prior art scheme, in which a temperature detection circuit and a voltage detection circuit are added in a terminal, so that the terminal can detect ambient temperature and operating voltage in real time, and accuracy of power control of the terminal is improved by compensating for temperature and voltage. The main steps of the power control of the terminal are shown in fig. 1B:
step 101: calibrating APC control words corresponding to all power levels for each terminal during production calibration to form an APC calibration table, and recording the production calibration temperature and the production calibration voltage during calibration in the APC calibration table during calibration of the APC control words; and measuring the compensation coefficient C of temperature and voltage through experiments1、C2And also recorded in the APC calibration table, and the contents recorded in the last APC calibration table are shown in table 1.
Step 102: when the terminal normally works, the environmental temperature T is detected at regular time1And voltage V1。
Step 103: reading the corresponding APC control word APC in the APC calibration table according to the power required to be outputTABLEAnd corresponding production calibration temperature T0And producing a calibration voltage V0。
Step 104: calculating the difference value delta T between the environment temperature and voltage and the production calibration temperature and voltage when the terminal works1-T0And Δ V ═ V1-V0。
Step 105: calculating the value of the APC control word after temperature and voltage compensation according to the following formula;
APC＝APCTABLE+
T×C1+
V×C2
step 106: and controlling the transmitter to transmit a signal of a corresponding power level by using the calculated compensated APC control word.
TABLE 1 APC calibration Table of the prior art
| Temperature compensation coefficient C1 | xxx | ||
| Voltage compensation coefficient C2 | xxx | ||
| Power class (dBm) | APC control word | Production calibration temperature | Producing a calibration voltage |
| 24 | xxx | xxx | xxx |
| 23 | xxx | xxx | xxx |
| 22 | xxx | xxx | xxx |
| 21 | xxx | xxx | xxx |
| ... | ... | ... | ... |
| ... | ... | ... | ... |
| -50 | xxx | xxx | xxx |
The method is an open-loop compensation method, each factor influencing the gain needs to be considered independently, a temperature detection circuit and a voltage detection circuit are added, if the influencing factors are more, the compensation is more complicated, the added detection circuits are more, and the memory space occupied by the APC calibration table is larger; in addition, the time for production calibration is longer due to environmental factors such as temperature and voltage at which each power level calibration needs to be tested, and the longer the production calibration is if more factors are considered.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for controlling terminal power, so as to solve the problems of high compensation complexity, large occupied memory space, and long production calibration time in the prior art.
A terminal comprising a power amplifier, a transmitter, the user terminal comprising:
the memorizer is used for storing the corresponding relation between the power detection value and the output power;
and the signal processor is used for receiving a power adjustment instruction from a base station, detecting the transmission power transmitted by the power amplifier to obtain a power detection value, obtaining the output power corresponding to the power detection value according to the corresponding relation between the power detection value and the output power, determining the power level of the next secondary transmission according to the output power and the power adjustment instruction, and transmitting a power control signal corresponding to the power level to the transmitter.
A method for power control of a terminal, applied to a terminal comprising a power amplifier, a transmitter, a memory and a signal processor, the method comprising, during normal operation of the terminal:
when the signal processor receives a power adjustment instruction from a base station, determining the power level of the next transmission according to the instruction of the power adjustment instruction and the current power detection value;
acquiring a power control signal corresponding to the power grade according to the corresponding relation between the set power grade and the power control signal, and sending the power control signal to a transmitter;
and the transmitter adjusts the power of the transmission signal according to the power control signal.
A method of measuring terminal transmit power, comprising:
and the terminal acquires a current power detection value from the signal processor, and determines the output power corresponding to the power detection value as a current transmitting power value according to the stored corresponding relation between the power detection value and the output power.
In the embodiment of the invention, the transmitting power of the terminal is detected, and then the transmitting power grade of the terminal is adjusted according to the value of the detected power and the received power adjusting command, so that the terminal power control circuit in the prior art is simplified, the occupied memory space is reduced, and the production calibration time is shortened.
Drawings
FIG. 1A is a schematic diagram of a prior art solution;
FIG. 1B is a flow chart of a prior art scheme for power control of a terminal;
fig. 2 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 3 is a flowchart of a terminal power control method according to an embodiment of the present invention;
FIG. 4A is a flowchart illustrating calibration of APC control words corresponding to all power levels according to an embodiment of the present invention;
FIG. 4B is a diagram illustrating linear fitting of a power level to an APC control word according to an embodiment of the present invention;
fig. 5 is a flow chart of measuring transmission power in an embodiment of the present invention.
Detailed Description
In this embodiment, a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system terminal is taken as an example for explanation.
Mobile communication partnership project group according to the third generation (3GPP, 3)rd Generation Partnership Project) specification, the specific requirements of the TD-SCDMA terminal for uplink power control are as follows:
1) maximum output power of UE
Table 2 lists the maximum nominal output power and margin for different power class definitions.
TABLE 2 UE maximum output Power and margin
| Power class | Maximum output | Tolerance margin | |
| 1 | +30dBm | +1dB/-3dB | |
| 2 | +24dBm | +1dB/-3dB | |
| 3 | +21dBm | +2dB/-2dB | |
| 4 | +10dBm | +4dB/-4dB |
2) Open loop power control
Open loop power control is the ability of the UE transmitter to set its output power to a specified value. Table 3 lists the minimum margin requirements for open loop power control.
TABLE 3 minimum margin for open loop power control
| Normal condition | ±9dB |
| Extreme conditions | ±12dB |
3) Closed loop power control
In the next time slot after the UE receives the Power Control Command (TPC _ cmd, Transmit Power Control Command), the transmitter has the capability to change its output Power by 1, 2 or 3dB according to the value of TPC or RP-TPC, with the minimum requirement as follows:
TABLE 4 output Power step Range of transmitter when applying closed Loop Power control
| Transmitting power control commands | Transmission power control range | |
| 1dB step size | 2dB step size | 3dB step size |
| (TPC_cmd) | Minimum value | Maximum value | Minimum value | Maximum value | Minimum value | Maximum value |
| Lift (Up) | +0.5dB | +1.5db | -1dB | +3dB | +1.5dB | +4.5dB |
| Descending (Down) | -0.5dB | -1.5dB | -1dB | -3dB | -1.5dB | -4.5dB |
TABLE 5 mean output power step size range for a transmitter when applying closed loop power control
| Transmission power control command (TPC _ cmdgroup) | Transmitter power control range after 10 identical transmit power control commands | |||||
| 1dB step size | 2dB step size | 3dB step size | ||||
| Minimum value | Maximum value | Minimum value | Maximum value | Minimum value | Maximum value | |
| Lift (Up) | +8dB | +12dB | +16dB | +24dB | +24dB | +36dB |
| Descending (Down) | -8dB | -12dB | -16dB | -24dB | -24dB | -36dB |
A power control command set (TPC _ cmd group) is a combination of a set of power control commands that can be derived from a series of consecutive power control commands within the same time.
4) Transmit power measurement accuracy
TABLE 6 transmit power measurement accuracy
| Parameter | Unit | PUEMAX | |
| 24dBm | 21dBm | ||
| UE transmitted power＝PUEMAX | dB | +1/-3 | ±2 |
| UE transmitted power＝PUEMAX-1 | dB | +1.5/-3.5 | ±2.5 |
| UE transmitted power＝PUEMAX-2 | dB | +2/-4 | ±3 |
| UE transmitted power＝PUEMAX-3 | dB | +2.5/-4.5 | ±3.5 |
| PUEMAX-10≤UE transmittedpower＜PUEMAX-3 | dB | +3/-5 | ±4 |
It can be seen from the above requirements that in TD-SCDMA terminals, the requirement for uplink open loop power control is relatively low, and the characteristics of the device itself can be satisfied, while the requirement for closed loop power control is relatively high, and a certain range of tolerance is allowed for the maximum transmit power and the transmit power measurement accuracy. If the terminal fails to meet these requirements, the radio frequency conformance test may fail and further the protocol conformance test may be affected. In order to enable the terminal to meet the requirements, the embodiment of the invention provides a method and a device for controlling the power of the terminal.
The following description will explain the embodiments of the present invention with reference to the drawings.
Fig. 2 shows a schematic structural diagram of a terminal according to an embodiment of the present invention, which includes a power amplifier, a transmitter, a memory and a signal processor. Wherein,
and the memory is used for storing the corresponding relation between the power level and the power control signal and also storing the corresponding relation between the power detection value and the output power.
The data stored in the memory are obtained in the production calibration of the terminal.
In the specific implementation process, the Power control signal is an APC (auto Power control) control word, during production calibration, the Power amplifier of the terminal sends Power of different levels respectively, obtains a corresponding APC control word when each Power control level is transmitted, and stores each Power level and the corresponding APC control word in the memory.
In order to make the relation between the power level and the APC control word satisfy the linear relation, the stored power level and the APC control word may be linearly fitted, and the fitted data may be stored in the memory.
The correspondence relationship between the power detection value and the output power is also obtained at the time of production calibration, and the correspondence relationship between the power detection value and the output power stored in the memory may be a relationship between each output power and its corresponding power detection value, or may be a characteristic for determining the relationship between the power detection value and the output power, because in general, a linear relationship should be satisfied between the power detection value and the output power. In the former case, the terminal may be enabled to transmit different levels of power respectively during production calibration, and corresponding power detection values may be measured and stored. For the latter case, a reference output power and a reference output power may be selected, the terminal may transmit the two powers, respectively, and the power detection values under the two cases may be measured, so that a coefficient determining a relationship between the power detection value and the output power may be obtained.
And the signal processor is used for receiving a power adjustment instruction from a base station, detecting the transmission power transmitted by the power amplifier to obtain a power detection value, obtaining the output power corresponding to the power detection value according to the corresponding relation between the power detection value and the output power, determining the power level of the next secondary transmission according to the output power and the power adjustment instruction, and transmitting a power control signal corresponding to the power level to the transmitter.
Further, the signal processor includes: a feedback circuit and a baseband unit. Wherein,
the feedback circuit is connected with the power amplifier and is used for detecting the transmitting power transmitted by the power amplifier and feeding back a detected power value to the baseband unit;
and the baseband unit is connected with the feedback circuit and used for receiving the power detection value sent by the feedback circuit, acquiring output power corresponding to the power detection value according to the stored corresponding relation between the power detection value and the output power, determining the power grade of the next transmission according to the output power and the received power adjustment instruction from the base station, and sending a power control signal corresponding to the power grade to the transmitter.
And the feedback circuit further comprises: a sampling circuit and a power detection circuit. Wherein,
the sampling circuit is connected with the power amplifier and is used for sampling the transmitting power transmitted by the power amplifier and transmitting the sampled power to the power detection circuit;
and the power detection circuit is connected with the sampling circuit and used for measuring the power sampled by the sampling circuit and transmitting the measured power detection value to the baseband unit.
As can be seen from table 6, the range of the transmission power to be detected is about 10dB, the power range of the power detection circuit can be designed to be about 20dB, and the range of the power detection value can be matched with the detected transmission power level.
In the implementation process, the sampling circuit and the power detection circuit can be implemented in various ways, for example, a directional coupler can be used as the sampling circuit, and a diode can be used as the power detection circuit.
The specific flow of the method for controlling the terminal power provided by the implementation of the present invention is shown in fig. 3, and mainly includes the following steps:
step 301: and when receiving a power adjustment instruction from the base station, the signal processor determines the power level of the next transmission according to the instruction of the power adjustment instruction and the current power detection value.
Specifically, step 301 may include:
step 301 a: acquiring a current power detection value from a feedback circuit, and acquiring output power corresponding to the power detection value according to a corresponding relation between the stored power detection value and the output power;
the corresponding relation between the power detection value and the output power is obtained during production calibration, and the corresponding relation between the power detection value and the output power can have two storage forms, wherein one storage form is to store the power detection value corresponding to each fixed output power; in general, the power detection value is linearly related to the output power, so a coefficient for determining the relationship between the output power and the power detection value may be stored.
For the first storage form, the method for acquiring the corresponding relation between the power detection value and the output power during production calibration comprises the following steps:
the power amplifiers of the terminal respectively send different output powers, power detection values corresponding to the output powers are measured from the detection circuit, and the obtained output powers and the corresponding power detection values are stored in the memory. With this storage, the output power to be detected is as much as possible in order to obtain the most accurate value possible, which increases the storage space occupied and increases the calibration time.
For the second storage form, the method for acquiring the corresponding relation between the power detection value and the output power during production calibration comprises the following steps:
given a reference output power D0And a reference output power P1The power amplifiers of the terminals respectively transmit the reference output power D0And a reference output power D for measuring a power detection value V corresponding to the transmission reference output power from the detection circuit0Power detection value V corresponding to the time when reference output power D is transmitted1Since the output power is linearly related to the power detection value, the following equation holds:
P1＝D0+C(V1-V0)
according to the equation, the value of C can be calculated, and the corresponding output power P can be obtained for any power detection value Vout：
Pout＝D0+C(V-V0)
Saving the parameter D in the memory0、V0And C. By adopting the storage form, for any power detection value, the corresponding output power can be calculated, the accuracy is high, the occupied storage space is small, and the calibration time is reduced.
Step 301 b: and correspondingly adjusting the power level of the last transmission according to the received power adjustment instruction and the relation between the output power and the preset maximum rated output power, and then taking the power level of the last transmission as the power level of the next transmission.
If the power adjustment command is DOWN, step 301b comprises:
and after the power level of the last transmission is adjusted downwards by one STEP STEP, the power level of the next transmission is taken as the power level of the next transmission. The STEP size STEP is issued to the terminal by the network side through signaling, and may be 3dB, 2dB or 1 dB.
If the power adjustment command is UP, step 301b comprises:
judging the output power PoutWhether the maximum rated output power P of the terminal is larger than or equal tomaxOffset by δ from its downward directionminThe difference is determined (P)out≥Pmax-δmin) If yes, the power level of the last transmission is taken as the power level of the next transmission, otherwise, the step A is carried out;
step A, judgment (P)outWhether + STEP) is greater than (P)max+δmax) Wherein δmaxB, the upward offset of the maximum rated output power is obtained, if so, the step B is continued, otherwise, the step C is carried out;
STEP B, judging whether the STEP is equal to 1dB, if so, taking the power level of the last emission as the power level of the next intersection emission, otherwise, subtracting 1dB from the current STEP size as the current effective power STEP size, namely, the STEP is equal to STEP-1 and returns to the STEP A;
and STEP C, after the power level of the last emission is adjusted up by a current STEP length STEP, the power level of the next emission is taken as the power level of the next emission.
Step 302: and acquiring a power control signal corresponding to the power grade according to the stored corresponding relation between the power grade and the power control signal, and sending the power control signal to the sender.
The corresponding relation between the power grade and the power control signal is determined during production calibration, and in the specific implementation process, the power control signal is an APC control word.
In the production calibration, the method for obtaining the corresponding relationship between the power level and the APC control word is shown in fig. 4A, and includes:
S401A: respectively transmitting power of all levels at a power amplifier, and measuring and storing an APC control word corresponding to each power level;
S402A: and judging the proportional relation between each group of power levels and the APC control word, performing linear fitting on the APC control word deviating from the linear relation, as shown in FIG. 4B, and recording the fitted data into the APC calibration table.
The calibration method solves the problem of non-linear characteristics between the power level and the APC control word, can obtain the corresponding APC control word according to linear fitting for larger input power, and can eliminate the influence of external factors such as temperature, voltage and the like on the corresponding relation between the power level and the APC control word.
Of course, if the requirements are not high, the corresponding relationship between the power level and the APC control word may not be linearly fitted.
In conjunction with the above description, it can be seen that the data stored in the memory at the time of production calibration is shown in table 7.
TABLE 7 APC calibration chart for the examples of the present invention
| Reference output power D0 | xxxx |
| Reference detection power V0 | xxxx |
| Detection of power coefficient C | xxxx |
| Power class (dBm) | APC control word |
| 26 | xxxx |
| 25 | xxxx |
| 24 | xxxx |
| 23 | xxxx |
| 22 | xxxx |
| 21 | xxxx |
| ... | ... |
| xxxx | xxxx |
| ... | ... |
| -50 | xxxx |
After determining the next transmission power level, the baseband unit reads the corresponding APC control word from the memory and sends the APC control word to the transmitter.
Step 303: and the transmitter transmits a signal with corresponding power according to the APC control word.
Fig. 5 shows a flow of a method for measuring a transmission power of a terminal according to an embodiment of the present invention, where the method is applied to a terminal including a power amplifier, a transmitter, a memory, and a signal processor. The method mainly comprises the following steps:
step 501: and when the terminal normally works, acquiring the current power detection value measured by the signal processor.
Step 502: and determining the output power corresponding to the power detection value, namely the transmitting power of the current terminal according to the corresponding relation between the power detection value and the output power stored in the memory.
If the coefficient for determining the relationship between the power detection value and the output power is stored in the memory, the current transmission power value can be calculated based on the current power detection value.
If the power detection value corresponding to the specific output power is stored in the memory, the output power corresponding to the power detection value closest to the current power detection value, namely the transmission power value of the terminal can be obtained.
Although the TD-SCDMA terminal is taken as an example for illustration, it is not limited thereto, and it is obvious to those skilled in the art that other similar systems can be processed in the same way as the TD-SCDMA system terminal according to the above description.
The embodiment of the invention is a terminal power control method based on closed loop, which adopts a sampling circuit insensitive to environmental factors and a power detection circuit to sample and detect the power transmitted by a terminal, and then controls the transmitting power of the terminal according to the detected power value, thereby reducing the complexity of the circuit; during production calibration, when the power level is large enough to enable the power level and the APC control word not to meet the linear relation, a linear fitting method is adopted for fitting, and the nonlinear characteristic of the power amplifier is solved; the embodiment of the invention accurately controls the maximum transmitting power of the terminal, improves the accuracy of the maximum transmitting power and enables the index of the maximum transmitting power to be rich, thereby reducing the precision requirements of production calibration and test and improving the production efficiency; in addition, the power control algorithm provided by the embodiment of the invention is simple, easy to understand and easy to operate in practice.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A terminal comprising a power amplifier, a transmitter, characterized in that the user terminal comprises:
the memorizer is used for storing the corresponding relation between the power detection value and the output power;
the signal processor is used for receiving a power adjustment instruction from a base station, detecting the transmission power transmitted by the power amplifier to obtain a power detection value, obtaining the output power corresponding to the power detection value according to the corresponding relation between the power detection value and the output power, determining the power level of the next secondary transmission according to the output power and the power adjustment instruction, and transmitting a power control signal corresponding to the power level to the transmitter;
the signal processor includes: a feedback circuit and a baseband unit, wherein,
the feedback circuit is used for detecting the transmitting power transmitted by the power amplifier and feeding back a detected power value obtained by detection to the baseband unit;
and the baseband unit is used for receiving the power detection value sent by the feedback circuit, acquiring output power corresponding to the power detection value according to the stored corresponding relation between the power detection value and the output power, determining the power grade of the next transmission according to the output power and the received power adjustment instruction from the base station, and sending a power control signal corresponding to the power grade to the transmitter.
2. The terminal of claim 1, wherein the feedback circuit comprises:
the sampling circuit is connected with the power amplifier and is used for sampling the transmitting power transmitted by the power amplifier and transmitting the sampled power to the power detection circuit;
and the power detection circuit is connected with the sampling circuit and used for detecting the power sampled by the sampling circuit and transmitting the detected power detection value to the baseband unit.
3. The terminal of claim 1, wherein the baseband unit comprises:
an acquisition unit configured to acquire output power corresponding to the received power detection value according to a correspondence between the stored power detection value and the output power;
a determining unit, configured to determine a power level of a next secondary transmission according to the output power and a received power adjustment instruction from the base station;
and the sending unit is used for determining the power control signal corresponding to the power grade according to the stored relation between the power grade and the power control signal and sending the power control signal to the sender.
4. The terminal of claim 1, wherein the correspondence of the power detection value to the output power comprises: and determining the characteristic of the relation between the power detection value and the output power, wherein the characteristic of the relation between the power detection value and the output power is a linear relation.
5. A method for power control of a terminal, the method being applied to a terminal comprising a power amplifier, a transmitter, a memory and a signal processor, wherein the method comprises, during normal operation of the terminal:
when receiving a power adjustment instruction from a base station, the signal processor determines a power level of next transmission according to an indication of the power adjustment instruction and a current power detection value, wherein the determining the power level of next transmission comprises:
acquiring a current power detection value from a feedback circuit, and acquiring output power corresponding to the power detection value according to a corresponding relation between the stored power detection value and the output power;
according to the instruction of the power adjustment instruction and the relation between the output power and the preset maximum rated output power, correspondingly adjusting the power level of the last transmission to be used as the power level of the next transmission;
acquiring a power control signal corresponding to the power grade according to the corresponding relation between the set power grade and the power control signal, and sending the power control signal to a transmitter;
and the transmitter adjusts the power of the transmission signal according to the power control signal.
6. The method of claim 5, wherein if the power adjustment command is down, said correspondingly adjusting the power level of the previous transmission as the power level of the next transmission comprises:
and after the power level of the last transmission is adjusted down by one step length, the power level of the next transmission is taken as the power level of the next transmission.
7. The method of claim 5 wherein said adjusting the power level of the previous transmission to a power level of the next transmission if the power adjustment command is UP comprises:
A. determining whether the output power is larger than or equal to the difference between the maximum rated output power and the downward offset, if so, taking the power level of the last transmission as the power level of the next transmission, otherwise, setting the step length as the current effective step length, and entering the step B;
B. judging whether the sum of the output power and the current effective step length is larger than the sum of the maximum rated output power and the upward offset, if so, entering a step C, otherwise, entering a step D;
C. judging whether the current effective step length is equal to 1dB, if so, taking the power level of the last transmission as the power level of the next transmission, otherwise, subtracting 1dB from the current effective step length as the current effective step length, and returning to the step B to judge again;
D. and the power level of the last transmission is adjusted up by one current effective step length to be used as the power level of the next transmission.
8. The method of claim 5, wherein the stored power detection value to output power correspondence comprises:
before the terminal works normally, when a power amplifier transmits reference output power, the current power detection value is saved, and the reference output power is saved;
when the power amplifier transmits a preset reference output power signal, acquiring a current power detection value;
and calculating a coefficient for determining the linear relation between the power detection value and the output power according to the power detection value and the reference output power as well as the stored reference output power and the power detection value, and storing the coefficient.
9. The method of claim 5, wherein the corresponding relationship between the set power level and the power control signal comprises:
before the terminal works normally, the power amplifiers respectively transmit power of all levels, and corresponding power control signals when each power level is transmitted are stored;
and judging the proportional relation between the power grade of each group and the power control signal, performing line fitting on the power control signal deviating from the linear relation, and updating the corresponding relation between the power grade and the power control signal stored before fitting by using the corresponding relation between the power grade and the power control signal of each group after fitting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100566729A CN101494477B (en) | 2008-01-23 | 2008-01-23 | Terminal power control method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100566729A CN101494477B (en) | 2008-01-23 | 2008-01-23 | Terminal power control method and device |
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| CN101790226B (en) * | 2009-12-29 | 2014-06-11 | 中兴通讯股份有限公司 | Method and device for adjusting power amplifier voltage of wireless communication system |
| CN102404831B (en) * | 2011-10-19 | 2014-08-27 | 惠州Tcl移动通信有限公司 | Inner loop power control method for wideband code division multiple access (WCDMA) mobile terminal |
| CN103309394B (en) * | 2012-03-06 | 2016-03-02 | 马维尔国际有限公司 | For improving the method and apparatus of power compensation precision |
| CN105451317B (en) * | 2014-06-26 | 2019-01-11 | 联想(北京)有限公司 | A kind of Poewr control method and user equipment (UE) |
| CN104968036A (en) * | 2015-04-30 | 2015-10-07 | 芯讯通无线科技（上海）有限公司 | Timing advance information emission method and timing advance information emission system |
| CN106549717A (en) * | 2015-09-23 | 2017-03-29 | 中兴通讯股份有限公司 | A kind of transmission power detection method and device |
| IT201600072521A1 (en) * | 2016-07-12 | 2018-01-12 | Inst Rundfunktechnik Gmbh | MOBILFUNKKOMMUNIKATION MIT VERBESSERTER SENDE- UND EMPFANGSQUALITÄT |
| CN106301602B (en) * | 2016-07-27 | 2019-05-14 | 深圳天珑无线科技有限公司 | The method and device of signal detection |
| WO2021026870A1 (en) * | 2019-08-15 | 2021-02-18 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | User equipment and method of wireless communication of same |
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| CN1780154A (en) * | 2004-11-23 | 2006-05-31 | 乐金电子(中国)研究开发中心有限公司 | Transmitting power control circuit of mobile telephone |
| CN1808914A (en) * | 2006-02-20 | 2006-07-26 | 凯明信息科技股份有限公司 | Automatic power control and calibration gauge for mobile terminal and its design method |
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| CN1780154A (en) * | 2004-11-23 | 2006-05-31 | 乐金电子(中国)研究开发中心有限公司 | Transmitting power control circuit of mobile telephone |
| CN1808914A (en) * | 2006-02-20 | 2006-07-26 | 凯明信息科技股份有限公司 | Automatic power control and calibration gauge for mobile terminal and its design method |
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