JP2002051007A - Radio communication unit and transmission power control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication unit that properly controls transmission power even in the case of communication where a plurality of kinds of data are multiplexed on the same channel. SOLUTION: A reception section 102 wirelessly receives a signal including at least two service data whose data quality on requirement differs. Data quality measurement sections 104-1-104-3 measure the quality of each of data, and an object reception quality control section 105 controls the object reception quality so that the service data requiring the highest data quality among the data included in the received signal satisfy the requirement of the data quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transmission power control, and more particularly to transmission power control in a mobile communication system using a CDMA (Code Division Multiple Access) system.

[0002]

2. Description of the Related Art In a mobile communication system using a CDMA system, a user signal interferes with another user.
Transmission power control for controlling transmission power of communication between users to a necessary minimum is used. Among these transmission power controls, closed-loop transmission power control is based on a target reception quality (for example, a signal-to-interference ratio (SIR:
Signal to Interference Ratio) is set in advance as the target reception quality, and the magnitude of the target reception quality is compared with the actually measured reception quality. If the measured reception quality is smaller than the target reception quality, And transmitting a transmission power control signal instructing the communication partner to increase the transmission power, and conversely, if the measured reception quality is higher than the target reception quality, the transmission power control signal to the communication partner is increased. Is transmitted, and the transmitting side increases or decreases the transmission power according to the transmission power control signal.

On the other hand, in an actual propagation environment of a mobile communication system, the fading cycle and the state of a delay profile change, so that the reception quality used for transmission power control and the data error rate of a demodulated received signal (eg, , Bit error rate, frame error rate, etc.). Therefore, with only the closed-loop transmission power control described above, if the propagation environment fluctuates, the data quality may be higher or lower than the desired data quality. Becomes

As a correction technique, there is outer loop transmission power control, which is used in combination with closed loop transmission power control. The outer loop transmission power control is control for changing the target reception quality according to the measured data quality. As the outer loop transmission power control, for example, the IEICE General Conference B-5 1999
A control method described in -145 "Outer loop algorithm of transmission power control in CDMA cellular system" is known.

FIG. 13 shows a configuration of a conventional radio communication apparatus for performing outer loop transmission power control. In FIG.
A signal from a communication partner is received from the antenna 11 and demodulated by the receiving unit 12 to obtain demodulated data. Next, the reception quality measuring unit 13 measures the reception SIR to check the reception quality of the demodulated data. Further, the data quality of the demodulated data is measured by the data quality measuring section 14, and the target reception quality setting section 15 performs the target reception so that the desired data quality is obtained based on the data quality measured by the data quality measuring section 14. Quality is controlled.

As the data quality, an error probability of a data block (hereinafter referred to as BLER: Block Error Ratio) can be used. Several methods are known for controlling target reception quality so that a required BLER (hereinafter, referred to as “target BLER”) is obtained. For example, the BLER is calculated by dividing the number of errors in a data block having a sufficient length by the block length in which the error has been detected, and if the calculated BLER is smaller than the target BLER, the target reception quality value is increased by Δ. If it is large, it can be set by performing control to decrease by Δ.

As a control method for quickly obtaining an appropriate target reception quality, the target reception quality is increased by Δup when an error occurs in a block, and reduced by Δdown when no error occurs in the block. There is a way to make it happen. Note that Δup and Δdown satisfy the following relational expression. Δup · target BLER = Δdown · (1−target BLER) According to this control method, it is possible to perform control so that one error per 1 / target BLER occurs on average.
ER can be achieved.

[0008] The transmission power control command generation unit 16 compares the target reception quality determined by the target reception quality setting unit 15 with the reception quality measured by the reception quality measurement unit 13, and the measured reception quality is smaller than the target reception quality. In this case, a transmission power control command for increasing the transmission power and decreasing the transmission power when the transmission power is larger than the target is generated and output to the transmission unit 17. The transmitting unit 17 modulates the transmission power control command together with the transmission data and transmits the modulated command via the antenna 11.

[0009]

When the conventional outer loop transmission power control and closed loop transmission power control are used in combination, audio data, image data,
When communication is performed by multiplexing a plurality of types of data such as facsimile data on the same channel, the target BLER differs depending on the type of data, and the target reception quality also differs depending on the type of data. Therefore, in order to properly perform transmission power control when multiplexing a plurality of types of data and communicating on the same channel, it is necessary to generate a transmission power control command for each type of data.

However, conventionally, generally, a transmission power control command is assigned only one bit per channel in consideration of transmission efficiency, so that a plurality of types of data are multiplexed and communicated on the same channel. in case of,
There is a problem that appropriate transmission power control cannot be performed.

[0011] The present invention has been made in view of the above point, and is capable of performing appropriate transmission power control even when performing communication by multiplexing a plurality of types of data on the same channel. It is an object to provide a communication device.

[0012]

According to the present invention, there is provided a wireless communication apparatus for wirelessly receiving a signal including data of at least two services having different required data qualities, and measuring a data quality for each data. Data quality measuring means, and target reception quality control means for controlling the target reception quality so that the data of the service requiring the highest data quality among the data included in the received signal satisfies the required data quality, Transmission power control means for performing closed-loop transmission power control using the target reception quality.

[0013] The wireless communication apparatus according to the present invention, in the above wireless communication apparatus, comprises an error detecting means for detecting an error in the data, and the target reception quality control means comprises the highest data quality among the data contained in the received signal. Is selected, the target reception quality is increased by a predetermined amount when an error of the selected data is detected by the error detection means, and when no error is detected, the target reception quality is increased. Use a configuration that reduces only the fixed amount.

[0014] The wireless communication apparatus of the present invention is the above wireless communication apparatus, further comprising an error detecting means for detecting an error in the data, wherein the target reception quality control means includes a data receiving means for two or more services simultaneously in the error detecting means. Is detected, the data of the service having the smallest transmission power reduction rate per unit time is selected from among the data included in the received signal, and the error of the selected data is detected by the error detecting means. In this case, the target reception quality is increased by a predetermined amount, and if no error is detected, the target reception quality is reduced by a predetermined amount.

[0015] In the wireless communication apparatus according to the present invention, in the above wireless communication apparatus, the target reception quality control means is included in a received signal when data errors of two or more services are not detected simultaneously by the error detection means. If the data of the service that requires the highest data quality is selected from the data, and the error detection means detects errors in the data of two or more services at the same time, among the data included in the received signal, The data with the smallest transmission power reduction rate per unit time is selected, and the error detection means increases the target reception quality by a predetermined amount when an error of the selected data is detected, and when no error is detected, Employs a configuration for reducing the target reception quality by a predetermined amount.

According to these configurations, even when communication is performed using signals including data of at least two services having different required data qualities, appropriate transmission power control is performed with simple control. Can be.

In the wireless communication apparatus according to the present invention, in the above wireless communication apparatus, the correspondence between the target reception quality and the parameter indicating the communication environment is stored in advance, and the target reception quality is selected from the stored target reception quality. And a target reception quality initial value setting means for selecting a target reception quality corresponding to the communication environment at the time of the control and setting the selected target reception quality as a control initial value.

According to this configuration, the control initial value corresponding to the communication environment at the time of control is determined by referring to the correspondence relationship between the target reception quality and the communication environment which has been checked and stored in advance. However, appropriate transmission power control can be performed quickly.

In the wireless communication apparatus according to the present invention, in the above wireless communication apparatus, a threshold value of a change amount of a parameter indicating a communication environment per unit time is determined, and a target reception quality update amount per one time is determined according to the threshold determination result. And a target quality update amount setting means for obtaining the optimum value of

According to this configuration, the amount of change in the communication environment is determined as a threshold value and the optimum value of the target reception quality per update is obtained. Irrespective of the transmission speed, appropriate transmission power control can be performed promptly, and a desired communication data quality can be obtained stably.

In the wireless communication apparatus according to the present invention, in the wireless communication apparatus, a threshold is set according to a parameter indicating a communication environment, and a target reception quality set by target reception quality control means is determined by the threshold using the threshold. In accordance with the threshold determination result, a configuration is provided that includes target quality threshold processing means that sets the target reception quality set by the target reception quality control means or the threshold as the target reception quality.

In the wireless communication apparatus according to the present invention, in the above wireless communication apparatus, parameters indicating a communication environment include a moving speed,
The configuration is one or more selected from the group consisting of fading frequency, interleave length, rate matching ratio, and error control method.

According to these configurations, even when the communication partner cannot raise the transmission power for some reason or when a block error cannot be detected without transmitting a data block, erroneous control of target reception quality is prevented. Can be. In addition, it becomes possible to control the transmission power of the communication partner, and when the data block is transmitted again, it is possible to quickly transmit with appropriate transmission power, and to quickly obtain a desired communication data quality. .

The radio communication apparatus according to the present invention is the above radio communication apparatus, further comprising monitoring means for monitoring the difference between the reception quality of the received signal and the target reception quality set by the target reception quality control means, The control means does not update the target reception quality when the difference monitored by the monitoring means is equal to or more than a unique value.

According to this configuration, the target reception quality value can be stabilized within a proper range, and proper transmission power control can be performed.

A wireless communication terminal device according to the present invention employs a configuration including the above wireless communication device.

According to this configuration, even when communication is performed using signals including data of at least two services having different required data qualities, appropriate transmission power control can be performed with simple control. It is possible to provide a wireless communication terminal device that can be used.

A radio base station apparatus according to the present invention employs a configuration including the above radio communication apparatus.

According to this configuration, even when communication is performed using a signal including data of at least two services having different required data qualities, appropriate transmission power control can be performed with simple control. It is possible to provide a wireless base station device capable of performing the above.

According to the transmission power control method of the present invention, a signal including data of at least two services having different required data qualities is received by radio, the data quality is measured for each data, and the data included in the received signal is measured. The target reception quality is controlled so that the data of the service that requires the highest data quality among them satisfies the required data quality, and the closed-loop transmission power control is performed using the target reception quality.

According to this method, even when communication is performed using signals including data of at least two services having different required data qualities, appropriate transmission power control can be performed with simple control. A possible transmission power control method can be provided.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The gist of the present invention is that, when communication is performed using at least two services having different required data qualities, data of a service requiring the highest data quality is required. The outer loop transmission power control for controlling the target reception quality so as to satisfy the quality is performed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. (Embodiment 1) FIG. 1 shows a conceptual diagram of a communication system according to the present embodiment. FIG. 1 shows an example in which voice data, facsimile data, and image data are multiplexed on a user channel for communication.

On the transmitting side, voice data, facsimile data and image data are modulated, multiplexed and transmitted on a user channel. On the receiving side, by taking out each data block from the user channel and demodulating each data block, voice data, facsimile data and image data are generated to receive the service.

FIG. 2 is a block diagram showing a configuration of the wireless communication apparatus according to Embodiment 1 of the present invention. As shown in this figure, the wireless communication apparatus according to the present embodiment receives a signal from a communication partner from antenna 101 and demodulates it in receiving section 102 to generate demodulated data. Receiving quality measuring section 103
Measures a signal-to-interference ratio (hereinafter, referred to as “reception SIR”) of a reception signal based on demodulated data to check reception quality. The data quality measuring units 104-1 to 104-3 are:
The data block error probability (hereinafter, BLER: Bl) of the demodulated data demodulated by the receiving unit 102 to check the data quality
ock Error Ratio). The data quality measuring units 104-1 to 104-3 are provided only for the types of multiplexed data. Here, three systems are provided because audio data, facsimile data, and image data are multiplexed. For example, the data quality measuring unit 104-1
Measures the data quality of audio data, the data quality measuring unit 104-2 measures the data quality of facsimile data, and the data quality measuring unit 104-3 measures the data quality of image data. The target reception quality control unit 105 controls the target reception quality so as to satisfy the desired data quality.

The transmission power control command generation unit 106 compares the target reception quality set by the target reception quality control unit 105 with the reception SIR measured by the reception quality measurement unit 103,
If the measured reception SIR is smaller than the target reception quality, a transmission power control command is generated to increase the transmission power, and if larger than the target, decrease the transmission power. Transmitting section 107 modulates the transmission power control command together with the transmission data, and transmits the modulated command from antenna 101.

Next, the operation of the wireless communication apparatus having the above configuration will be described. The signal sent from the communication partner is
The signal is received from the antenna 101 and demodulated by the receiving unit 102 to become demodulated data. The reception quality measuring section 103 measures the reception SIR based on the demodulated data. In the data quality measuring units 104-1 to 104-3, the receiving unit 102
The BLER of the demodulated data demodulated in is measured. The target reception quality control section 105 controls the target reception quality so as to satisfy the desired data quality. The target reception quality control section 105 will be described later in detail. In the transmission power control command generation unit 106, the target reception quality control unit 1
Target reception quality and reception quality measurement section 103 set in step 05
Is compared with the measured reception SIR, and when the measured reception SIR is smaller than the target reception quality, a transmission power control command is generated to increase the transmission power, and when the measured reception SIR is larger than the target, decrease the transmission power. You. In transmitting section 107, the transmission power control command is modulated together with the transmission data, and transmitted from antenna 101.

Next, the control for setting the target reception quality in the target reception quality control section 105 will be described with reference to FIG. FIG. 3 is a diagram illustrating control of target reception quality in target reception quality control section 105.

Data block 1 and data block 2
Are service data requiring different data qualities, for example, data block 1 is audio data, and data block 2 is image data.

The target reception quality control unit 105 pays attention to the data block 1 or the data block 2 and increases the target reception quality by a predetermined increase amount when an error occurs in either of the data blocks. If not, it is reduced by a predetermined amount. The target BLER in the case where control is performed focusing on the data block 1 is set to the target BLER #.
1. The target quality increase is Δup1 and the target quality decrease is Δdown
In the case where control is performed by focusing on the data block 2, the target BLER is the target BLER # 2, and the target quality increase is Δ
Assuming that the up2 and the target quality reduction amount are Δdown2, these amounts satisfy the following relational expressions. Δup1 · target BLER # 1 = Δdown1 · (1−target BL
ER # 1) Δup2 · Target BLER # 2 = Δdown2 · (1-Target BL
ER # 2) According to this control method, control can be performed such that an error occurs once per 1 / target BLER # on average when focusing on data block 1, and focusing on data block 2 In average, 1 / Target BLER # 1 every 2 times
It can be controlled so that the error of the time occurs. Before starting the control of the target reception quality, Δup1, Δdown1, target BLER # 1, Δup2, Δdo satisfying the above relational expression.
wn2, a target BLER # 2 are determined in advance. Goal BLER
Since # 1 and target BLER # 2 are determined by the type of data block, by setting appropriate values as Δup1 and Δup2, Δdown1 and Δdown
2 can be determined. As Δup1 and Δup2,
A value of about 1.0 dB or 0.5 dB is preferable.

In this example, it is assumed that an error occurs in the data block 1 and the data block 2 in the control initial value, and an error occurs only in the data block 2 in a7 and b11. In addition, other a1 to a6, b1 to b1
At 0 and c1, it is assumed that no error occurs in both data block 1 and data block 2.

Here, first, the target reception quality is controlled by focusing on the data block 1 (selecting the data block 1 as a control target). Control of data block 1 is as follows:
This is the control shown in the section A shown in FIG. At the start of the control, the target reception quality is set to the control initial value. Since an error occurs in the data block 1 and the data block 2 in the control initial value, the target reception quality is increased by Δup1 to a1. In a1, no error occurs in either data block 1 or data block 2, so the target reception quality is reduced by Δdown1 to a2. Since no error occurs in both data block 1 and data block 2 in a2, the target reception quality is reduced by Δdown1 to a3. Thereafter, the same control for reducing the target reception quality is performed until an error occurs in the data block 2 in a7.

Since an error occurs only in the data block 2 in a7, the target reception quality is controlled focusing on the data block 2 after a7. As described above, since an error occurs only in the data block 2 in a7, the target reception quality is increased by Δup2 to be b1. In b1, since no error occurs in either data block 1 or data block 2, the target reception quality is reduced by Δdown2 to b2. Since no error occurs in both data block 1 and data block 2 in b2, the target reception quality is reduced by Δdown1 to b3. Hereafter, b
11 until an error occurs in data block 2
Similar control is performed to reduce the target reception quality. In b11, since an error has occurred in the data block 2, the target reception quality is increased by Δup2 to be c1.

In the subsequent section C, the target reception quality is controlled by focusing on the data block 2 (selecting the data block 2 as a control target). Thereby, data block 1
Is correct until the minimum target reception quality changes, and the data block 2 can be controlled so that an error occurs once per 1 / target BLER on average, so that the required data quality can be satisfied. In addition, as a definition of the term, the minimum target reception quality is the smallest target reception quality in which no error occurs in the received data in the transmission power control. That is, when the target reception quality is higher than the minimum target reception quality, no error occurs in the data block.

Although the above-described method of controlling the target reception quality has been described for a case where there are two data blocks,
The present invention is not limited to this, and is applicable when controlling the target reception quality of a number of data blocks according to the type of service.

As described above, when the data block 1 and the data block 2 have different minimum target reception qualities, control is performed to lower the target reception qualities to focus on the data block in which an error first occurs. Even if communication is performed by multiplexing data blocks having different target data qualities on the same channel, control is performed such that all data blocks satisfy the required data quality. be able to.

Next, target reception when data block 1 and data block 2 have the same minimum target reception quality (when errors occur simultaneously when the target reception quality is reduced by performing the above-described control). Quality control will be described with reference to FIG. Also in this case, similarly to the above, the desired BLER and the increase / decrease range of the target reception quality are set to BLER1 ′, Δup1 ′, Δdown1 ′,
For data block 2 ', BLER2', Δup
2 ′ and Δdown2 ′ are determined in advance. At this time, the block length and desired BLER of the data block 1 'and the data block 2' generally differ. In FIG. 4, C and D
Indicates the control state when the above-described target reception quality control is performed on the data block 1 ′ and the data block 2 ′, respectively, but the periods until reaching the minimum target reception quality at which an error occurs are different. In this case, if the control shown in FIG. 4C is performed while focusing on the data block 1 'having a short cycle, the data block 2' does not satisfy the desired BLER. Conversely, if the control shown in FIG. 4D is performed while focusing on the data block 2 'having a long cycle, the respective target BLERs of the data block 1' and the data block 2 'can be satisfied.

That is, when the data block 1 and the data block 2 have the same minimum target reception quality, focusing on the data block in which the reduction amount of the target reception quality per unit time is smaller, By performing control, even if data blocks having different target data qualities are multiplexed on the same channel for communication, control must be performed so that all data blocks satisfy the required data quality. Can be. That is,
Assuming that a common multiple of the lengths of all data blocks is T, the number of data blocks k included in T is Nk, and the amount of reduction in target reception quality is Δdownk, Nk × Δdownk /
Conventional control may be performed by focusing on the data block in which T is minimum.

Next, control for determining the target reception quality will be described with reference to the flowchart shown in FIG. Step (hereinafter S
151), a common multiple T of the length of the data block
For each data block, the parameters of the target quality increase amount Δup, the decrease amount Δdown, and the number N of data blocks per T time are determined, and for example, the parameters of the data block 1 are set among the determined parameters. ST15
Move to 2. Here, a case where control is performed focusing on the data block 1 will be described first. In ST152, the presence or absence of an error in the data block 1 is checked, and while an error occurs, the target reception quality is increased by Δup from the control initial value. When no error occurs in data block 1, ST
Move to 153. In ST153, it is determined whether or not an error has occurred in a data block other than the data block 1 of interest. If there is a data block in which an error has occurred, the process proceeds to ST154, and the data block in which the error has occurred is determined. If not, the process moves to ST155. In ST154, the data block of interest is switched from data block 1 to the data block in which an error has occurred, and the target reception quality of the switched data block is increased. In ST155, the target quality is reduced by the target quality reduction amount Δdown of the data block of interest, and the process proceeds to ST156. In ST156, error detection is performed on all data blocks. If an error has occurred, the process proceeds to ST157, and if no error has occurred, the process proceeds to ST155, where the target quality reduction amount Δdown of the data block of interest is Δdown. To lower the target quality. In ST157, it is determined whether or not there are a plurality of data blocks in which an error has occurred. If there are a plurality of data blocks, the process proceeds to ST158. Conversely, if an error occurs in only one data block, the process proceeds to ST159. ST
At 158, the data block of interest is changed to a data block that minimizes N × Δdown / T. In ST159,
The target reception quality is increased by the target quality increase amount Δup of the data block of interest, and the process shifts to ST155.

As described above, according to the present embodiment, attention is paid to the data block that first becomes erroneous when the target reception quality is lowered, and if errors occur simultaneously, the target reception quality per unit time is reduced. By controlling the target reception quality by focusing on the data block having the smallest reduction amount, even when one user simultaneously communicates a large number of data blocks of different periods with different required data qualities on one channel at the same time, Control such that the data block satisfies the target data quality can be realized by the simple processing described above, and even when the data block to be focused on changes due to the communication environment and the like, all the data can be controlled in exactly the same way. Control can be performed such that the block satisfies the target data quality.

Even when the data block to be focused on changes depending on the communication environment, etc., the above method can be used.
The required data quality of all data blocks can be satisfied at any time. Once you have determined the data blocks to focus on,
The rest of the process is the same as the conventional process, and the control method is simple and practical.

In the present embodiment, the SIR was measured to check the reception quality. However, the present invention is not limited to this, and the received electric field strength, the desired wave reception power, the reception signal power versus the interference power + noise power The reception quality may be checked by measuring the ratio or the like.

(Embodiment 2) The closer the initial value of the target reception quality of the outer loop transmission power control is to the actually converged target reception quality, the faster the convergence. Therefore, it is necessary to set the initial value to an appropriate value for quick convergence.
However, the target reception quality that converges depends on the communication environment such as required data quality, fading frequency (ie, moving speed), interleave length, rate matching ratio, and error control method. Therefore, in the present embodiment, the time required until the target reception quality converges is reduced by setting an optimal initial value according to the communication environment. Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG.
FIG. 9 is a block diagram showing a configuration of a wireless communication device according to Embodiment 2 of the present invention. In FIG. 6, the same parts as those in FIG. 2 are denoted by the same reference numerals as those in FIG. 2, and detailed description will be omitted.

Referring to FIG. 6, a target reception quality initial value setting section 201 includes a target reception quality and required data quality, a fading frequency (ie, moving speed), an interleave length, a rate matching ratio, an error control method, etc., which have been checked in advance. Table (not shown) showing the relationship with the communication environment
To memorize it.

As an example of the relationship between the target reception quality and the communication environment, the measurement results of the required data quality (BLER) and the target reception quality for satisfying the data quality are shown in FIG.
Shown in From this figure, the required data quality (BLE
It can be seen that the converged target reception quality differs depending on R). The target reception quality initial value setting unit 201 stores the correspondences checked in advance as shown in FIG. 7 in a table, and determines an initial value of the target reception quality with reference to the table.

When the communication is actually started, the target reception quality initial value setting unit 201 receives a symbol rate, an interleave length, a rate matching ratio, an error control method, a fading frequency, etc. The information indicating the communication environment is input. The target reception quality initial value setting unit 201 refers to the stored table to select a target reception quality corresponding to the input information indicating the communication environment, and sets the selected target reception quality as a control initial value.

Further, when there are a plurality of data blocks, the above control initial value is obtained for each data block, and the one having the highest reception quality among them is set as the control initial value.

As described above, the control initial value corresponding to the communication environment at the time of control is determined with reference to the correspondence relationship between the target reception quality and the communication environment which has been checked and stored in advance, so that the communication environment can be controlled in any communication environment. Even so, appropriate transmission power control can be performed quickly. Therefore, desired communication data quality can be obtained quickly.

(Embodiment 3) The target reception quality is controlled by the outer loop transmission power control by adjusting the amount of one update (increase or decrease) of the target reception quality so that the tracking performance and the stability are improved. Adjustments are possible. In other words, if the amount of one update is increased, the convergence target can be quickly approached, so that even if the communication environment changes significantly, the target reception quality can be controlled by following the change. Conversely, if the amount of one update is reduced, the fluctuation width after the convergence is once small, so that a value close to the convergence target can be stably obtained.

The optimum value of the update amount depends on the speed of change of factors such as the communication environment. For example, when the moving speed of the mobile device changes frequently, the optimal target reception quality also changes frequently in accordance with the change, so that the followability is emphasized. Similarly, when there is a channel whose symbol rate or the like frequently changes, the tracking performance is emphasized because the optimal target reception quality frequently changes.

In view of the above, in the present embodiment, the optimum value of the update amount per one time of the target reception quality is determined according to the speed of fluctuation of the communication environment and the like. FIG. 8 is a block diagram showing a configuration of a wireless communication apparatus according to Embodiment 3 of the present invention. In FIG. 8, the same parts as those in FIG. 2 are denoted by the same reference numerals as those in FIG.

In FIG. 8, the target quality update amount setting unit 30
In 1, thresholds of fading frequency, symbol rate, interleave length, rate matching ratio, and the amount of change per unit time of the error control method, which are factors that change the target reception quality, are set. The target quality update amount setting unit 301 stores in a table (not shown) the relationship between the threshold determination result checked in advance and the optimal value of the target reception quality update per one time, and stores this table in the table. The optimum value of the update amount per one time of the target reception quality is determined with reference to the reference value.

When the communication is actually started, the target quality update amount setting section 301 sends a symbol rate, an interleave length, a rate matching ratio, an error control method, a fading frequency and the like used by the receiving section 102 to the target section 102. Information is entered. Then, the input information is subjected to threshold determination with each threshold, and the optimum value of the update amount corresponding to the threshold determination result is read from the table. The target reception quality control unit 105 controls the target reception quality according to the read update amount.

As described above, the threshold amount is determined for the change per unit time of the fading frequency, symbol rate, interleave length, rate matching ratio, and error control method, which are factors that change the target reception quality. Since the optimal value of the update amount per time is calculated, regardless of the speed of change of the factors that change the target reception quality such as the communication environment,
Appropriate transmission power control can be performed quickly, and a desired communication data quality can be obtained stably.

As shown in the first embodiment, Δup ·
Assuming that the amount of increase or decrease of the target reception quality is determined on the condition that target BLER = Δdown · (1−target BLER), the value of Δdown can be uniquely determined by storing the value of Δup. Under such conditions, when communication is actually started, information on the symbol rate, interleave length, rate matching ratio, and error control method used in communication is collected from the demodulation unit, and the fading frequency at that time is collected. By extracting from the demodulation result of the demodulation unit, the amount of one update of the stored target reception quality, that is, Δup is selected and set. Also, when there are multiple data blocks,
What is necessary is just to change and set Δup of all the data blocks at a fixed ratio.

(Embodiment 4) Conventionally, transmission power control includes outer loop transmission power control for determining a target reception quality based on the quality of received data, and closed-loop control for maintaining a set target reception quality. This is realized by a combination of transmission power control. At this time, the respective transmission power control operations assume normal operations, and if either control does not operate normally, the transmission power control does not operate properly as a whole.

FIG. 10 is a diagram illustrating control of target reception quality according to Embodiment 4 of the present invention. As shown in FIG. 10, there is a case where the communication partner cannot perform the closed-loop transmission power control for some reason, for example, a limitation on the maximum transmission power allocated to the user (section S in FIG. 10). In such a case, since the received data cannot maintain the desired quality, the target reception quality is diverged by the outer loop transmission power control as in the non-limiter control E shown in FIG. When transmission power control becomes possible, the time (section in FIG. 12U) in which a value largely deviating from an appropriate target reception quality is set longer. During that time, transmission is not performed with the correct transmission power.

Also, when a service in which data blocks are transmitted in bursts, such as packet communication, is used, when data blocks are not transmitted, BLE is used.
Since R cannot be measured correctly, outer loop transmission power control may not be performed. If the target reception quality is continuously increased or decreased while the BLER cannot be measured correctly, when the transmission of the data block is started again, a value that largely deviates from the appropriate target reception quality is set. Power control cannot be performed.

Therefore, in the present embodiment, a threshold value is set for one or both of the upper limit and the lower limit of the target reception quality so that the target reception quality does not largely deviate from an appropriate value. At this time, the threshold set as the upper limit of the target reception quality is referred to as an upper threshold, and the threshold set as the lower is referred to as a lower threshold. In the present embodiment, a case will be described in which threshold determination is performed using only the upper threshold. Hereinafter, the present embodiment will be described with reference to FIGS. 9 and 10. FIG. 9 is a block diagram showing a configuration of a transmission power control method according to Embodiment 4 of the present invention. In FIG. 9, the same parts as those in FIG. 2 are denoted by the same reference numerals as those in FIG. 2, and detailed description will be omitted.

In FIG. 9, a target quality threshold value setting unit 401
Performs a threshold determination on the target reception quality output from the target reception quality control unit 105 using an upper threshold. The upper threshold value and the lower threshold value are changed by factors such as a fading frequency, a symbol rate, an interleave length, a rate matching ratio, and an error control method, like the control initial value. Therefore, the upper limit threshold value and the lower limit threshold value of the target reception quality corresponding to them are stored in advance in a table (not shown) provided in the target quality threshold value setting unit 401.

When the communication is actually started, the target reception quality control section 105 sets the target reception quality and notifies the target quality threshold setting section 401 of the set target reception quality. The target quality threshold setting unit 401 receives, from the reception unit 102, information on a symbol rate, an interleave length, a rate matching ratio, an error control method, and a fading frequency used in communication. Target quality threshold setting unit 401
In the table, the target reception quality threshold corresponding to the input information is selected with reference to the table, and the target reception quality notified by the target reception quality control unit 105 is determined based on the selected threshold. As a result of the threshold determination, if the target reception quality is equal to or higher than the upper threshold, the target reception quality controller 105 newly sets the upper threshold as the target reception quality. On the other hand, when the target reception quality is equal to or lower than the lower threshold, the lower threshold is newly set as the target reception quality.

FIG. 10 is a diagram illustrating control of target reception quality according to Embodiment 4 of the present invention. FIG. 10 shows how the target reception quality is controlled when the upper threshold is set. As shown in this figure, the upper limit threshold value of the target reception quality is set, and no further target reception quality is set as in the limiter control F. Therefore, the time for setting the inappropriate target reception quality is also short. Thus, the target reception quality can be quickly converged (section V in FIG. 10).

When there are a plurality of data blocks,
The aforementioned limiter value processing is performed on the data block of interest. However, if all data blocks are not burst-transmitted, the data block of interest may be selected from data blocks that are continuously transmitted.

As described above, by providing the target quality threshold value setting unit 401, even when the communication partner cannot increase the transmission power for some reason or when the data block is not transmitted and a block error cannot be detected, the target quality threshold value setting unit 401 can be used. Prevents erroneous control of reception quality, enables control of the transmission power of the communication partner, or when a data block is transmitted again,
Transmission with appropriate transmission power can be performed quickly, and desired communication data quality can be obtained quickly.

(Embodiment 5) In the closed loop transmission power control, the reception quality is measured in a short cycle, and the transmission quality is transmitted to a communication partner so that the reception quality approaches the target reception quality set by the outer loop transmission power control. Send a power control command. However, the reception quality may fluctuate rapidly depending on the communication environment, and may greatly deviate from the target reception quality.

For example, when a blocking object appears between the mobile station and the base station (shadowing), the reception quality rapidly deteriorates. At this time, control to approach the target reception quality is performed by closed-loop transmission power control. In this case,
Since an error occurs in the data block, the set target reception quality itself becomes large, and appropriate transmission power control cannot be performed.

FIG. 12 is a diagram illustrating control of target reception quality according to Embodiment 5 of the present invention. Hereinafter, FIG.
The control of the target reception quality will be described using FIG. When performing the conventional outer loop transmission power control, if the reception quality suddenly decreases due to shadowing or the like, as shown in the conventional outer loop closing and loop transmission power control X, the transmission power is rapidly increased and the reception is performed. Transmission power control is performed to bring the quality closer to the target reception quality. On the other hand, as shown in the conventional outer loop transmission power control Y, when shadowing or the like occurs, an error occurs in the data, and even if the target reception quality is significantly different from the measured reception quality, a control to increase the target reception quality is performed. will have to go.

If the target reception quality is significantly different from the measured reception quality due to shadowing, the target reception quality is correct, the control of the closed-loop transmission power control cannot follow the fluctuation of the communication environment, and the target quality cannot be achieved. It is considered that the reception quality has deteriorated due to the lack of the reception. Therefore, there is no need to perform control to increase the target reception quality.

Therefore, in the present embodiment, if the state in which the closed-loop transmission power control deviates greatly from the target value occurs for a certain period of time or more, the target reception quality is not updated in that section. By doing
Keep the target reception quality at the correct value.

FIG. 11 is a block diagram showing a configuration of a radio communication apparatus according to Embodiment 5 of the present invention. Note that FIG.
In FIG. 7, the same parts as those in FIG. 2 are denoted by the same reference numerals as in FIG.

In FIG. 11, measured reception quality monitoring section 50
1 monitors the measured reception quality measured by the reception quality measurement unit and the target reception quality set by the target reception quality control unit 105, and outputs a signal for controlling the update of the target reception quality. As a result, even if a data block error occurs at a reception quality that is significantly lower than the target reception quality, as in Z indicating the outer loop transmission power control when the measured reception quality is monitored in FIG. No action is taken to increase the reception quality.

As described above, the measured reception quality and the target reception quality are monitored, and the reception quality controlled by the closed-loop transmission power control due to the rapid fluctuation of the reception quality is determined by the algorithm shown in the flow chart of FIG. If the state greatly different from the set target reception quality continues for a certain period of time, by controlling not to update the target reception quality, the target reception quality value can be stabilized to a value in an appropriate range, and Transmission power control can be performed.

[0083]

As described above, according to the present invention,
Even when communication is performed by multiplexing a plurality of types of data on the same channel, appropriate transmission power control can be performed.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a communication system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a wireless communication apparatus according to Embodiment 1 of the present invention.

FIG. 3 is a diagram illustrating control of target reception quality according to Embodiment 1 of the present invention.

FIG. 4 is a diagram illustrating control of target reception quality according to Embodiment 1 of the present invention.

FIG. 5 is a flowchart showing an algorithm for controlling target reception quality according to Embodiment 1 of the present invention;

FIG. 6 is a block diagram showing a configuration of a wireless communication apparatus according to Embodiment 2 of the present invention.

FIG. 7 is a diagram showing a measurement result of a relationship between required data quality (BLER) and target reception quality for satisfying the data quality;

FIG. 8 is a block diagram showing a configuration of a wireless communication apparatus according to Embodiment 3 of the present invention.

FIG. 9 is a block diagram showing a configuration of a transmission power control method according to Embodiment 4 of the present invention.

FIG. 10 is a diagram illustrating control of target reception quality according to Embodiment 4 of the present invention.

FIG. 11 is a block diagram showing a configuration of a wireless communication apparatus according to Embodiment 5 of the present invention.

FIG. 12 is a diagram illustrating control of target reception quality according to Embodiment 5 of the present invention.

FIG. 13 is a block diagram illustrating a configuration of a conventional wireless communication apparatus that performs outer loop transmission power control.

[Explanation of symbols]

 103 Reception Quality Measurement Units 104-1 to 104-3 Data Quality Measurement Unit 105 Target Reception Quality Control Unit 106 Transmission Power Control Command Generation Unit 201 Target Reception Quality Initial Value Setting Unit 301 Target Quality Update Quantity Setting Unit 401 Target Quality Threshold Setting Unit 501 Measurement reception quality monitoring unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K022 EE01 EE12 EE24 5K060 BB07 CC04 FF00 LL01 5K067 AA23 BB21 CC10 DD11 DD51 EE02 EE10 FF02 GG08 GG09 HH22 HH23 KK15

Claims (12)

[Claims] 1. A wireless receiving means for wirelessly receiving a signal including data of at least two services having different required data qualities, a data quality measuring means for measuring data quality for each data, and a received signal includes Target reception quality control means for controlling target reception quality so that data of a service requiring the highest data quality among the data satisfies the required data quality, and closed-loop transmission power control using the target reception quality And a transmission power control means for performing the following. 2. An error detection means for detecting an error in data, wherein the target reception quality control means selects service data requiring the highest data quality among the data included in the received signal, and selects the data. The method according to claim 1, wherein the target reception quality is increased by a predetermined amount when an error of the detected data is detected by the error detection means, and the target reception quality is reduced by a predetermined amount when no error is detected. The wireless communication device according to claim 1. 3. An error detection means for detecting an error in data, wherein the target reception quality control means includes a target reception quality control means for detecting an error in data of two or more services at the same time in the error detection means. Among the included data, the data of the service with the smallest transmission power reduction rate per unit time is selected, and when an error of the selected data is detected by the error detection means, the target reception quality is increased by a predetermined amount, and 2. The wireless communication apparatus according to claim 1, wherein when no is detected, the target reception quality is reduced by a predetermined amount. 4. The target reception quality control means, if the error detection means does not detect data errors of two or more services at the same time, a service requiring the highest data quality among the data included in the received signal. If the error detection means detects data errors of two or more services at the same time, the data having the smallest transmission power reduction rate per unit time among the data included in the received signal is selected. And in the error detecting means,
The method according to claim 2, wherein the target reception quality is increased by a predetermined amount when an error of the selected data is detected, and the target reception quality is reduced by a predetermined amount when no error is detected. The wireless communication device according to claim 1. 5. A correspondence relationship between a target reception quality and a parameter indicating a communication environment is stored in advance, and a target reception quality corresponding to a communication environment at the time of controlling the target reception quality from the stored target reception qualities. 5. The wireless communication apparatus according to claim 1, further comprising: a target reception quality initial value setting unit that selects the target reception quality as a control initial value. 6. 6. A target quality update amount setting means for determining a change amount per unit time of a parameter indicating a communication environment by a threshold value and obtaining an optimum value of an update amount per target reception quality according to the threshold determination result. 2. The method according to claim 1, further comprising:
The wireless communication device according to any one of claims 1 to 4. 7. A threshold value is set according to a parameter indicating a communication environment, a target reception quality set by a target reception quality control means is determined by the threshold value, and a target reception quality control means is determined according to the threshold value determination result. The wireless communication apparatus according to any one of claims 1 to 4, further comprising target quality threshold processing means for setting the target reception quality set in (1) or the threshold as the target reception quality. 8. The system according to claim 5, wherein the parameter indicating the communication environment is at least one selected from the group consisting of a moving speed, a fading frequency, an interleave length, a rate matching ratio, and an error control method. The wireless communication device according to any one of claims 1 to 7. 9. A monitoring means for monitoring a difference between the reception quality of the received signal and a target reception quality set by the target reception quality control means, wherein the target reception quality control means checks whether the difference monitored by the monitoring means is equal to the difference. 5. The wireless communication apparatus according to claim 1, wherein the target reception quality is not updated when the target reception quality is equal to or more than the unique value. 10. A wireless communication terminal device comprising the wireless communication device according to claim 1. Description: 11. A wireless base station apparatus comprising the wireless communication apparatus according to claim 1. Description: 12. Wirelessly receiving a signal including data of at least two services having different required data qualities,
The data quality is measured for each data, the data of the service that requires the highest data quality among the data included in the received signal, the target reception quality is controlled so as to satisfy the required data quality, the target reception quality, A transmission power control method comprising performing closed-loop transmission power control using reception quality.