JP4939453B2 - Transmission power control device - Google Patents

Description

  The present invention relates to, for example, a transmission power control device provided in a mobile terminal device or the like, and in particular, close to a target block error rate (BLER: Block Error Rate) to which reception quality of received data is given. The present invention relates to a transmission power control apparatus that performs outer loop transmission power control for updating a signal to interference ratio (SIR) used for inner loop transmission power control.

For example, in a mobile communication system, radio communication is performed between a radio base station apparatus and a radio terminal apparatus using a CDMA (Code Division Multiple Access) method using a spread code. In such a mobile communication system, for example, transmission power is controlled during wireless communication. As a specific example, information (for example, a TPC (Transmit Power Control) command for controlling transmission power with respect to the other communication device based on the quality of the signal received from the other communication device by one communication device) ) And the other communication device changes the transmission power based on the notified information.
Hereinafter, transmission power control in the mobile terminal device will be described as an example, but the same configuration and operation can be applied to other devices such as a radio base station device.

FIG. 6 shows a configuration example of a transmission power control device provided in a mobile terminal device that performs transmission power control.
The baseband (BB) transmission signal output processing unit includes a plurality (two in this example) of encoding units 101-1 and 101-2 that encode transmission data for each data series, and encoded transmission. A data multiplexing unit 102 that multiplexes data, inserts radio section control data such as pilot bits and a TPC (Transmit Power Control) command into the multiplexed data, generates a transmission data frame, and transmits it to the radio section A physical channel mapping unit 103 that performs mapping to a physical channel (physical CH) and a primary change such as QPSK (Quadrature Phase Shift Keying) or 16QAM (16 Quadrature Amplitude Modulation) on the mapped physical channel signal. A modulator 104 for, and a spreading section 105 for spreading modulation using a spreading code for each call.

  The baseband (BB) received signal processing unit performs despreading on the BB received signal using a reference code for each call while shifting the phase of the reference code, and extracts a received signal path of the call. The despreading unit 112 that performs despreading on the path position extracted by the path search unit 111 and extracts received symbols, and the reception quality using the received symbols for each call extracted by the despreading unit 112 SIR measuring section 113 for measuring (SIR), synchronous detection RAKE section 114 for performing synchronous detection and RAKE combining on the received symbol extracted by despreading section 112, and synchronous detection and RAKE combining are performed. A data determination unit 115 that determines received symbols, and a data that separates the determination result output from the data determination unit 115 for each radio section control data or data series. The separation unit 116, a plurality (two in this example) of data decoding units 117-1 and 117-2 that decode the data separated by the data separation unit 116 for each data series, and so-called among the data series A TargetSIR control unit 118 that updates the TargetSIR using a decoding result of a sequence in which user data is transmitted, and an insertion TPC that determines an insertion TPC command from the SIR measured by the SIR measurement unit 113 and the TargetSIR given from the TargetSIR control unit 118 The generation unit 119 is configured.

An example of operation | movement of the transmission power control apparatus shown by FIG. 6 is shown.
The transmission user data encoded by the data encoding units 101-1 and 101-2 is input to the data multiplexing unit 102. The data multiplexing unit 102 multiplexes the data encoded by the data encoding units 101-1 and 101-2. The multiplexed transmission data is input to the physical channel mapping unit 103. The physical channel mapping unit 103 inserts radio section control data such as pilot bits for synchronous detection and a TPC command into the multiplexed data to generate a transmission data frame, and transmits a physical channel ( Mapping to the code channel). The transmission data that has been framed and mapped to the physical channel by the physical channel mapping unit 103 is modulated by the modulation unit 104, spread by the spreading unit 105, and output as a BB transmission signal.

Here, a unique sequence known to both the base station apparatus and the terminal apparatus is inserted as the pilot bit based on the system timing of the corresponding call.
Further, for the TPC command, for example, the SIR is measured from the radio section control data received by the terminal device side, and the TPC to be inserted is determined and generated by the insertion TPC generation unit 119 according to the measurement result. In general, the Target SIR and the measured SIR of the corresponding call are compared, and a DOWN command is generated when (Measured SIR> Target SIR), and an UP command is generated when (Measured SIR <Target SIR).

On the other hand, the received BB reception signal is first subjected to path timing extraction by the path search unit 111. In path extraction, for example, using the reference code for the corresponding call, despreading (correlation calculation) while shifting the phase of the reference code, and when the correlation value exceeds the threshold, the timing is determined as the path timing To do. The despreading unit 112 performs despreading on the path extracted by the path search unit 111.
Using the received symbol after despreading, the SIR measurement unit 113 obtains the reception quality (SIR) for each call. This SIR corresponds to the above-described measurement SIR and is used for determining the insertion TPC in the insertion TPC generation unit 119.

  Also, synchronous detection and RAKE combining are performed on the received symbol after despreading by the synchronous detection RAKE unit 114. The symbol after the synchronous detection and RAKE combination is input to the data determination unit 115. The data determination unit 115 performs data determination, and the data separation unit 116 performs data separation that separates the wireless section control data and data series. Each data series after separation is decoded by each data decoding section 117-1 and 117-2 to obtain respective data. Further, the TargetSIR control unit 118 performs a process of updating the TargetSIR using a decoding result of a sequence in which so-called user data is transmitted among the data sequences.

The above is an example of the operation of the portable terminal device in the prior art.
Next, a transmission power control method in the mobile terminal device will be described in detail.
Since there is a change in the propagation environment during communication, the SIR necessary to obtain the desired BLER is not constant. In order to cope with this change, the BLER is observed, and when the observed value is worse than the target BLER or when CRC (Cyclic Redundancy Check) NG (failure) occurs, the target SIR is increased, and the observed value is increased. When it is better than the target BLER or when it is confirmed that the CRC is OK (success), control is performed to decrease the target SIR.
Control in which the target SIR is changed in order to realize the desired BLER in this way is well known as outer loop transmission power control. In the example shown in FIG. 6, the TargetSIR is updated using the decoding result of the user data series (for example, CRC OK or NG).

JP 2005-159696 A JP 2005-236709 A

However, the conventional transmission power control method and outer loop control method have the following problems.
Immediately after the call connection, necessary control data is frequently transmitted and received between the mobile station device (for example, a mobile terminal device) and the base station device for the user to communicate. Specifically, control information for performing call connection is transmitted from the base station apparatus side to the mobile station apparatus side as one of the data series. The control data series in FIG. 6 corresponds to this.

FIG. 7 shows an example of the operation of the TargetSIR control unit 118, where the horizontal axis represents time (t), the vertical axis represents TargetSIR, and an example of the transition of TargetSIR over time. The update period of TargetSIR is T.
As shown in FIG. 7, in the initial state of the outer loop immediately after the call connection, the target SIR starts from the initial Target SIR, and the Target SIR is rapidly updated to the minus (−) side so that the CRC-NG in the user data series appears and is steady. Control to make a state is performed.

At this time, as shown in FIG. 7, when the CRC-NG generation point of the user data is lower than the CRC-NG generation point of the control data, the TargetSIR is the CRC-NG generation level of the control data. (To the minus side), the user data reaches a level where CRC-NG is generated, and a steady state is reached. However, since control data is often transmitted and received in the initial state, there is a possibility that the target control data may be missed in the area where the Target SIR is below the CRC-NG generation point of the control data.
Further, even in a steady state, it is considered that there is a possibility that the control data during steady communication may be missed in the conventional method in which TargetSIR is controlled by focusing only on user data.

The present invention has been made in view of such a conventional situation. For example, an outer loop that updates TargetSIR used for inner loop transmission power control so as to approach TargetBLER to which reception quality of received data is given. An object of the present invention is to provide a transmission power control apparatus capable of realizing good transmission power control when performing transmission power control.
Specifically, in the present invention, for example, when performing transmission power control using both inner loop transmission power control and outer loop transmission power control, the data series including control data communicated at the same time is more than desired. It is an object of the present invention to provide a transmission power control apparatus that can ensure quality.

In order to achieve the above object, in the present invention, the target signal quality (target) used for inner loop transmission power control is set so that the data quality of received data approaches the target data quality (target data quality). A transmission power control apparatus that performs outer loop transmission power control for updating (signal quality) has the following configuration.
That is, the data decoding means decodes the received data for each data series. The physical channel quality detection means detects the quality of the physical channel from which the data is received based on predetermined information included in the received data or a decoding result by the data decoding means for the received data. . The data quality detection unit detects the data quality in a predetermined time interval for each data series based on the decoding result by the data decoding unit. The data quality comparison means compares the data quality detected by the data quality detection means with the target data quality for each data series. The coefficient determining means is based on the physical channel quality and the physical channel quality detected by the physical channel quality detecting means based on the correspondence between the detected data quality and the comparison result of the target data quality and the coefficient. And the coefficient corresponding to the combination of the comparison results by the data quality comparison means is determined for each data series. Coefficient combining means combines (for example, adds) the coefficients for each data series determined by the coefficient determining means for a plurality of data series. A target signal quality update unit updates the target signal quality based on the synthesis result by the coefficient synthesis unit.

  Therefore, for example, when performing outer loop transmission power control for updating TargetSIR used for inner loop transmission power control so that the reception quality of received data is close to Target BLER, good transmission power control is performed. Can be realized. Specifically, for example, when performing transmission power control using both inner loop transmission power control and outer loop transmission power control, a data quality that is higher than desired is ensured for a data sequence including control data communicated simultaneously. be able to.

Here, as the signal quality, for example, the value of SIR can be used.
As the physical channel quality, for example, the BER value can be used for data before decoding (before error correction).
As the data quality, for example, the value of BLER can be used for data after decoding (after error correction).
Further, as the target data quality, for example, a constant value may be set in advance, or may be set variably according to a predetermined condition set in advance or by an instruction by a user (person). .

As the data series, for example, a user data series or a control data series can be used.
Various methods may be used for detecting the quality of the physical channel. For example, predetermined information such as pilot bits included in the received data and reference to the pilot bits set in advance are referred to. A method for detecting the quality of the physical channel by comparing with the bit information, or the quality of the physical channel by comparing the data before decoding and the data after decoding for received data related to one or more data series Or a method using both of these methods, such as averaging the results of both of these methods.

In addition, various data may be used as the predetermined time interval when detecting the data quality in the predetermined time interval. For example, a time interval that is a multiple of the time interval corresponding to one data block is used. Can be used.
As the data quality, for example, the CRC determination result (OK or NG) can be cumulatively detected.

  Various combinations of the physical channel quality and the comparison result between the detected data quality and the target data quality may be used. For example, a plurality of areas regarding the physical channel quality (for example, BER) may be used. (Stage) is provided, and the data quality (for example, BLER) is compared with the target data quality as a comparison result, and a combination of each of the plurality of regions and each of the comparison results is used. Can do. Such a combination is associated with a coefficient for updating the target signal quality.

  Various methods may be used as a method for updating the target signal quality based on the coefficient synthesis result. For example, when the reception state is generally considered to be good, the target signal quality is reduced. When the reception state is generally considered to be poor, a method for increasing the target signal quality can be used.

Hereinafter, (Configuration Example 1) and (Configuration Example 2) will be shown as configuration examples related to the present invention.
(Configuration Example 1) Outer loop for updating target signal quality (hereinafter, TargetSIR) used for inner loop transmission power control so that reception quality of received data approaches a given target data quality (hereinafter, TargetBLER) In a transmission power control method and a transmission power control apparatus for performing transmission power control,
A plurality of decoding means for decoding received data for each received data series;
Means for estimating the quality of a physical channel that has received the data from radio section control data such as decoding results and pilot bits of the decoding means;
Means for measuring, for each data series, data quality in an arbitrary time interval of the data series from the decoding result of the decoding means;
Means for comparing the measured data quality with the Target BLER and outputting a comparison result;
Means for determining and outputting an adjustment coefficient for updating the TargetSIR from the comparison result output with the target BLER for each of the stages according to the estimated physical channel quality;
Means for synthesizing the adjustment coefficient for each data series;
Means for updating the TargetSIR using the adjustment factor after synthesis;
A transmission power control method and a transmission power control apparatus.

(Configuration example 2) Encoding means for encoding transmission data for each data series;
Data multiplexing means for time-multiplexing the encoded data;
Physical channel mapping means for generating a transmission data frame by inserting radio section control data such as pilot bits and TPC commands into the multiplexed data, and mapping to a physical channel for transmission in the radio section;
Means for performing primary modulation such as QPSK and 16QAM on the mapped physical channel signal;
Means for performing spread modulation using a spread code for each call;
Path search means for extracting a received signal path of a call from a baseband received signal using a reference code for each call;
Means for performing despreading on the extracted path position;
SIR measurement means for measuring the signal quality (SIR) from the received symbol after despreading;
Synchronous detection RAKE means for performing synchronous detection RAKE combining on the received symbols after despreading;
Means for determining a reception signal obtained by synthesizing the synchronous detection RAKE;
Data separation means for separating the determined data for each radio section control data and data series;
Power control means for performing the power control processing described in (Configuration Example 1) using the separated received data;
The transmission power control method and the transmission power control apparatus according to (Configuration Example 1), characterized in that

  As described above, according to the transmission power control according to the present invention, the outer loop transmission for updating the target signal quality used for the inner loop transmission power control so that the data quality of the received data approaches the target data quality. When performing power control, good transmission power control can be realized. Specifically, for example, when performing transmission power control using both inner loop transmission power control and outer loop transmission power control, communication is performed simultaneously. As for the data series including the control data to be processed, it is possible to ensure data quality more than desired.

Embodiments according to the present invention will be described with reference to the drawings.
In addition, although a transmission power control in a portable terminal device is described as an example in the present embodiment, a similar configuration and operation can be applied to other devices such as a radio base station device.

FIG. 1 shows a configuration example of a transmission power control apparatus provided in a mobile terminal apparatus that performs transmission power control according to an embodiment of the present invention.
The transmission power control apparatus of this example includes a plurality (two shown in this example) of data encoding units 1-1 and 1-2, a data multiplexing unit 2, a physical channel mapping unit 3, and a modulation unit. 4, spreading unit 5, path search unit 11, despreading unit 12, SIR measurement unit 13, synchronous detection RAKE unit 14, data determination unit 15, data separation unit 16, and a plurality (in this example) Data decoding units 17-1 and 17-2, a physical channel BER (Bit Error Rate) estimation unit 18, a TargetSIR control unit 19, and an insertion TPC generation unit 20.

Each of the data encoding units 1-1 and 1-2 encodes transmission data.
The data multiplexing unit 2 performs time multiplexing of the encoded transmission data.
The physical channel mapping unit 3 generates transmission data frames by inserting wireless section control data such as pilot bits and TPC commands into the multiplexed data, and performs mapping to physical channels for transmission in the wireless section .
The modulation unit 4 performs primary modulation such as QPSK and 16QAM on the mapped physical channel data.
The spreading unit 5 performs spreading modulation using a spreading code for each call.

The path search unit 11 extracts a call reception signal path from the BB reception signal using a reference code for each call.
The despreading unit 12 performs despreading on the position of the path extracted by the path search unit 11.
The SIR measurement unit 13 measures the reception quality (SIR in this example) using the reception symbol for each call extracted by the despreading unit 12.

The synchronous detection RAKE unit 14 performs synchronous detection and RAKE combining on the received symbols for each call extracted by the despreading unit 12.
The data determination unit 15 determines a reception signal that has been subjected to synchronous detection and RAKE synthesis.
The data separation unit 16 separates the output from the data determination unit 15 for each radio section control data and data series.

Each of the data decoding units 17-1 and 17-2 decodes the data separated by the data separation unit 16 for each data series. In this example, the data decoding unit 17-1 corresponds to the user data series, and the data decoding unit 17-2 corresponds to the control data series.
The physical channel BER estimation unit 18 uses the radio section control data such as pilot bits separated by the data separation unit 16 and the decoding results from the plurality of data decoding units 17-1 and 17-2 to process the data. Estimate the quality of the received physical channel.

The TargetSIR control unit 19 measures the reception quality of the current data series from the decoding results of the data from the plurality of data decoding units 17-1 and 17-2, and determines the measured value and the target quality such as TargetBLER. The target SIR for the inner loop is updated using the comparison result and the physical channel BER estimation value output from the physical channel BER estimation unit 18.
The insertion TPC generation unit 20 determines an insertion TPC command from the measured SIR and the given Target SIR.

Next, an example of operation | movement of the transmission power control apparatus of this example is shown.
The transmission data is encoded by the data encoding units 1-1 and 1-2 for each transmission data series, and time-multiplexed by the data multiplexing unit 2. The multiplexed transmission data is input to the physical channel mapping unit 3 to insert a radio section control data such as a pilot bit and a TPC command to generate a transmission data frame, and to transmit a physical channel ( Mapping to a code channel) and output. The modulated physical channel data is subjected to primary modulation such as QPSK or 16QAM, for example, by the modulation unit 4, and the spread unit 5 performs spread modulation using a spread code for each call and outputs it as a BB transmission signal. Is done.

  On the other hand, for the received BB reception signal, the path search unit 11 first extracts the path timing. In path extraction, for example, despreading (correlation calculation) is performed while shifting the phase of the reference code using the reference code for the corresponding call, and when the correlation value exceeds a threshold value, the timing is determined as the path timing. . The despreading unit 12 performs despreading on the path extracted by the path search unit 11. Using the received symbol after despreading, the SIR measurement unit 13 obtains the reception quality (SIR in this example) for each call.

  The received symbol after despreading is synchronously detected and RAKE combined by the synchronous detection RAKE combining unit 14. The received symbol after the synchronous detection and RAKE combination is input to the data determination unit 15. The data determination unit 15 performs symbol-to-bit conversion and “0” and “1” binary determination, and the data separation unit 16 performs data separation that separates the wireless section control data and data series. Each separated data series is decoded by the corresponding data decoding units 17-1 and 17-2.

The insertion TPC generation unit 20 determines and generates an insertion TPC using the SIR for each call.
As a specific method, for example, according to the measurement result, in general, the Target SIR and the measurement SIR of the corresponding call are compared, and when (measurement SIR> Target SIR), the transmission power is reduced. A command (DOWN command) is determined and generated and notified to the physical channel mapping unit 3. Conversely, when (measurement SIR <TargetSIR), a command (UP command) for increasing transmission power is determined and generated. The physical channel mapping unit 3 is notified.

The above operation is the same as that shown in FIG. 6 (prior art), for example.
The operations of the data decoding units 17-1 and 17-2, the physical channel BER estimating unit 18, and the Target SIR control unit 19 are particularly characteristic in this example, and will be described in detail below.
Hereinafter, several configuration examples of the Target SIR control unit 19 which is a main part for realizing the transmission power control method of this example will be described and described.

A first embodiment of the present invention will be described.
FIG. 2 shows a configuration example of the Target SIR control unit 19a as a configuration example of the Target SIR control unit 19 shown in FIG. 1, and data decoding units 17-1 and 17-2 and a physical channel BER estimation unit. 18 is shown.
The Target SIR control unit 19a of this example includes a plurality (two shown in this example) of CRC determination units 41-1 and 41-2 and a plurality (two shown in this example) of adjustment coefficient control units 42. -1, 42-2, an adding unit 43, and a TargetSIR update processing unit 44.

Each of the CRC determination units 41-1 and 41-2 determines whether the CRC is OK (success) or NG (failure).
Each adjustment coefficient control unit 42-1 and 42-2 outputs a coefficient (adjustment coefficient) for updating TargetSIR.
The addition unit 43 performs addition processing.
The TargetSIR update processing unit 44 performs a TargetSIR update process.

An example of the operation of the data decoding units 17-1 and 17-2, the physical channel BER estimation unit 18, and the TargetSIR control unit 19a of this example will be shown.
The pilot bit, user data sequence, and control data sequence separated by the data separation unit 16 are input to the physical channel BER estimation unit 18, the data decoding unit 17-1, and the data decoding unit 17-2, respectively.
The data decoding unit 17-1 decodes the user data series. The data decoding unit 17-2 decodes the control data sequence. These decoding results are input to the physical channel BER estimation unit 18, and the decoding results obtained by the data decoding unit 17-1 and the data decoding unit 17-2 are respectively a CRC determination unit 41-1 and a CRC determination unit 41. -2.

The physical channel BER estimation unit 18 performs error correction by comparing, for example, a known reference pilot bit stored in a memory in advance with a received and determined pilot bit, that is, the error rate of the physical channel. Can be estimated. Alternatively, for example, the estimated error rate of the physical channel can be detected by comparing a data sequence before decoding and a sequence obtained by re-encoding the decoded data.
Information on the estimated error rate detected by the physical channel BER estimator 18 is output to the adjustment coefficient controllers 42-1 and 42-2.

The CRC determination units 41-1 and 41-2 determine whether the CRC is OK or NG with respect to the decoding results obtained by the data decoding units 17-1 and 17-2. In this example, it is assumed that a CRC code is attached to the signal received from the transmission side on the transmission side.
In each CRC determination unit 41-1, 41-2, for example, when it is OK, a value of “−1” is output to each adjustment coefficient control unit 42-1, 42-2 according to the CRC determination result, When it is NG, a value of “+1” is output to each of the adjustment coefficient control units 42-1 and 42-2.

With reference to FIG. 3, the operation example of each adjustment coefficient control part 42-1 and 42-2 is demonstrated.
FIG. 3 shows an example of the relationship between the estimated BER and the data series BLER. The horizontal axis represents the estimated BER (physical CH_BER), and the vertical axis represents BLER. In addition, characteristic examples of user data and control data are shown.

  Here, in the example of FIG. 3, an example in which user data and control data are encoded with different encoding methods and encoding rates is shown. In general, due to the difference in the correction capability of the encoding method used, even if the transmission is performed with the same physical channel quality, a difference in BLER after error correction appears. In the example of FIG. 3, the user data sequence has a high correction capability, but a method having a characteristic in which the correction capability rapidly deteriorates when the physical channel characteristic deteriorates is applied, and the control data sequence includes A system having a characteristic capable of maintaining a certain correction capability even when the physical channel characteristic is deteriorated is applied.

  In the transmission power control system of this example, the characteristics of such an encoding system are taken into account, and each adjustment coefficient control unit 42-1 and 42-2 relates to an estimated BER as shown in FIG. 3, for example. Definitions of a plurality of regions (stages) a, b, c, and d are stored in the memory, and any of them is determined based on the estimated error rate (estimated BER in this example) input from the physical channel BER estimating unit 18. The adjustment coefficient output is controlled according to the result.

A specific example is shown with reference to FIG.
FIG. 4 shows an adjustment coefficient output corresponding to each comparison result for each of the areas a, b, c, and d as an example of the operation of each of the adjustment coefficient control units 42-1 and 42-2. The adjustment coefficients are (α <β <γ <0) and (α ′> β ′> γ ′> 0).
As an example, in the region a, it can be determined that the estimated BER is low, that is, the physical channel characteristic is relatively good. Therefore, as shown in FIG. Even if the CRC is NG, control is performed so that the TargetSIR is not updated (the value of the adjustment coefficient output = 0) to prevent excessive quality. On the other hand, if the CRC is OK in the area a, it is determined that there is a margin in quality, and control is performed as (adjustment coefficient output value = α) in order to update the target SIR to be lowered.

As another example, in the region d, it can be determined that the estimated BER is high, that is, the state of the physical channel is relatively bad. Therefore, as shown in FIG. Even if the CRC is OK, control is performed so that the TargetSIR is not updated (adjustment coefficient output value = 0) to prevent deterioration of quality. On the other hand, in the area d, when the CRC is NG, it is determined that the deterioration allowable range is exceeded, and control is performed as (adjustment coefficient output value = α ′) in order to update the target SIR. To do.
For the other regions b and c, the adjustment coefficient output mode between the region a and the region d is used in the same way as described above.

The adding unit 43 adds the adjustment coefficients output from the plurality of adjustment coefficient control units 42-1 and 42-2 based on the decoding result of each data series, and outputs the addition result to the TargetSIR update processing unit 44. To do.
Then, the target SIR update processing unit 44 performs update processing using the added adjustment coefficient added by the adding unit 43. In this update process, for example, (Equation 1) is used. Here, TargetSIR_new is the updated TargetSIR, TargetSIR_old is the TargetSIR before the update, and the post-addition adjustment coefficient is the addition result of the adjustment coefficient by the adder 43.

(Equation 1)
TargetSIR_new
= TargetSIR_old + (adjustment coefficient after addition)
・ ・ (Formula 1)

By the operation as described above, for example, the Target SIR is updated with the result of only the user data series as in the conventional technique, or the Target SIR is updated by paying attention to only one of the user data series and the control data series. Instead of this, in this example, it is possible to update the Target SIR focusing on both sequences.
Further, in this example, regarding the weighting of the control data series and the user data series, for example, by changing α, β, γ, α ′, β ′, γ ′ shown in FIG. Thus, the Target SIR can be updated in consideration of the correction characteristics according to the encoding method. That is, it is possible to absorb the difference in CRC-NG generation point due to the difference in the data sequence encoding method.

  In the configuration of this example, for example, in FIG. 1, Target BLER does not have to be input to the Target SIR control unit 19 (Target SIR control unit 19 a of this example). In FIG. > TargetBLER) and (measured BLER <TargetBLER) are not used.

  As described above, in the transmission power control method and the transmission power control device of this example, for example, the difference in CRC-NG generation point due to the correction characteristics, which is a defect of the transmission power control method and the transmission power control device in the conventional technology. Data loss due to data transmission can be reduced, and when using a transmission power control method that uses both inner loop transmission power control and outer loop transmission power control, the data series including control data communicated at the same time is more than desired. Data quality can be ensured.

A second embodiment of the present invention will be described.
FIG. 5 shows a configuration example of the Target SIR control unit 19b as a configuration example of the Target SIR control unit 19 shown in FIG. 1, and data decoding units 17-1 and 17-2 and a physical channel BER estimation unit. 18 is shown.
The Target SIR control unit 19b of this example includes a plurality (two shown in this example) of BLER measuring units 71-1 and 71-2 and a plurality (two shown in this example) of Target BLER comparing units 72-. 1, 72-2, a plurality (two shown in this example) of adjustment coefficient control units 73-1, 73-2, an addition unit 74, and a TargetSIR update processing unit 75.

Each BLER measurement unit 71-1, 71-2 performs BLER measurement.
Each BLER comparison unit 72-1, 72-2 compares the given Target BLER with the measured BLER (measured BLER).
Each adjustment coefficient control unit 73-1 and 73-2 outputs a coefficient (adjustment coefficient) for updating TargetSIR.
The adder 74 performs an addition process.
The Target SIR update processing unit 75 performs a target SIR update process.

An example of the operations of the data decoding units 17-1 and 17-2, the physical channel BER estimation unit 18, and the TargetSIR control unit 19b of this example will be shown.
First, the operations of the data decoding units 17-1 and 17-2 and the physical channel BER estimation unit 18 are the same as described with reference to FIG.
Using the decoding result of each data series output from each data decoding unit 17-1, 17-2, BLER measurement is performed by each BLER measurement unit 71-1, 71-2, and the measurement result is obtained for each TargetBLER. It outputs to the comparison parts 72-1 and 72-2. In this example, the determination result of whether the CRC is OK or NG is used for the measurement of BLER, and the measurement of BLER is performed by the ratio of the cumulative number of NG and the cumulative number of measurements in an arbitrary interval. Do.

  Each Target BLER comparison unit 72-1, 72-2 uses, for example, (measurement BLER>) by using the measurement result by each BLER measurement unit 71-1, 71-2 and the target BLER given from the control unit (not shown). When “Target BLER”, the value “+1” is output to each adjustment coefficient control unit 73-1, 73-2, and when “Measurement BLER <Target BLER”, the value “−1” is output to each adjustment coefficient control unit 73-. 1 and output to 73-2.

The operations of the adjustment coefficient control units 73-1 and 73-2, the addition unit 74, and the TargetSIR update processing unit 75 are the same as those described with reference to FIGS. In the control units 73-1 and 73-2, instead of using (CRC-OK) and (CRC-NG), the value of the adjustment coefficient is controlled using (measurement BLER <TargetBLER) and (measurement BLER> TargetBLER). .
Here, (measured BLER <TargetBLER) means that the measured BLER is smaller than the TargetBLER, so that the communication quality is better, and (measured BLER> TargetBLER) means that the measured BLER is better. Since it is larger than TargetBLER, it means that the communication quality is bad.

  In the configuration of this example, it is possible to use the effect of averaging by using BLER in an arbitrary section rather than using the result of CRC-OK or CRC-NG in one block. It is also possible to prevent updating of TargetSIR and excessive control.

  As described above, in this example, the target signal quality (in this example) used for the inner loop transmission power control so that the reception quality of the received data approaches the given target data quality (Target BLER in this example). In the transmission power control method or the transmission power control apparatus that performs outer loop transmission power control for updating TargetSIR), a plurality of data decoding units 17-1 and 17-2 that decode received data for each received data sequence; A physical channel BER estimator 18 for estimating the quality of the physical channel that received the data from radio section control data such as decoding results and pilot bits of the data decoders 17-1 and 17-2; and the data decoding From the decoding results of the sections 17-1 and 17-2, the data quality in an arbitrary time interval of the data series is measured for each data series. BLER measuring units 71-1 and 71-2 that compare the measured data quality with the Target BLER, and output the comparison results, and a plurality of BLER measuring units 71-1 and 72-2 depending on the estimated physical channel quality. The adjustment coefficient control unit 73 determines and outputs an adjustment coefficient for updating the TargetSIR from the comparison result output with the TargetBLER for each of the stages (regions a, b, c, and d). -1, 73-2, an addition unit 74 that adds (synthesizes) adjustment coefficients for each data series, and a TargetSIR update processing unit 75 that updates TargetSIR using the added adjustment coefficient.

  In this example, in the transmission power control method and the transmission power control apparatus as described above, the data encoding units 1-1 and 1-2 that encode transmission data for each data series, and the encoded data A data multiplexing unit 2 that performs time multiplexing, and a radio channel control data such as a pilot bit and a TPC command is inserted into the multiplexed data to generate a transmission data frame, and to a physical channel for transmission in the radio interval A physical channel mapping unit 3 that performs mapping, a modulation unit 4 that performs primary modulation such as QPSK and 16QAM on the mapped physical channel signal, and a spreading unit that performs spreading modulation using a spreading code for each call 5, a path search unit 11 that extracts a received signal path of a call from a baseband received signal using a reference code for each call, and for the extracted path position Despreading section 12 that performs spreading, SIR measuring section 13 that measures the signal quality (SIR in this example) from the received symbol after despreading, and performs synchronous detection and RAKE combining on the received symbol after despreading Power control is provided with a synchronous detection RAKE unit 14, a data determination unit 15 that determines a received signal that has been combined with synchronous detection and RAKE, and a data separation unit 16 that separates the determined data for each radio section control data or data series (In this example, data decoding units 17-1 and 17-2, physical channel BER estimating unit 18 and Target SIR control unit 19b) using the received data after being separated by the power control process ( Here, processing for controlling TPC by updating TargetSIR is performed.

  As described above, in the transmission power control method and the transmission power control device of this example, for example, the difference in CRC-NG generation point due to the correction characteristics, which is a defect of the transmission power control method and the transmission power control device in the conventional technology. Data loss due to data transmission can be reduced, and when using a transmission power control method that uses both inner loop transmission power control and outer loop transmission power control, the data series including control data communicated at the same time is more than desired. Data quality can be ensured.

  In the transmission power control apparatus of this example, the data decoding unit is configured by the functions of the data decoding units 17-1 and 17-2, and the physical channel quality detecting unit is configured by the function of the physical channel BER measurement unit 18. The data quality detecting means is configured by the functions of the BLER measuring units 71-1 and 71-2, and the data quality comparing means is configured by the functions of the TargetBLER comparing units 72-1 and 72-2. The coefficient determination unit is configured by the functions of the adjustment coefficient control units 73-1 and 73-2, the coefficient synthesis unit is configured by the function of the addition unit 74, and the target signal quality is configured by the function of the Target SIR update processing unit 75. Update means are configured.

Here, the configuration of the system and apparatus according to the present invention is not necessarily limited to the configuration described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various systems and devices.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
In addition, as various processes performed in the system and apparatus according to the present invention, for example, the processor executes a control program stored in a ROM (Read Only Memory) in hardware resources including a processor and a memory. A controlled configuration may be used, and for example, each functional unit for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

It is a figure which shows the structural example of the transmission power control apparatus which concerns on one Example of this invention. It is a figure which shows the structural example of the TargetSIR control part which concerns on 1st Example of this invention. It is a figure which shows an example of the relationship between estimated BER and BLER of a data series. It is a figure which shows an example of operation | movement of an adjustment coefficient control part. It is a figure which shows the structural example of the TargetSIR control part which concerns on 2nd Example of this invention. It is a figure which shows the structural example of a transmission power control apparatus. It is a figure which shows an example of operation | movement of a TargetSIR control part.

Explanation of symbols

  1-1, 1-2, 101-1, 101-2, data encoding unit, 2, 102, data multiplexing unit, 3, 103, physical channel mapping unit, 4, 104, modulation unit, 5, 105 ... Spreading unit 11, 111 ... Path search unit 12, 112 ... Despreading unit 13, 113 ... SIR measuring unit 14, 114 ... Synchronous detection RAKE unit 15, 115 ... Data decision unit 16, 116 ... Data separation unit, 17-1, 17-2, 117-1, 117-2 ... Data decoding unit, 18 ... Physical channel BER estimation unit, 19, 19a, 19b, 118... Target SIR control unit 20, 119... Insertion TPC generation unit 41-1, 41-2.. CRC determination unit 42-1, 42-2, 73-1, 73-2. Part, 43, 7 4 .. Addition unit 44, 75 Target SIR update processing unit 71-1, 71-2 BLER measurement unit 72-1, 72-2 Target BLER comparison unit

Claims (1)

In a transmission power control apparatus that performs outer loop transmission power control for updating target signal quality used for inner loop transmission power control so that the data quality of received data approaches the target data quality,
Data decoding means for decoding received data for each data series;
Physical channel quality detection means for detecting the quality of the physical channel from which the data is received based on the predetermined information included in the received data or the decoding result by the data decoding means for the received data;
Data quality detection means for detecting data quality in a predetermined time interval for each data series based on a decoding result by the data decoding means;
Data quality comparison means for comparing the data quality detected by the data quality detection means and the target data quality for each data series;
The physical channel quality and the data quality comparison detected by the physical channel quality detection means based on the correspondence between the physical channel quality and the combination of the comparison result between the detected data quality and the target data quality and the coefficient Coefficient determination means for determining a coefficient corresponding to a combination of comparison results by means for each data series;
Coefficient combining means for combining the coefficients for each data series determined by the coefficient determining means for a plurality of data series;
Target signal quality updating means for updating the target signal quality based on the result of synthesis by the coefficient synthesis means;
A transmission power control apparatus comprising:

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