JP2001332984A - Transmission output control method, base station device and communications equipment for mobile object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission output control method, capable of speedily making a detected output value which matches with a detection output target value concerning the transmission output control method for keeping a transmission output stable. SOLUTION: This method comprises a detecting processing for detecting a transmitting signal to be transmitted by radio, a comparison processing for comparing an output value detected by detecting the processing with a preset target value, coarse control processing for making the detected output value close to the target value with a fixed control width, when the detected output value is separated from the target value which is larger than a fixed value, on the basis of the compared result and fine control processing for making the detected output value close to the target value with a unit control width smaller than the fixed control width, when the detected output value is within the fixed value from the target value and when the detected output value passes the target value in coarse control processing, processing is performed for making the detected output value close to the target value with half the control width of the fixed control width.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transmission output control method for maintaining a stable transmission output in a mobile communication system, and to a base station apparatus and a mobile communication apparatus.

[0002]

2. Description of the Related Art Conventionally, mobile phones and PHS (Personal Han
dyphone System) and other mobile communication systems
APC (Au) that automatically controls the amplification degree of the power amplification unit provided at the last stage so that the transmission output value output from the transmission output unit of the base station device or the mobile communication device becomes a predetermined value.
to Power Control) circuit.

[0003] This circuit detects a part of the output of a power amplifier, compares the detected output value with a predetermined detected output target value, and adjusts the power so that the detected output value matches the detected output target value. The transmission output is kept stable by controlling the amplification degree of the amplification unit.

FIG. 6 is a block diagram showing a configuration of a conventional base station apparatus having such an APC circuit, and shows a transmission output section of the PHS base station apparatus. The base station apparatus includes a baseband signal processing circuit 1 for outputting a voice signal, a modulator 2 for modulating a voice signal output from the baseband signal processing circuit 1, and a high-frequency signal output from the modulator 2. It has a variable gain amplifier 3 and a power amplifier 4 to amplify, an isolator 5 which is a one-way element, and an antenna switching circuit 6 for selecting any one of four antennas AT1 to AT4 constituting a multi-branch antenna. .

The base station apparatus has a detector 7 for measuring the power value of the high-frequency signal output from the power amplifier 4.
And an A / D converter 8 for A / D (analog / digital) conversion of the output of the detector 7 and an amplification degree of the variable gain amplifier 3 based on a detection output value output from the A / D converter 8. And a control unit 9 for keeping the power value of the high-frequency signal output from the power amplifier 4 at a constant value.

Further, the base station apparatus latches a variable gain control value output from the control unit 9 and latches the variable gain control value, and stores the variable gain control value latched by the latch circuit 10 in a D / A (digital / analog). And a D / A converter 11 for converting and outputting as a variable gain control signal. Variable gain amplifier 3 based on this variable gain control signal
Will be controlled.

The base station apparatus further includes a transmission antenna selection circuit 12 for switching the antenna switching circuit 6 under the control of the control unit 9 to select any one of the antennas AT1 to AT4 constituting a multi-branch antenna. An adjustment data storage unit 13 which is connected to the unit 9 and stores the initial adjustment value of the variable gain control value, the detection output target value, and the like as digital data;
And

Next, a conventional transmission output control method in the base station apparatus will be described with reference to a processing flow chart shown in FIG.

[0009] This process is started by the start of transmission. First, a variable gain control value for controlling the amplification of the variable gain amplifier 3 and a detection output target value are read from the adjustment data storage unit 13 (step S71). The read variable gain control value becomes an initial adjustment value.

Next, the read variable gain control value is latched by the latch circuit 10, converted into an analog signal by the D / A converter 11, and then output to the variable gain amplifier 3 as a variable gain control signal for controlling the amplification ( Step S7
2).

On the other hand, the high frequency signal output from the modulator 2 is amplified by a variable gain amplifier 3 and a power amplifier 4 whose amplification is controlled by a variable gain control signal, and is output to an antenna switching circuit 6 via an isolator 5. Are transmitted as radio waves from the selected antenna.

A part of the output of the power amplifier 4 is detected by the detector 7 and converted into a digital signal by the A / D converter 8, and then obtained as a detection output value by the control unit 9 (step S73). .

The control section 9 compares the obtained detection output value with the detection output target value (step S74), and if the detection output value is larger than the detection output target value, reduces the variable gain control value by a unit step (step S75). If the detection output value is equal to the detection output target value, the variable gain control value is left as it is (step S76). If the detection output value is smaller than the detection output target value, the variable gain control value is increased by unit steps (step S77). ).

The variable gain control value thus obtained is latched again by the latch circuit 10, converted into an analog signal by the D / A converter 11, and then supplied again to the variable gain amplifier 3 as a variable gain control signal for controlling the degree of amplification. (Step S7
2). This series of processing (steps S72 to S77) is repeated until the transmission is completed (step S78), and control is performed so that the transmission output is always kept stable.

[0015]

In the above-described conventional transmission output control method, the amplification of the variable gain amplifier 3 is adjusted by changing the variable gain control value in unit steps. For this reason, it is good when the detection output value is close to the detection output target value, but when the difference between the two values is wide, it takes a long time for the detection output value to reach the detection output target value.

Further, the relationship between the variable gain control value and the detection output value greatly varies depending on the temperature inside the device, as shown in FIG. As is clear from the figure, when a certain variable gain control value is converted into an analog signal by the D / A converter 11 and the amplification degree of the variable gain amplifier 3 is controlled as the variable gain control signal, the variable gain control value is low (for example, 10 degrees Celsius). (Less than), the detection output value exceeds the detection target value, but falls below room temperature (for example, 10 degrees Celsius or more). In particular, since the base station equipment is installed in a location exposed to the open air,
The temperature inside the apparatus fluctuates greatly depending on day or night or season.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and enables a detection output value to be quickly matched with a detection output target value, and furthermore, according to the temperature in the apparatus. The present invention provides a transmission output control method capable of adjusting the detection output target value and the initial adjustment value by using the transmission output control method, and further provides a base station apparatus and a mobile communication apparatus using the transmission output control method. .

[0018]

A transmission output control method according to the present invention comprises a detection process for detecting a transmission signal to be wirelessly transmitted, and a comparison process for comparing a detection output value obtained by the detection process with a preset target value. If the detection output value is separated from the target value by a certain value or more based on the comparison result of the comparison process, a coarse adjustment process that brings the detection output value close to the target value with a certain adjustment width, and the detection output value is deviated from the target value. Fine adjustment processing that brings the detection output value closer to the target value with a unit adjustment width smaller than the certain adjustment width if the detection output value is within the fixed value.If the detection output value passes the target value in the coarse adjustment processing, a constant adjustment is made. This is a process for bringing the detection output value closer to the target value with an adjustment width that is half the width.

According to this method, when the detection output value is separated from the target value by a certain value or more, a coarse adjustment process for bringing the detection output value close to the target value with a certain adjustment width is performed. If the target value has passed the target value and is separated by a certain value or more in the opposite direction, processing is performed to halve the adjustment width and approach the target value.When the detection output value reaches a certain value with respect to the target value, Since the fine adjustment process is performed with a fine unit adjustment width, the detection output value can quickly reach a fixed value, and the detection output value can quickly reach the target value.

Further, the transmission output control method of the present invention includes a temperature detection process for detecting an ambient temperature, and a target value setting for setting a target value and an initial adjustment value in the adjustment process to be lower as the temperature detected by the temperature detection process is lower. And processing.

According to this method, the detection output value tends to exceed the detection target value at a low temperature and tends to fall at a normal temperature, so that the detection output value quickly reaches the target value by correcting the tendency. It can be done.

According to the base station apparatus of the present invention, a detection means for detecting a transmission signal to be transmitted by radio, a detection output value output from the detection means is compared with a preset target value, and the detection output value matches the target value. Control means for adjusting the amplification of the variable gain amplifier so that the detection output value approaches the target value with a certain adjustment width when the detection output value is separated from the target value by a certain value or more, When the detection output value has passed the target value, the detection output value approaches the target value with an adjustment width that is half the fixed adjustment width, and is smaller than the certain adjustment width when the detection output value is within a certain value from the target value. The amplification degree of the variable gain amplifier is controlled so that the detection output value approaches the target value in the unit adjustment width.

With this configuration, when the detection output value is separated from the target value by a predetermined value or more, the control means brings the detection output value close to the target value with a certain adjustment width, and at this time, the detection output value passes the target value. If the detection output value is more than a fixed value in the opposite direction, the adjustment width is halved to approach the target value.If the detection output value reaches a certain value with respect to the target value, the detection output value Is closer to the target value, the detection output value can quickly reach a certain value, and the detection output value can quickly reach the target value.

Further, the base station apparatus of the present invention has a temperature detecting means for detecting the ambient temperature, and a target value setting means for setting the target value and the initial adjustment value in the control means to be lower as the temperature detected by the temperature detecting means is lower. And

With this configuration, the detection output value tends to exceed the target detection value at low temperatures and tends to fall below the normal temperature. Therefore, by correcting this, the detection output value quickly reaches the target value. It can be done.

A mobile communication apparatus according to the present invention comprises a detecting means for detecting a transmission signal to be transmitted by radio, a detection output value output from the detection means and a preset target value, and the detection output value is compared with the target value. Control means for controlling the amplification degree of the variable gain amplifier so that they coincide with each other, and the control means brings the detection output value close to the target value with a certain adjustment width when the detection output value is separated from the target value by a certain value or more. When the detection output value has passed the target value, the detection output value approaches the target value with an adjustment width that is half of the fixed adjustment width, and when the detection output value is within a certain value from the target value, The amplification degree of the variable gain amplifier is controlled so that the detection output value approaches the target value with a small unit adjustment width.

According to this configuration, when the detection output value is separated from the target value by a certain value or more, the control means brings the detection output value close to the target value with a certain adjustment width, and at this time, the detection output value passes the target value. If the detection output value is more than a fixed value in the opposite direction, the adjustment width is halved to approach the target value.If the detection output value reaches a certain value with respect to the target value, the detection output value Is closer to the target value, the detection output value can quickly reach a certain value, and the detection output value can quickly reach the target value.

Further, the mobile communication device of the present invention has a temperature detecting means for detecting an ambient temperature, and a target value setting for setting a target value and an initial adjustment value in the control means lower as the temperature detected by the temperature detecting means is lower. Means.

With this configuration, the detection output value tends to exceed the target detection value at low temperatures, but tends to fall below the normal temperature. Therefore, by correcting this, the detection output value becomes the target value. It can be reached quickly.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a base station apparatus according to the present invention, which shows a transmission output section of a PHS base station apparatus. The description will be made with reference to FIG.

The base station apparatus includes a baseband signal processing circuit 1 for outputting a voice signal and the like, a modulator 2 for modulating a voice signal and the like output from the baseband signal processing circuit 1, and a high frequency output from the modulator 2. A variable gain amplifier 3 and a power amplifier 4 for amplifying a signal, an isolator 5 which is a one-way element, and an antenna switching circuit 6 for selecting any one of four antennas AT1, AT2, AT3 and AT4 constituting a multi-branch antenna. Have.

The base station apparatus further includes a detector 7 for measuring the power value of the high-frequency signal output from the power amplifier 4,
An A / D converter 8 for A / D converting the output of the detector 7, a control unit 9 for obtaining a detection output value output from the A / D converter 8, and a variable gain control value output from the control unit 9 are latched. And a D / A converter 11 for D / A converting a variable gain control value latched by the latch circuit 10 and outputting the variable gain control signal as a variable gain control signal. To control the degree of amplification.

The base station apparatus switches the antenna switching circuit 6 under the control of the control unit 9 to select one of the four antennas AT1 to AT4 constituting the multi-branch antenna. And an adjustment data storage unit 13 connected to the control unit 9 for storing an initial adjustment value of the variable gain control value, a target detection output value, and the like as digital data. The initial adjustment value and the detection output target value have a plurality of values corresponding to the temperature information.

The base station device is disposed near the power amplifier 4 and measures the temperature inside the device. For example, a temperature sensor 14 composed of a thermistor, an output value of the temperature sensor 14 is A / D converted, and the control unit 9 A / D converter 1 to output to
Five.

Next, the operation of the base station apparatus having such a configuration, that is, the transmission power control method will be described with reference to the processing flowchart shown in FIG.

First, the control unit 9 acquires temperature information in the apparatus (step S11). This temperature information is stored in the temperature sensor 1
4 is converted into a digital signal by the A / D converter 15.

Next, the control unit 9 controls the adjustment data storage unit 13
Then, the variable gain control value and the detection output target value corresponding to the temperature information are read from (step S12). The read variable gain control value becomes an initial adjustment value. As shown in FIG. 8, the variable gain control value and the detection output target value are smaller as the temperature is lower.

Next, the control unit 9 sets the adjustment type to fine adjustment (step S13), and reads an adjustment mode switching threshold (hereinafter referred to as threshold) from the adjustment data storage unit 13. As will be described later, when the difference between the detection output value and the detection output target value is smaller than the threshold value, fine adjustment processing is performed, and when the difference is equal to or larger than the threshold value, coarse adjustment processing is performed.

Next, the variable gain control value read in step S12 is latched in the latch circuit 10, and the D / A
The signal is converted into an analog signal by the converter 11 and output to the variable gain amplifier 3 as a variable gain control signal for controlling the degree of amplification (step S15).

The high-frequency signal output from the modulator 2 in this state is amplified by the variable gain amplifier 3 and the power amplifier 4 whose amplification is controlled by the variable gain control signal, respectively.
The signal is output to the antenna switching circuit 6 via the isolator 5. Then, a part of the output of the power amplifier 4 is detected by the detector 7 and converted into a digital signal by the A / D converter 8, and then obtained as a detection output value by the control unit 9 (step S16).

Next, the control unit 9 compares the obtained detection output value with the detection output target value (step S17), and when the detection output value is larger than the detection output target value, performs a minus adjustment process of the variable gain control value (step S17). S18) is executed, and if the detection output value is equal to the detection output target value, the variable gain control value is left as it is (step S19). If the detection output value is smaller than the detection output target value, the variable gain control value is positively adjusted. (Step S20) is executed.

The variable gain control value thus obtained is latched again by the latch circuit 12, converted into an analog signal by the D / A converter 13, and then supplied again to the variable gain amplifier 3 as a variable gain control signal for controlling the degree of amplification. (Step S1
5). This series of processing (steps S15 to S20) is repeated until the transmission is completed (step S21), and control is performed so that the transmission output is always kept stable.

Next, with reference to the processing flow chart shown in FIG. 3, the negative adjustment processing of the variable gain control value (step S
The details of 18) will be described.

First, from the comparison between the detection output value and the detection output target value performed in step S17, the difference between the detection output value and the detection output target value, specifically, both values are shown. It is determined whether the difference is less than or equal to the threshold value (step S31). If the difference between the two values is less than the threshold value, the difference is small, and a minus fine adjustment process is performed. That is,
The variable gain control value is reduced by a unit step (step S3
2) Set the adjustment type to fine adjustment (step S3)
3) Return.

If the difference between the two values is equal to or greater than the threshold value, it is determined what the previous adjustment type was (step S3).
4) If the previous adjustment type is the minus coarse adjustment, a new value obtained by subtracting the adjustment range of the coarse adjustment from the current variable gain control value is used as the variable gain control value in order to continue the minus coarse adjustment as it is (step). (S35), the adjustment type is set to minus coarse adjustment (step S36), and the process returns.
The adjustment width of the coarse adjustment is a fixed value larger than the unit step width.

If the last adjustment type is the fine adjustment, the difference between the two values has increased from less than the threshold to more than the threshold, so that the adjustment width is set to the adjustment width of the coarse adjustment (step S37). Move to step S35.

If the previous adjustment type is the positive coarse adjustment, the detection output value exceeds the detection target value and exceeds the detection target value. Therefore, the adjustment direction is changed from the plus direction to the minus direction. Is not a unit step (step S38), the adjustment width is set to one half of the current value (step S39), and the routine goes to a step S35. If the adjustment width is a unit step, the process immediately proceeds to step S35 because the adjustment width is already the minimum adjustment width.

Next, with reference to the processing flow chart shown in FIG. 4, the plus adjustment processing of the variable gain control value (step S2)
0) will be described in detail.

First, from the comparison between the detection output value and the detection output target value performed in step S17, the difference between the detection output value and the detection output target value, specifically, both values are shown. It is determined whether the difference is less than or equal to the above-described threshold (step S51). If the difference between the two values is less than the threshold value, the difference is small, and a plus fine adjustment process is performed. That is, the variable gain control value is increased by a unit step (step S5).
2) Set the adjustment type to fine adjustment (step S5)
3) Return.

If the difference between the two values is equal to or greater than the threshold value, it is determined what the previous adjustment type was (step S5).
4) If the previous adjustment type is the plus coarse adjustment, a new value obtained by adding the adjustment range of the coarse adjustment to the current variable gain control value is used as the variable gain control value in order to continue the plus coarse adjustment as it is (step). (S55), the adjustment type is set to plus coarse adjustment (step S56), and the routine returns.

If the last adjustment type is fine adjustment, the difference between the two values has increased from less than the threshold to more than the threshold, so that the adjustment width is set to the adjustment width of the coarse adjustment (step S57). The process moves to step S55.

If the previous adjustment type is minus coarse adjustment, the detection output value has fallen below the target detection value, and the adjustment direction is changed from the minus direction to the plus direction. Is not a unit step (step S58), the adjustment width is set to one half of the current value (step S59), and the routine goes to a step S55. If the adjustment width is a unit step, the process immediately proceeds to step S55 since it is already the minimum adjustment width. Thus, the transmission output control process ends.

Next, FIG. 5 is a block diagram showing an embodiment of the mobile communication apparatus according to the present invention, which shows a transmission output section of the PHS terminal apparatus. The description is given with the same reference numerals.

In the case of a mobile communication device, the antenna switching circuit 6 and the transmission antenna selection circuit 1 in the base station device
2 is unnecessary, and the antenna AT becomes single. Since other configurations and operations are the same as those of the above-described base station device,
Detailed description is omitted.

As described above, according to the embodiment of the present invention, when the detected output value is larger than the detected output target value, the minus adjustment process is performed, and when the detected output value is smaller, the plus adjustment process is performed. A process for approaching the target value is performed. When the detection output value is apart from the detection output target value by a threshold or more, the detection output value quickly approaches the threshold value by performing adjustment processing with the adjustment width of the coarse adjustment, and the detection output value reaches the threshold value. Fine adjustment processing is performed with a fine unit adjustment width to match the detection output value with the detection output target value.

If the detection output value passes through the detection output target value and deviates by a threshold value or more in the reverse direction in the coarse adjustment processing, the adjustment width is halved so as to approach the detection output target value. The value will quickly reach the threshold.

Further, by changing the target detection output value and the initial adjustment value according to the temperature in the apparatus, it is corrected that the detection output value tends to exceed the target detection output value at a low temperature, Is corrected, the detection output value quickly reaches the detection output target value.

[0059]

As described above, according to the present invention, the adjustment method is switched in accordance with the difference between the detection output value and the detection output target value, and the detection output value deviates from the target value by a fixed value (adjustment mode switching threshold) or more. If the detection output value has passed the target value and is more than a certain value in the opposite direction after passing the target value, the adjustment width is halved. As the detection output value reaches a certain value, the detection output value can quickly reach a certain value, and when the detection output value reaches a certain value, a fine adjustment process is performed with a finer unit adjustment width. Therefore, it is possible to provide a transmission output control method that allows the detection output value to quickly reach the target value.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a base station apparatus according to the present invention.

FIG. 2 is a processing flowchart showing an embodiment of a transmission output control method according to the present invention.

FIG. 3 is a process flowchart showing details of a minus adjustment process shown in FIG. 2;

FIG. 4 is a process flowchart showing details of a plus adjustment process shown in FIG. 2;

FIG. 5 is a block diagram showing an embodiment of a mobile communication device according to the present invention.

FIG. 6 is a block diagram showing a conventional base station apparatus.

FIG. 7 is a processing flowchart showing a conventional transmission output control method.

FIG. 8 is a temperature characteristic diagram showing a relationship between a variable gain control signal and a detection output value.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Baseband signal processing circuit 2 Modulator 3 Variable gain amplifier 4 Power amplifier 5 Isolator 6 Antenna switching circuit 7 Detector 8 A / D converter 9 Control unit 10 Latch circuit 11 D / A converter 12 Transmission antenna selection circuit 13 Adjustment data storage AT, AT1, AT2, AT3, AT4 Antenna

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinji Arii 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture F-term in Matsushita Communication Industrial Co., Ltd. 5J100 AA20 BA01 BB01 BC05 CA01 CA28 CA29 DA06 FA01 JA01 KA01 LA09 LA10 LA11 QA01 SA01 5K060 BB07 CC04 CC11 DD04 HH05 HH06 KK01 LL01 5K067 AA23 BB04 DD44 EE02 EE10 GG08 GG09

Claims (6)

[Claims] A detection process for detecting a transmission signal to be wirelessly transmitted; a comparison process for comparing a detection output value obtained by the detection process with a preset target value; If the detection output value is separated from the target value by a certain value or more, a coarse adjustment process that brings the detection output value close to the target value with a certain adjustment width, and the detection output value falls within the certain value from the target value. In some cases, the detection output value is finely adjusted to approach the target value with a unit adjustment width smaller than the fixed adjustment width, and when the detection output value passes the target value in the coarse adjustment process, A transmission output control method characterized by performing a process of bringing the detection output value closer to the target value with an adjustment width that is half of a fixed adjustment width. 2. A temperature detection process for detecting an ambient temperature, and a target value setting process for setting an initial adjustment value in the adjustment process to be lower as the temperature detected by the temperature detection process is lower. The transmission output control method according to claim 1, wherein: 3. A detection means for detecting a transmission signal to be transmitted by radio, and a detection output value output from the detection means is compared with a preset target value so that the detection output value matches the target value. Control means for adjusting the amplification degree of the variable gain amplifier, wherein the control means sets the detection output value to the target value with a certain adjustment width when the detection output value is separated from the target value by a certain value or more. Approaching, when the detection output value passes the target value, the detection output value approaches the target value with an adjustment width of half of the constant adjustment width, and the detection output value is within the predetermined value from the target value. Wherein the amplification degree of the variable gain amplifier is controlled so that the detection output value approaches the target value with a unit adjustment width smaller than the fixed adjustment width. 4. A temperature detecting means for detecting an ambient temperature, and a target value setting means for setting the target value and the initial adjustment value in the control means to be lower as the temperature detected by the temperature detecting means is lower. The base station apparatus according to claim 3, wherein: 5. A detection means for detecting a transmission signal to be transmitted by radio, and a detection output value output from the detection means is compared with a preset target value so that the detection output value matches the target value. Control means for controlling the degree of amplification of the variable gain amplifier, wherein the control means sets the detection output value to the target value with a certain adjustment width when the detection output value is separated from the target value by a certain value or more. Approaching, when the detection output value passes the target value, the detection output value approaches the target value with an adjustment width of half of the constant adjustment width, and the detection output value is within the predetermined value from the target value. Wherein the amplification degree of the variable gain amplifier is controlled so that the detection output value approaches the target value with a unit adjustment width smaller than the fixed adjustment width. 6. A temperature detecting means for detecting an ambient temperature, and a target value setting means for setting the target value and the initial adjustment value in the control means to be lower as the temperature detected by the temperature detecting means is lower. The mobile communication device according to claim 5, wherein: