JP4494445B2 - Transmission power control method and apparatus - Google Patents

Description

  The present invention relates to a transmission power method and apparatus, and more particularly to a transmission power control method and apparatus in a system that wirelessly transmits information (data) between a transmission station and a reception station.

  Conventionally, a transmission power control method disclosed in International Publication WO97 / 50197 is known. This transmission power control method controls transmission power at a transmission station (base station or mobile station) in accordance with so-called double closed loop control in radio communication between a base station and a mobile station in a CDMA mobile communication system. . In this double closed-loop control, the transmitting station sets the desired signal-to-interference plus noise power ratio (hereinafter referred to as SIR: Signal to Interference plus noise power Ratio) measured at the receiving station as the target SIR. The transmission power is controlled (inner loop control). In the process, the quality of the received information (for example, frame error rate (FER), bit error rate (BER), etc.) at the receiving station is measured, and the target information is set so that the quality of the received information becomes the target quality. SIR is controlled (outer loop control).

  According to the method of controlling the transmission power at the transmitting station according to such a double closed loop control method, the transmission power without waste while maintaining the quality of the received information at the receiving station at a desired quality (target quality). Control becomes possible.

  By the way, when information is continuously transmitted and received between the transmitting station and the receiving station, appropriate transmission power control can be performed by the double closed loop control as described above. However, when information is transmitted and received intermittently (burst-like) between the transmitting station and the receiving station (packet transmission / reception, control signal transmission / reception, etc.), there are the following problems.

  For example, as shown in FIG. 18, data transmission / reception between the transmitting station and the receiving station may be stopped at time te, and data transmission / reception may be resumed at time ts after the suspension period. In such a case, the transmission station such as a change in multipath between the transmission station and the reception station due to movement of the transmission station or reception station that becomes the mobile station during the pause period or fading occurs, etc. There is a possibility that the radio wave propagation environment between the receiver and the receiving station will change. As described above, when the radio wave propagation environment changes between the transmitting station and the receiving station during the suspension period, the data reception quality when the data transmission / reception is resumed (time ts) is the same as when the data transmission / reception is stopped. There is a possibility that it is lower than the reception quality of the data at (time te).

  In such a situation, for example, if the value of the target SIR at the time when data transmission / reception is stopped (time te) is maintained until the time when data transmission / reception is resumed (time ts), the value of the target SIR becomes the rest period. In some cases, the value may be lower than the target SIR (see the broken line shown in FIG. 18) that should be originally obtained based on the reception quality of data expected from the radio wave propagation situation between the transmitting station and the receiving station. For this reason, when transmission / reception of data is resumed, it takes time until the target SIR converges to the target SIR value that should be originally obtained by the outer loop control. The reception quality of the data deteriorates during the time until the SIR converges.

  Accordingly, an object of the present invention is to provide a transmission power control method and apparatus using so-called double closed loop control in which transmission of information reception quality is less deteriorated from the start of information transmission / reception when information is transmitted / received intermittently. It is an object to provide a transmission power control method and apparatus that enable power control.

Transmission power control method according to the invention, the receiving station, when you receive the information for each frame from the transmitting station, the transmission power of the transmitting station as the quality of the received signal at the receiving station satisfies the target signal quality In addition to inner loop control, the target signal quality is outer loop controlled for each predetermined number of frames so that the quality of transmission information included in the received signal at the receiving station satisfies the target information quality ,
The receiving station determines whether or not the current period is an idle period in which no information is received, and when it is newly determined that it is an idle period, a predetermined period until it is confirmed that the current period is not an idle period While the number of time intervals that have passed so far is counted each time the time interval of, the target signal quality of the outer loop control target is maintained at the value in the frame immediately before the pause period,
In the frame where the transmission of information is resumed after the pause period , the receiving station adds an increment corresponding to the number of elapsed time intervals to the maintained target signal quality value and resumes the outer loop control. A transmission power control method having a target signal quality setting procedure.

  As described above, according to an aspect of the present invention, when information transmission is resumed, the information is transmitted with a larger transmission power than when information transmission is stopped. Therefore, even if the radio wave propagation environment between the transmitting station and the receiving station changes during the information transmission suspension period, transmission power control with little quality deterioration of transmission information can be performed from the time when transmission of the information is started again. .

  In the power control method according to an aspect of the present invention, when the information transmission is resumed after the information transmission is stopped, the quality of the received signal is larger than the target signal quality value obtained at the time of the stop. The transmission power at the transmitting station is controlled so as to satisfy the signal quality. As a result, when the information transmission is resumed, the information is transmitted with a larger transmission power than when the information transmission is stopped.

  The quality of the received signal is not particularly limited as long as the quality of the received signal when the signal from the transmitting station is received at the receiving station. For example, the level of the received signal, the desired wave versus interference wave, and the noise It can be expressed in terms of power ratio (SIR).

  The transmission information is not particularly limited as long as it is information to be transmitted from the transmission station to the reception station, such as data and control signals. The quality of the transmission information is not particularly limited as long as it represents the degree of difference between the original transmission information and the transmission information obtained at the receiving station. For example, the frame error rate (FER), bit error rate ( BER), an average value thereof, or the presence / absence of an error in an information transmission unit (for example, a frame).

  The target signal quality to be set when the transmission of the information is resumed may be a fixed value such as an upper limit value of the target signal quality control range or a value in the vicinity thereof, depending on various situations. You can also make adjustments.

  In the latter case, for example, in a situation where the degree of change in the radio wave propagation environment between the transmitting station and the receiving station differs depending on the length of the information signal transmission suspension period, transmission power control with less waste becomes possible. From a viewpoint, according to one aspect of the present invention, in the transmission power control method, the target signal quality setting procedure is a target signal to be set when transmission of information is resumed after transmission of the information is stopped. It may be configured to have an adjustment procedure for adjusting the quality value according to the length of the transmission suspension period during which the transmission of the information is stopped.

  Further, according to an aspect of the present invention, in the transmission power control method, the adjustment procedure includes a target signal quality value to be set when transmission of information is resumed after transmission of the information is stopped. The information signal can be adjusted so as to be increased from the value of the target signal quality obtained when the information transmission is stopped by a difference amount corresponding to the length of the transmission suspension period.

From the viewpoint that the adjustment of the target signal quality can be performed without considering the information transmission pause period, according to one aspect of the present invention, in each of the transmission power control methods, the target information is included in the transmission pause period. A pseudo information quality generation procedure for generating pseudo information quality representing quality lower than quality,
The adjustment procedure uses the pseudo information quality generated in the pseudo information quality generation procedure as the quality of transmission information, controls the target signal quality so that the quality satisfies the target information quality, The target signal quality value obtained when transmission is resumed can be configured to be the target signal quality value to be set when information transmission is resumed.

  From the viewpoint that the algorithm for obtaining the quality of transmission information can be used as it is for generating pseudo information quality, and more accurate quality of transmission information can be obtained when information transmission is resumed. According to an aspect, in the transmission power control method, an error of transmission information included in a received signal at a receiving station is measured, and the quality of the transmission information is obtained based on the measured error, and the pseudo information The quality generation procedure generates a pseudo error every predetermined period as an error in the measured transmission information, generates the pseudo information quality based on the error, and the transmission of the information is resumed. Later, it is possible to obtain the quality of the transmission information based on the measured transmission information error without taking into account the pseudo generated error.

  From the viewpoint that appropriate transmission power control is possible while preventing transmission information from becoming excessive quality, according to one aspect of the present invention, transmission of the information is resumed in each of the transmission power control methods. The value of the target signal quality to be set sometimes can be configured to be regulated to be a predetermined value or less.

  From the viewpoint that appropriate transmission power control becomes possible when information is transmitted through a plurality of channels, according to one aspect of the present invention, in each of the transmission power control methods, information is transmitted from a transmission station through a plurality of channels. In the state of intermittent transmission to the receiving station, the target signal quality setting procedure is such that transmission of information on at least one of the plurality of channels is resumed after transmission of information on all channels is stopped. Sometimes it can be configured to set a target signal quality that is larger than the value of the target signal quality obtained at the time of the stop.

  Further, according to one aspect of the present invention, in the transmission power control method, the quality of transmission information of each channel included in a received signal at a receiving station satisfies a target information quality defined by a corresponding channel. The target signal quality can be configured to be controlled.

  Furthermore, according to one aspect of the present invention, when information is wirelessly transmitted between a transmitting station and a receiving station, the transmission power at the transmitting station is set so that the quality of the received signal at the receiving station satisfies the target signal quality. In the transmission power control apparatus for generating the transmission power control signal for controlling the transmission signal and controlling the target signal quality so that the quality of the transmission information included in the reception signal at the receiving station satisfies the target information quality. When the transmission of information is resumed after the transmission of the information is stopped in a state where the transmission is intermittently transmitted from the transmitting station to the receiving station, the target having a value larger than the target signal quality value obtained at the time of the suspension It is comprised so that it may have the target signal quality setting means which sets signal quality.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A radio communication system to which a transmission power control method according to an embodiment of the present invention is applied is configured, for example, as shown in FIG. This wireless communication system is a mobile communication system in which information is transmitted and received between a mobile station and a base station.

  In FIG. 1, a mobile station 100 and a base station 200 transmit and receive signals (packets, control signals, voice signals, etc.) according to, for example, a CDMA system. The mobile station 100 includes a transmission device 110, a reception device 120, a signal processing unit 130, and a user interface 140. The base station 200 includes a transmission device 210, a reception device 220, and a signal processing unit 230.

  Information (sound, document, image, etc.) input from the user by the user interface 140 of the mobile station 100 is processed by the signal processing unit 130 so as to be a signal of a predetermined format. A signal from the signal processing unit 130 is supplied to the transmission device 110 and subjected to predetermined processing such as encoding processing and modulation processing. Then, a signal obtained by the processing is transmitted from the transmission device 110 to the base station 200.

  The receiving device 220 of the base station 200 that has received the signal from the mobile station 100 performs predetermined processing such as demodulation processing and decoding processing on the received signal. Then, the signal generated by the receiving device 120 is converted into a format that can be transmitted on the network by the signal processing unit 230, and the signal is transmitted from the signal processing unit 230 to the terminal of the communication partner via the network.

  In the base station 200, a signal supplied from the network is processed by the signal processing unit 230 so as to be in a predetermined format. The signal from the signal processing unit 230 is supplied to the transmission device 210 and subjected to predetermined processing such as encoding processing and modulation processing. A signal obtained by the processing is transmitted from the transmission device 210 to the mobile station 100.

  The receiving device 120 of the mobile station 100 that has received the signal from the base station 200 performs predetermined processing such as demodulation processing and decoding processing on the received signal. The signal generated by the receiving device 120 is converted into a format that can be processed by the user interface 140 by the signal processing unit 130, and information (voice, document (email)) is transmitted from the user interface 140 to the user based on the signal. , Images, etc.).

  The transmission apparatus 210 of the base station 200 performs transmission power control (downlink transmission power control) based on transmission power control bits (representing power increase and power reduction) transmitted from the mobile station 100. Note that the transmission apparatus 110 of the mobile station 100 can also perform transmission power control (uplink transmission power control) based on the transmission power control bits transmitted from the base station 200. Hereinafter, the downlink transmission power control will be described. To do.

  The transmission apparatus 210 of the base station 200 has a configuration unit as shown in FIG. 2, for example.

  In FIG. 2, this configuration unit includes a wireless transmission unit 211, an error detection encoding unit 212, an error correction encoding unit 213, and a transmission power control unit 214. When data representing information to be transmitted is input from the signal processing unit 230 (see FIG. 1), the error detection encoding unit 212 encodes data according to, for example, a CRC (cycle redundancy check) technique, and detects errors. Are added to each frame and output. The error correction encoding unit 213 encodes data with parity bits in units of frames from the error detection encoding unit 212.

  The wireless transmission unit 211 performs modulation based on the encoded data in units of frames from the error correction encoding unit 213, and transmits a signal obtained by the modulation. The transmission power control unit 214 acquires the transmission power control bit generated in the mobile station 100 from the receiving device 220 as described later, and controls the transmission power in the wireless transmission unit 211 based on the transmission power control bit. . For example, when the transmission power control bit indicates power increase, the transmission power is increased by a predetermined amount (dB). When the transmission power bit indicates power reduction, the transmission power is decreased by a predetermined amount (dB). Let

  The receiving device 120 of the mobile station 100 has a configuration unit as shown in FIG. 3, for example.

  In FIG. 3, this configuration unit includes a radio reception unit 121, an error correction decoding / error detection unit 122, an error rate measurement unit 123, a target SIR determination unit 124, an SIR measurement unit 125, an SIR comparison unit 126, and a transmission power control bit determination. Part 127. Radio receiving section 121 receives a signal transmitted from base station 200 and demodulates the received signal to generate a baseband signal. The baseband signal is supplied to the error correction decoding / error detection unit 122, and error correction decoding is performed on a frame basis, and the presence or absence of an error is detected according to a CRC technique. The decoding result is supplied from the receiving device 120 to the signal processing unit 130 (see FIG. 1) as an information output. The error correction decoding / error detection unit 122 further determines whether there is an error detection result indicating the presence or absence of the error for each frame unit and a pause period (see FIG. 18) in which information (data, signal) is not received. A pause determination signal indicating that is output.

  Based on the error detection result from the error correction decoding / error detection unit 122, the error rate measurement unit 123 receives the frame error rate (FER: Frame Error Rate) from the received signal (desired signal) as the reception quality of the information. Calculate.

  The SIR measurement unit 125 calculates a reception SIR (desired wave-to-interference wave and noise power ratio) based on the reception signal obtained by the wireless reception unit 121. This calculation cycle is shorter than the data frame cycle. The target SIR determination unit 124 determines the target SIR so that the reception quality (FER) of the information output from the error rate measurement unit 123 becomes the target quality according to the procedure described later. The SIR comparison unit 126 compares the received SIR from the SIR measurement unit 125 with the target SIR from the target SIR determination unit 124 and outputs the comparison result.

  The transmission power control bit determination unit 127 determines the value of the transmission power control bit based on the comparison result from the SIR comparison unit 126. When the reception SIR is smaller than the target SIR, the transmission power control bit is determined to be a value (for example, “1”) to increase the transmission power, assuming that the reception level of the desired wave is low. On the other hand, when the reception SIR is larger than the target SIR, the transmission power control bit is determined to be a value (for example, “0”) for reducing the transmission power, assuming that the reception level of the desired wave is high. The transmission power control bits whose values are determined in this way are supplied from the transmission power control bit determination unit 127 to the transmission device 110 and transmitted from the transmission device 110 to the base station 200. Then, as described above, the transmission power control is performed in the transmission device 210 of the base station 200 based on the transmission power control bit.

  The error rate measuring unit 123 calculates FER according to the procedure shown in FIG. 4, for example.

  In FIG. 4, the error rate measurement unit 123 determines whether or not the current time is a pause period based on the pause determination signal (S1), and if it is not the pause period, an error from the error correction decoding / error detection unit 122 is detected. The detection result input wait state is set (NO in S2). In this state, when an error detection result output from the error correction decoding / error detection unit 122 is input for each frame (YES in S2), whether or not the error detection result indicates that there is an error (CRC = NG). Is determined (S3). If the error detection result indicates that there is an error (YES in S3), the error frame counter is incremented by +1 (S4) and the received frame counter is incremented by +1 (S5). On the other hand, if the error detection result indicates no error (CRC = OK) (NO in S3), the error frame counter is not incremented, and the received frame counter is incremented by +1 (S5). ).

  Thereafter, it is determined whether or not the number of received frames has reached a predetermined number (S6). When the number of received frames has not reached the predetermined number (NO in S6), the above-described processing (S1 to S6) is executed along with determination of whether or not communication is in progress (S8). In this manner, in a state where data is transmitted and received between the base station 200 and the mobile station 100 (a state other than the idle period), the error is detected every time an error detection result is input (YES in S2). If the detection result indicates that there is an error (YES in S3), the counter for the number of error frames and the counter for the number of received frames are incremented (S4, S5), and if the error detection result indicates that there is no error (in S3) NO), only the counter of the number of received frames is counted up (S5).

  When the number of received frames reaches a predetermined number in the process of repeatedly executing the above processing (S1 to S6, S8) (YES in S6), the number of received frames and the number of error frames obtained at that time are calculated. FER (= number of error frames / number of received frames) is calculated, and the FER is output from the error rate measurement unit 123 (S7). At this time, the counter for the number of erroneous frames and the counter for the number of received frames are reset. Thereafter, while the base station 200 is transmitting data to the mobile station 100 (NO in S1), the above-described processing is repeatedly executed. As a result, the error rate measurement unit 123 outputs FER as the reception quality of information restored from the received signal (desired wave) every time the number of frames received by the receiving device 120 reaches a predetermined number.

The predetermined number is determined according to the target quality. For example, if the target quality (target FER) is 10 ⁻² , the quality is such that the number of error frames is 1 with respect to the number of received frames 100, and therefore the predetermined number is set to 100 or more.

  In the process described above, when a pause determination signal indicating that the current time is a pause period (a period in which there is no substantial data to be transmitted / received) is input from the error correction decoding / error detection unit 122 (YES in S1). The counters of the error frame counter and the reception frame counter are reset (S9). This is to prevent the FER from being calculated based on the count value remaining in each counter when the data transmission from the base station 200 is stopped and the data transmission is resumed after the pause period. It is. Thereby, even if the radio wave propagation environment changes during the suspension period, it is possible to obtain the reception quality (FER) of information based on the radio wave propagation environment when data transmission is resumed.

  Note that the processing in the error rate measurement unit 123 ends when communication between the base station 200 and the mobile station 100 ends (NO in S8).

  The target SIR determination unit 124 determines the target SIR, for example, according to the procedure shown in FIG.

  In FIG. 5, the target SIR determination unit 124 resets the pause flag (= 0) (S11), and sets the target SIR (SIRt) to an initial value (S12). Thereafter, the target SIR determination unit 124 determines whether or not the current time is a suspension period based on the suspension determination signal (S13). If not, the suspension flag is set (= 1). It is determined whether or not (S14). When the pause flag is reset (= 0) in a situation where data is transmitted from the base station 200 to the mobile station 100 (NO in S13), the target SIR determination unit 124, as described above, the error rate measurement unit 123. To wait for input of FER output every predetermined number of received frames (NO in S15).

  In this state, when the FER from the error rate measuring unit 123 is input, the input FER and the target error rate FERt (corresponding to the target quality) are compared (S16). Then, based on the comparison result, it is determined whether or not the input FER is within the range of ± α of the target error rate FERt (S17). When the input FER is within ± α of the target error rate FERt (YES in S17), the currently set target SIR (SIRt) is maintained (SIRt = SIRt) (S18). On the other hand, if the input FER is not within the range of ± α of the target error rate FERt (NO in S17), it is further determined whether or not the input FER exceeds an allowable upper limit (FERt + α) of the target error rate ( S19).

  If the input FER exceeds the allowable upper limit (FERt + α) of the target error rate (YES in S19), the target SIR (SIRt) is only Δ1 because the quality of the information represented by the received signal has not reached the target quality. Increased (SIRt = SIRt + Δ1) (S20). On the other hand, when the input FER does not exceed the allowable upper limit (FERt + α) of the target error rate (NO in S19), it is further determined whether or not the input FER is below the allowable lower limit of the target error rate (FERt−α). (S21). If the input FER is below the allowable lower limit (FERt−α) of the target error rate (YES in S21), the target SIR (SIRt) is determined that the quality of the information represented by the received signal has reached the target quality. It is decreased by Δ2 (SIRt = SIRt−Δ2) (S22).

  The determination that the input FER does not fall below the allowable lower limit (FERt−α) of the target error rate (NO in S21) is inconsistent with the previous determination (NO in S17, NO in S19), and is currently set. The target SIR (SIRt) is maintained (SIRt = SIRt) (S18).

  As described above, every time FER is input from the error rate measurement unit 123, the target SIR (SIRt) is determined based on the relative relationship between the input FER and the target error rate FERt. As a result, for example, as shown in FIG. 6, if the quality of the obtained information is lower than the target quality during the period in which data is transmitted from the base station 200 to the mobile station 100 (period other than the pause period) (input FER When the value exceeds the allowable upper limit of the target error rate), the target SIR (SIRt) is increased by Δ1. On the other hand, if the quality of the obtained information is higher than the target quality (when the input FER is below the allowable lower limit of the target error rate), the target SIR (SIRt) is decreased by Δ2. If the quality of the obtained information becomes the target quality (when the input FER is within the range of ± α of the target error rate), the target SIR (SIRt) is maintained.

  Then, the value of the transmission power control bit is determined so that the reception SIR approaches the target SIR controlled as described above (outer loop control) (inner loop control). As a result, the transmission power at the transmission apparatus of the base station is controlled without waste so that the quality of the received information becomes the target quality.

  The unit Δ1 for increasing the target SIR and the unit Δ2 for decreasing the target SIR may be the same or different. Setting the unit Δ1 to be increased to be larger than the unit Δ2 to decrease is because when the reception quality of information is lower than the target quality, transmission power control is performed so that the reception quality can be converged to the target quality sooner. ,preferable.

  When the transmission of data from the base station 200 is stopped and the pause period is started in the course of the processing in the target SIR determination unit 124 as described above, the target SIR determination unit 124 determines the current time based on the pause determination signal. Is a pause period (YES in S13). Then, it is determined whether or not the pause flag is set (= 1) (S24). If the pause flag is not set (NO in S24), the pause flag is set (= 1) (S25). Thereafter, confirmation that the pause flag is set is repeatedly executed (S13, S24).

  In this state, when transmission of data from base station 200 is resumed, target SIR determination unit 124 determines that the current time is not the suspension period based on the suspension determination signal (NO in S13). Then, it is determined whether or not the pause flag is set (S14). At the start of data transmission after the pause period (time ts1, ts2 shown in FIG. 6), the state of the pause flag set at the start of the pause period (time te1, te2 shown in FIG. 6) is maintained. Therefore, it is determined that the pause flag is set (YES in S14). Then, a predetermined value SIRto is set as the target SIR (SIRt) (SIRt = SIRto) (S26). Thereafter, the pause flag is reset (= 0) (S27). Thereafter, processing similar to the processing (S13 to S22) when data is transmitted from the base station 200 as described above is repeatedly executed, and the target is determined based on the relative relationship between the input FER and the target error rate FERt. SIR is determined.

  As described above, the value SIRto of the target SIR set when data transmission is resumed after the pause period is determined to be the upper limit value of the control range of the target SIR (SIRt) or a value in the vicinity thereof. As a result, as shown in FIG. 6, even if the radio wave propagation environment between the mobile station 100 and the base station 200 changes during the suspension period in a predetermined period from the time ts1 and ts2 when the data transmission is resumed, the reception SIR is Since transmission power control is performed so as to approach the relatively high target SIR value SIRto, the quality (error rate) of information acquired by the mobile station 100 can be maintained relatively high (small).

  Note that the value of the target SIR set when the data transmission is resumed after the pause period is not limited to the upper limit value of the control range of the target SIR or a value in the vicinity thereof as described above. For example, a value obtained by adding a predetermined amount to the target SIR value set at the start of the pause period (te1, te2) can be set at the time of resuming data transmission after the pause period (ts1, ts2). In this case, even when the set target SIR value is lower than the appropriate target SIR expected from the radio wave propagation environment between the base station 200 and the mobile station 100, the suspension period starts as in the conventional method. Compared to the case where the control is resumed from the target SIR that is sometimes obtained, the target SIR can be converged earlier by the appropriate target SIR according to the above-described procedure (S13 to S22).

  The above-described processing for setting the target SIR (S13 to S27) is repeatedly executed in a state where communication between the mobile station 100 and the base station 200 is continued (YES in S23) depending on the situation. Is done. The process ends when communication between the mobile station 100 and the base station 200 is ended (NO in S23).

  For example, the target SIR determination unit 124 can perform processing according to the procedure shown in FIG. In this case, the value of the target SIR set at the start of data transmission after the pause period is controlled according to the length of the pause period. In FIG. 7, processing steps similar to those shown in FIG. 5 are given the same reference numerals.

  In FIG. 7, the count value N is set to the initial value zero (N = 0) (S31), and the target SIR (SIRt) is set to the initial value (S12). Thereafter, the target SIR determination unit 124 determines whether or not the current time is a pause period based on the pause determination signal (S13). If not, the target value SIR determination unit 124 further determines whether or not the count value N is zero. Is determined (S14). In the situation where data is transmitted from the base station 200 to the mobile station 100, when the count value N is zero (NO in S13), the target SIR determination unit 124 is similar to the above-described example (see FIG. 5). Each time FER is input from the error rate measurement unit 123, the target SIR value is set based on the relative relationship between the input FER and the target error rate FERt (S15 to S22).

  When the transmission of data from the base station 200 is stopped in the course of the processing in the target SIR determination unit 124 as described above, and the pause period is started, the target SIR determination unit 124 is based on the pause determination signal. It is determined that the current time is a suspension period (YES in S13). Then, a timer process for measuring a predetermined time is performed (S33), and the count value N is incremented by +1 (S34). Thereafter, the timer process (S33) and the increment of the count value N (S34) are repeatedly executed along with the confirmation of the suspension period (NO in S13). As a result, the count value N is sequentially incremented every time measured by the timer process.

  In this state, when transmission of data from base station 200 is resumed, target SIR determination unit 124 determines that the current time is not the suspension period based on the suspension determination signal (NO in S13). Then, it is determined whether or not the count value N is zero (S32). In the pause period, the count value N is sequentially incremented. At the end of the pause period, the count value N is a value corresponding to the length of the pause period. Therefore, it is determined that the count value N is not zero (NO in S32).

  Then, referring to a table showing the relationship between the count value N and the difference value Δ (N), the current value of the target SIR (SIRt) set at the start of the pause period and maintained during the pause period is A new target SIR is set by adding the difference value Δ (N) corresponding to the count value N at (SIRt = SIRt + Δ (N)) (S35). Then, the count value N is reset (S36). Thereafter, the same processing (S15 to S22) as the processing when data is transmitted from the base station 200 as described above is repeatedly executed, and the target is determined based on the relative relationship between the input FER and the target error rate FERt. SIR is determined.

  The relationship between the above and the count value N and the difference value Δ (N) is, for example, as shown in FIG. That is, as the count value N increases, the difference value Δ (N) increases stepwise. As a result, as shown in FIG. 9, the difference value Δ (N2) between the value of the target SIR set at the start time te2 of the pause period TN2 and the target SIR set at the data transmission restart time ts2 after the pause period TN2. ) Is a difference value Δ () between the value of the target SIR set at the start time te1 of the pause period TN1 shorter than the pause period TN2 and the value of the target SIR set at the time ts1 of data transmission restart after the pause period TN1. N1).

  Therefore, a relatively large target SIR is set at a data transmission restart time ts2 after a relatively long pause period TN2 where a change in the radio wave propagation environment is expected to be relatively large, and a predetermined time from the data transmission restart time ts2 is set. The transmission power control is performed so that the reception SIR approaches the target SIR having a relatively large value. Therefore, the quality (error rate) of information acquired by the mobile station 100 can be maintained relatively high (small).

  On the other hand, at the data transmission restart time ts1 after a relatively short pause period TN1 in which the change of the radio wave propagation environment is expected to be relatively small, the increment of the set target SIR value becomes relatively small, and the target SIR value Is prevented from being set higher than necessary. Therefore, transmission power control is performed while suppressing the quality (error rate) of information acquired by the mobile station 100 from being excessive.

  The error rate measuring unit 123 can also perform processing according to the procedure shown in FIG. 10, for example. In this case, a pseudo FER is generated during the pause period. As a result, the target SIR determination unit 124 can set a relatively large target SIR at the time of resuming data transmission after the pause period without the pause period being recognized by the pseudo FER. Become. In FIG. 10, the same reference numerals are assigned to the same processing steps as those shown in FIG.

  In FIG. 10, the error rate measuring unit 123 sets the count value N to the initial value zero and sets the constant value M (S41). Then, the error rate measurement unit 123 monitors whether or not the frame reception processing (decoding processing and error detection processing for the received frame) in the error correction decoding / error detection unit 122 is completed (S42). If it is determined that the frame reception process in the error correction decoding / error detection unit 122 has been completed (YES in S42), the presence / absence of received data is determined based on the pause determination signal (S43). When there is received data (when it is not a pause period) (YES in S43), the error measurement unit 123 acquires the error detection result from the error correction decoding / error detection unit 122 (S44).

  Thereafter, as in the above-described example (see FIG. 4), when the obtained error detection result indicates that there is an error (YES in S3), the error frame number counter and the reception frame number counter are counted up ( S4, S5) When the error detection result indicates no error (NO in S3), only the counter of the number of error frames is counted up (S5). The count value N is reset (N = 0) before the reception frame count is counted up (S45).

  In a state where transmission of data from the base station 200 to the mobile station 100 is continued (YES in S43), the error rate measurement unit 123 acquires an error detection result every time the completion of the frame reception process is confirmed. Based on the detection result, the control of counting up the counter of the number of erroneous frames and the control of counting up the counter of the number of received frames are repeatedly executed together with the reset of the count value N (S42, S43, S44, S3, S4, S45). , S5). When the number of received frames reaches a predetermined value (YES in S6), FER (frame error rate) is calculated based on the number of received frames and the number of error frames, as in the above-described example (see FIG. 4). FER is output (S7). Then, each counter is reset.

  In a state where data transmission from the base station 200 to the mobile station 100 is performed by the processing according to the above-described procedure, the error rate measurement unit 123 determines the FER as the target SIR every time the number of received frames reaches a predetermined number. To the unit 124.

  If it is determined in the process described above that there is no received data based on the pause determination signal (current time is the pause period) (NO in S43), the count value N is incremented by +1 (S46). ), It is determined whether or not the count value N has reached the constant value M (S47). The constant value M is smaller than the predetermined value used in the determination step S6. If the count value N has not reached the constant value M (NO in S47), the reception frame number counter is incremented (S5). Thereafter, in the pause period (NO in S43), every time the end of the frame reception process is confirmed (YES in S42), the count value N is incremented (S46), and whether the count value N has reached the constant value M or not. Confirmation (S47), counting up the counter of the number of received frames (S5), and determining whether or not the number of received frames has reached a predetermined number (S6).

  In the process, when the count value N reaches the constant value M (YES in S47), the error frame counter is counted up (S4) and the count value N is reset (N = 0) (S45). Done. By such processing, every time the received frame reaches M, the error frame counter is counted up. When the received frame reaches a predetermined value (YES in S6), FER is calculated based on the number of received frames and the number of error frames obtained at that time (S7).

  By repeatedly executing the above-described processing (S42, S43, S46, S47, S4, S45, S5, S6, S7) during the pause period, the error rate measurement unit 123 performs the process for M received frames during the pause period. A pseudo FER corresponding to the ratio of one error frame is output.

  Note that the constant value M is set so that the pseudo FER is larger than FERt + α than the allowable upper limit of the target error rate used when determining the target SIR.

  As described above, FER based on the actual number of error frames output from the error rate measurement unit 123 while data transmission from the base station 200 to the mobile station 100 is performed, and the error rate measurement unit 123 during the idle period. For example, the target SIR determination unit 124 that inputs the pseudo FER output from FIG. 11 performs processing according to the procedure shown in FIG. In FIG. 11, the same reference numerals are assigned to the same processing steps as those shown in FIG.

  Similar to the above-described example (see FIG. 5), after the initial value of the target SIR (SIRt) is set (S12), every time FER is input from the error rate measuring unit 123, the input FER and the target error rate A target SIR (SIRt) is determined based on a relative relationship with FERt (S15 to S22).

  In such a process, when the idle period is reached, the error rate measurement unit 123 outputs a pseudo FER as described above. The target SIR determination unit 124 performs processing according to the same procedure as described above using the pseudo FER as an input FER. In this case, the pseudo FER is set to a value exceeding the allowable upper limit (FIRt + α) of the target error rate by appropriately determining the constant value M (see S41 in FIG. 10). Therefore, every time the pseudo FER is acquired as the input FER in the above process, the target SIR (SIRt) increases by Δ1 based on the relative relationship between the input FER and the target error rate FERt. (S15, S16, S17, S19, S20).

  As shown in FIG. 12, when the target SIR increases by Δ1 in the pause period by the above process, the target SIR at the start of the pause period is similar to the example described above (see FIGS. 7, 8, and 9). The difference between the value and the value of the target SIR when data transmission is resumed after the pause period increases as the pause time increases. Therefore, similarly to the above-described example, when data transmission is resumed after a relatively long pause period in which the change in the radio wave propagation environment is expected to be relatively large, a relatively large target SIR is set, and the data transmission is resumed. Transmission power control is performed so that the reception SIR approaches the relatively large target SIR for a predetermined time from the time. On the other hand, when the data transmission is resumed after a relatively short pause period in which the change in the radio wave propagation environment is expected to be small, the increase in the set target SIR value is relatively small, and the target SIR value is more than necessary. High setting is prevented.

  In this example (FIGS. 10, 11, and 12), the target SIR determination unit 124 can perform the process without recognizing the suspension period, and the process becomes easy.

  When calculating the FER according to the procedure shown in FIG. 10, as shown in FIG. 13, the FER is calculated based on the number of error frames obtained in the quality measurement period (period until the received frame reaches a predetermined value), The FER is reflected in the target SIR after the quality measurement period. For this reason, when data transmission is resumed in the middle of the quality measurement period, immediately after the data transmission resume time ts, the number of erroneously counted error frames is added to the calculation of the error rate of the actual received data. End up. For this reason, the accuracy of the FER obtained immediately after the data transmission restart time ts after the pause period is lowered.

  In order to solve such a problem and always accurately calculate the error rate (FER) of the actual received data from the time ts when data transmission is resumed after the pause period, the error rate measurement unit 123, for example, Processing can be performed according to the procedure shown in FIG. In FIG. 14, the same reference numerals are assigned to the same processing steps as the processing steps shown in FIG.

  In FIG. 14, after determining the end of the frame reception process (YES in S42), if it is determined that there is no received data (pause period) based on the pause determination signal, whether or not the pause flag is set. Is determined (S49). If the pause flag is not set (NO in S49), the pause flag is set (S50).

  Thereafter, in the pause period, while it is confirmed that the pause flag is set (S49), the error occurs at the rate of one error frame in M received frames, as in the above example (see FIG. 10). The frame number counter is incremented (S46, S47, S4, S45, S5). Then, every time the number of received frames reaches a predetermined value, a pseudo FER is calculated and output (S6).

  If it is determined in the course of the above processing that the pause period has ended and there is received data (YES in S43), it is determined whether or not the pause flag is set (S48). When resuming data transmission after the pause period, since the pause flag state set at the start of the pause period is maintained (S50), it is determined that the pause flag is set (YES in S48). Then, the counter for the number of erroneous frames and the counter for the number of received frames are reset (S51), and the pause flag is reset (S52).

  Thereafter, similar to the above-described example, every time an error detection result is acquired from the error correction decoding / error detection unit 122 (S44), if the error detection result indicates that there is an error (YES in S3), an error is detected. The frame counter and the reception frame counter are counted up (S4, S5). If the error detection result indicates no error, only the reception frame counter is counted up (S5). When the number of received frames reaches a predetermined value (YES in S6), FER is calculated and output based on the number of error frames and the number of received frames at that time (S7).

  According to the above processing, when data transmission is resumed after the pause period, the error frame counter and the reception frame counter are reset. FER which reflects can be obtained.

  Next, an example where there are a plurality of transmission channels will be described.

  The receiving apparatus 120 includes a configuration unit as illustrated in FIG. 15, for example.

  In FIG. 15, a signal obtained by multiplexing channel 1 (for example, data channel) and channel 2 (for example, control channel) from the wireless receiver 121 is separated into a channel 1 signal and a channel 2 signal by a separation circuit 128. Is done. Similarly to the example shown in FIG. 3, error correction decoding / error detection units 122a and 122b and error rate measurement units 123a and 123b are provided for each channel. The target SIR determination unit 124 is supplied with the channel 1 quality information FER from the error measurement unit 123a and the channel 2 quality information FER from the error rate measurement unit 123b. Then, the target SIR determines the target SIR based on the reception quality information of each channel and the target quality information of each channel.

  Similarly to the example described above, the SIR comparison unit 126 compares the received SIR obtained by the SIR measurement unit 125 and the target SIR determined by the target SIR determination unit 124. Based on the comparison result, the transmission power control bit determination unit 127 determines the value of the transmission power control bit.

  Moreover, the transmission apparatus 210 has a structure part as shown in FIG. 16, for example.

  In FIG. 16, each of channel 1 and channel 2 has error detection encoding units 212a and 212b and error correction encoding units 213a and 213b, as in the example shown in FIG. Data from each of the error correction encoding units 213 a and 213 b is multiplexed by the multiplexing circuit 215, and the multiplexed data is supplied to the wireless transmission unit 211. The wireless transmission unit 211 performs modulation based on the supplied data and transmits a signal obtained by the modulation. Then, the transmission power control unit 214 controls the transmission power of the wireless transmission unit 211 based on the transmission power control bit.

When there are two transmission channels as described above, for example, as shown in FIG. 17, data (or control signal) is intermittently transmitted in each channel. In this situation,
(1) A state in which data is transmitted on both channels
(Before te21, ts11-te22),
(2) A state where data is transmitted only on channel 1
(Te21-te11, te22-te12),
(3) Data is not transmitted on either channel
(Te11-ts21, te12-ts22),
(3) A state where data is transmitted only on channel 2
(Ts21 to ts11, ts22 to ts12)
Can exist.

  In the state (1), the target SIR determination unit 124 sets the target SIR for channel 1 based on the relative relationship between the reception quality information (FER) from the error rate measurement unit 123a and the target quality for channel 1. (1) is determined (see the procedure shown in FIG. 11), and the target SIR in channel 2 is determined based on the relative relationship between the reception quality information (FER) from error rate measurement unit 123b and the target quality in channel 2. (2) is determined (see the procedure shown in FIG. 11). Then, a target SIR having a larger value among the target SIR (1) and the target SIR (2) in each channel is determined as the final target SIR.

  In the states (2) and (4) above, the relative relationship between the reception quality information (FER) from the error rate measurement unit 123a or 123b corresponding to the channel through which the data is transmitted and the target quality in that channel. A target SIR is determined based on the relationship (see the procedure shown in FIG. 11).

  Further, the target SIR value SIRtx that is set when data transmission is resumed in at least one of the channels from the state (3) (pause period) in which neither channel is transmitting data is the target SIR. Even if it is set to the upper limit value of the control range or the value SIRto in the vicinity thereof (see FIG. 5, FIG. 5), the value increased by the difference value corresponding to the length of the pause period (FIG. 7, FIG. 8, FIG. (See FIGS. 10, 11, and 12).

  In each of the above examples, the target SIR value set when resuming data transmission after the pause period is controlled so as not to exceed a predetermined upper limit value, thereby preventing the target SIR from becoming higher than necessary. Is done. When a target SIR higher than necessary is set, it takes time to converge to the original appropriate target SIR after data transmission is resumed, and the communication state with excessive quality will continue for a long time. In the case of a CDMA mobile communication system, if a state of excessive quality continues in each user channel for a long time, useless transmission power is consumed on the transmission side, resulting in a reduction in system capacity. By limiting the target SIR value that is set when data transmission is resumed as described above, such wasteful transmission power consumption can be suppressed as low as possible.

  In each of the above examples, a moving average value of FER obtained in a predetermined cycle can be used as the quality information of data.

  Furthermore, the target SIR determination unit 124 does not determine the target SIR based on the FER from the error rate measurement unit 123 but determines the target SIR based on the error detection result from the error correction decoding / error detection unit 122. You can also For example, if the error detection result for each frame or for each of a plurality of frames indicates that there is an error, the target SIR is increased by a predetermined amount (for example, 1 dB), and the error detection result frames indicating no error are consecutive. The target SIR is decreased by a predetermined amount (for example, 0.5 dB) at a constant period (every predetermined number of frames).

  In each of the above examples, the base station 200 corresponds to a transmitting station, and the mobile station 100 corresponds to a receiving station. Further, the processing in step S26, the processing in step S35, and the processing in step S20 based on the processing shown in FIG. 10 correspond to the target signal quality setting procedure (means).

  Hereinafter, the means taught by the present invention will be listed as an example.

(Appendix 1)
When wirelessly transmitting information between the transmitting station and the receiving station, the transmission power at the transmitting station is controlled so that the quality of the received signal at the receiving station satisfies the target signal quality, and the received signal at the receiving station In the transmission power control method for controlling the target signal quality so that the quality of transmission information included in the target information quality satisfies the target information quality,
In the state where information is intermittently transmitted from the transmitting station to the receiving station, when the transmission of information is resumed after the transmission of the information is suspended, a value larger than the target signal quality value obtained at the time of the suspension A transmission power control method including a target signal quality setting procedure for setting a target signal quality.

(Appendix 2)
In the transmission power control method according to attachment 1,
The target signal quality setting procedure includes a target signal quality value to be set when transmission of information is resumed after transmission of the information is stopped, and a length of a transmission pause period during which transmission of the information is stopped. The transmission power control method which has the adjustment procedure adjusted according to.

(Appendix 3)
In the transmission power control method according to attachment 2,
In the adjustment procedure, the target signal quality value to be set when the transmission of information is resumed after the transmission of the information is stopped is determined based on the target signal quality value obtained when the transmission of the information is stopped. A transmission power control method for adjusting to a value that is increased by a difference amount according to the length of a pause period.

(Appendix 4)
In the transmission power control method according to attachment 2 or 3,
A pseudo information quality generation procedure for generating pseudo information quality representing quality lower than the target information quality during the transmission suspension period;
The adjustment procedure uses the pseudo information quality generated in the pseudo information quality generation procedure as the quality of transmission information, controls the target signal quality so that the quality satisfies the target information quality,
A transmission power control method in which a target signal quality value obtained when information transmission is resumed is a target signal quality value to be set when information transmission is resumed.

(Appendix 5)
In the transmission power control method according to attachment 4,
Measure the error of the transmission information included in the received signal at the receiving station, so as to determine the quality of the transmission information based on the measured error,
The pseudo information quality generation procedure generates a pseudo error every predetermined period as an error of the measured transmission information, generates the pseudo information quality based on the error,
A transmission power control method for obtaining the quality of the transmission information based on the measured transmission information error without taking into account the pseudo-generated error after the transmission of the information is resumed.

(Appendix 6)
In the transmission power control method according to any one of appendices 1 to 5,
A transmission power control method in which a target signal quality value to be set when transmission of the information is resumed is regulated to be a predetermined value or less.

(Appendix 7)
In the transmission power control method according to any one of appendices 1 to 6,
In a state where information is intermittently transmitted from a transmitting station to a receiving station through a plurality of channels, the target signal quality setting procedure includes at least one of the plurality of channels after transmission of information of all channels is stopped. A transmission power control method in which, when transmission of information of one channel is resumed, a target signal quality larger than the target signal quality obtained at the time of stopping is set.

(Appendix 8)
In the transmission power control method according to appendix 7,
A transmission power control method for controlling the target signal quality so that the quality of transmission information of each channel included in the received signal at the receiving station satisfies the target information quality defined by the corresponding channel.

(Appendix 9)
When wirelessly transmitting information between a transmitting station and a receiving station, a transmission power control signal is generated to control the transmission power at the transmitting station so that the received signal quality at the receiving station satisfies the target signal quality. In addition, in the transmission power control apparatus for controlling the target signal quality so that the quality of transmission information included in the received signal at the receiving station satisfies the target information quality,
In the state where information is intermittently transmitted from the transmitting station to the receiving station, when the transmission of information is resumed after the transmission of the information is suspended, a value larger than the target signal quality value obtained at the time of the suspension A transmission power control apparatus having target signal quality setting means for setting target signal quality.

(Appendix 10)
In the transmission power control device according to attachment 9,
The target signal quality setting means sets a target signal quality value to be set when transmission of information is resumed after transmission of the information is stopped, and a length of a transmission pause period during which transmission of the information is stopped. A transmission power control apparatus having adjustment means for adjusting according to the frequency.

(Appendix 11)
In the transmission power control apparatus according to attachment 10,
The adjustment means determines that the target signal quality value to be set when the transmission of information is resumed after the transmission of the information is stopped is determined based on the target signal quality value obtained when the transmission of the information is stopped. A transmission power control apparatus that adjusts to a value that is increased by a difference amount according to the length of a pause period.

(Appendix 12)
In the transmission power control apparatus according to appendix 10 or 11,
A pseudo information quality generating means for generating pseudo information quality representing quality lower than the target information quality in the transmission suspension period;
The adjusting means controls the target signal quality so that the quality satisfies the target information quality, with the pseudo information quality generated by the pseudo information quality generating means as the quality of transmission information,
A transmission power control apparatus that uses a target signal quality value obtained when information transmission is resumed as a target signal quality value to be set when information transmission is resumed.

(Appendix 13)
In the transmission power control apparatus according to attachment 12,
Measure the error of the transmission information included in the received signal at the receiving station, so as to determine the quality of the transmission information based on the measured error,
The pseudo information quality generation means generates a pseudo error every predetermined period as an error of the measured transmission information, generates the pseudo information quality based on the error,
After the transmission of the information is resumed, pseudo error canceling means for obtaining the quality of the transmission information based on the measured transmission information error without taking the pseudo generated error into account. A transmission power control apparatus.

(Appendix 14)
In the transmission power control apparatus according to any one of appendices 9 to 13,
The target power setting unit is a transmission power control device configured to regulate a target signal quality value to be set when a transmission of the information is resumed to be a predetermined value or less.

(Appendix 15)
In the transmission power control apparatus according to any one of appendices 9 to 14,
In a state in which information is intermittently transmitted from the transmitting station to the receiving station on a plurality of channels, the target signal quality setting means is configured to stop at least one of the plurality of channels after transmission of information on all channels is stopped. A transmission power control apparatus configured to set a target signal quality larger than a target signal quality value obtained when the transmission of information on one channel is resumed.

(Appendix 16)
In the transmission power control apparatus according to attachment 15,
Transmission power control apparatus having target signal quality control means for controlling the target signal quality so that the quality of transmission information of each channel included in the received signal at the receiving station satisfies the target information quality determined by the corresponding channel .

It is a block diagram which shows an example of the radio | wireless communications system to which the transmission power control method which concerns on one Embodiment of this invention is applied. It is a block diagram which shows an example of the structure part which concerns on the transmission power control which a transmitter has. It is a block diagram which shows an example of the structure part which concerns on the transmission power control which a receiver has. It is a flowchart which shows the 1st example of the process sequence in an error rate measurement part. It is a flowchart which shows the 1st example of the process sequence in a target SIR determination part. It is a figure which shows the 1st example of the relationship between the transmission state of data, and target SIR. It is a flowchart which shows the 2nd example of the process sequence in a target SIR determination part. It is a figure which shows an example of the relationship between count value N and difference value (DELTA) (N) of target SIR. It is a figure which shows the 2nd example of the relationship between the transmission state of data, and target SIR. It is a flowchart which shows the 2nd example of the process sequence in an error rate measurement part. It is a flowchart which shows the 3rd example of the process sequence in a target SIR determination part. It is a figure which shows the 3rd example of the relationship between the transmission state of data, and target SIR. It is a figure which shows an example of the relationship between a quality measurement period and the target SIR in which the quality information obtained in the period is reflected. It is a flowchart which shows the 3rd example of the process sequence in an error rate measurement part. It is a block diagram which shows an example of the structure part which concerns on the transmission power control which considered the multiple channel which a receiver has. It is a block diagram which shows an example of the structure part which concerns on the transmission power control which considered the multiple channel which a transmitter has. It is a figure which shows an example of the relationship between the transmission state of the data in multiple channels, and target SIR. It is a figure which shows an example of the relationship between the data transmission state in the conventional transmission power control, and target SIR.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Mobile station 110 Transmitting device 120 Receiving device 121 Radio receiving unit 122 Error correction decoding / error detecting unit 123 Error rate measuring unit 124 Target SIR determining unit 125 SIR measuring unit 126 SIR comparing unit 127 Transmission power control bit determining unit 130 Signal processing unit 140 User interface 200 Base station 210 Transmitting device 211 Wireless transmission unit 212 Error detection coding unit 213 Error correction coding unit 214 Transmission power control unit

Claims (12)

Receiving station, when you receive the information for each frame from the transmitting station, the transmission power of the transmitting station as the quality of the received signal at the receiving station to satisfy the target signal quality as well as the inner loop control, the receiving station Outer loop control of the target signal quality for each predetermined number of frames so that the quality of the transmission information included in the received signal satisfies the target information quality ,
The receiving station determines whether or not the current period is an idle period in which no information is received, and when it is newly determined that it is an idle period, a predetermined period until it is confirmed that the current period is not an idle period While the number of time intervals that have passed so far is counted each time the time interval of, the target signal quality of the outer loop control target is maintained at the value in the frame immediately before the pause period,
In the frame where the transmission of information is resumed after the pause period , the receiving station adds an increment corresponding to the number of elapsed time intervals to the maintained target signal quality value and resumes the outer loop control. A transmission power control method having a target signal quality setting procedure to be performed. The transmission power control method according to claim 1 ,
A pseudo information quality generation procedure for generating pseudo information quality representing quality lower than the target information quality during the transmission suspension period;
The adjustment procedure uses the pseudo information quality generated in the pseudo information quality generation procedure as the quality of transmission information, controls the target signal quality so that the quality satisfies the target information quality,
A transmission power control method in which a target signal quality value obtained when information transmission is resumed is a target signal quality value to be set when information transmission is resumed. The transmission power control method according to claim 2 , wherein
Measure the error of the transmission information included in the received signal at the receiving station, so as to determine the quality of the transmission information based on the measured error,
The pseudo information quality generation procedure generates a pseudo error every predetermined period as an error of the measured transmission information, generates the pseudo information quality based on the error,
A transmission power control method for obtaining the quality of the transmission information based on the measured transmission information error without taking into account the pseudo-generated error after the transmission of the information is resumed. The transmission power control method according to any one of claims 1 to 3 ,
A transmission power control method in which a target signal quality value to be set when transmission of the information is resumed is regulated to be a predetermined value or less. In the transmission power control method according to any one of claims 1 to 4 ,
In a state where information is intermittently transmitted from a transmitting station to a receiving station through a plurality of channels, the target signal quality setting procedure includes at least one of the plurality of channels after transmission of information of all channels is stopped. A transmission power control method in which, when transmission of information of one channel is resumed, a target signal quality larger than the target signal quality obtained at the time of stopping is set. The transmission power control method according to claim 5 , wherein
A transmission power control method for controlling the target signal quality so that the quality of transmission information of each channel included in the received signal at the receiving station satisfies the target information quality defined by the corresponding channel. Transmission for inner-loop control of transmission power at the transmitting station so that the quality of the received signal at the receiving station satisfies the target signal quality when wirelessly transmitting information between the transmitting station and the receiving station for each frame Transmission power provided in a receiving station that generates a power control signal and performs outer loop control of the target signal quality for each predetermined number of frames so that the quality of transmission information included in the received signal at the receiving station satisfies the target information quality A control device,
It is determined whether or not the present time is a suspension period in which information is not received, and when it is newly determined that it is a suspension period, a predetermined time interval is determined until it is confirmed that it is not a suspension period thereafter. While counting the number of time intervals that have passed so far, the target signal quality of the outer loop control target is maintained at the value in the frame immediately before the pause period,
In the frame where the transmission of information is resumed after the pause period, the target signal quality for resuming the outer loop control by adding an increment corresponding to the number of elapsed time intervals to the maintained target signal quality value . A transmission power control apparatus having setting means. The transmission power control apparatus according to claim 7 , wherein
A pseudo information quality generating means for generating pseudo information quality representing quality lower than the target information quality in the transmission suspension period;
The adjusting means controls the target signal quality so that the quality satisfies the target information quality, with the pseudo information quality generated by the pseudo information quality generating means as the quality of transmission information,
A transmission power control apparatus that uses a target signal quality value obtained when information transmission is resumed as a target signal quality value to be set when information transmission is resumed. The transmission power control apparatus according to claim 8 , wherein
Measure the error of the transmission information included in the received signal at the receiving station, so as to determine the quality of the transmission information based on the measured error,
The pseudo information quality generation means generates a pseudo error every predetermined period as an error of the measured transmission information, generates the pseudo information quality based on the error,
After the transmission of the information is resumed, pseudo error canceling means for obtaining the quality of the transmission information based on the measured transmission information error without taking the pseudo generated error into account. A transmission power control apparatus. The transmission power control apparatus according to any one of claims 7 to 9 ,
The target power setting unit is a transmission power control device configured to regulate a target signal quality value to be set when a transmission of the information is resumed to be a predetermined value or less. The transmission power control apparatus according to any one of claims 7 to 10 ,
In a state in which information is intermittently transmitted from the transmitting station to the receiving station on a plurality of channels, the target signal quality setting means is configured to stop at least one of the plurality of channels after transmission of information on all channels is stopped. A transmission power control apparatus configured to set a target signal quality larger than a target signal quality value obtained when the transmission of information on one channel is resumed. The transmission power control apparatus according to claim 11 , wherein
Transmission power control apparatus having target signal quality control means for controlling the target signal quality so that the quality of transmission information of each channel included in the received signal at the receiving station satisfies the target information quality determined by the corresponding channel .

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