JPH11266199A - Radio communication base station device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finely control the transmission power value for each user, each time slot and each symbol respectively and to increase the number of acceptable subscribers by transmitting the set value of transmission power to a radio means, in addition to the transmission data. SOLUTION: A base-band processing part 104 sets the transmission power value on a down communication bus 106 in addition to the transmission data, and a radio part 103 controls the transmission power for each transmission data. Since the part 103 which performs the transmission with the actually designated transmission power is different from the part 104 which assembles a radio frame of the transmission data, a control part 101 must set the transmission power value at the part 103 and the transmission data at the part 104 via a control bus 108 respectively. Thereby, the transmission power value is set for each transmission data using the bus 106, which connects both parts 103 and 104 together. Thus, the transmission data and its set value of transmission power are supplied in a single unit and for each control of the transmission power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radio communication base station apparatus accommodating a plurality of users, and more particularly to a radio communication base station apparatus applicable to a CDMA system.

[0002]

2. Description of the Related Art Conventional PDC (Personal Di)
In the case of a digital cellular system, transmission power control in mobile radio communication is performed in units of radio frames or in units of radio time slots. In particular, for the common control channel, since the same radio frame is used by a plurality of users, it is necessary to transmit the radio frame at a transmission power value that can be received by all users. This will be described with reference to FIG.

FIG. 3 is a diagram showing a frame configuration of a common control channel. In the common control channel, since one radio frame is used by a plurality of users, transmission has been conventionally performed at a transmission power value that can be received by all users. For example,
As shown in FIG. 3A, when a radio frame is used by up to four users, four radio time slots of one radio frame divided into 16 radio time slots are allocated to each user and used. At this time, the transmission power value of each user was all transmitted at the maximum power value so that all users could receive.

[0004] On the other hand, there has been a remarkable spread of mobile communication mainly in automobiles and mobile phones in recent years, and the number of subscribers has been rapidly increasing. On the other hand, since the radio frequencies that can be used for communication are finite, it is urgently necessary to increase the number of accommodated users by increasing the frequency utilization efficiency. One of the effective means is CDMA (Code Division).
on Multiple Access) systems have been proposed.

[0005]

In the CDMA system, users of different types of spreading codes are spread on the same frequency. For each user, their signal is the desired signal,
Another user's signal is an interference wave. In the CDMA system, in order to increase the number of accommodated users, it is important to transmit and receive at an optimal power value for the user and not to transmit unnecessary signals over the radio.

In the CDMA system, in order to determine a transmission power value for each user, it is necessary to determine an optimum transmission power value according to a signal received from a mobile station device.

However, in the CDMA system, the transmission power value cannot be obtained without despreading. Therefore, it is necessary to determine the transmission power value according to the signal received from the mobile station device after the baseband processing. . On the other hand, at the time of transmission, since the transmission power value needs to be determined for each received data, the radio unit needs to determine the transmission power according to the transmission power value after performing baseband processing. For this reason, the means for determining the downlink transmission power value for each signal needs to be different from the means for actually performing transmission in accordance with the transmission power value. Was difficult to change.

Further, when transmitting a downlink signal to each mobile station apparatus, it is necessary to instruct both the baseband processing section for performing baseband processing and the radio section for performing modulation to start transmission. It is necessary to control the setting of the communication bus between the wireless communication unit and the wireless unit in accordance with the timing of the start of transmission. This is because even if the control bus is the same, if the transmission is not performed at the same time with the transmission start timing due to the difference in the processing time between the baseband processing unit and the radio unit to be controlled and the traffic of the control bus, etc. This is because transmission of invalid data may occur.

Further, since the processing time of each functional block and the traffic of the control bus change every moment, it is very difficult to control the timing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and performs optimal transmission power control for each user and increases the number of subscribers that can accommodate unnecessary radio wave output. It is an object of the present invention to provide a wireless communication base station apparatus capable of performing the above.

[0011]

According to the present invention, in order to increase the number of accommodated users in a radio communication base station apparatus, it is necessary to transmit and receive at an optimum transmission power value for each transmission data. Focusing on transmitting the baseband-processed signal to the radio unit, transmitting the transmission power value together with the transmission data, and controlling the transmission power value to always be the optimum value for each transmission data, so that accommodation is possible. It has been found that the number of users can be increased, and the present invention has been made.

That is, according to the present invention, transmission data and its transmission power set value are given as one unit in transmission power control units to radio means for performing transmission power control of transmission data based on the transmission power set value. There is a feature.

Further, at the start of transmission of a downlink signal to the mobile station apparatus, after the radio means starts transmission operation at transmission power 0,
It is characterized in that the baseband processing means controls the transmission data and its transmission power set value to be transmitted to the wireless means.

By taking such means, the present inventor solves the above-mentioned problem, sets a user in units of radio time slots, and further sets a symbol, and sets a transmission power value for each unit. Made it possible.

[0015]

According to a first aspect of the present invention, there is provided a radio communication base station apparatus for controlling transmission power of transmission data based on a transmission power setting value, and transmitting and transmitting the transmission data in transmission power control units. And a data processing means for setting the power set value as one unit and providing the data to the wireless means. The transmission power control method for a wireless communication base station apparatus according to claim 9 is a method for controlling transmission power of transmission data based on a transmission power set value. A configuration is adopted in which the transmission power setting value is given as one unit.

According to these configurations, the transmission power set value can be transmitted to the radio means together with the transmission data, so that the transmission power value can be finely controlled on a user basis, on a time slot basis, and even on a symbol basis. Thus, the number of subscribers that can be accommodated can be increased.

According to a second aspect of the present invention, there is provided a wireless communication base station apparatus for performing baseband processing on transmission data, and converting the baseband processed transmission signal into an RF signal by orthogonal transform. A configuration is provided that includes wireless means for converting, and a communication bus for transmitting transmission data and its transmission power set value from the baseband processing means to the wireless means. According to a tenth aspect of the present invention, there is provided a transmission power control method for a radio communication base station apparatus, comprising: a baseband processing means for performing baseband processing on transmission data; A configuration is employed in which transmission data and its transmission power value are transmitted using a communication bus that connects the wireless means for conversion.

With these configurations, the transmission power set value can be transmitted together with the transmission data using the communication bus connecting the baseband processing means and the wireless means.
The transmission power value can be finely controlled on a user basis, on a time slot basis, or even on a symbol basis, and the number of subscribers that can be accommodated can be increased. Further, since it is not necessary to make a significant change to the existing circuit configuration, it is possible to reduce the cost.

According to a third aspect of the present invention, in the wireless communication base station apparatus according to the second aspect, transmission data is set in predetermined bits of the communication bus, and transmission power values are set in other predetermined bits. It adopts the configuration that is performed.

According to this configuration, since it is sufficient to recognize the physically allocated bits, the transmission power can be easily controlled by transmitting the transmission data and the transmission power set value.

According to a fourth aspect of the present invention, in the wireless communication base station apparatus according to any one of the first to third aspects, the transmission power value is set for each user.

According to this configuration, the transmission power value can be finely controlled on a user basis, so that a desired wave of one user is unlikely to be an interference wave of another user, so that the reception sensitivity is improved and the number of users that can be accommodated is reduced. Increase can be achieved.

According to a fifth aspect of the present invention, in the wireless communication base station apparatus according to any one of the first to third aspects, the transmission power value is set in units of time slots. The invention according to claim 6 is the same as the claim 1.
In the wireless communication base station apparatus according to any one of claims 3 to 3, a configuration is adopted in which a transmission power value is set in symbol units.

With these configurations, since the transmission power value can be finely controlled in units of time slots and symbols, interference of each cell can be suppressed, the reception sensitivity can be improved, and the number of subscribers that can be accommodated can be reduced. Increase can be achieved.

According to a seventh aspect of the present invention, in the wireless communication base station apparatus according to any one of the second to sixth aspects, after the wireless means starts a transmission operation at a transmission power of 0, The baseband processing means includes a control means for controlling transmission data and its transmission power set value to the wireless means. Claim 1
According to a first aspect of the present invention, in the wireless communication base station apparatus according to the tenth aspect, after the wireless unit starts a transmission operation at a transmission power of 0, the baseband processing unit transmits transmission data and a transmission power set value thereof. A configuration for controlling transmission to the wireless means is adopted.

With these configurations, it is possible to match the operation timings of the wireless means and the baseband processing means when transmitting valid data. The situation of transmission can be prevented, and the number of subscribers that can be accommodated can be increased.

Further, the invention of the communication system according to claim 8 is as follows.
A wireless communication base station device according to any one of claims 1 to 7, and a mobile station device that communicates with the wireless communication base station device.

With this configuration, the transmission power value can be finely controlled on a user basis, on a time slot basis, and even on a symbol basis, so that the number of subscribers that can be accommodated can be increased.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a block diagram showing an overall configuration of a wireless communication base station device according to an embodiment of the present invention and a communication system to which the wireless communication base station device is applied.

A communication system to which the radio communication base station according to one embodiment of the present invention is applied is composed of a radio communication base station 100, a radio communication mobile station 200, and an exchange control station 300. You.

The radio communication base station apparatus 100 includes a control section 101 for controlling the entire radio communication base station apparatus, a transmission / reception amplification section 102 for amplifying a transmission radio signal and amplifying a reception radio signal, and a baseband-processed signal. A radio unit 103 performs D / A conversion of a downlink transmission signal, converts the signal into an RF signal by quadrature modulation, and A / D converts an uplink reception signal and transmits the signal to a baseband processing unit.

The baseband processing unit 104 performs error correction coding, framing and spreading coding of transmission data, code despreading of received signals, synchronization processing, error correction coding, and demultiplexing of data. And a wired transmission line interface unit 105 for interfacing with the transmission line.

The transmission / reception amplification unit 102 and the radio unit 103
The baseband processing unit 104 has a configuration that does not depend on the sector. The wireless unit 103 and the baseband processing unit 104 are connected by a communication bus 106,
The baseband processing unit 104 and the wired transmission line interface unit 105 are connected by a communication bus 107.

Further, a radio unit 103, a baseband processing unit 104, a transmission line interface unit 105, and a control unit 101
Are connected by the control bus 108 and the control unit 101
Is transmitted using the control bus 108, thereby achieving overall control of the wireless communication base station apparatus 100. The wireless communication base station device 100 and the wireless communication mobile station device have antennas 109 and 201, respectively.

In the case of a common physical channel, data transmitted and received between the radio communication base station apparatus 100 and the radio communication mobile station apparatus 200 is transmitted and received between the radio communication base station apparatus 100 and the radio communication mobile station apparatus 200. You. In the case of a dedicated physical channel, transmission and reception are performed between the wireless communication mobile station device 200, the wireless communication base station device 200, and the switching control station 300.

When the uplink signal of the common physical channel is transmitted from radio communication mobile station apparatus 200, it is received by antenna 109 of radio communication base station apparatus 100, amplified by transmission / reception amplification section 102, and demodulated by radio section 103. You. Next, the demodulated signal is transmitted to the baseband processing unit 104 via the communication bus 106. The baseband processing unit 104 performs despreading and error correction decoding, and
8 to the control unit 101.

On the other hand, the downlink signal of the common physical channel is transmitted from the control unit 101 to the baseband processing unit 104 via the control bus 108, and the baseband processing unit 104 performs error correction coding and assembling of radio frames. Is transmitted to the wireless unit 103 via the communication bus 106. This is modulated by the radio unit 13 and amplified by the transmission / reception amplification unit 12, and then transmitted from the antenna 109 to the radio communication mobile station device 200.

On the other hand, when the uplink signal of the dedicated physical channel is transmitted from radio communication mobile station apparatus 200, it is received by antenna 109 of radio communication base station apparatus 100, amplified by transmission / reception amplification section 102, and transmitted by radio section 13. Demodulated. The demodulated signal is despread and error-corrected decoded by the baseband processing unit 104 via the communication bus 106, and transmitted from the transmission line interface unit 105 to the switching control station 300 via the communication bus 107.

The downlink signal of the dedicated physical channel is error-correction-coded or converted into a radio frame in the baseband processing unit 104 from the switching control station 300 via the transmission line, from the transmission line interface unit 105 via the communication bus 107. . Next, the signal is modulated by the wireless unit 103 via the communication bus 106,
The signal is amplified by the transmission / reception amplification unit 102 and transmitted from the antenna 109 to the wireless communication mobile station device 200.

At the time of transmission to the mobile station 200,
The baseband processing unit 104 outputs the transmission data and the transmission power value assembled into the radio frame to the communication bus 106, and the radio unit 103 extracts the communication data and the transmission power value from the communication bus 106, and according to the extracted transmission power value. By transmitting the transmission data to the transmission / reception amplification unit 102, downlink transmission power control is realized.

Next, the downstream communication bus 106 will be described with reference to FIG. FIG. 2 is a diagram showing a state of a time slot of the communication bus 106. As shown in FIG. 2, the downstream communication bus 106 is a time division multiplex bus,
It is divided into 12 time slots. One time slot is configured such that communication data of one symbol and a transmission power value corresponding to the symbol can be set.

Next, the transmission power control of the common physical channel will be described with reference to FIGS. In the common control channel, since one radio frame is used by a plurality of users, conventionally, transmission is performed at a transmission power value that can be received by all users. For example, as shown in FIG.
Conventionally, when a radio frame is used by up to four users,
Four radio time slots of one radio frame divided into 16 radio time slots are used by allocating them to each user, and the transmission power value of each user at that time is set so that all users can receive. It was transmitting at the maximum power value.

However, in order to take advantage of the features of the CDMA system, it is necessary to transmit at an optimum transmission power value for each user. Therefore, the baseband processing unit 104 measures the reception SIR value of the reception data of the uplink common control channel from the wireless communication mobile station device 200, and the control unit 101 receives the data together with the reception data via the control bus 108, and The control unit 101 determines the transmission power value of the channel based on a predetermined determination method.

For example, the control unit 101 determines the optimal transmission power value of the downlink common physical channel for each radio communication mobile station device according to the distance from the radio communication mobile station device 200 and the propagation path. The transmission power value determined by control section 101 is set in baseband processing section 104 together with the transmission data.

The baseband processing unit 104 sets the transmission power value together with the transmission data in the downlink communication bus 106, and the radio unit 103 controls the transmission power for each transmission data. Since the radio unit 103 that performs transmission with the actually specified transmission power is different from the baseband processing unit 104 that performs radio frame assembly of transmission data, the control unit 101 transmits the transmission power value to the radio unit 103 and transmits the transmission data to the radio unit 103. It is necessary to set each of the baseband units 104 using the control bus 108.

Therefore, the communication bus 106 connecting the radio section 103 and the baseband processing section 104 is configured as shown in FIG. 2 so that the transmission power value is set for each transmission data. Accordingly, the wireless unit 103 and the baseband processing unit 104 do not store the association between the transmission data and the transmission power value, and when the baseband processing unit 104 outputs data to the communication bus 106, the actual wireless frame The transmission data can be output to the communication bus 106 in consideration of the transmission power, and as shown in FIG. 3B, the transmission data can be transmitted at the optimum transmission power value for each user.

At this time, since the transmission power value is output to the communication bus 106 together with the transmission data, the baseband processing unit 104 can transmit the transmission data at the corresponding transmission power value for each transmission data when assembling the radio frame. Become.

Also, since the communication bus 106 has communication data and transmission power values in symbol units, FIG.
As shown in FIG. 3, not only users are allocated in units of wireless time slots, but also, as shown in FIG. It is also possible to divide the data into radio time slots or more and transmit the data, and it is also possible to perform transmission power control in symbol units.

Next, a procedure for starting transmission to radio communication mobile station apparatus 200 will be described with reference to FIG. 1 and FIG.
FIG. 4 is a diagram showing a signal transmission / reception relationship with the control unit 101, the radio unit 103, and the baseband processing unit 104. Since only valid data is transmitted at the start of transmission to radio communication mobile station apparatus 200, baseband processing section 104 and radio section 1
03 is used as the transmission power value on the communication bus 106 that connects the communication bus H.03.

The control unit 101 sets the communication bus 106 at the time of designating the sector to be transmitted before the start of transmission, and sets the communication bus 106
08 (step S1). At this time, after the control unit 101 confirms the setting of the communication bus 106 of the wireless unit 103 (step S2), the baseband processing unit 104 sets the communication bus 106 using the control bus 108 (step S3).

After setting the communication bus 106, the baseband processor 104 sets the communication bus 10
Then, the output starts at Step 6 (Step S4). At this time, the output of invalid data to the communication bus 106 starts, but the wireless unit 103
Is not started, the actual wireless transmission is not started. Further, the bus setting is confirmed with the baseband processing unit 104 (step S5).

Thereafter, at the start of transmission to radio communication mobile station apparatus 200, control section 101 issues a transmission start request to radio section 103 using control bus 108 (step S6).
At this time, the transmission operation of the radio unit 103 is started, but transmission to the radio is not performed because the transmission power value corresponding to the transmission data set by the baseband processing unit 104 of the communication bus 106 is 0. .

After confirming that the transmission of the radio section 103 has been started (step S7), the control section 101 instructs the baseband processing section 104 to start transmission using the control bus 108 (step S8). The baseband processing unit 104
When receiving a transmission start instruction from the control unit 101, the control unit 101 encodes actual transmission data and assembles a radio frame, and outputs the data together with a transmission power value corresponding to the communication bus 106 (step S9).

Here, the radio section 103 has already started the transmission operation, but in the case of invalid data, transmission is not actually performed because the transmission power value is 0. Further, the transmission power value is set together with the valid data, and the radio section 103 transmits to the radio communication mobile station apparatus 200 according to the transmission power value, so that only the valid data can be transmitted.

Transmission of the common physical channel is realized by simultaneously setting the transmission data and the transmission power value in the baseband processing unit 104. The transmission of the dedicated physical channel is
Before setting the communication bus 106, the control unit 101
This can be realized by setting the initial transmission power value of the transmission data in the baseband processing unit 104 and setting the communication bus 107 for the transmission path interface unit 105 and the baseband processing unit 104.

As described above, according to the radio communication base station apparatus according to one embodiment of the present invention, it is possible to set the transmission power value for each transmission data and to provide the radio communication mobile station apparatus with: Since only valid data can be transmitted, the number of users that can be accommodated can be increased.

[0057]

As described above, according to the present invention, the transmission power set value can be transmitted to the radio means together with the transmission data.
Furthermore, the transmission power value can be finely controlled in symbol units, and the number of subscribers that can be accommodated can be increased.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a radio communication base station apparatus according to an embodiment of the present invention and a communication system to which the radio communication base station apparatus is applied;

FIG. 2 is a diagram showing a configuration of a communication bus connecting a radio unit and a baseband processing unit in the radio communication base station apparatus according to the embodiment.

FIG. 3 is a diagram showing a configuration of a radio frame of a common control channel in the radio communication base station apparatus according to the embodiment.

FIG. 4 is a diagram showing a signal transmission / reception relationship in a communication start operation of the wireless communication base station apparatus according to the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 wireless communication base station device 101 control unit 102 transmission / reception amplification unit 103 wireless unit 104 baseband processing unit 105 transmission path interface unit 106, 107, communication bus 108 control bus 200 wireless communication mobile station device 300 exchange control station

Claims (11)

[Claims] 1. A wireless means for performing transmission power control of transmission data based on a transmission power setting value, and a data process for providing the transmission means and the transmission power setting value as one unit in transmission power control units to the wireless means Wireless communication base station apparatus comprising: 2. Baseband processing means for performing baseband processing on transmission data, wireless means for converting the baseband processed transmission signal into an RF signal by orthogonal transform, transmission data and a transmission power set value thereof And a communication bus for transmitting from the baseband processing means to the wireless means. 3. The wireless communication base station apparatus according to claim 2, wherein transmission data is set in predetermined bits of the communication bus, and a transmission power value is set in other predetermined bits. 4. The radio communication base station apparatus according to claim 1, wherein a transmission power value is set for each user. 5. The radio communication base station apparatus according to claim 1, wherein a transmission power value is set for each time slot. 6. The radio communication base station apparatus according to claim 1, wherein a transmission power value is set for each symbol. 7. A control means for controlling the baseband processing means to transmit transmission data and its transmission power set value to the radio means after the radio means starts a transmission operation at transmission power 0. 3. The method according to claim 2, wherein
The wireless communication base station device according to claim 6. 8. A wireless communication system comprising: the wireless communication base station device according to claim 1; and a mobile station device that communicates with the wireless communication base station device. 9. A transmission unit and its transmission power set value are given as one unit in transmission power control units to radio means for performing transmission power control of transmission data based on the transmission power set value. A transmission power control method for a wireless communication base station device. 10. A method for transmitting transmission data using a communication bus connecting baseband processing means for performing baseband processing on transmission data and wireless means for converting a baseband-processed transmission signal into an RF signal by orthogonal transform. A transmission power control method for a wireless communication base station apparatus, comprising transmitting the transmission power value. 11. The baseband processing means controls to transmit transmission data and its transmission power set value to the radio means after the radio means starts a transmission operation at transmission power 0. The transmission power control method for a wireless communication base station device according to claim 10.