JP2003060568A - Radio base apparatus, method for controlling transmitting power and transmitting power control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio base apparatus which prevents a deterioration of a receiving performance in a diversity terminal when the diversity terminal and a normal terminal are spatially multiple-connected to a base station, and to provide a method for controlling a transmitting power and a transmitting power control program. SOLUTION: The method for controlling the transmitting power comprises a step of controlling the down transmitting power of an adaptive array base station 1, so that a transmitting power to the normal terminal 3 is smaller than that to the diversity terminal 2, when the terminal 2 and the terminal 3 are spatially multiple-connected to the adaptive array base station 1 in a mobile communication system in which the terminal 2 and the terminal 3 are intermingled. Thus, possibility of selecting a whip antenna 2a used for transmitting via the terminal 2 as a receiving antenna is enhanced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a radio base unit,
TECHNICAL FIELD The present invention relates to a transmission power control method and a transmission power control program, and particularly, in a mobile communication system in which diversity terminals and normal terminals are mixed, it is possible that the diversity terminals and normal terminals maintain spatial multiplex connection with a radio base apparatus. Wireless base device, transmission power control method,
And a transmission power control program.

[0002]

2. Description of the Related Art In recent years, in mobile communication systems (for example, Personal Handyphone System: PHS) which are rapidly developing, the same time slot of the same frequency is spatially arranged in order to increase the frequency utilization efficiency of radio waves. By dividing, it is possible to spatially multiplex the wireless terminal devices (terminals) of a plurality of users to the wireless base station (base station).
A DMA (Path Division Multiple Access) method has been proposed.

In this PDMA system, the adaptive array technology is currently adopted, and the upstream signal from the antenna of each user terminal is received by the array antenna of the base station and separated by the adaptive array processing with reception directivity. To be extracted. On the other hand, a downlink signal from the base station to the terminal is transmitted from the array antenna with transmission directivity for the antenna of the terminal.

Such adaptive array processing is a well-known technique. For example, "Adaptive Signal Processing by Array Antenna" by Nobuyoshi Kikuma (Science and Technology Publication), pages 35 to 49, "Chapter 3 MMSE Adaptive Array". Since it has been described in detail, the description of its operating principle is omitted here.

In the following description, a base station that performs downlink transmission directivity control for a terminal using such an adaptive array process is referred to as an adaptive array base station.

On the other hand, as a terminal, selective diversity reception using a plurality of antennas (hereinafter, diversity reception)
It is known to do. As such a terminal, one having two antennas called a whip antenna and a chip antenna is generally incorporated, and such a terminal is hereinafter referred to as a diversity terminal. A terminal with one antenna that does not perform diversity reception is called a normal terminal.

In such a diversity terminal, one antenna (generally a whip antenna) is usually fixed as a transmitting antenna at the time of transmission, and at the time of receiving, the antenna having the higher reception level of the whip antenna and the chip antenna is used as the receiving antenna. Works to choose.

Such a conventional diversity terminal is irrespective of whether the connected base station is an adaptive array base station for controlling transmission directivity or an omnidirectional base station other than that. The diversity reception described above is executed.

FIG. 6 is a diagram schematically showing a connection state between a terminal and a base station. In particular, a diversity terminal and a normal terminal are spatially multiplexed by adaptive array processing to an adaptive array base station. It is a figure which shows a state typically.

Referring to FIG. 6, the diversity terminal 2 is
At the time of transmission, the whip antenna 2a fixed as a transmission antenna transmits an upstream signal, and the adaptive array base station 1 receives this at the array antenna 1a.

On the other hand, the normal terminal 3 transmits an upstream signal with one antenna 3a at the time of transmission, and the adaptive array base station 1 receives this with the array antenna 1a.

On the other hand, the adaptive array base station 1
From, the downlink signal for the diversity terminal 2 is transmitted with the directivity (corresponding to the transmission power level) indicated by the solid line, and the downlink signal for the normal terminal 3 is transmitted with the directivity (corresponding to the transmission power level) indicated by the broken line.

Regarding the transmission directivity with respect to the diversity terminal 2, the beam is directed to the whip antenna 2a which transmits the upstream signal of the diversity terminal 2 and the null is directed to the antenna 3a of the normal terminal 3 which is an interference source.

On the other hand, the transmission directivity for the normal terminal 3 is
The beam is normally directed to the antenna 3a that has transmitted the upstream signal of the terminal 3, and the null is directed to the whip antenna 2a of the diversity terminal 2 which is an interference source.

As a result, the signal received by the antenna 3a of the normal terminal 3 is transmitted from the adaptive array base station 1 to the diversity terminal 2 with respect to the downlink signal level (broken line) from the adaptive array base station 1 to the normal terminal 3. A signal whose downlink signal level (solid line) is relatively small and whose interference component is small, so-called DU (Desired user's power: Und)
esired user's power) signal is high.

Further, the signal received by the whip antenna 2a of the diversity terminal 2 is transmitted from the adaptive array base station 1 to the diversity terminal 2 (solid line), and from the adaptive array base station 1 to the normal terminal 3. The downlink signal level (broken line) is relatively low, and this is also a signal with a high DU ratio.

[0017]

As described above, in the diversity terminal, the whip antenna is fixed as the transmission antenna at the time of transmission, and at the time of reception, the antenna having the higher reception level of the whip antenna and the chip antenna is the reception antenna. Works as you choose.

Here, paying attention to the chip antenna 2b of the diversity terminal 2, this antenna is not used for transmitting the upstream signal, and the null of the transmission directivity (broken line) to the normal terminal 3 is not aimed.

Therefore, the chip antenna 2b of the diversity terminal 2 receives not only the transmission power for the diversity terminal 2 (solid line) but also the transmission power for the normal terminal 3 (broken line), and the chip antenna 2b.
There is a possibility that the reception level in the above will exceed the reception level in the whip antenna 2a and the chip antenna 2b will be selected as the receiving antenna.

If the chip antenna 2b is selected as the receiving antenna, the downlink signal level from the adaptive array base station 1 to the diversity terminal 2 (solid line).
To the normal terminal 3 from the adaptive array base station 1.
The downlink signal level (dashed line) relative to is relatively large, and the signal has a low DU ratio with a large interference component.

In the diversity terminal 2, such D
Even if an attempt is made to demodulate a received signal having a low U ratio, an error occurs in the frame of the demodulated signal and accurate demodulation cannot be performed.

As described above, in the conventional mobile communication system in which the diversity terminal and the normal terminal are mixed, when the diversity terminal and the normal terminal are spatially multiplex-connected to the adaptive array base station, D in the diversity terminal is used.
The U ratio is lowered and the reception performance is deteriorated by the interference wave. As a result, there is a problem that the diversity terminal cannot maintain the spatial multiplex connection.

Therefore, an object of the present invention is to maintain spatial multiplex connection in a mobile communication system in which a diversity terminal and a normal terminal are spatially multiplex-connected to a base station without degrading the reception performance of the diversity terminal. It is to provide a wireless base device, a transmission power control method, and a transmission power control program that can be performed.

[0024]

One aspect of the present invention is a radio base station in a mobile communication system, the mobile communication system performing diversity reception capable of spatial multiplex connection to the radio base station. It includes a diversity terminal device and a normal terminal device that does not perform diversity reception. The wireless base device includes a terminal type determination unit and a transmission power control unit. The terminal type determination means determines whether the terminal device connected to the wireless base device is a diversity terminal device or a normal terminal device. The transmission power control means, according to the determination result by the terminal type determination means,
The transmission power is controlled so that the transmission power for the normal terminal device is smaller than the transmission power for the diversity terminal device.

[0025] Preferably, the terminal type determination device has a means for evaluating the downlink signal reception performance of the terminal device connected to the radio base device and the quality of the uplink signal from the terminal device, and the downlink signal reception performance is low. And means for judging the terminal device as a diversity terminal device when the quality of the upstream signal is evaluated as good, and for judging as a normal terminal device otherwise.

Preferably, the transmission power control means includes means for increasing the transmission power to the terminal device when it is determined that the terminal device connected to the radio base device is the diversity terminal device.

Another aspect of the present invention is a transmission power control method for a radio base apparatus in a mobile communication system,
The mobile communication system includes a diversity terminal device capable of performing spatial multiplexing connection with a radio base device and performing diversity reception, and a normal terminal device not performing diversity reception. Transmission power control method, a step of determining whether the terminal device connected to the wireless base device is a diversity terminal device or a normal terminal device, depending on the result of the determination, than the transmission power for the diversity terminal device And controlling the transmission power so that the transmission power to the normal terminal device becomes small.

[0028] Preferably, the determining step includes a step of evaluating the downlink signal reception performance of the terminal device connected to the radio base apparatus and the quality of the uplink signal from the terminal device, and the downlink signal reception performance is low. Determining that the terminal device is a diversity terminal device when the quality of the upstream signal is evaluated to be good, and determining that the terminal device is a normal terminal device otherwise.

Preferably, the step of controlling the transmission power includes the step of increasing the transmission power for the terminal device when it is determined that the terminal device connected to the radio base device is the diversity terminal device.

Yet another aspect of the present invention is a transmission power control program for a radio base station in a mobile communication system, wherein the mobile communication system performs diversity reception capable of spatial multiplex connection to the radio base station. It includes a diversity terminal device and a normal terminal device that does not perform diversity reception. The transmission power control program causes the computer to determine whether the terminal device connected to the wireless base device is a diversity terminal device or a normal terminal device, and transmits to the diversity terminal device according to the result of the determination. And a step of controlling the transmission power so that the transmission power for the normal terminal device is smaller than the power.

Preferably, the determining step includes the steps of evaluating the downlink signal reception performance of the terminal device connected to the radio base apparatus and the quality of the uplink signal from the terminal device, and determining that the downlink signal reception performance is low. Determining that the terminal device is a diversity terminal device when the quality of the upstream signal is evaluated to be good, and determining that the terminal device is a normal terminal device otherwise.

Preferably, the step of controlling the transmission power includes the step of increasing the transmission power to the terminal device when it is determined that the terminal device connected to the radio base device is the diversity terminal device.

According to the present invention, when the diversity terminal device and the normal terminal device are spatially multiplex-connected to the radio base device, the transmission power for the normal terminal becomes smaller than the transmission power for the diversity terminal device. It controls downlink transmission power. As a result, it is possible to increase the possibility that the transmitting antenna of the diversity terminal device will be selected as the receiving antenna, and prevent deterioration of the receiving performance of the diversity terminal.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated.

FIG. 1 is a conceptual diagram schematically showing the principle of the transmission power control of the present invention. More specifically, similar to FIG. 6 described above, a diversity terminal and a normal terminal are provided for an adaptive array base station. The state where the terminal is spatially multiplex-connected by the adaptive array processing is schematically shown.

The spatial multiple access state shown in FIG. 1 differs from the state shown in FIG. 6 in the following points. That is, in the spatial multiplex connection state shown in FIG. 1, compared to the downlink transmission power level (solid line) for the diversity terminal 2,
The transmission power control is performed in the adaptive array base station 1 so that the downlink transmission power level (broken line) for the normal terminal 3 becomes relatively small.

In this way, the overall reception level at the chip antenna 2b of the diversity terminal 2 is reduced by the amount that the downlink transmission power for the normal terminal 3 is reduced. On the other hand, with respect to the whip antenna 2a of the diversity terminal 2, since the directivity (broken line) for the normal terminal 3 is originally directed toward null, the whip antenna 2a
The reception level in is the same as in the case of FIG.

Therefore, if the transmission power is controlled as shown in FIG. 1, the reception level of the chip antenna 2b is lowered as a whole, and the whip antenna 2a is more likely to be selected as the reception antenna.

On the other hand, compared with the case of FIG.
Since the downlink transmission power level (dashed line) becomes smaller, the reception level at the antenna 3a decreases. However, since the transmission directivity (solid line) for the diversity terminal 2 is originally still pointing to the null for the normal terminal 3, the reception signal at the antenna 3a of the normal terminal 3 can secure a constant DU ratio. The reception performance of the terminal 3 is not substantially affected.

As described above, according to the transmission power control of the present invention, the downlink transmission power is controlled so that the transmission power for the normal terminal becomes smaller than the transmission power for the diversity terminal, so that when the diversity terminal receives. In the diversity terminal, the possibility of selecting the whip antenna is increased, and thereby, the deterioration of the reception performance due to the selection of the chip antenna as the reception antenna in the diversity terminal is attempted.

Further, the present invention intends to maintain the spatial multiplex connection to the adaptive array base station of both the diversity terminal and the normal terminal by minimizing the influence of the transmission power reduction on the normal terminal.

FIG. 2 is a schematic block diagram showing a structure of adaptive array base station 1000 according to the embodiment of the present invention for performing the transmission power control described with reference to FIG.

Referring to FIG. 2, adaptive array base station 1000 has a plurality of antennas, such as antenna 1.
An array antenna consisting of 1 and 12 is provided.

The antennas 11 and 12 are connected to the radio units 21 and 22, respectively. The wireless units 21 and 22 have exactly the same configuration, and only the configuration of the wireless unit 21 will be shown and described.

The radio section 21 includes a switch 110, a transmission section 111, a reception section 112, a D / A converter 113, and an A / D converter 113.
/ D converter 114.

At the time of reception, the switch 110 is switched so that the signal received by the antenna 11 is given to the receiving section 112. The received signal given to the receiving unit 112 is subjected to various kinds of analog signal processing such as amplification and frequency conversion, converted into a digital signal by the A / D converter 114, and given to the user signal processing unit 50. .

The user signal processing section 50 separates and extracts the signals of each user by the adaptive array processing described later. The separated and extracted received signals of each user are processed by the normal modem unit 60 and the baseband processing and TDMA / TD.
The D signal is supplied to the D processing unit 70 and subjected to necessary demodulation processing and time division processing, restored to the original signal and supplied to the public line network 90.

On the other hand, at the time of transmission, the transmission signal given from the public line network 90 is subjected to baseband processing and TDMA.
/ TDD processing section 70 and modem section 60 are provided with the necessary time division processing and modulation processing, and then provided to user signal processing section 50.

In the user signal processing unit 50, the downlink transmission directivity is controlled as will be described later, and the D / of the radio unit 21 is controlled.
The A converter 113 converts the analog signal.

The transmission signal converted into an analog signal is subjected to various kinds of analog signal processing necessary for wireless transmission such as amplification and frequency conversion in the transmission section 111.

At the time of transmission, the switch 110 has the transmitting unit 1
The transmission signal is switched to connect the antenna 11 and the antenna 11, and the transmission signal radio-processed by the transmission unit 111 is transmitted from the antenna 11.

Similar processing is executed via the wireless unit 22. In addition, the adaptive array base station 1000 of FIG.
Includes a control unit (diversity terminal determination unit) 80, which is a characteristic part of the present invention, and determines the type of terminal based on information from the modem unit 60 and the baseband processing and TDMA / TDD processing unit 70. The result is given to the user signal processing unit 50. The operation of the control unit 80 will be described later.

The processing of the user signal processing section 50 and the control section 80 shown in FIG. 2 is actually realized by software using a digital signal processor (DSP).

FIG. 3 shows the user signal processing unit 5 shown in FIG.
It is a functional block diagram which shows the structure of 0. The user signal processing unit 50 includes a user A signal processing unit 50a, a user B signal processing unit B, and a transmission power control device 50c.

User A signal processor 50a and user B
The signal processing unit 50b has exactly the same configuration, and only the configuration of the user A signal processing unit 50a will be shown and described.

A radio section 21 corresponding to the antenna 11 of FIG.
Of the digital signal received from the receiver 112 of the wireless communication unit 112 via the A / D converter 114 and the digital signal received from the receiver of the radio unit 22 corresponding to the antenna 12 via the A / D converter not illustrated. Received signal is user A
It is commonly given to the signal processing unit 50a and the user B signal processing unit 50b.

The processing of these digital signals supplied to the user A signal processing section 50a will be described below.
These signals supplied to the user A signal processing unit 50a are adaptively software-processed by a DSP (not shown) of the base station 1000 according to the functional block diagram shown in FIG.

Referring to FIG. 3, the received signal vector consisting of the two systems of digital received signals given from the radio units 21 and 22 to the user A signal processing unit 50a is the multiplier MR1,
It is given to each one input of MR2, and is given to the reception weight vector calculator 52a.

The reception weight vector calculator 52a calculates a weight vector composed of weights for each antenna by an adaptive array algorithm described later,
Apply to the other input of each of the multipliers MR1 and MR2,
Complex multiplication is performed with the received signal vector from the corresponding antenna. The adder AD1 obtains an array output signal which is the sum of the complex multiplication results.

The array output signal, which is the result of the complex multiplication sum as described above, is demodulated into bit data and error-determined by the demodulation and error-determination unit 51a.
The separated and extracted received signal from the user A is supplied to the modem unit 60 of FIG. Similarly, the user B signal processing unit 50 b supplies the separated and extracted received signal from the user B to the modem unit 60.

In the reception weight vector calculator 52a,
RLS (Recursive Least Squares) algorithm and S
An adaptive array algorithm such as MI (Sample Matrix Inversion) algorithm is used.

Such RLS algorithm and SMI algorithm are well known techniques in the field of adaptive array processing, and as described above, they are described in No. 5 Kikuma's "Adaptive Signal Processing by Array Antenna" (Science and Technology Publication). Three
Since the details are described in "Chapter 3 MMSE Adaptive Array" on pages 5 to 49, the description thereof is omitted here.

On the other hand, the transmission signal from the modem section 60 of FIG. 2 is modulated by the transmission signal modulation section 53a, and the multiplier M
The receiving weight vector calculated by the receiving weight vector calculator 52a is applied to one input terminal of each of T1 and MT2, and the other receiving terminal of each of the multipliers MT1 and MT2 is copied by the transmitting weight vector calculator 54a and transmitted. It is applied as a weight vector.

As described above, the two systems of digital transmission signals weighted by complex multiplication with the transmission weight vector in each of the user A signal processing section 50a and the user B signal processing section 50b are transmitted via the transmission power control apparatus 50c. They are combined and given to the radio units 21 and 22, respectively.

The digital transmission signals given to the radio units 21 and 22 are transmitted via the antennas 11 and 12, respectively.

The signals transmitted through the same antennas 11 and 12 as at the time of reception are weighted by weight vectors targeting a specific terminal as in the case of the received signals, and therefore are transmitted from these antennas. The radio signal will be transmitted with transmission directivity targeting this specific terminal.

It should be noted that the transmission power control device 50c is shown in FIG.
From the control unit 80, the diversity terminal information regarding the terminal type is given.

Next, FIG. 4 shows the DSP of the adaptive array base station 1000 (corresponding to the user signal processing unit 50 and the control unit 80 of FIG. 2) in order to realize the power control method of the present invention shown in FIG. It is a flowchart which shows the operation | movement performed by.

Referring to FIG. 4, it is assumed that a plurality of users (for example, user A and user B) are spatially multiplex-connected to the adaptive array base station.

First, a signal is transmitted from the base station (step S1), and signals from users A and B are received. Then, it is determined whether the terminal of the user A is a diversity terminal by the terminal type determination method described later (step S2).

As a result, when it is determined that the terminal of the user A is the diversity terminal, a signal is given to the transmission power control apparatus 50c of FIG. 3 to instruct to increase the transmission power to the terminal of the user A. . As a result, the transmission power for the other terminal (user B) connected to the base station becomes relatively small.

On the other hand, if it is determined in step S2 that the terminal of the user A is not the diversity terminal, the transmission power for the user A is not changed and the process proceeds to step S4 to determine whether the terminal of the user B is the diversity terminal. To determine.

As a result, when it is determined that the user B is a diversity terminal, the transmission power control apparatus 50c of FIG. 3 increases the transmission power to the terminal of the user B.
To give an instruction (step S5). As a result,
The transmission power for the other terminal (user A) connected to the base station is relatively small.

On the other hand, when it is determined in step S4 that the terminal of the user B is not the diversity terminal, the transmission power for the user B is not changed, and the transmission power is not controlled after all (step S6).

As a result, since the control for increasing the transmission power is executed only for the terminal which is determined to be the diversity terminal, the transmission power for the normal terminal is relatively lowered and the diversity terminal is used for the transmission. The whip antenna is more likely to be selected as the receiving antenna, and the deterioration of the receiving performance of the diversity terminal can be prevented.

As described above, the following methods can be considered as a method for determining whether the terminal connected to the base station is a diversity terminal or a normal terminal. That is, since the diversity terminal transmits using a fixed antenna (whipped antenna) at the time of transmission, the quality of the uplink received signal at the base station is generally good.

However, if the chip antenna which is not the transmitting antenna is selected as the receiving antenna by the selective diversity reception, the receiving performance of the diversity terminal is remarkably lowered due to the above-mentioned reason.

As a result, in the diversity terminal, when the reception error of the downlink signal increases and exceeds a certain amount, the terminal
Request the base station to change the call channel.
This operation is generally called a terminal activation interference avoiding operation.

Therefore, when such a terminal activation interference avoiding operation occurs even though the quality of the upstream signal from the terminal is good, it is estimated that the reception is performed by the antenna different from that at the time of transmission, and the terminal concerned is It is determined that the terminal is a diversity terminal.

FIG. 5 is a flow chart showing details of the terminal type determination operation (steps S2 and 4 in FIG. 4) based on such determination criteria. The operation shown in FIG. 5 is also executed by software in the DSP (corresponding to the control unit 80 in FIG. 2) of the base station.

First, the terminal makes a request for avoiding interference caused by terminal activation, and deterioration of downlink signal reception at the terminal is estimated (step S11).

Next, based on the information from the modem unit 60 and the baseband processing / TDMA / TDD processing unit 70, whether there is an error in the upstream signal from the terminal (step S12), the received power of the upstream signal at the base station is determined. Is low (step S13).

As a result, if there is no uplink error and the received power is not low, even if there is a terminal activation interference avoidance request, that is, if it is determined that the quality of the received signal is good, the terminal receives diversity. Determine that it is a terminal,
An ID number (PSID) for identifying the terminal (PS) is stored in a memory (not shown) (step S14).

On the other hand, an upstream error is detected (step S1
2) or when a decrease in upstream power is detected (step S13), both the upstream signal and the downstream signal have deteriorated, and the terminal is determined to be a normal terminal that does not perform diversity reception (step S15).

As described above, the terminal type can be indirectly determined from the deterioration of the upstream and downstream signals, but the transmission power control according to the present invention is limited to such a terminal type determination method. is not. For example, the terminal type may be determined by exchanging some information (flag) that specifies the terminal type.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[0087]

As described above, according to the present invention, by controlling the downlink transmission power so that the transmission power for the normal terminal becomes smaller than the transmission power for the diversity terminal, it is used during the transmission of the diversity terminal. Increase the likelihood that the antenna will be selected as the receiving antenna,
As a result, it is possible to prevent deterioration of reception performance in diversity terminals and to maintain the spatial multiplex connection to adaptive array base stations of both diversity terminals and normal terminals by minimizing the effect of transmission power reduction on normal terminals. can do.

[Brief description of drawings]

FIG. 1 is a conceptual diagram schematically showing the principle of transmission power control of the present invention.

FIG. 2 is a schematic block diagram showing a configuration of an adaptive array base station according to the embodiment of the present invention.

FIG. 3 is a functional block diagram showing a configuration of a user signal processing section 50 shown in FIG.

FIG. 4 is a flowchart showing a power control method according to the embodiment of the present invention.

FIG. 5 is a flowchart showing a terminal type determination method according to the embodiment of the present invention.

FIG. 6 is a conceptual diagram schematically showing downlink transmission directivity of an adaptive array base station for diversity terminals and normal terminals.

[Explanation of symbols]

1 adaptive array base station, 1a array antenna, 2 diversity terminals, 2a whip antenna,
2b chip antenna, 3 normal terminal, 3a antenna, 11,12 antenna, 21,22 radio unit, 50
User signal processing unit, 50a User A signal processing unit, 5a
0b User B signal processing unit, 50c Transmission power control device, 51a Demodulation and error determination unit, 52a Reception weight vector calculator, 53a Transmission signal modulation unit, 54
a Transmit weight vector calculator, 60 modem section, 70
Baseband processing and TDMA / TDD processing unit, 8
0 control unit (diversity terminal determination unit), 90 public line network, 110 switch, 111 transmission unit, 112 reception unit, 113 D / A converter, 114 A / D converter,
1000 Adaptive Array Base Station, MR1, MR
2, MT1, MT2 multiplier, AD1 adder.

Claims (9)

[Claims] 1. A radio base station in a mobile communication system, wherein the mobile communication system is capable of performing spatial multiplex connection to the radio base station, diversity terminal for performing diversity reception, and normal non-diversity reception. Including a terminal device, the wireless base device, the terminal type determination unit for determining whether the terminal device connected to the wireless base device is a diversity terminal device or a normal terminal device, by the terminal type determination unit A radio base apparatus comprising: a transmission power control unit that controls the transmission power so that the transmission power for the normal terminal apparatus becomes smaller than the transmission power for the diversity terminal apparatus according to the determination result. 2. The terminal type determination device evaluates downlink signal reception performance and uplink signal quality from the terminal device connected to the radio base device, and reception of the downlink signal. A means for determining the terminal device as a diversity terminal device when it is evaluated that the performance is low and the quality of the upstream signal is good, and a device for determining the terminal device as a normal terminal device in other cases, comprising: The wireless base device described. 3. The transmission power control means includes means for increasing transmission power to the terminal device when it is determined that the terminal device connected to the radio base device is a diversity terminal device. 1 or 2
The radio base unit according to. 4. A transmission power control method for a radio base apparatus in a mobile communication system, wherein the mobile communication system is capable of performing spatial multiplex connection with the radio base apparatus, the diversity terminal apparatus performing diversity reception and the diversity terminal apparatus. Including a normal terminal device that does not receive, the transmission power control method, a step of determining whether the terminal device connected to the radio base device is a diversity terminal device or a normal terminal device, of the determination Depending on the result, a step of controlling the transmission power so that the transmission power for the normal terminal device is smaller than the transmission power for the diversity terminal device,
Transmission power control method. 5. The determining step comprises a step of evaluating downlink signal reception performance in a terminal device connected to the radio base apparatus and a quality of an uplink signal from the terminal device, and the downlink signal reception performance. Is low and the quality of the upstream signal is evaluated to be good, the terminal device is determined to be a diversity terminal device, and a step of determining to be a normal terminal device otherwise. Transmission power control method. 6. The step of controlling the transmission power includes the step of increasing the transmission power to the terminal device when the terminal device connected to the radio base device is determined to be a diversity terminal device, The transmission power control method according to claim 4 or 5. 7. A transmission power control program for a radio base apparatus in a mobile communication system, wherein the mobile communication system is capable of performing spatial multiplex connection to the radio base apparatus, the diversity terminal apparatus performing diversity reception, and the diversity terminal apparatus. Including a normal terminal device that does not receive, the transmission power control program, the computer, a step of determining whether the terminal device connected to the wireless base device is a diversity terminal device or a normal terminal device, And a step of controlling the transmission power so that the transmission power for the normal terminal device becomes smaller than the transmission power for the diversity terminal device according to the result of the determination. 8. The determining step includes a step of evaluating downlink signal reception performance in a terminal device connected to the radio base apparatus and a quality of an uplink signal from the terminal device, and the downlink signal reception performance. Is low and the quality of the upstream signal is evaluated to be good, the terminal device is determined to be a diversity terminal device, and a step of determining to be a normal terminal device otherwise. Transmission power control program. 9. The step of controlling the transmission power includes the step of increasing the transmission power to the terminal device when it is determined that the terminal device connected to the radio base device is a diversity terminal device, The transmission power control program according to claim 7.