JP3212019B2 - Transmission power control method in CDMA mobile communication system and CDMA mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile station and a base station for a soft handover in which a mobile station is simultaneously connected to a plurality of base stations in a code division multiple access (CDMA) mobile communication system. The present invention relates to a transmission power control method in a CDMA mobile communication system for controlling transmission power in a station and a CDMA mobile communication system.

[0002]

2. Description of the Related Art At the time of soft handover of a CDMA mobile communication system, for example, as described in Japanese Patent Application No. 7-77934, a mobile station transmits data based on transmission power control information from a plurality of base stations. Transmission power control is performed so that the power becomes smaller, and transmission power control information for the base station is determined by determining transmission power control information for the base station so that the reception quality after combining radio channels with a plurality of base stations becomes equal to the reference quality. The base station performs transmission power control based on transmission power control information from the mobile station, determines transmission power control information based on the reception quality of a radio link with the mobile station, and transmits the transmission power control information to the mobile station. , Thereby increasing the subscriber capacity.

[0003] Since transmission power control information is determined independently for each base station, it must be received before combining at the mobile station. As shown by the dotted line in FIG. 1A, the mobile station includes transmission power control information 1 and transmission power control information 1 transmitted from base stations 1 and 2, respectively.
2, the transmission power control information instructing to reduce the transmission power is selected from the transmission power control information 1 and 2, and thereby the transmission power control is performed so that the transmission power becomes smaller. ing. For example, if the transmission power control information from the base station 1 is “lower the transmission power control” and the transmission power control information from the base station 2 is “lower the transmission power control”, the mobile station will The transmission power is reduced in accordance with the transmission power control information of "reduce transmission power control" from, and transmission is performed to the base stations 1 and 2 with the reduced transmission power as shown by the solid line.

As shown by the solid line in FIG. 1 (b), when the mobile station receives a signal from the base stations 1 and 2, the mobile station combines the received signal, for example, the reception quality of the interference wave with respect to the desired wave reception level. The transmission power control information for the base stations 1 and 2 is determined so that the reception SIR after the combination is equal to the reference SIR.
2 Each of the base stations 1 and 2 receives the transmission power control information transmitted from the mobile station, and performs transmission power control based on the transmission power control information. A signal is received, transmission power control information is determined based on the received SIR of the signal, and the transmission power control information is transmitted to the mobile station.

[0005]

In the above-described transmission power control during soft handover, the mobile station cannot receive signals from the respective base stations with the same quality, and there is a possibility that only one of the reception quality is deteriorated. Yes, in this case, the error rate of the transmission power control information increases. Therefore, as described above, when control is performed to reduce the transmission power, the transmission power is reduced unnecessarily, and the communication quality deteriorates. Present in transmission power control.

Further, there is a problem described below as a problem in controlling the downlink transmission power from the base station during the soft handover.

[0007] As described above, the mobile station determines the measured reception S
Transmission power control information is determined based on the IR and transmitted to each base station, and each base station determines transmission power based on the transmission power control information from the mobile station. By the way, the mobile station ignores transmission power control information that increases transmission power and performs transmission power control according to transmission power control information that reduces transmission power. Even if the instruction to increase the transmission power of the station is ignored, it is ignored. Therefore, in one base station, there is a possibility that the reception quality of the uplink radio line is degraded,
It is possible that the transmission power control information transmitted by the mobile station is erroneously received or cannot be received. In such a case, there is a problem that there is no way to control the transmission power of the base station.

[0008] The present invention has been made in view of the above,
It is an object of the present invention to provide a transmission power control method and a CDMA mobile communication system in a CDMA mobile communication system capable of appropriately performing transmission power control during soft handover.

[0009]

To achieve the above object, according to the present invention, there is provided a mobile communication system of a code division multiple access system, which is used for a soft handover in which a mobile station is simultaneously connected to a plurality of base stations. In the mobile station, based on each transmission power control information from the plurality of base stations, performs transmission power control so that the transmission power becomes smaller, and the reception quality after combining the radio channels with the plurality of base stations is the reference quality. The transmission power control information for the base station is determined so as to be equal to and transmitted to each base station, and the base station performs transmission power control based on the transmission power control information from the mobile station, and performs a radio link with the mobile station. In a transmission power control method in a CDMA mobile communication system in which transmission power control information is determined based on the reception quality of a mobile station and transmitted to the mobile station, the mobile station receives the transmission power control information from each base station. And gist to ignore low reliability transmission power control information.

According to the first aspect of the present invention, since the mobile station ignores the transmission power control information with low reliability among the transmission power control information from each base station, the transmission power with low reliability is considered. The transmission power is not erroneously reduced according to the control information.

The present invention described in claim 2 is the same as the claim 1.
In the described invention, the mobile station measures the reception quality of the radio link with each base station, and if the measured reception quality of the radio link is equal to or less than a predetermined reference value, the mobile station receives the signal from the base station corresponding to the radio link. The gist is to ignore the transmission power control information.

According to the second aspect of the present invention, the mobile station ignores the transmission power control information from the base station corresponding to the radio channel whose reception quality is equal to or less than the predetermined reference value. The transmission power is not erroneously reduced according to the transmission power control information having low reliability.

Further, the present invention according to claim 3 provides the invention according to claim 1.
In the described invention, the mobile station measures the reception quality of the radio link with each base station, and corresponds to the radio link whose difference from the maximum reception quality of the measured reception quality of the radio link is equal to or more than a predetermined reference value. The point is to ignore the transmission power control information from the base station to perform.

According to the third aspect of the present invention, the mobile station ignores the transmission power control information from the base station corresponding to the radio line having the reception quality whose difference from the maximum reception quality is equal to or more than a predetermined reference value. Therefore, it is possible to prevent the transmission power from being erroneously reduced according to the transmission power control information having low reliability, to prevent the communication quality from deteriorating, and to make the relative reception based on the difference from the maximum reception quality. Since the transmission power control information is selected according to the level, it is possible to accurately select the transmission power control information even when the relationship between the reception quality and the transmission power control information depends on, for example, the moving speed.

According to a fourth aspect of the present invention, in a mobile communication system of a code division multiple access system, the mobile station transmits each transmission power from the plurality of base stations during soft handover in which the mobile station is simultaneously connected to the plurality of base stations. Transmission power control is performed so that the transmission power becomes smaller based on the control information, and the transmission power control information for the base station is set so that the reception quality after combining the radio channels with a plurality of base stations becomes equal to the reference quality. Is determined and transmitted to each base station, the base station performs transmission power control based on transmission power control information from the mobile station, and determines transmission power control information based on the reception quality of the radio link with the mobile station. In a transmission power control method in a CDMA mobile communication system for transmitting to a mobile station, each base station receives the transmission power control information if the reliability of the transmission power control information from the mobile station is low or receives the transmission power control information. If not, each base station summarized as determining the transmission power independently.

According to the present invention, when the reliability of the transmission power control information from the mobile station is low or when the base station cannot receive the transmission power control information, each base station independently transmits the transmission power control information. Is determined, the transmission power is not excessively increased or decreased according to the transmission power control information having low reliability.

The present invention according to claim 5 provides the present invention according to claim 4.
In the described invention, each base station measures the reception quality of the radio link with the mobile station, and ignores the transmission power control information from the mobile station if the measured reception quality of the radio link is below a predetermined reference value. The gist is that transmission at the same transmission power is continued.

According to the fifth aspect of the present invention, when the reception quality of the radio channel with the mobile station is equal to or less than a predetermined reference value, the base station ignores the transmission power control information from the mobile station and sets the same. Since the transmission is continued at the transmission power, the transmission power is not excessively increased or decreased according to the transmission power control information having low reception quality and low reliability.

Further, the present invention according to claim 6 provides the invention according to claim 4.
In the described invention, each base station measures the reception quality of the radio link with the mobile station, and ignores the transmission power control information from the mobile station if the measured reception quality of the radio link is below a predetermined reference value. Then, the transmission is stopped.

According to the present invention, the base station ignores the transmission power control information from the mobile station when the reception quality of the radio channel with the mobile station is equal to or less than a predetermined reference value, and performs transmission. , The interference can be reduced and the subscriber capacity can be increased.

According to a seventh aspect of the present invention, in the fourth aspect of the invention, each base station measures the reception quality of the radio channel with the mobile station, and the measured reception quality of the radio channel is set to a predetermined reference value. In the following cases, the gist is to ignore the transmission power control information from the mobile station and reduce the transmission power by a predetermined value.

According to the present invention, the base station ignores the transmission power control information from the mobile station when the reception quality of the radio channel with the mobile station is equal to or less than a predetermined reference value, and performs transmission. Since the power is reduced by a predetermined value, interference is reduced and subscriber capacity can be increased.

According to an eighth aspect of the present invention, in the fourth aspect of the present invention, each base station measures the reception quality of the radio channel with the mobile station, and the measured reception quality of the radio channel is set to a predetermined reference value. In the following case, the gist is to ignore the transmission power control information from the mobile station and increase the transmission power by a predetermined value.

According to the present invention, the base station ignores the transmission power control information from the mobile station when the reception quality of the radio channel with the mobile station is equal to or less than a predetermined reference value, and performs transmission. Since the power is increased by a predetermined value, the quality of the downlink communication line can be improved.

According to a ninth aspect of the present invention, in a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a wired transmission line. At the time of soft handover connected to the combining station via the mobile station performs transmission power control so that the transmission power is smaller based on each transmission power control information from a plurality of base stations, and a plurality of base stations The transmission power control information for the base station is determined and transmitted to each base station so that the reception quality after combining the wireless channels is equal to the reference quality, and the base station is based on the transmission power control information from the mobile station. A transmission power control method in a CDMA mobile communication system for performing transmission power control on a mobile station, determining transmission power control information based on reception quality of a radio channel with the mobile station, and transmitting the determined information to the mobile station. Measures the reception quality of the perch channel of each base station, transmits the measurement result as a control signal to the combining station via each base station, and the combining station compares each reception quality of the perch channel as the measurement result. The gist of the present invention is to perform control so as to stop transmission of a base station in which the difference between the reception quality and the maximum reception quality is equal to or more than a predetermined reference value.

According to the ninth aspect of the present invention, the combining station compares the measurement results of the perch channel reception quality of each base station transmitted from the mobile station, and determines that the difference from the maximum reception quality is a predetermined reference value. In order to stop the transmission of base stations that are equal to or greater than the value,
Interference is reduced and subscriber capacity is increased.

According to a tenth aspect of the present invention, in a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a wired transmission line. At the time of soft handover connected to the combining station via the mobile station performs transmission power control so that the transmission power is smaller based on each transmission power control information from a plurality of base stations, and a plurality of base stations The transmission power control information for the base station is determined and transmitted to each base station so that the reception quality after combining the wireless channels is equal to the reference quality, and the base station is based on the transmission power control information from the mobile station. Transmission power control in a CDMA mobile communication system that determines transmission power control information based on the reception quality of a radio link with a mobile station and transmits the information to the mobile station. The station measures the reception quality of the perch channel of each base station, transmits this measurement result as a control signal to the combining station via each base station, and the combining station determines the maximum of each reception quality of the perch channel as the measurement result. The transmission power control information of each base station is determined based on the base station, and each base station is notified.If the reliability of the transmission power control information from the mobile station is low, the base station notifies the base station of the transmission power control information. The gist is to perform transmission power control according to transmission power control information.

According to the tenth aspect of the present invention, the combining station determines the transmission power control information of each base station based on the maximum reception quality of the perch channel of each base station and determines the transmission power control information for each base station. Notify, and when the reliability of the transmission power control information from the mobile station is low, each base station receives the transmission power control information from the mobile station to perform transmission power control according to the transmission power control information notified from the combining station. Even in a base station that cannot perform transmission power control based on the transmission power control information combined by the combining station, highly accurate transmission power control can be performed.

According to the present invention, in a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected via a wired transmission path. At the time of soft handover connected to the combining station, the mobile station performs transmission power control so that transmission power becomes smaller based on transmission power control information from a plurality of base stations, and performs radio communication with a plurality of base stations. Transmission power control information for the base station is determined and transmitted to each base station so that the reception quality after combining the lines is equal to the reference quality, and the base station transmits based on the transmission power control information from the mobile station. In a transmission power control method in a CDMA mobile communication system for performing power control, determining transmission power control information based on reception quality of a radio channel with a mobile station, and transmitting the information to the mobile station, The reception quality of the perch channel of the base station is measured, and the measurement result is transmitted as a control signal to the combining station via each base station, and the combining station according to the ratio of the reception quality of the perch channel as the measurement result. Determine the transmission power control information of each base station, notify each base station, each base station, if the reliability of the transmission power control information from the mobile station is low, according to the transmission power control information notified from the combining station The point is to perform transmission power control.

According to the eleventh aspect of the present invention, the combining station determines transmission power control information of each base station according to the ratio of each reception quality of the perch channel of each base station and notifies each base station of the transmission power control information. However, when the reliability of the transmission power control information from the mobile station is low, each base station performs transmission power control according to the transmission power control information notified from the combining station, and therefore cannot receive the transmission power control information from the mobile station. Also in the base station, transmission power control can be performed based on the transmission power control information combined in the combining station, and highly accurate transmission power control can be performed.

According to a twelfth aspect of the present invention, in a code division multiple access mobile communication system, a mobile station is connected to a plurality of base stations at the time of soft handover, and the mobile station receives signals from a plurality of base stations. Based on the transmission power control information, the transmission power is controlled so that the transmission power becomes smaller, and the transmission power for the base station is set so that the reception quality after combining radio channels with a plurality of base stations is equal to the reference quality. The control information is determined and transmitted to each base station.The base station performs transmission power control based on the transmission power control information from the mobile station, and transmits the transmission power control information based on the reception quality of the radio line with the mobile station. In a CDMA mobile communication system for determining and transmitting to a mobile station, a reliability measuring means for measuring the reliability of transmission power control information from each base station; And summarized in that a control means for controlling to ignore the control information.

According to the twelfth aspect of the present invention, since the mobile station ignores the transmission power control information with low reliability among the transmission power control information from each base station, the transmission power with low reliability is considered. The transmission power is not erroneously reduced according to the control information.

Further, according to a thirteenth aspect of the present invention, based on the twelfth aspect, the reliability measuring means has a receiving quality measuring means for measuring a receiving quality of a radio channel with each base station, The control unit controls the transmission power control information from the base station corresponding to the radio channel when the reception quality of the radio channel measured by the reception quality measurement unit is equal to or less than a predetermined reference value. The gist is to have.

According to the thirteenth aspect of the present invention, since the transmission power control information from the base station corresponding to the radio channel whose reception quality is equal to or less than the predetermined reference value is ignored, the transmission power with low reliability is considered. The transmission power is not erroneously reduced according to the control information.

According to a fourteenth aspect of the present invention, in the twelfth aspect of the present invention, the reliability measuring means includes a receiving quality measuring means for measuring a receiving quality of a radio channel with each base station, and the control means Controls to ignore the transmission power control information from the base station corresponding to the radio channel whose difference from the maximum reception quality of the radio channel reception quality measured by the reception quality measurement means is equal to or larger than a predetermined reference value. The point is to have means.

According to the fourteenth aspect of the present invention, since the transmission power control information from the base station corresponding to the radio line of the reception quality whose difference from the maximum reception quality is equal to or more than a predetermined reference value is ignored. It is possible to prevent the transmission power from being erroneously reduced according to the transmission power control information having low reliability, prevent the communication quality from deteriorating, and transmit the data by a relative level such as based on the difference from the maximum reception quality. Since the power control information is selected, it is possible to select the power control information accurately even when the relationship between the reception quality and the transmission power control information depends on, for example, the moving speed.

According to a fifteenth aspect of the present invention, in a mobile communication system of a code division multiple access system, at the time of soft handover in which a mobile station is simultaneously connected to a plurality of base stations, the mobile station receives signals from a plurality of base stations. Based on the transmission power control information, the transmission power is controlled so that the transmission power becomes smaller, and the transmission power for the base station is set so that the reception quality after combining radio channels with a plurality of base stations is equal to the reference quality. The control information is determined and transmitted to each base station.The base station performs transmission power control based on the transmission power control information from the mobile station, and transmits the transmission power control information based on the reception quality of the radio line with the mobile station. In a CDMA mobile communication system for determining and transmitting to a mobile station, a reliability measuring means for measuring the reliability of transmission power control information from the mobile station, and when the measured reliability is low, or If you can not receive the transmission power control information, and summarized in that and a transmission power control means for determining the transmission power independently.

According to the present invention, when the reliability of the transmission power control information from the mobile station is low or when the base station cannot receive the transmission power control information, each base station independently transmits the transmission power control information. Is determined, the transmission power is not excessively increased or decreased according to the transmission power control information having low reliability.

Further, according to the present invention as set forth in claim 16, in the invention as set forth in claim 15, the reliability measuring means includes a receiving quality measuring means for measuring a receiving quality of a radio channel with a mobile station, and When the reception quality of the radio channel measured by the reception quality measurement means is equal to or less than a predetermined reference value, the power control means ignores the transmission power control information from the mobile station, and continues the transmission at the same transmission power. It is the gist to have.

According to the present invention, the base station ignores the transmission power control information from the mobile station when the reception quality of the radio channel with the mobile station is equal to or less than a predetermined reference value,
Since the transmission is continued at the same transmission power, the transmission power is not excessively increased or decreased according to the transmission power control information having low reception quality and low reliability.

According to a seventeenth aspect of the present invention, in the invention according to the fifteenth aspect, the reliability measuring means has a receiving quality measuring means for measuring a receiving quality of a radio channel with a mobile station,
When the reception quality of the radio channel measured by the transmission power control means by the reception quality measurement means is equal to or less than a predetermined reference value,
The gist of the present invention is to have means for ignoring transmission power control information from a mobile station and stopping transmission.

According to the present invention, the base station ignores the transmission power control information from the mobile station when the reception quality of the radio channel with the mobile station is equal to or less than a predetermined reference value,
Stopping the transmission reduces interference and increases subscriber capacity.

The present invention according to claim 18 is the invention according to claim 15, wherein the reliability measuring means includes a receiving quality measuring means for measuring a receiving quality of a radio channel with a mobile station, and When the reception quality of the radio channel measured by the reception quality measurement means is equal to or less than a predetermined reference value, the power control means ignores the transmission power control information from the mobile station and has means for reducing the transmission power by a predetermined value. Is the gist.

According to the eighteenth aspect of the present invention, the base station ignores transmission power control information from the mobile station when the reception quality of the radio channel with the mobile station is equal to or less than a predetermined reference value,
Since the transmission power is reduced by a predetermined value, interference can be reduced and subscriber capacity can be increased.

According to a nineteenth aspect of the present invention, in the invention according to the fifteenth aspect, the reliability measuring means has a receiving quality measuring means for measuring a receiving quality of a radio line with a mobile station, and the transmission power The control information means has means for ignoring transmission power control information from the mobile station and increasing the transmission power by a predetermined value when the reception quality of the radio channel measured by the reception quality measurement means is equal to or less than a predetermined reference value. That is the gist.

According to the nineteenth aspect of the present invention, the base station ignores the transmission power control information from the mobile station when the reception quality of the radio channel with the mobile station is equal to or less than a predetermined reference value,
Since the transmission power is increased by a predetermined value, the quality of the downlink communication line can be improved.

According to a twentieth aspect of the present invention, in a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a wired transmission line. At the time of soft handover connected to the combining station via the mobile station performs transmission power control so that the transmission power is smaller based on each transmission power control information from a plurality of base stations, and a plurality of base stations The transmission power control information for the base station is determined and transmitted to each base station so that the reception quality after combining the wireless channels is equal to the reference quality, and the base station is based on the transmission power control information from the mobile station. In a CDMA mobile communication system that performs transmission power control and determines transmission power control information based on the reception quality of a radio channel with the mobile station and transmits the transmission power control information to the mobile station, Measuring means for measuring the reception quality of the receiving channel, and transmitting means for transmitting a result measured by the measuring means as a control signal to the combining station via each base station, wherein the combining station device comprises: Comparing each reception quality of the perch channel, which is the measurement result transmitted from,
The gist of the present invention is to include control means for controlling so as to stop transmission of a base station in which a difference between the reception quality and the maximum reception quality is equal to or more than a predetermined reference value.

According to the twentieth aspect of the present invention, the combining station compares the measurement results of the perch channel reception quality of each base station transmitted from the mobile station, and determines that the difference from the maximum reception quality is a predetermined reference value. Since the transmission of the base station having the value equal to or larger than the value is stopped, interference is reduced and subscriber capacity is increased.

According to a twenty-first aspect of the present invention, in a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected via a wired transmission path. At the time of soft handover connected to the combining station, the mobile station performs transmission power control so that transmission power becomes smaller based on transmission power control information from a plurality of base stations, and performs radio communication with a plurality of base stations. Transmission power control information for the base station is determined and transmitted to each base station so that the reception quality after combining the lines is equal to the reference quality, and the base station transmits based on the transmission power control information from the mobile station. In a CDMA mobile communication system that performs power control, determines transmission power control information based on the reception quality of a radio link with a mobile station, and transmits the information to the mobile station, the mobile station apparatus includes a perch of each base station. Measuring means for measuring the reception quality of the channel, and transmitting means for transmitting a result measured by the measuring means as a control signal to the combining station via each base station. The transmission power control information of each base station is determined based on the maximum of each reception quality of the perch channel, which is the measurement result obtained, and the base station device has means for notifying each base station. In a case where the reliability of the transmission power control information is low, the gist of the present invention is to include a control unit that performs transmission power control according to the transmission power control information notified from the combining station apparatus.

According to the twenty-first aspect of the present invention, the combining station determines transmission power control information of each base station on the basis of the maximum perch channel reception quality of each base station and sends the information to each base station. Notify, and when the reliability of the transmission power control information from the mobile station is low, each base station receives the transmission power control information from the mobile station to perform transmission power control according to the transmission power control information notified from the combining station. Even in a base station that cannot perform transmission power control based on the transmission power control information combined by the combining station, highly accurate transmission power control can be performed.

According to a twenty-second aspect of the present invention, in a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a wired transmission line. At the time of soft handover connected to the combining station via the mobile station performs transmission power control so that the transmission power is smaller based on each transmission power control information from a plurality of base stations, and a plurality of base stations The transmission power control information for the base station is determined and transmitted to each base station so that the reception quality after combining the wireless channels is equal to the reference quality, and the base station is based on the transmission power control information from the mobile station. Transmission power control in a CDMA mobile communication system that determines transmission power control information based on the reception quality of a radio link with a mobile station and transmits the information to the mobile station. The station device includes a measuring unit that measures reception quality of a perch channel of each base station, and a transmitting unit that transmits a result measured by the measuring unit as a control signal to the combining station via each base station, The station device determines transmission power control information of each base station according to the ratio of each reception quality of the perch channel that is the measurement result transmitted from the transmission unit, and has a unit that notifies each base station, The gist of the present invention is that the base station apparatus includes a control unit that performs transmission power control according to the transmission power control information notified from the combining station when the reliability of the transmission power control information from the mobile station is low.

According to the present invention, the combining station determines the transmission power control information of each base station according to the ratio of each reception quality of the perch channel of each base station, and notifies each base station of the transmission power control information. However, when the reliability of the transmission power control information from the mobile station is low, each base station performs transmission power control according to the transmission power control information notified from the combining station, and therefore cannot receive the transmission power control information from the mobile station. Also in the base station, transmission power control can be performed based on the transmission power control information combined in the combining station, and highly accurate transmission power control can be performed.

[0053]

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

FIGS. 2 and 3 are block diagrams showing the configurations of a mobile station and a base station, respectively, for implementing a transmission power control method in a CDMA mobile communication system according to an embodiment of the present invention.

The mobile station shown in FIG. 2 has an antenna 11 for receiving a signal from the base station, and supplies the signal from the base station received by the antenna 11 to the reception radio section 15 via the transmission / reception separation section 13. Then, the receiving radio unit 15 sends the signals to the despreading units 17 and 1.
9. The despreading units 17 and 19 are supplied with signals from the base stations 1 and 2 in a soft handover state in which the mobile station is simultaneously connected to the two base stations 1 and 2 as shown in FIG. Each signal is despread using each spreading code. The despread signal is demodulated by demodulation units 37 and 39, respectively, and supplied to a transmission power control bit extraction unit 43.

The despreading units 17 and 19 have a desired wave reception power detection unit 21, an interference wave reception power detection unit 23, a desired wave reception power detection unit 25, and an interference wave reception power detection unit 27, respectively. Then, the desired wave reception power and the interference wave reception power from the base stations 1 and 2 are detected. The desired wave reception power and the interference wave reception power detected by the desired wave reception power detection unit 21 and the interference wave reception power detection unit 23 of the despreading unit 17 are supplied to the SIR calculation unit 33, where the desired wave reception power The received SIR, which is the ratio of the interference wave received power to the received SIR, is calculated. Further, the desired wave reception power and the interference wave reception power detected by the desired wave reception power detection unit 25 and the interference wave reception power detection unit 27 of the despreading unit 19 are SI
The received SIR is supplied to the R calculation unit 35, where the reception SIR, which is a ratio between the desired wave reception power and the interference wave reception power, is calculated.

The received SIRs detected by the SIR calculators 33 and 35 are supplied to a transmission power control bit selector 45.

Further, the desired wave reception power detection units 21 and 25 of the despreading units 17 and 19 and the interference wave reception power detection unit 23,
The desired wave reception power and the interference wave reception power respectively detected at 27 are supplied to the maximum ratio combining unit 31, where the maximum ratio combining is performed, and the combined reception SIR is supplied to the transmission power control bit determining unit 41. You. The transmission power control bit determining unit 41 determines the reception SI after combining from the maximum ratio combining unit 31.
A transmission power control bit, which is transmission power control information, is determined based on R and supplied to the signal generator 49.

The signal generator 49 forms a transmission signal including the transmission power control bit from the transmission power control bit determiner 41 and supplies the transmission signal to the modulator 51. The transmission signal is transmitted to the modulation section 51.
, And is spread by the spreading section 52 to be transmitted by the transmission radio section 53.
Supplied to

The transmission power control bit extraction section 43 extracts transmission power control bits, which are transmission power control information from the base stations 1 and 2 included in the demodulated signals from the demodulation sections 37 and 39, respectively. It is supplied to the selection unit 45. The transmission power control bit selection unit 45 selects the transmission power control bit from the transmission power control bit extraction unit 43 based on the received SIR from the SIR calculation units 33 and 35, and uses the selected transmission power control bit for transmission power control. To the unit 47.

Transmission power control section 47 controls the transmission power from transmission radio section 53 based on the transmission power control bits. The transmission radio unit 53 outputs a transmission signal with the transmission power controlled by the transmission power control unit 47, and transmits the transmission signal from the antenna 11 to each base station via the transmission / reception separation unit 13.

The base station shown in FIG. 3 has an antenna 61 for receiving a signal from a mobile station. A signal received by the antenna 61 is amplified by a common receiving amplifier 65 via a transmission / reception separating unit 63, Are supplied to the channel units 69a to 69n.

In each of the channel units 69a to 69n,
The reception signal from the mobile station supplied from the common reception amplifier 65 is supplied to the despreading unit 73 via the reception radio unit 71, where it is despread using a spreading code. The despread signal is demodulated by the demodulation unit 79 and supplied to the transmission power control bit extraction unit 81. Transmission power control bit extraction section 81 extracts transmission power control bits, which are transmission power control information from the mobile station, included in the demodulated signal from demodulation section 79 and supplies the transmission power control bits to transmission power control section 83.

The despreading unit 73 has a desired wave reception power detection unit 75 and an interference wave reception power detection unit 77, where the desired wave reception power and the interference wave reception power from the mobile station are detected, and the SIR It is supplied to the calculation unit 85. The SIR calculation unit 85 calculates the reception SIR, which is the ratio between the desired wave reception power and the interference wave reception power from the desired wave reception power detection unit 75 and the interference wave reception power detection unit 77, and determines the transmission power control bit. And a transmission power control unit 83.

The transmission power control bit determining unit 87
The transmission power control bit is determined based on the reception SIR from the calculation unit 85 and supplied to the signal generation unit 89. The signal generation unit 89 forms a transmission signal including the transmission power control bit from the transmission power control bit determination unit 87 and supplies the transmission signal to the modulation unit 91. This transmission signal is modulated by modulation section 91 and spread section 9
3 and is supplied to the transmission radio unit 95.

Transmission power control section 83 controls the transmission power from transmission radio section 95 based on the transmission power control bits from transmission power control bit extraction section 81 and the received SIR from SIR calculation section 85. The transmission radio section 95 outputs a transmission signal with transmission power controlled by the transmission power control section 83, and transmits the transmission signal from the antenna 61 to the mobile station via the common transmission amplifier 67 and the transmission / reception separation section 63.

Next, the operation of the CDMA mobile communication system having the mobile station and the base station configured as described above will be described.

In the CDMA mobile communication system, FIG.
As shown in FIG. 2, during a soft handover in which a mobile station is simultaneously connected to a plurality of (two in this example) base stations 1 and 2, as described above, the mobile station receives signals from each of the base stations 1 and 2. Based on each transmission power control information, the transmission power is controlled so that the transmission power becomes smaller, and the base station is controlled so that the reception quality after combining the radio channels with the base stations 1 and 2 becomes equal to the reference quality. Is determined and transmitted to each of the base stations 1 and 2. Each of the base stations 1 and 2 performs transmission power control based on the transmission power control information from the mobile station, and establishes a wireless link with the mobile station. The transmission power control information is determined based on the reception quality and is transmitted to the mobile station, thereby increasing the subscriber capacity. In such a process at the time of soft handover, in the present embodiment, as shown in FIG. SIR calculator provided in mobile station In steps 3 and 35, the reception SIR from each of the base stations 1 and 2 is calculated, and the calculated reception SIR is supplied to the transmission power control bit selection section 45, whereby the transmission power control bit selection section 45 extracts the transmission power control bit. The transmission power control bit from each of the base stations 1 and 2 supplied from the unit 43 is based on the reception SIR, and if the reception SIR is equal to or less than a predetermined reference value, the transmission power control bit corresponding to the reception SIR is changed. It is controlled not to select.

More specifically, for example, assuming that a predetermined reference value of the reception SIR is 3 dB, the SIR calculation units 35 and 3
If the reception SIR calculated in step 7 is 3 dB or less,
The transmission power control bit corresponding to the reception SIR is not selected. Then, the remaining transmission power control bit is supplied to the transmission power control unit 47, thereby performing transmission power control.

When all the received SIRs are 3 dB or less, all the transmission power control bits are not selected. In this case, the transmission power control is not performed, and
The current transmission power is maintained. By performing such control, it is possible to prevent the transmission power from being erroneously reduced according to the low-reliability transmission power control bit, and to prevent deterioration in communication quality.

In the transmission power control method according to another embodiment, the mobile station calculates the reception SIR from each of the base stations 1 and 2 by using the SIR calculation units 33 and 35, and uses the calculated reception SIR as the transmission power. When the difference between the received SIR and the maximum received SIR is greater than or equal to a predetermined reference value, the transmission power from the base station corresponding to the received SIR is supplied to the control bit selector 45. Control is performed so that control information is ignored and not selected.

More specifically, for example, the reception SIR
Assuming that the reference value of the difference from the maximum reception SIR is 5 dB,
When the maximum reception SIR is 8 dB, the reception SIR is 3 d
The transmission power control bits below B are not selected.

By performing selection control in this way, it is possible to prevent the transmission power from being erroneously reduced in accordance with the transmission power control bit having low reliability, and to prevent deterioration of communication quality. Also, since the presence or absence of selection is controlled by the difference between the reception SIRs, that is, the transmission power control information is selected based on a relative level such as based on the difference from the maximum reception SIR, the reception SIR and the transmission power Even when the relationship with the control information depends on, for example, the moving speed, the selection can be made with high accuracy.

As still another embodiment of the transmission power control method, when the base station during soft handover performs downlink transmission power control, the base station uses the SIR calculation unit 85 shown in FIG. The reception SIR is calculated, and the calculated reception SIR is supplied to the transmission power control unit 83. The transmission power control unit 83 compares the reception SIR with a predetermined reference value or less, and if the reception SIR is equal to or less than the predetermined reference value, ignores the transmission power control bit from the mobile station and outputs the same transmission power. The transmission radio unit 95 is controlled so as to continue the transmission in the transmission.

For example, when the predetermined reference value is 3 dB, the reception SI from the mobile station calculated by the SIR calculation section 85 is calculated.
When R is equal to or less than 3 dB, the transmission power control unit 83 ignores the transmission power control bit from the mobile station and performs control to maintain the same transmission power. By performing the transmission power control in this way, the transmission power is not excessively increased or decreased according to an erroneous transmission power control bit.
When the reception SIR exceeds the reference value, the transmission power control is restarted. At this time, the transmission power can be made equal to the transmission power when the ignoring of the transmission power control bit is started.

As still another embodiment of the transmission power control method, when the base station performing soft handover performs downlink transmission power control, the base station uses the SIR calculation unit 85 to calculate the reception SIR of the radio channel from the mobile station. The calculated reception SIR is supplied to the transmission power control unit 83. The transmission power control unit 83 compares the reception SIR with a predetermined reference value or less, and if the reception SIR is below the predetermined reference value, ignores the transmission power control bit from the mobile station and stops transmission. To control.

For example, when the predetermined reference value is 3 dB, the reception SI from the mobile station calculated by the SIR calculation section 85 is calculated.
When R is 3 dB or less, the transmission power control unit 83 ignores the transmission power control bit from the mobile station and stops transmission.

In general, there is a correlation between uplink and downlink propagation losses, so that transmission power can be reduced by transmitting from a base station with a large reception SIR rather than from a base station with a small reception SIR. . Therefore, as described above, by stopping transmission from a base station having a small reception SIR, interference can be reduced and subscriber capacity can be increased.

As still another embodiment of the transmission power control method, when the base station during soft handover performs downlink transmission power control, the base station uses the SIR calculation unit 85 to calculate the reception SIR of the radio channel from the mobile station. The calculated reception SIR is supplied to the transmission power control unit 83. The transmission power control unit 83 compares the reception SIR with a predetermined reference value or less, and if the reception SIR is equal to or less than the predetermined reference value, ignores the transmission power control bit from the mobile station and reduces the transmission power. The transmission power is controlled so as to decrease by a predetermined value.

For example, when the predetermined reference value is 3 dB, the reception SI from the mobile station calculated by the SIR calculation section 85 is calculated.
When R is 3 dB or less, the transmission power control unit 83 ignores the transmission power control bit from the mobile station and performs transmission power control to reduce the transmission power by, for example, 1 dB.

As described above, by reducing the transmission power from the base station having a small reception SIR, interference can be reduced and the subscriber capacity can be increased. Further, since transmission is not completely stopped, stable transmission power control can be maintained even when the uplink and downlink propagation losses do not match or when the reception SIR value between both base stations frequently reverses.

As a transmission power control method of another embodiment,
When the base station performing the soft handover performs downlink transmission power control, the base station calculates the reception SIR of the radio channel from the mobile station by the SIR calculation unit 85 and supplies the calculated reception SIR to the transmission power control unit 83. I do. The transmission power control unit 83 compares the reception SIR with a predetermined reference value or less,
If the reception SIR is equal to or less than a predetermined reference value, the transmission power control bit from the mobile station is ignored and the transmission power is controlled so that the transmission power is increased by a predetermined value.

For example, when the predetermined reference value is 3 dB, the reception SI from the mobile station calculated by the SIR calculation section 85 is calculated.
If R is 3 dB or less, the transmission power control unit 83 ignores the transmission power control bit from the mobile station and performs transmission power control to increase the transmission power by, for example, 1 dB.

As described above, by increasing the transmission power from the base station having a small reception SIR, the quality of the downlink communication line is improved. Therefore, the reliability of the transmission power control information transmitted from the base station to the mobile station is improved, and highly accurate mobile station transmission power control can be performed.

As another transmission power control method according to another embodiment of the present invention, a case where downlink transmission power control from a base station during soft handover is performed via a combining station is shown in FIG.
This will be described with reference to FIG.

FIG. 4 is a diagram showing a mobile station 3, two base stations 1 and 2, a combining station 5, and a control signal termination node 7 during soft handover in a CDMA mobile communication system. In the figure, a mobile station 3 has a downlink radio channel 12 from the base station 1 and a downlink radio channel 14 from the base station 2.
And a common uplink radio line 16 is transmitted to the base stations 1 and 2. The base station 1 is connected to the combining station 5 via a wired line 22, the base station 2 is connected to the combining station 5 via a wired line 24, and the combining station 5 is connected to the control signal termination node 7. .

In the mobile communication system during soft handover connected as described above, a plurality of signals from the base stations 1 and 2 to the mobile station 3 are combined in the mobile station 3 and are transmitted from the mobile station 3 to the base stations 1 and 2. Are further transmitted from the base stations 1 and 2 to the combining station 5, and a plurality of signals from the base stations 1 and 2 to the combining station 5 are combined in the combining station 5. The control signal transmitted by the mobile station 3 is transmitted through the base stations 1 and 2 to the combining station 5.
Are transmitted to the control signal termination node 7 from the combining station 5. The transmission power control bits are transmitted and received between the mobile station 3 and the base stations 1 and 2.

Incidentally, the mobile station receives the SI from the base station.
The transmission power control information is determined based on R and transmitted to each base station. Each base station determines the transmission power based on the transmission power control information from the mobile station, and the mobile station increases the transmission power. Such transmission power control information is ignored, and transmission power control is performed according to transmission power control information for reducing transmission power.
Even if an instruction to increase the transmission power of the mobile station is ignored, the reception quality of the uplink radio channel may be degraded at one base station, and the transmission power transmitted by the mobile station may be degraded. It is conceivable that control information may be erroneously received or cannot be received, and in such a case, there is no way to control transmission power in the base station as described above.

In order to solve such a problem, in the present embodiment, the mobile station 3 measures the reception SIR of the perch channel of each of the base stations 1 and 2 and transmits the measured perch channel reception SIR to the control signal. To the control signal termination node 7 via the base stations 1 and 2 and the combining station 5. The control signal terminal node 7 compares the perch channel reception SIRs of the base stations 1 and 2 to determine the transmission power from each of the base stations 1 and 2, and notifies the base stations 1 and 2 of the transmission power. Each of the base stations 1 and 2 performs transmission power control according to the transmission power. In this case, instead of performing the comparison of the perch channel reception SIR of each of the base stations 1 and 2 and the process of determining the transmission power based on the comparison in the control signal termination node 7, the combining station 5 may perform the processing. The control signal termination node 7 may be considered as a part of the combining station 5.

The mobile station 3 measures the perch channel reception SIR of each of the base stations 1 and 2 and uses the measured perch channel reception SIR as a control signal to control the base station and the combining station 5. Via the control signal terminal node 7 When receiving the perch channel reception SIR of each of the base stations 1 and 2 as the control signal, the control signal terminal node 7
Are compared, and the transmission from the base station corresponding to the reception SIR whose difference from the maximum reception SIR is equal to or more than a predetermined reference value is stopped. Other base stations perform normal transmission power control based on the transmission power control bits between the mobile station and the base station as described above.

More specifically, assuming that the reference value of the received SIR difference is 5 dB, if the maximum received SIR is 8 dB, the combining station 5 stops transmission to a base station whose received SIR is 3 dB or less. To the base station via.

As described above, the perch channel reception S
By stopping transmission from a base station with a small IR,
The interference can be reduced, the subscriber capacity can be increased, and the transmission stop is determined based on the reception quality of the perch channel. Therefore, an accurate determination can be made according to the downlink propagation loss.

In still another embodiment in which downlink transmission power control from a base station during soft handover is performed via a combining station, a mobile station 3 shown in FIG. The channel reception SIR is measured, and the measured perch channel reception SIR is transmitted to the control signal termination node 7 via the base station and the combining station 5 as a control signal. The control signal terminal node 7 determines the transmission power of each of the base stations 1 and 2 based on the higher value of the perch channel reception SIR, and notifies each of the base stations 1 and 2. Then, each of the base stations 1 and 2 performs transmission power control with the transmission power from the control signal terminal node 7 in the base station having low reliability of the transmission power control bit from the mobile station 3 that is receiving. The other base stations perform normal transmission power control based on the transmission power control bits between the mobile station and the base station as described above.

More specifically, for example, the base station 1
If the measurement result of the perch channel reception SIR of the base station 2 is 10 dB, the measurement result of the perch channel reception SIR of the base station 2 is 15 dB, and the required reception SIR of the communication channel is 5 dB, the transmission power of the perch channel is reduced. Each of the base stations 1 and 2 is notified that the value is 10 dB lower than the power. For example, a base station having a reception SIR of 0 dB and having low reliability of the transmission power control bit controls the transmission power according to the notification result.

By performing transmission power control in this manner, even in a base station that cannot receive transmission power control bits, transmission power control can be performed based on the combined control signal. It becomes possible.

Further, as still another embodiment in which downlink transmission power control from a base station during soft handover is performed via a combining station, in FIG. Measuring the perch channel reception SIR,
The measured perch channel reception SIR is transmitted as a control signal to the control signal termination node 7 via the base station and the combining station 5. The control signal termination node 7 determines transmission power control according to the perch channel reception SIR ratio, and notifies each of the base stations 1 and 2. Each of the base stations 1 and 2 performs transmission power control at the transmission power specified by the control signal terminal node 7 in the base station having a low reliability of the received transmission power control bit. The other base stations perform normal transmission power control based on the transmission power control bits between the mobile station and the base station as described above.

More specifically, for example, the measurement result of the perch channel reception SIR of the base station 1 is 10 dB, the measurement result of the perch channel reception SIR of the base station 2 is 15 dB, and the required reception SIR of the communication channel is 5 dB.
In the case of dB, the base station 1 and the base station 1 are notified of the transmission power of the base station 1 as a value 15 dB lower than the perch channel and the transmission power of the base station 2 as a value 10 dB lower than the perch channel. For example, a base station having a reception SIR of 0 dB and low reliability of the transmission power control bit controls the transmission power according to the notification result.

By performing transmission power control in this manner, even a base station that cannot receive the transmission power control bit from mobile station 3 can perform transmission power control based on the combined transmission power control information, and achieve high accuracy. In addition to enabling high transmission power control, and further reducing the transmission power at the base station having a small perch channel reception SIR,
Interference can be reduced and subscriber capacity can be increased.

[0099]

As described above, according to the present invention,
Since the mobile station ignores the low-reliability transmission power control information among the transmission power control information from each base station, the mobile station does not erroneously reduce the transmission power in accordance with the low-reliability transmission power control information, and can perform communication. Quality degradation can be prevented.

Further, according to the present invention, since the mobile station ignores the transmission power control information from the base station corresponding to the radio channel whose reception quality is equal to or less than the predetermined reference value, the reception quality is low and the reliability is low. It is possible to prevent the transmission power from being erroneously reduced according to the low transmission power control information, and to prevent the communication quality from deteriorating.

Further, according to the present invention, since the mobile station ignores the transmission power control information from the base station corresponding to the radio channel of the reception quality whose difference from the maximum reception quality is equal to or more than the predetermined reference value, The transmission power is prevented from being erroneously reduced according to the transmission power control information having low reliability, the communication quality can be prevented from deteriorating, and the transmission power is determined by a relative level based on a difference from the maximum reception quality. Since the control information is selected, it is possible to select the control information accurately even when the relationship between the reception quality and the transmission power control information depends on, for example, the moving speed.

According to the present invention, when the reliability of the transmission power control information from the mobile station is low or when the transmission power control information cannot be received, each base station determines the transmission power independently. In addition, the transmission power is not excessively increased or decreased in accordance with the transmission power control information having low reliability, so that deterioration of the communication quality can be prevented.

Further, according to the present invention, when the reception quality of the radio channel with the mobile station is equal to or less than a predetermined reference value,
Since the transmission power control information from the mobile station is ignored and the transmission is continued at the same transmission power, the transmission power is not excessively increased or decreased according to the low-reliability transmission power control information with low reception quality. Quality degradation can be prevented.

Further, according to the present invention, when the reception quality of a radio channel with a mobile station is equal to or less than a predetermined reference value,
Since transmission power control information from the mobile station is ignored and transmission is stopped, interference can be reduced and subscriber capacity can be increased.

According to the present invention, the base station ignores the transmission power control information from the mobile station and reduces the transmission power by the predetermined value when the reception quality of the radio channel with the mobile station is equal to or lower than a predetermined reference value. In addition, interference can be reduced, subscriber capacity can be increased, and transmission is not completely stopped, so that uplink and downlink propagation losses do not match, and the reception quality between , Stable transmission power control can be maintained.

According to the present invention, the base station ignores the transmission power control information from the mobile station and increases the transmission power by a predetermined value when the reception quality of the radio channel with the mobile station is lower than a predetermined reference value. Therefore, the quality of the downlink communication line can be improved, and therefore, the reliability of the transmission power control information transmitted from the base station to the mobile station is improved, and highly accurate mobile station transmission power control can be performed. it can.

Further, according to the present invention, the combining station compares the measurement results of the perch channel reception quality of each base station transmitted from the mobile station, and the difference from the maximum reception quality is equal to or greater than a predetermined reference value. Since the transmission of the base station is stopped, the interference is reduced, the subscriber capacity can be increased, and the transmission stop is determined based on the reception quality of the perch channel, so that an accurate determination according to the downlink propagation loss can be made. It becomes possible.

Further, according to the present invention, the combining station determines transmission power control information of each base station based on the maximum perch channel reception quality of each base station and notifies each base station of the transmission power control information. When the reliability of the transmission power control information from the mobile station is low, the base station performs transmission power control according to the transmission power control information notified from the combining station, so that the base station that cannot receive the transmission power control information from the mobile station Also, transmission power control can be performed based on transmission power control information combined by the combining station, and highly accurate transmission power control can be performed.

According to the present invention, the combining station determines the transmission power control information of each base station according to the ratio of each reception quality of the perch channel of each base station, and notifies each base station of the transmission power control information. If the reliability of the transmission power control information from the mobile station is low,
Since the transmission power control is performed according to the transmission power control information notified from the combining station, even in a base station that cannot receive the transmission power control information from the mobile station, the transmission power control is performed based on the transmission power control information combined by the combining station. This makes it possible to perform transmission power control with high accuracy, and further reduces transmission power in a base station having a low perch channel reception quality, thereby reducing interference and increasing subscriber capacity.

[Brief description of the drawings]

FIG. 1 is a diagram showing a base station and a mobile station during soft handover of a CDMA mobile communication system.

FIG. 2 is a block diagram illustrating a configuration of a mobile station that implements a transmission power control method in a CDMA mobile communication system according to an embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a base station that implements a transmission power control method in a CDMA mobile communication system according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating a connection relationship among a mobile station, a base station, a combining station, and a control signal termination node that performs a transmission power control method in a CDMA mobile communication system according to another embodiment of the present invention.

[Explanation of symbols]

 1, base station 3 mobile station 5 combining station 7 control signal termination node 33 mobile station SIR calculation section 41 mobile station transmission power control bit determination section 43 mobile station transmission power control bit extraction section 45 mobile station transmission power control Bit selection unit 47 Transmission power control unit of mobile station 81 Transmission power control bit extraction unit of base station 83 Transmission power control unit of base station 85 SIR calculation unit of base station 87 Transmission power control bit determination unit of base station

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-218932 (JP, A) JP-A-4-92518 (JP, A) JP-A-7-298333 (JP, A) Table 7- 502631 (JP, A) Table 9-507115 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04B ^7/ 24-7/26 102 H04Q ^7/ 00-7/38

Claims (22)

(57) [Claims] In a mobile communication system of a code division multiple access system, during a soft handover in which a mobile station is simultaneously connected to a plurality of base stations, the mobile station transmits power based on transmission power control information from the plurality of base stations. The transmission power control information for the base station is determined such that the reception quality after combining the radio channels with a plurality of base stations is equal to the reference quality by performing transmission power control so that The base station performs transmission power control based on transmission power control information from the mobile station, determines transmission power control information based on the reception quality of a radio link with the mobile station, and transmits the CDMA to the mobile station. A transmission power control method in a mobile communication system, wherein the mobile station ignores low-reliability transmission power control information among transmission power control information from each base station.
A transmission power control method in a DMA mobile communication system. 2. The mobile station measures the reception quality of a radio link with each base station. If the measured reception quality of the radio link is equal to or less than a predetermined reference value, the mobile station receives a signal from the base station corresponding to the radio link. The transmission power control method in a CDMA mobile communication system according to claim 1, wherein the transmission power control information is ignored. 3. The mobile station measures the reception quality of a radio link with each base station, and corresponds to a radio link whose difference from the measured reception quality of the radio link is greater than or equal to a predetermined reference value. 2. The transmission power control method in a CDMA mobile communication system according to claim 1, wherein the transmission power control information from the base station is ignored. 4. In a mobile communication system of a code division multiple access system, at the time of soft handover in which a mobile station is simultaneously connected to a plurality of base stations, the mobile station transmits power based on transmission power control information from the plurality of base stations. The transmission power control information for the base station is determined such that the reception quality after combining the radio channels with a plurality of base stations is equal to the reference quality by performing transmission power control so that The base station performs transmission power control based on transmission power control information from the mobile station, determines transmission power control information based on the reception quality of a radio link with the mobile station, and transmits the CDMA to the mobile station. In the transmission power control method in the mobile communication system, each base station transmits to each base station when the reliability of the transmission power control information from the mobile station is low or when the transmission power control information cannot be received. C, characterized by determining the transmission power independently
A transmission power control method in a DMA mobile communication system. 5. Each base station measures the reception quality of a radio channel with a mobile station, and ignores transmission power control information from the mobile station if the measured reception quality of the radio channel is equal to or less than a predetermined reference value. The transmission power control method in a CDMA mobile communication system according to claim 4, wherein transmission with the same transmission power is continued. 6. Each base station measures the reception quality of a radio channel with a mobile station, and ignores transmission power control information from the mobile station if the measured reception quality of the radio channel is equal to or less than a predetermined reference value. 5. The transmission power control method in a CDMA mobile communication system according to claim 4, wherein the transmission is stopped. 7. Each base station measures the reception quality of the radio link with the mobile station, and if the measured reception quality of the radio link is less than a predetermined reference value, ignores the transmission power control information from the mobile station. 5. The transmission power control method in a CDMA mobile communication system according to claim 4, wherein the transmission power is reduced by a predetermined value. 8. Each base station measures the reception quality of a radio link with a mobile station, and if the measured reception quality of the radio link is equal to or less than a predetermined reference value, ignores transmission power control information from the mobile station. The transmission power control method in a CDMA mobile communication system according to claim 4, wherein the transmission power is increased by a predetermined value. 9. In a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a combining station via a wired transmission path. During a soft handover, the mobile station performs transmission power control based on transmission power control information from a plurality of base stations so that transmission power becomes smaller, and performs reception after combining radio lines with a plurality of base stations. The transmission power control information for the base station is determined and transmitted to each base station so that the quality is equal to the reference quality, and the base station performs transmission power control based on the transmission power control information from the mobile station. A transmission power control method in a CDMA mobile communication system for determining transmission power control information based on the reception quality of a radio link with a base station and transmitting the transmission power control information to the mobile station, comprising the steps of: And transmits the measurement result as a control signal to the combining station via each base station.The combining station compares the respective reception qualities of the perch channels as the measurement results, and determines the maximum of the reception quality. A transmission power control method in a CDMA mobile communication system, characterized by controlling to stop transmission of a base station whose difference from reception quality is equal to or more than a predetermined reference value. 10. In a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a combining station via a wired transmission path. During a soft handover, the mobile station performs transmission power control based on transmission power control information from a plurality of base stations so that transmission power becomes smaller, and performs reception after combining radio lines with a plurality of base stations. The transmission power control information for the base station is determined and transmitted to each base station so that the quality is equal to the reference quality, and the base station performs transmission power control based on the transmission power control information from the mobile station. A transmission power control method in a CDMA mobile communication system for determining transmission power control information based on the reception quality of a radio link with a base station and transmitting the transmission power control information to the mobile station, comprising: The received result is measured as a control signal and transmitted as a control signal to the combining station via each base station. The transmission power control information of the station is determined and notified to each base station.If the reliability of the transmission power control information from the mobile station is low, the transmission power is determined according to the transmission power control information notified from the combining station. A transmission power control method in a CDMA mobile communication system, comprising performing control. 11. In a code division multiple access mobile communication system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a combining station via a wired transmission path. During a soft handover, the mobile station performs transmission power control based on transmission power control information from a plurality of base stations so that transmission power becomes smaller, and performs reception after combining radio lines with a plurality of base stations. The transmission power control information for the base station is determined and transmitted to each base station so that the quality is equal to the reference quality, and the base station performs transmission power control based on the transmission power control information from the mobile station. A transmission power control method in a CDMA mobile communication system for determining transmission power control information based on the reception quality of a radio link with a base station and transmitting the transmission power control information to the mobile station, comprising: And transmits the measurement result as a control signal to the combining station via each base station, and the combining station determines the reception quality of each base station according to the ratio of the reception quality of the perch channel as the measurement result. Determine the transmission power control information and notify each base station.If the reliability of the transmission power control information from the mobile station is low, each base station performs transmission power control according to the transmission power control information notified from the combining station. A transmission power control method in a CDMA mobile communication system. 12. In a code division multiple access mobile communication system, during a soft handover in which a mobile station is simultaneously connected to a plurality of base stations, the mobile station transmits power based on transmission power control information from the plurality of base stations. The transmission power control information for the base station is determined such that the reception quality after combining the radio channels with a plurality of base stations is equal to the reference quality by performing transmission power control so that The base station performs transmission power control based on transmission power control information from the mobile station, determines transmission power control information based on the reception quality of a radio link with the mobile station, and transmits the CDMA to the mobile station. In the mobile communication system, a reliability measuring means for measuring the reliability of the transmission power control information from each base station, and a control for ignoring the measured low reliability transmission power control information. C, characterized in that it comprises a that control means
DMA mobile communication system. 13. The reception level measurement unit includes a reception quality measurement unit that measures reception quality of a radio channel with each base station; and the control unit receives the radio channel measured by the reception quality measurement unit. 13. The CDMA mobile communication system according to claim 12, further comprising means for performing control such that transmission power control information from a base station corresponding to the radio channel is ignored when the quality is equal to or less than a predetermined reference value. 14. The reliability measuring means includes a receiving quality measuring means for measuring a receiving quality of a radio link with each base station, and the control means receives the radio link measured by the receiving quality measuring means. 13. The method according to claim 12, further comprising: means for controlling so as to ignore transmission power control information from a base station corresponding to a radio channel whose difference from the maximum reception quality is equal to or greater than a predetermined reference value. CDMA mobile communication system. 15. In a mobile communication system of a code division multiple access system, at the time of soft handover in which a mobile station is simultaneously connected to a plurality of base stations, the mobile station transmits power based on transmission power control information from the plurality of base stations. The transmission power control information for the base station is determined such that the reception quality after combining the radio channels with a plurality of base stations is equal to the reference quality by performing transmission power control so that The base station performs transmission power control based on transmission power control information from the mobile station, determines transmission power control information based on the reception quality of a radio link with the mobile station, and transmits the CDMA to the mobile station. In a mobile communication system, a reliability measuring means for measuring reliability of transmission power control information from a mobile station, and when the measured reliability is low or when transmission power control information cannot be received. If, CDMA mobile communication system; and a transmission power control means for determining the transmission power independently. 16. The radio communication apparatus according to claim 16, wherein the reliability measuring unit includes a reception quality measuring unit that measures reception quality of a radio channel with a mobile station, and the transmission power control unit includes a radio communication channel measured by the reception quality measuring unit. 16. The CDMA mobile communication system according to claim 15, further comprising means for ignoring transmission power control information from the mobile station when reception quality is equal to or lower than a predetermined reference value, and continuing transmission at the same transmission power. . 17. The radio communication apparatus according to claim 17, wherein the reliability measurement unit includes a reception quality measurement unit that measures reception quality of a radio channel with a mobile station, and the transmission power control unit includes a radio channel measurement unit that measures the radio channel measured by the reception quality measurement unit. 16. The CDMA mobile communication system according to claim 15, further comprising means for ignoring transmission power control information from the mobile station and stopping transmission when the reception quality is equal to or lower than a predetermined reference value. 18. The radio communication apparatus according to claim 18, wherein the reliability measurement unit includes a reception quality measurement unit that measures reception quality of a radio channel with the mobile station, and the transmission power control unit includes a radio channel measured by the reception quality measurement unit. 16. The CDMA mobile communication system according to claim 15, further comprising means for ignoring transmission power control information from the mobile station when the reception quality is equal to or lower than a predetermined reference value, and reducing transmission power by a predetermined value. 19. The reliability measuring means includes a receiving quality measuring means for measuring a receiving quality of a radio link with a mobile station, and the transmission power control information means is a radio link measured by the receiving quality measuring means. 16. The CDMA mobile communication system according to claim 15, further comprising means for ignoring transmission power control information from the mobile station and increasing the transmission power by a predetermined value when the reception quality is equal to or lower than a predetermined reference value. 20. In a code division multiple access mobile communication system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a combining station via a wired transmission path. During a soft handover, the mobile station performs transmission power control based on transmission power control information from a plurality of base stations so that transmission power becomes smaller, and performs reception after combining radio lines with a plurality of base stations. The transmission power control information for the base station is determined and transmitted to each base station so that the quality is equal to the reference quality, and the base station performs transmission power control based on the transmission power control information from the mobile station. In a CDMA mobile communication system in which transmission power control information is determined based on the reception quality of a radio channel to transmit to a mobile station, the mobile station apparatus measures the reception quality of a perch channel of each base station. And a transmitting means for transmitting a result measured by the measuring means as a control signal to the combining station via each base station, wherein the combining station device uses the measurement result transmitted from the transmitting means. It is characterized by having control means for comparing each reception quality of a certain perch channel and stopping transmission of a base station whose difference from the maximum reception quality is equal to or more than a predetermined reference value. CDMA mobile communication system. 21. In a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a combining station via a wired transmission path. During a soft handover, the mobile station performs transmission power control based on transmission power control information from a plurality of base stations so that transmission power becomes smaller, and performs reception after combining radio lines with a plurality of base stations. The transmission power control information for the base station is determined and transmitted to each base station so that the quality is equal to the reference quality, and the base station performs transmission power control based on the transmission power control information from the mobile station. In a CDMA mobile communication system in which transmission power control information is determined based on the reception quality of a radio channel to transmit to a mobile station, the mobile station apparatus measures the reception quality of a perch channel of each base station. And a transmitting unit that transmits a result measured by the measuring unit as a control signal to the combining station via each base station, and the combining station device is a measurement result transmitted from the transmitting unit. The base station apparatus has means for determining transmission power control information of each base station based on the maximum reception quality of each perch channel, and notifying each base station of the transmission power control information. A CDMA mobile communication system, comprising: a control unit that performs transmission power control according to the transmission power control information notified from the combining station apparatus when reliability is low. 22. In a mobile communication system of a code division multiple access system, a mobile station is simultaneously connected to a plurality of base stations via a radio line, and the plurality of base stations are connected to a combining station via a wired transmission path. During a soft handover, the mobile station performs transmission power control based on transmission power control information from a plurality of base stations so that transmission power becomes smaller, and performs reception after combining radio lines with a plurality of base stations. The transmission power control information for the base station is determined and transmitted to each base station so that the quality is equal to the reference quality, and the base station performs transmission power control based on the transmission power control information from the mobile station. A transmission power control method in a CDMA mobile communication system for determining transmission power control information based on the reception quality of a radio link with a base station and transmitting the transmission power control information to a mobile station. Measuring means for measuring the reception quality of the channel, and transmitting means for transmitting a result measured by the measuring means as a control signal to the combining station via each base station; Means for determining transmission power control information of each base station according to the ratio of each reception quality of the perch channel, which is the measurement result obtained, and notifying each base station. A CDMA mobile communication system, comprising: control means for performing transmission power control according to the transmission power control information notified from a combining station when reliability of the transmission power control information is low.