JPH09102768A - Mobile communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the transmission power for an up link with higher accuracy by providing a means to put together the signal components of channels of a down link at a base station after amplification or attenuation and based on the receiving state of the up link. SOLUTION: The encoding circuits 206 of both transmitting parts 205 and 210 encode the information on a channel 1 or 2 and send them to the spread spectrum circuits 207 respectively. The circuits 207 diffuse the encoded information by the spread spectrum codes allocated to the channel 1 or 2 and send the spread information to the amplification/attenuation circuits 208. The circuits 208 amplify or attenuate the spread spectrum signals to the large and small power of the receiving correlation value sent from the comparators 203 of both receiving parts 201 and 209 respectively and transmit the base band signals to a synthesizing circuit 106. The circuit 106 applied the up conversion to the base band signals received from the circuits 208 to send the radio signals to a radio transmitting circuit 104 and to transmit the radio signals through an antenna 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication device in which a base station side device and a mobile station side device are widely used indoors and outdoors for wireless communication.

[0002]

2. Description of the Related Art The multiple access system is a line connection system in which a plurality of stations simultaneously communicate in the same frequency band. CDMA (Code Division Multiple Acces
s) is code division multiple access, and is a technique for performing multiple access by spread spectrum communication in which the spectrum of an information signal is spread over a band sufficiently wider than the original information signal bandwidth for transmission. The direct spreading method is a method of spreading a signal band by multiplying an information signal by a spreading sequence code. TDD (Time Division Duplex) is a method of performing communication in which the same radio frequency band is used for transmission and reception, and transmission and reception are alternately repeated by time division into a transmission section and a reception section, and is also called a ping-pong method. As an advantage of the TDD system, it is known that transmission diversity can be applied to a base station, so that space diversity is unnecessary in a mobile station and downsizing can be achieved.

The received wave that has passed through the mobile propagation path is subject to fluctuations in intensity and phase called fading, which causes deterioration of the transmission system. Diversity reception using a plurality of received waves is a technique for reducing the influence of fading in order to realize high quality transmission. Spatial diversity among them is one of diversity techniques for obtaining a plurality of fading reception waves that fluctuate independently by using a plurality of spatially separated reception antennas. On the other hand, the transmission diversity is a technique of estimating the transmission line state of the transmission band in each anthena and transmitting from an antenna having a good transmission line state.

In the case of the TDD system, since the transmission and reception are in the same frequency band system, the frequency characteristics of fading fluctuations of the transmission wave and the reception wave are equal, and if the switching time of both is sufficiently short, the mutual fading fluctuations are correlated. Since it is high, it is possible to estimate the transmission path state in the transmission / reception frequency band from the fading fluctuation of the received wave. Therefore, by applying the transmission diversity, it is possible to relatively easily reduce the influence of the fading fluctuation of the transmission wave. As a result, high line quality can be realized for each individual channel.

The CDMA system is a system for simultaneously transmitting information signals of a plurality of channels spread by different spreading codes in the same frequency band. The receiving side can separate the information signal of each channel by using the same code as the spreading code used on the transmitting side. In this system, signals are transmitted in the same frequency band, and therefore, for a certain channel, of all signals in that frequency band, signals other than the signal of its own channel (signals of other channels) become noise. Therefore, the higher the ratio of the signal component of the own channel to the entire signal, the higher the communication quality of that channel. A high proportion of signal components in a certain channel means a high proportion of noise components in the other channels. Therefore, in the CDMA communication, the communication quality of the entire system is the highest and the subscriber capacity is the largest when the ratio of the signal components of each channel to the entire signal is equal at the receiving point.

Further, in the CDMA system, in the downlink (communication line from the base station to the mobile station), if the base stations combine the signals to the mobile stations at the same ratio, all mobile stations will receive the entire received signal. The ratio of the signal components of each channel occupied is equal. This is because the signals of all channels are transmitted from the same base station with the same component ratio and received through the same propagation path.

On the other hand, in the uplink (communication line from the mobile station to the base station), the position of each mobile station is different in the area, and the signal propagation environment such as the distance from the base station is different. Therefore, when the signals are transmitted with the same signal power, a certain channel signal arrives at the base station without being significantly attenuated, and a signal of another channel arrives at the base station after being greatly attenuated. In this case, the ratio of the signal component of each channel to the entire received signal at the base station varies, the communication quality of each channel is not uniform, and the subscriber capacity is reduced. Therefore, in the uplink, it is necessary to control the transmission signal of the mobile station so that the ratio of the signal components of each channel to the entire reception signal of the base station is equal, and this transmission power control technology is highly advanced. It is the key to realize a capacity communication device.

The transmission power control system for this mobile station includes a closed loop system for transmitting a control signal from a base station,
There is an open loop system in which the mobile station controls independently. In the closed loop method, information for mobile station transmission power control must be transmitted from the base station to the mobile station.
Conventionally, such power control information is transmitted as 1-bit or multi-bit digital information. For example, in the case of 1-bit information, if the bit is 1, the transmission power is higher than before, and if it is 0, the transmission power is lower than before. The base station transmits 1 as the power control information bit if the received signal power of a certain channel is small, and transmits 0 as the power control information bit if it is large. By repeating such control, the transmission power of the channel assigned to each mobile station is adjusted to an appropriate value, and the ratio of the signal component of each channel to the total received signal power at the base station is made uniform. You can

[0009]

However, the CDAA communication for controlling the uplink transmission power by the conventional closed loop system has the following problems. (1) Even though the transmission power is controlled in the uplink as compared with the downlink in which the transmission power may not be controlled,
Since the ideal control cannot be performed, the communication quality becomes low. (2) Since it is necessary to transmit the transmission power information for controlling the communication device, the transmission rate of the user information is reduced accordingly. (3) When performing error correction coding across frames and interleaving (rearranging the signal order), the base station transmits transmission power control information, and then the mobile station deinterleaves the received signal (based on the signal order). A large delay occurs until the transmission power is actually controlled by performing rearrangement for restoration), error correction decoding. (4) If error correction is not performed, the reliability of control information is low, the accuracy of transmission power control is reduced, and the communication quality and subscriber capacity are reduced.

The present invention has been made to solve the above problems, and provides a mobile communication device capable of realizing more accurate transmission power control and improving the communication quality of the uplink. The purpose is to do.

[0011]

In order to achieve the above-mentioned object, the present invention amplifies or attenuates the signal components of each channel of the downlink on the base station side according to the reception state of the uplink and combines them. It is provided with a means for doing so.

[0012]

Therefore, according to the present invention, the transmission quality of the downlink is relatively high, and the transmission power of the downlink is controlled for each channel to reduce the transmission rate of user information. In addition, the transmission power control of the uplink can be performed with higher accuracy without causing a control delay due to error correction processing or the like.

[0013]

【Example】

(Embodiment 1) FIG. 1 shows a configuration of a base station apparatus of a mobile communication apparatus in a first embodiment of the present invention. FIG.
In the figure, 101 is an antenna, 102 is a transmission / reception changeover switch, 103 is a wireless reception circuit, 104 is a wireless transmission circuit, 105 is a received signal distribution circuit, and 106 is a transmission signal synthesis circuit. 201 is a first receiver for channel 1. In the first receiving unit 201, 202 is a despreading circuit, 203 is a comparison circuit, and 204 is a decoding circuit. 205 is a first transmitter for channel 1.
In the first transmission unit 205, 206 is an encoding circuit, 2
Reference numeral 07 is a diffusion circuit, and 208 is an amplification / attenuation circuit. 20
Reference numeral 9 is a second receiving unit for channel 2, which has the same configuration as the first receiving unit 201. Reference numeral 210 denotes a second transmission unit for channel 2, which has the same configuration as the first transmission unit 205. Despreading circuit 20 of receivers 201 and 209
2 are respectively connected to the distribution circuit 105, and the transmitter 20
The amplifying / attenuating circuits 208 of 5 and 210 are connected to the combining circuit 106, respectively.

Next, the operation of the base station apparatus in this embodiment will be described. The antenna 101 is switched by the transmission / reception switch 102 and is alternately connected to the wireless reception circuit 103 and the wireless transmission circuit 104. At the time of reception, the wireless signal received by the antenna 101 is transmitted to the wireless reception circuit 103 through the transmission / reception changeover switch 102. The wireless reception circuit 103 down-converts the wireless signal into a baseband signal and transmits it to the distribution circuit 105. The distribution circuit 105 distributes the baseband signal to the number of channels and transmits it to the despreading circuits 202 of the reception units 201 and 209 of each channel. Each receiving unit 201 and 20
The despreading circuit 202 of 9 obtains a correlation value between the spreading code assigned to channel 1 or channel 2 and the baseband signal that has been spread and synthesized, and sends it to the comparison circuit 203 and the decoding circuit 204. Each comparison circuit 203 transmits the power of the correlation value to the amplification / attenuation circuit 208 of the transmission units 205 and 210, respectively. Each transmitter 2
The decoding circuits 204 of 05 and 210 respectively decode the information signal of channel 1 or channel 2 based on the correlation value.

The coding circuit 206 of each of the transmission units 205 and 210 codes the information of channel 1 or channel 2 and sends it to the spreading circuit 207. Each spreading circuit 20
In 7, the encoded information is spread by the spreading code assigned to channel 1 or channel 2 and transmitted to the amplification / attenuation circuit 208. In each amplification / attenuation circuit 208, according to the power of the reception correlation value transmitted from the comparison circuit 203 of each reception unit 201 and 209, the spread signal is amplified if the power is large, and the spread signal is attenuated if the power is small. , And transmits the baseband signal to the synthesis circuit 106. The synthesizing circuit 106 up-converts the baseband signal transmitted from the amplifying / attenuating circuit 208 of each transmitting unit 205 and 210 and transmits the radio signal to the radio transmitting circuit 104. The wireless transmission circuit 104 sends a wireless signal to be transmitted from the antenna 101 through the transmission / reception switching circuit 102.

FIG. 2 shows the configuration of the mobile station apparatus in this embodiment. In FIG. 2, 1 is an antenna, 2 is a transmission / reception change-over switch, 3 is a radio receiving circuit, 4 is a radio transmitting circuit, and 5 is a receiving level (power of correlation value) comparison circuit. Reference numeral 11 denotes a receiving unit connected to the radio receiving circuit 3, which includes a despreading circuit 12 and a decoding circuit 13 connected to the despreading circuit 12. The despreading circuit 12 is also connected to the comparison circuit 5. Reference numeral 21 is a transmission unit connected to the wireless transmission circuit 4, and includes a coding circuit 22 and a spreading circuit 23 connected to the coding circuit 22. The spreading circuit 23 is connected to the wireless transmission circuit 4.

Next, the operation of the mobile station apparatus in this embodiment will be described. The antenna 1 is switched by the transmission / reception changeover switch 2 so that the wireless reception circuit 3 and the wireless transmission circuit 4 are switched.
Are connected alternately. At the time of reception, the radio signal received by the antenna 1 is transmitted to the radio reception circuit 3 through the transmission / reception changeover switch 2. The radio receiving circuit 3 down-converts the radio signal into a baseband signal and transmits the baseband signal to the despreading circuit 12 of the receiving unit 11. Despreading circuit 12
Calculates the correlation value between the assigned spreading code and the spread and synthesized baseband signal, and the comparison circuit 5
And to the decoding circuit 13. The decoding circuit 13 decodes the information signal based on the correlation value. The comparison circuit 5 notifies the wireless transmission circuit 4 of an amplification amount that increases as the power decreases, such as the reciprocal of the power, according to the power of the correlation value. Transmitter 21
Encoding circuit 22 encodes the information signal to spread circuit 2
Tell 3. The spreading circuit 23 spreads the spread code assigned to the information signal to the wireless transmission circuit 4. The wireless transmission circuit 4 up-converts the baseband signal, amplifies the wireless signal according to the amount of amplification from the comparison circuit 5, and transmits / receives the antenna 1 through the transmission / reception switching circuit 102.
Send from 01.

(Embodiment 2) FIG. 3 shows a configuration of a base station apparatus of a mobile communication apparatus according to a second embodiment of the present invention, in which two antennas are provided and two channels are provided. Is. In FIG. 3, 101a is the first antenna,
101b is a second antenna. 102a, 102b
Is a transmission / reception changeover switch, 103a and 103b are wireless reception circuits, 104a and 104b are wireless transmission circuits, and 105
a and 105b are reception signal distribution circuits, and 106a and 106b.
Reference symbol b is a transmission signal combining circuit. 301 is a first receiver for channel 1. In the first receiving unit 301, 302 is a despreading circuit for the first antenna 101a,
303 is a despreading circuit for the second antenna 101b, and 30
Reference numeral 4 is a correlation value selecting / synthesizing circuit, 305 is a correlation value comparing circuit, and 306 is a decoding circuit. 307 is a first transmitter for channel 1. In the first transmission unit 307, 308 is an encoding circuit, 309 is a spreading circuit, 310 is an amplification / attenuation circuit, and 311 is an antenna changeover switch. A second receiver 312 for channel 2 has the same configuration as the first receiver 301. A second transmission unit 313 for channel 2 has the same configuration as the first transmission unit 307. The despreading circuit 302 of the receiving units 301 and 312 is connected to the distribution circuit 105a for the first antenna 101a, and the despreading circuit 303 is connected to the distribution circuit 105b for the second antenna 101b. The antenna changeover switches 311 of the transmission units 307 and 313 are connected to the combining circuit 106a for the first antenna 101a and the combining circuit 106b for the second antenna 101b, respectively.

Next, the operation of the base station apparatus in this embodiment will be described. The antennas 101a and 101b are switched by the transmission / reception change-over switches 102a and 102b so that the wireless reception circuits 103a and 103b and the wireless transmission circuit 1 can be switched.
04a and 104b are alternately connected. At the time of reception, the radio signals received by the antennas 101a and 101b are transmitted to the radio reception circuits 103a and 103b through the transmission / reception changeover switches 102a and 102b. The radio receiving circuits 103a and 103b down-convert the radio signals to convert them into baseband signals and distribute them to the distribution circuits 105a and 1b.
Tell 05b. The distribution circuit 105a distributes the baseband signal to the number of channels and transmits the baseband signal to the despreading circuit 302 for the antennas 101a of the reception units 301 and 312 of each channel. The distribution circuit 105b distributes the baseband signal to the number of channels and receives the reception units 301 and 31 of the respective channels.
2 to the despreading circuit 303 for the antenna 101b.
The despreading circuits 302 and 30 of the receiving units 301 and 312, respectively.
3 obtains the correlation value between the spread code assigned to channel 1 or channel 2 and the baseband signal that has been spread and synthesized, and sends the correlation values to the comparison circuit 305 and the selection / synthesis circuit 304, respectively. The comparison circuit 305 compares the correlation values for the number of antennas, selects an antenna with a large power, and transmits the result to the selection / combination circuit 304 and the antenna changeover switch 311. Selection / synthesis circuit 30
Reference numeral 4 indicates that the correlation value corresponding to the number of antennas is switched to a correlation value having a large power based on the selection result from the comparison circuit 305, or the correlation value corresponding to the number of antennas is weighted by a ratio or the like according to the power and combined. And informs the decoding circuit 306. The selection / combination circuit 304 also conveys the power of the selected or combined signal to the amplification / attenuation circuit 310 of the transmission units 307 and 313. The decoding circuit 306 of each receiving unit 310, 312 decodes the channel 1 or channel 2 information signal based on the selected or combined signal.

The coding circuit 308 of each of the transmitters 307 and 313 codes the information of channel 1 or channel 2 and sends it to the spreading circuit 309. Each spreading circuit 30
In 9, the encoded information is spread by the spreading code assigned to channel 1 or channel 2 and transmitted to the amplification / attenuation circuit 310. In each amplification / attenuation circuit 310, depending on the power transmitted from the selection / synthesis circuit 304 of each reception unit 301 and 312, if the power is large, the spread signal is amplified, and if the power is small, the spread signal is attenuated to switch the antenna. Tell switch 311. The antenna changeover switch 311 is connected to the antenna selected by the comparison circuit 305 so that the combination circuit 106a or 106b is connected.
Switch to and transmit the baseband signal. Each synthesis circuit 1
06a and 106b up-convert the baseband signal transmitted from the amplifying / attenuating circuit 310 of each transmitting unit 307 and 313 to wirelessly transmit circuits 104a and 104b.
Tell The wireless transmission circuits 104a and 104b transmit the wireless signals to be transmitted to the transmission / reception switching circuits 102a and 10b, respectively.
2b through the respective antennas 101a, 101b
Sent from.

The configuration of the mobile station apparatus according to the present embodiment is the same as that of the first embodiment shown in FIG. 2 and the operation is also the same, so duplicated description will be omitted.

(Embodiment 3) Next, a third embodiment of the present invention will be described. The configuration and operation of the base station apparatus in this embodiment is the same as in the second embodiment. FIG. 4 shows the configuration of the mobile station apparatus in this embodiment, and is an example in the case of two antennas. 1a is a first antenna and 1b is a second antenna. 2a and 2b are transmission / reception changeover switches, 3a and 3b are radio receiving circuits, 4a,
Reference numeral 4b is a wireless transmission circuit. 31 is a receiver, 32
Is a despreading circuit for the first antenna 1a connected to the wireless receiving circuit 3a, and 33 is a despreading circuit for the second antenna 1b connected to the wireless receiving circuit 3b. Reference numeral 34 is a correlation value selecting / combining circuit, 35 is a correlation value comparing circuit connected to each despreading circuit 32, 33 and the selecting / combining circuit, 36
Is a decoding circuit. 41 is a transmitter, 42 is a coding circuit, 43 is a spreading circuit, 44 is an antenna changeover switch, and 45 is a comparison circuit. The antenna changeover switch 44 is connected to each of the wireless transmission circuits 4a and 4b and the comparison circuit 35 of the reception unit 31, and the comparison circuit 45 includes the selection / combination circuit 34 of each of the wireless transmission circuits 4a and 4b and the reception unit 31.
It is connected to the.

Next, the operation of the mobile station apparatus in this embodiment will be described. The antennas 1a and 1b are switched by the transmission / reception changeover switches 2a and 2b, respectively, and are alternately connected to the wireless reception circuits 3a and 3b and the wireless transmission circuits 4a and 4b. At the time of reception, the radio signals received by the antennas 1a and 1b are transmitted and received by the transmission and reception changeover switch 2 respectively.
It is transmitted to the wireless receiving circuits 3a and 3b through a and 2b. The wireless receiving circuit 3a down-converts the wireless signal into a baseband signal and transmits the baseband signal to the spreading circuit 32 for the first antenna 1a of the receiving unit 11. Radio receiving circuit 3
b down-converts the radio signal to convert it into a baseband signal and sends it to the spreading circuit 33 for the second antenna 1b of the receiving unit 11. Each of the despreading circuits 32 and 33 obtains a correlation value between the assigned spreading code and the spread and synthesized baseband signal, and sends it to the comparison circuit 35 and the selection / synthesis circuit 34. The comparison circuit 35 compares the correlation values for the number of antennas, selects an antenna with a large power, and transmits the result to the selection / combination circuit 34 and the antenna changeover switch 44. The selection / synthesis circuit 34
Based on the selection result from the comparison circuit 35, a correlation value having a large number of antennas is switched to a correlation value having a large power, or the correlation values having a large number of antennas are weighted and combined by a ratio according to the power, and decoded. Tell circuit 36. The selection / combination circuit 34 also conveys the power of the selected or combined signal to the comparison circuit 45 of the transmitter 41. Decoding circuit 36
Decodes the information signal based on the selected or combined signals.

The coding circuit 42 of the transmission unit 41 codes the information signal and sends it to the spreading circuit 43. In the spreading circuit 43, the coded information is spread by the spreading code assigned to its own channel and transmitted to the antenna changeover switch 44. The antenna changeover switch 44 is the comparison circuit 3
Switch to either the wireless transmission circuit 4a or 4b so as to connect to the antenna selected in 5. On the other hand, the comparison circuit 45 increases the amplification amount such as the reciprocal of the power as the power becomes smaller, such as the reciprocal of the power, according to the power of the correlation value transmitted from the selection / combination circuit 34 of the reception unit 31.
Tell a, 4b. The wireless transmission circuit 4a or 4b selected by the antenna changeover switch 44 is the spreading circuit 43.
The baseband signal transmitted from the antenna is up-converted and transmitted from the antenna 1a or 1b through the transmission / reception switching circuits 2a and 2b.

(Embodiment 4) FIG. 5 shows a configuration of a base station apparatus of a mobile communication apparatus according to a fourth embodiment of the present invention, in which two antennas and two channels are provided. Is. In FIG. 5, the configuration from an antenna (not shown) to each receiving unit 401, 417 and each transmitting unit 410, 418 is the same as the configuration of the second embodiment shown in FIG. 401 is a first receiving unit for channel 1. In the first receiving unit 401, 402 is a despreading circuit for the first antenna 101a, 403 is a despreading circuit for the second antenna 101b, and 404 is the first antenna 1a.
Phase detection circuit for the second antenna 101b, 406 a phase compensation circuit for the first antenna 1a, 407 a phase compensation circuit for the second antenna 101b, and 408 a correlation value of the correlation value. The receiving / synthesizing circuit and 409 are decoding circuits. 410 is the first transmitter for channel 1. In the first transmission unit 410, 411 is an encoding circuit, 412 is a spreading circuit, 413 is an amplification / attenuation circuit, and 4
Reference numeral 14 is a transmission distribution circuit for a transmission signal, 415 is a phase adjustment circuit for the first antenna 101a, and 416 is a phase adjustment circuit for the second antenna 101b. 417 is channel 2
Is a second reception unit for, and has the same configuration as the first reception unit 401. A second transmitter 418 for channel 2 has the same configuration as the first transmitter 410.
Each despreading circuit 402 of the receiving units 401 and 410 is connected to the reception distribution circuit 105a for the first antenna 101a, and each despreading circuit 403 is connected to the reception distribution circuit 105b for the second antenna 101b. There is. Transmission unit 41
The phase adjusting circuits 415 of 0 and 418 are respectively connected to the transmission combining circuit 106a for the first antenna 101a, and the phase adjusting circuits 416 are respectively connected to the second antenna 1a.
It is connected to the transmission combining circuit 106b for 01b.

Next, the operation of the base station apparatus in this embodiment will be described. The operation from the antennas 101a and 101b to the receiving units 401 and 417 is the same as that in the second embodiment. The despreading circuits 402 and 403 of the receiving units 401 and 417 find correlation values between the respective spreading codes assigned to channel 1 or channel 2 and the baseband signals that have been spread and combined, and respectively obtain the first value. Phase detection circuit 404 and phase compensation circuit 406 for the antenna 101a of the second antenna 101, and the second antenna 1
This is transmitted to the phase detection circuit 405 for 01b and the phase compensation circuit 407. The phase detection circuit 404 detects the phase of the reception wave of the first antenna 101a from the correlation value, and the phase compensation circuit 406 and the phase adjustment circuit 4 of each of the transmission units 410 and 418.
Tell 15 The phase detection circuit 405 determines the second value from the correlation value.
The phase of the received wave of the antenna 101b is detected and transmitted to the phase compensation circuit 407 and the phase adjustment circuit 416 of each of the transmission units 410 and 418. The phase compensating circuit 406 controls the first antenna 1 for the phase sent from the phase detecting circuit 404.
The correlation value of 01a is corrected and transmitted to the reception combining circuit 408. The phase compensation circuit 407 corrects the correlation value of the second antenna 101b by the amount of the phase sent from the phase detection circuit 405 and sends it to the reception synthesis circuit 408. Reception synthesis circuit 40
Reference numeral 8 is a weighted combination of correlation values whose phases are corrected by the number of antennas, such as a ratio according to the power, and synthesizes them.
Tell 09. The reception combining circuit 408 also conveys the power of the combined signal to the amplification / attenuation circuit 413 of the transmission units 410 and 418. Decoding circuit 3 of each receiving unit 410, 417
06 decodes the information signal of channel 1 or channel 2 based on the respective combined signals.

The coding circuits 411 of the respective transmitting sections 410 and 418 respectively code the information of channel 1 or channel 2 and send it to the spreading circuit 412. Each spreading circuit 41
In 2, the coded information is spread by the spreading code assigned to channel 1 or channel 2 and transmitted to the amplification / attenuation circuit 413. In each amplifying / attenuating circuit 413, depending on the power transmitted from the reception combining circuit 408 of each receiving unit 401 and 417, if the power is large, the spread signal is amplified, and if the power is small, the spread signal is attenuated and the transmission distribution circuit Tell 414. The transmission distribution circuit 414 distributes the transmission signal and transmits it to the phase adjustment circuits 415 and 416. The phase adjustment circuit 415 adjusts the phase of the transmission signal of the first antenna 101a by the amount of the phase detected by the phase detection circuit 404 of each of the reception units 401 and 417, and the transmission synthesis circuit 1
Tell 06a. The phase adjustment circuit 416 is used by each reception unit 40.
The phase of the transmission signal of the second antenna 101b is adjusted by the amount of the phase detected by the phase detection circuit 405 of Nos. 1 and 417, and the result is transmitted to the transmission synthesis circuit 106b. Each synthesis circuit 106
The operation after a and 106b is the same as the operation of the second embodiment.

The configuration of the mobile station apparatus in this embodiment is the same as that of the first embodiment shown in FIG. 2 and the operation is also the same, so duplicated description will be omitted.

(Fifth Embodiment) The fifth embodiment of the present invention is a combination of the base station apparatus in the fourth embodiment and the mobile station apparatus in the third embodiment, and its operation. Is the same as described in each embodiment.

(Embodiment 6) A sixth embodiment of the present invention uses the base station apparatus in the fourth embodiment and combines it with a mobile station apparatus having the configuration shown in FIG. The operation of the base station device is the same as that described in the fourth embodiment. In FIG. 6, 1a is the first antenna, and 1a
b is the second antenna. 2a and 2b are transmission / reception changeover switches, 3a and 3b are radio receiving circuits, and 4a and 4b are radio transmitting circuits. Reference numeral 51 is a receiving unit, 52 is a despreading circuit for the first antenna 1a connected to the wireless receiving circuit 3a, and 53 is a despreading circuit for the second antenna 1b connected to the wireless receiving circuit 3b. . 54 is a phase detection circuit for the first antenna 1a, and 55 is the second antenna 101.
b is a phase detecting circuit, 56 is a phase compensating circuit for the first antenna 1a, 57 is a phase compensating circuit for the second antenna 101b, 58 is a receiving / synthesizing circuit for correlation values, and 59 is a decoding circuit. 61 is a transmission unit, 62 is an encoding circuit, and 63.
Is a spreading circuit, 64 is a transmission distribution circuit, 65 is a phase adjustment circuit for the first antenna 101a connected to the wireless transmission circuit 4a, and 66 is a phase adjustment for the second antenna 101b connected to the wireless transmission device 4b. A circuit, 67 is a comparison circuit connected to the reception combining circuit 58 of the receiving unit 51, and is connected to the wireless transmission circuits 4a and 4b.

Next, the operation of the mobile station apparatus in this embodiment will be described. Each of the antennas 1a and 1b includes a transmission / reception changeover switch 2a. It is switched by 2b and is alternately connected to the wireless reception circuits 3a and 3b and the wireless transmission circuits 4a and 4b. At the time of reception, the radio signals received by the antennas 1a and 1b are transmitted and received by the transmission and reception changeover switch 2 respectively.
It is transmitted to the wireless receiving circuits 3a and 3b through a and 2b. The radio receiving circuit 3a down-converts the radio signal into a baseband signal, and transmits the baseband signal to the despreading circuit 52 for the first antenna 1a of the receiving unit 51. The radio receiving circuit 3b down-converts the radio signal into a baseband signal, and transmits the baseband signal to the despreading circuit 53 for the second antenna 1b of the receiving unit 51. Each despreading circuit 52 and 53
Is the spreading code assigned to its channel,
The correlation value with the spread and synthesized baseband signal is obtained, and the phase detection circuit 54 and the phase compensation circuit 56 for the first antenna 101a or the second antenna 101, respectively.
It is transmitted to the phase detection circuit 55 for b and the phase compensation circuit 57.
The phase detection circuit 54 determines the first antenna 101 based on the correlation value.
The phase of the received wave of a is detected and transmitted to the phase compensation circuit 56 and the phase adjustment circuit 65 of the transmission unit 61. The phase detection circuit 55 detects the phase of the reception wave of the second antenna 101b from the correlation value, and transmits it to the phase compensation circuit 57 and the phase adjustment circuit 66 of the transmission unit 61. The phase compensating circuit 56 is configured so that the phase of the first antenna 1 corresponding to the phase sent from the phase detecting circuit 54 is increased.
The correlation value of 01a is corrected and transmitted to the reception synthesis circuit 58.
The phase compensation circuit 57 corrects the correlation value of the second antenna 101b by the amount of the phase sent from the phase detection circuit 55 and sends it to the reception synthesis circuit 58. The reception synthesizing circuit 58 weights the correlation values of which the phases are corrected by the number of antennas with a ratio or the like according to the power, synthesizes them, and sends them to the decoding circuit 59.
The receiving / combining circuit 58 also transmits the power of the combined signal to the comparing circuit 67 of the transmitting unit 61. The decoding circuit 59 of the receiving unit 51 decodes the information signal based on the combined signal.

The coding circuit 62 of the transmitter 61 codes the information signal and sends it to the spreading circuit 63. In the spreading circuit 63, the coded information is spread by the spreading code assigned to the channel and transmitted to the transmission distribution circuit 64. The transmission distribution circuit 64 distributes the transmission signal to divide each of the phase adjustment circuits 65 and 6 into
Tell 6 The phase adjustment circuit 65 is configured so that the phase of the first antenna 1 is equal to the phase detected by the phase detection circuit 54 of the reception unit 51.
The phase of the transmission signal of 01a is adjusted, and the wireless device circuit 4a
Tell The phase adjustment circuit 66 is configured to operate the second antenna 10 by the amount of the phase detected by the phase detection circuit 55 of the receiver 51.
The phase of the transmission signal of 1b is adjusted and transmitted to the wireless transmission circuit 4b. According to the power of the correlation value, the comparison circuit 67 transmits a small amplification amount to the wireless transmission circuits 4a and 4b when the power is large and a large amplification amount when the power is small. The wireless transmission circuits 4a and 4b up-convert the baseband signals transmitted from the phase adjustment circuits 65 and 66, respectively, and amplify the wireless signals amplified according to the amplification amount from the comparison circuit 67 to the transmission / reception changeover switches 2a and 2b. Through the antenna 1a or 1b, respectively.

(Effect of Embodiment) As described above, the CDM
In A transmission, the ratio of the signal components of each channel to the entire signal must be equal at the receiving point. Therefore, in the uplink, it is necessary to control the transmission power so that the ratio of the transmission signals from the mobile stations at different positions becomes equal in the base station. The state of the transmission line between each mobile station and the base station fluctuates due to distance fluctuations and fading fluctuations.

On the other hand, in TDD transmission, the same frequency band is alternately used for the uplink and the downlink. Therefore, if the switching interval between the uplink and the downlink is sufficiently short, the state of the transmission line at the time of transmission can be easily estimated from the state of the received signal.

Assuming that the components of each channel are equally transmitted from the base station, the condition of the transmission path between the mobile station and the base station is good if the reception level of the downlink of the mobile station is high. It can be estimated that Therefore, if transmission is performed with a small amount of power in the uplink, the base station can receive it at an appropriate level. On the other hand, if the downlink reception level of another mobile station is low, it can be inferred that the state of the transmission path between the mobile station and the base station is poor. Therefore, if transmission is performed with a large amount of power in the uplink, the base station can receive it at an appropriate level.

However, due to the accuracy of the reception level measurement at the mobile station and the influence of the noise component of the correlation value due to the components of other channels, the ratio of the signal component of each channel to the total received signal of the uplink in the base station. Difference will occur and the communication quality will vary.

Therefore, as shown in the first to sixth embodiments, the ratio of the signal component of each channel of the downlink is adjusted according to the reception state of the uplink. At the base station,
When the ratio of the signal component of a certain channel to the entire received signal of the uplink is large, the ratio of the signal component of this channel to the entire transmitted signal in the downlink is increased a little. In the mobile station corresponding to this channel, the received signal level of the downlink becomes higher than it should be because the base station increased the ratio a little at the time of transmission. Therefore,
The uplink transmission power is a little lower than the original transmission power. Therefore, the ratio of the signal component of this channel to the entire received signal of the uplink at the base station is slightly low. On the other hand, in the base station, when the ratio of the signal component of another channel to the entire received signal of the uplink is small, the ratio of the signal component of this channel to the entire transmitted signal in the downlink is made a little lower. In the mobile station corresponding to this channel, the received signal level of the downlink becomes lower than it should be because the base station has a slightly lower ratio when transmitting. Therefore, the uplink transmission power is a little higher than the original transmission power. For this reason,
The ratio of the signal component of this channel to the entire received signal of the uplink at the base station becomes a little higher.

As a result, when the ratio of the signal component of a certain channel to the entire received signal of the uplink at the base station is high at a certain time point, the ratio at the next time point becomes a little low. On the contrary, the ratio of the signal component of a certain channel to the entire received signal of the uplink at the base station at a certain time point becomes a little higher at the next time point. Therefore, by repeating such control, the ratio of the signal components of each channel to the entire received signal of the uplink at the base station becomes equal.

Further, as shown in the third to sixth embodiments, the phase of the received signal of each antenna is detected during reception,
By adding the opposite phase difference to the transmission signal of each antenna in advance according to the phase difference at the time of transmission, the phase is aligned on the receiving side of this signal, and the same signal is transmitted from multiple antennas. It becomes possible to do. At this time, by detecting the power of the reception signal of each antenna at the time of reception and controlling the power of the transmission signal whose phase is adjusted according to the ratio of the power at the time of transmission, on the side receiving this signal,
Performance similar to maximum ratio combining at reception can be obtained. By setting the power of the transmission signal from a certain antenna to a non-zero value and setting the power of the transmission signal from another antenna to zero, the same effect as when one antenna is actually selected and transmitted can be obtained. You can also

[0040]

As described above, according to the present invention, by controlling the downlink transmission power in accordance with the uplink reception power in the base station, the uplink transmission power control in the mobile station can be enhanced. It has the effect that it can be performed accurately.

Since the transmission power of the downlink is made different for each signal destined to each mobile station, the communication quality of the downlink will be lowered, but since the communication quality of the downlink is originally higher than that of the uplink, If the transmission power control of the downlink is performed while suppressing the deterioration of the quality so that it does not fall below the communication quality of the uplink, the accuracy of the transmission power control of the uplink is increased by this, and the communication quality of the uplink is improved. And, there is an effect that the overall communication quality of the downlink is improved.

Further, since the uplink transmission power control information transmitted from the base station to the mobile station has nothing to do with transmission correction coding as downlink power, there is no delay due to processing such as coding / decoding / interleaving. It also has the effect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a base station of a mobile communication device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a mobile station of a mobile communication device in first, second and fourth embodiments of the present invention.

FIG. 3 is a block diagram showing a configuration of a base station of a mobile communication device in second and third embodiments of the present invention.

FIG. 4 is a block diagram showing a configuration of a mobile station of a mobile communication device in third and fifth embodiments of the present invention.

FIG. 5 is a block diagram showing a configuration of a base station of a mobile communication device in fourth, fifth and sixth embodiments of the present invention.

FIG. 6 is a block diagram showing a configuration of a mobile station of a mobile communication device according to a sixth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 101 antenna 102 transmission / reception switch 103 wireless reception circuit 104 wireless transmission circuit 105 distribution circuit 106 combining circuit 201 first receiving unit 202 despreading circuit 203 comparing circuit 204 decoding circuit 205 first transmitting unit 206 encoding circuit 207 spreading circuit 208 Amplifying / attenuating circuit 209 Second receiving unit 210 Second transmitting unit 1 Antenna 2 Transmission / reception switching circuit 3 Radio receiving circuit 4 Radio transmitting circuit 5 Comparison circuit 11 Receiving unit 12 Despreading circuit 13 Decoding circuit 21 Transmitting unit 22 Encoding circuit 23 Spreading circuit 101a, 101b Antenna 102a, 102b Transmission / reception changeover switch 103a, 103b Wireless reception circuit 104a, 104b Wireless transmission circuit 105a, 105b Distribution circuit 106a, 106b Combined circuit 301 First receiving section 302, 30 Despreading circuit 304 Selection / synthesis circuit 305 Comparison circuit 306 Decoding circuit 307 First transmission unit 308 Encoding circuit 309 Spreading circuit 310 Amplification / attenuation circuit 311 Antenna switching circuit 312 Second receiving unit 313 Second transmitting unit 1a, 1b Antenna 2a, 2b Transmission / reception switching circuit 3a, 3b Radio reception circuit 4a, 4b Radio transmission circuit 31 Reception unit 32, 33 Despreading circuit 34 Selection / synthesis circuit 35 Comparison circuit 36 Decoding circuit 41 Transmission unit 42 Coding circuit 43 Spreading circuit 44 antenna changeover switch 45 comparison circuit 401 first reception unit 402, 403 despreading circuit 404, 405 phase detection circuit 406, 407 phase compensation circuit 408 reception synthesis circuit 409 decoding circuit 410 first transmission unit 411 encoding circuit 412 spreading Circuit 413 Amplification / attenuation circuit 414 transmission distribution circuit 415, 416 phase adjustment circuit 417 second reception unit 418 second transmission unit 51 reception unit 52, 53 despreading circuit 54, 55 phase detection circuit 56, 57 phase compensation circuit 58 reception synthesis circuit 59 decoding circuit 61 transmitter 62 encoding circuit 63 spreading circuit 64 transmission distribution circuit 65, 66 phase adjustment circuit 67 comparison circuit

Claims (6)

[Claims] 1. A mobile communication device comprising a base station side device and a mobile station side device for performing communication using a TDD system as a bidirectional multiplexing system and a direct spread CDMA system as a multiple access system, wherein the base station side device is A means for obtaining a correlation value by despreading a received signal received by one antenna for each channel, a means for decoding each received signal based on each obtained correlation value, and a power of each obtained correlation value A means for comparing, a means for encoding a signal to be transmitted for each channel, a means for spreading each encoded transmission signal, and a spread for each transmission signal of the obtained correlation value According to the power, if the power is large, it is amplified, and if it is small, it is provided with a means for attenuating and outputting, and the mobile station side device despreads the received signal received by one antenna, and obtains a correlation value; Seeking Means for decoding the received signal based on the correlation value, means for comparing the power of the obtained correlation value, means for encoding the signal to be transmitted, means for spreading the encoded transmission signal, and spreading And a means for deciding the amplification amount of the transmitted signal to be increased in accordance with the power of the obtained correlation value so as to increase as the power decreases. 2. A mobile communication device comprising a base station side device and a mobile station side device for performing communication using a TDD system as a bidirectional multiplexing system and a direct spread CDMA system as a multiple access system, wherein the base station side device is , Means for obtaining a correlation value by despreading each received signal received by a plurality of antennas for each channel and for each antenna, means for selecting or synthesizing the obtained correlation value for each antenna, and A means for comparing the powers of the correlation values of the respective antennas to select an antenna having a large power, and a correlation value having a large power is selected from the obtained correlation values of the respective antennas, or weighted according to the power and combined. Means and means for decoding each received signal based on the selected or combined correlation value,
Means for coding a signal to be transmitted for each channel, means for spreading each coded transmission signal, and each spread transmission signal according to the power of the selected or combined correlation value If the power is large, it will be amplified,
A mobile communication device having the configuration according to claim 1, further comprising: means for attenuating and outputting if small, and means for switching the antenna so as to send a transmission signal from the selected antenna, wherein the mobile station side device has the configuration according to claim 1. . 3. The base station side device comprises the configuration according to claim 2, and the mobile station side device despreads the received signals received by a plurality of antennas for each antenna to obtain a correlation value.
A means for comparing the powers of the calculated correlation values for each antenna and selecting an antenna with a large power, and selecting a correlation value with a large power from the calculated correlation values for each antenna, or weighting according to the power Combining means, means for decoding a received signal based on the selected or combined correlation value, means for encoding a signal to be transmitted, means for spreading the encoded transmission signal, and And a means for switching the antenna so that the transmission signal is transmitted from the antenna, and a means for deciding the amplification amount of the spread transmission signal in accordance with the power of the selected or combined correlation value so that the smaller the power is, the larger the amplification amount is. A mobile communication device comprising: 4. A mobile communication device comprising a base station side device and a mobile station side device for performing communication using a TDD system as a bidirectional multiplex system and a direct spread CDMA system as a multiple access system, wherein the base station side device is , Means for obtaining a correlation value by despreading each received signal received by a plurality of antennas for each channel and for each antenna, and detecting the phase of the received wave for each antenna from the obtained correlation value for each antenna Means for correcting the phase of each correlation value, means for weighting and combining the phase-corrected correlation values according to power, and decoding of each received signal based on the combined correlation value Means, a means for encoding a signal to be transmitted for each channel, a means for spreading each encoded transmission signal, and a correlation value obtained by combining the respective spread transmission signals. If the power is large, it is amplified, if it is small, it is attenuated and output, means for distributing the amplified or attenuated transmission signal for each antenna, and the phase of the distributed transmission signal A mobile communication apparatus having a configuration according to claim 1, wherein the mobile station apparatus comprises means for adjusting the detected antenna phase. 5. A mobile communication device, wherein the base station side device has the configuration according to claim 4, and the mobile station side device has the configuration according to claim 3. 6. The base station apparatus comprises the configuration according to claim 4, and the mobile station apparatus despreads each received signal received by a plurality of antennas for each antenna to obtain a correlation value. , Means for detecting the phase of the received wave for each antenna from the obtained correlation value for each antenna and correcting the phase of each correlation value, and weighting each phase-corrected correlation value according to the power Means for decoding, a means for decoding a received signal based on the combined correlation value, a means for encoding a signal to be transmitted, a means for spreading the encoded transmission signal, and a spread transmission signal Means for distributing to each antenna, means for adjusting the phase of the distributed transmission signal by the amount of each detected antenna phase, and the synthesized correlation value of the amplification amount of the phase-adjusted transmission signal Power according to the power of And a means for deciding to increase the smaller.