JPH11275035A - Mobile station communication equipment, base station communication equipment, and radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a performance of transmission power control and base station transmission diversity from deteriorating in a communication method of the code division multiple access CDMA/time division duplex TDD system with a time division multiple access TDMA structure. SOLUTION: The system is provided with a communication control means that executes communication according to the code division multiple access(CDMA)/time division(TDD) system adopting the time division multiple access(TDMA) structure with a base station device by using a sub frame consisting of pluralities of slots, in order to monitor a notifying channel 16, and also provided with an SIR measurement device that is a reception quality measurement means to measure the quality of the signal of the notifying channel 16 of an outgoing line which is received immediately before the transmission of a signal of a communication channel 11 of an incoming line. Further, the system is provided with an incoming transmission power control section that controls the transmission power of the incoming line 11, based on the measurement result of the SIR measurement device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radio communication device, a radio communication method, and a radio communication system used for digital radio communication and the like.

[0002]

2. Description of the Related Art In the field of digital radio communication, a multiple access system has been adopted as a line connection system when a plurality of stations simultaneously communicate in the same band.
e Division Multiple Access) and CDMA (Code Div.
ision Multiple Access). TDMA is a time division multiple access, which is a multiple access technique in which an information signal is temporally compressed and transmission / reception is performed within an assigned time slot. CDMA 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 and transmitted over a band that is sufficiently wider than the original information bandwidth. Here, the direct spreading method is a method of directly multiplying an information signal by a spreading code sequence in spreading.

On the other hand, in the radio communication technology, FDD (Frequency Division) has been conventionally used for the purpose of improving communication efficiency.
ion Duplex) method and TDD (Time Division Duplex)
A duplex system such as a system is adopted. For example, T
DD is a transmission / reception same-band system, also called a ping-pong system, which is a system for performing communication by time-dividing the same radio frequency into transmission / reception.

In the case of the TDD system, since the transmission and reception are in the same band, the frequency correlation of fading fluctuation between the transmission wave and the reception wave is 1. Also, if the switching time between the two is sufficiently short, since the time correlation of the propagation path conditions such as the mutual fading fluctuation is high, the mobile station apparatus can perform transmission power control using the reception level from the base station apparatus. (Open loop transmission power control). Further, when the base station apparatus has a plurality of antennas, by applying transmission diversity for selecting an optimal transmission antenna from the reception level at each antenna, spatial diversity is not required in the mobile station apparatus, and It is also possible to reduce the size of the device.

In a specific application, a multiple access communication system such as TDMA or CDMA described above,
It may be combined with communication methods such as D and TDD,
In particular, the CDMA / TDD system is expected to be widely used in the future because the number of accommodated lines can be efficiently increased.

[0006] Transmission power control in this CDMA / TDD system can be considered to be performed by open-loop power control. However, if both uplink and downlink are open-loop control, control of one of the two sets the control criterion of the other. Therefore, according to this method, there is an inconvenience that the transmission power control often becomes unstable following the fluctuation of the received signal level due to the influence of fading or the like.

Therefore, in the CDMA / TDD system, as described in Japanese Patent Application Laid-Open No. 07-221700, a pilot signal having a constant and known power level is transmitted from a base station apparatus, and the mobile station apparatus side transmits the pilot signal. A method for performing transmission power control with higher accuracy based on a pilot signal has been proposed.

[0008]

The above CDM
A communication method that reduces interference between systems by introducing a TDMA structure into the A / TDD communication method and dividing the system on a time axis has been proposed. Further, in the CDMA / TDD communication method having such a TDMA structure, a proposal has been made to use a control channel called a broadcast channel or a perch channel (hereinafter referred to as a broadcast channel) including transmission power control information and the like. However, there are problems such as that there is no pilot channel itself transmitted at a constant and known power, and that the interval between an uplink slot and a downlink slot is wide depending on the configuration of a subframe for taking a TDMA structure. The transmission power control method disclosed in the gazette cannot be simply applied, and there is a problem that transmission power control and base station transmission diversity are not properly performed. This problem becomes apparent in a system that employs a so-called asymmetric transmission scheme in which the number of slots in the uplink and the downlink is different. Hereinafter, this problem will be specifically described.

FIG. 5 shows a CDMA / TDMA structure.
According to the TDD scheme, each user has one slot for uplink and three slots for downlink.
FIG. 3 is a diagram illustrating a frame configuration when asymmetric transmission is performed using four slots. FIG. 5A shows a frame configuration composed of one uplink slot (S1) and three downlink slots (S2 to S4), and FIG. 5B shows a frame configuration of three downlink slots (S1).
1 to S3), and a frame configuration configured in the order of one uplink slot (S4).

In the case of the frame configuration as shown in FIG. 5A, in the downlink from the base station apparatus, since the downlink slot S2 is adjacent to the uplink slot S1, the base station determines the reception level of the uplink signal. Transmission diversity and transmission power control are effective. However, CDMA with TDMA structure
In the / TDD system, time-division transmission / reception is performed with a plurality of users in one frame. Therefore, in the uplink from the mobile station device, the interval between the downlink slot S4 and the next uplink slot S1 is widened, and the reception level of the downlink signal is increased. A delay of a plurality of slots occurs from the measurement of the delay time to the reflection in the transmission, and when the fading fluctuation is fast, the characteristics are greatly deteriorated, and the accuracy of the open loop power control in the mobile station apparatus is reduced.

Conversely, in the case of a frame configuration as shown in FIG. 10B, on the uplink from the mobile station, the downlink slot S3 is adjacent to the uplink slot S4.
Open loop power control based on the reception level of the downlink signal is effective. However, in the downlink from the base station apparatus, the uplink slot S4 and the next downlink slot S
1 and the accuracy of base station transmission diversity and transmission power control is reduced.

The present invention has been made in view of the above-mentioned problems, and a communication method of a CDMA / TDD system having a TDMA structure for communicating with each user in units of a subframe composed of a plurality of time slots,
An object of the present invention is to provide a mobile station communication device, a base station communication device, and a wireless communication system that do not degrade the performance of transmission power control and base station transmission diversity.

[0013]

In order to solve the above-mentioned problems, the present invention employs a system for performing communication with a base station apparatus using a CDMA / TDD system having a TDMA structure by using a subframe consisting of a plurality of slots. In such a case, the mobile station apparatus measures the quality of the downlink broadcast channel signal received immediately before the transmission of the uplink communication channel signal, and controls the uplink transmission power based on the result of the measurement. On the other hand, in the base station apparatus, the TPC received from the mobile station is
The downlink transmission diversity and transmission power control are performed based on information or an appropriately controlled uplink signal.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mobile station communication apparatus according to a first aspect of the present invention uses a subframe consisting of a plurality of slots to perform communication control with a base station apparatus using a CDMA / TDD system having a TDMA structure. Means, a reception quality measurement means for measuring the quality of a downlink broadcast channel signal received immediately before transmission of an uplink communication channel signal, and control of uplink transmission power based on the measurement result of the reception quality measurement means. And an upstream transmission power control means.

[0015] A mobile station communication apparatus according to a second aspect of the present invention is a communication control means for executing communication by a CDMA / TDD system having a TDMA structure with a base station apparatus using a subframe consisting of a plurality of slots; CDMA demodulation means for receiving both a communication channel signal and a broadcast channel signal transmitted on the downlink from the base station apparatus and despreading them with different codes, respectively, A reception quality measurement unit that measures quality after demodulating a signal by the CDMA demodulation unit; and an uplink transmission power control unit that controls uplink transmission power based on a measurement result of the reception quality measurement unit. did.

With these configurations, the CD having the TDMA structure can be used.
In communication by the MA / TDD method, a broadcast channel can be monitored at an appropriate timing to realize accurate transmission power control and base station transmission diversity.
By employing the TDMA structure, even when the interval between the uplink slot and the downlink slot is wide, the mobile station apparatus can perform transmission power control with high accuracy, and the base station apparatus can perform transmission power control and base station transmission with high accuracy. Diversity can be achieved.

In the mobile station communication apparatus according to the second aspect, in particular, the CDM for despreading and demodulating the signal of the control channel is used.
With the A demodulation means, the control channel can be monitored more reliably.

According to a third aspect of the present invention, in the mobile station communication apparatus according to the first or second aspect, the communication control means uses a first time slot constituting a subframe in an uplink. Then, it works with the system that uses the last time slot on the downlink.

According to this configuration, since the first slot of each subframe is always an uplink slot and the last slot of each subframe is always a downlink slot, the mobile station apparatus monitors the broadcast channel in the immediately preceding downlink slot. Therefore, uplink transmission power control can be reliably performed, and the base station apparatus can reliably perform transmission diversity.

A mobile station communication apparatus according to a fourth aspect of the present invention is the mobile station communication apparatus according to any one of the first to third aspects, wherein the mobile station communication apparatus includes a base station apparatus based on the measurement result of the reception quality measuring means. Downlink TPC bit generation means for generating TPC bits used for transmission power control is provided.

[0021] By this means, the open-loop transmission power control on the uplink and the closed-loop transmission power control on the downlink can be realized in combination, so that the accuracy of the transmission power control is improved.

According to a fifth aspect of the present invention, there is provided a base station communication apparatus comprising: a communication control unit for executing communication with a mobile station apparatus using a CDMA / TDD system having a TDMA structure using a subframe including a plurality of slots; Broadcast channel signal transmitting means for transmitting a broadcast signal common to the user on the downlink, receiving means for receiving a signal whose transmission power is controlled based on the reception quality of the broadcast channel signal on the uplink, and transmission on the downlink. Transmission power control means for controlling transmission power of data.

With this configuration, the accuracy of transmission power control is improved in both the mobile station device and the base station device.

According to a sixth aspect of the present invention, in the base station communication apparatus according to the fifth aspect, the communication control means uses a first time slot constituting a subframe in an uplink and a last time slot. Works on systems that use slots in the downlink.

According to a seventh aspect of the present invention, in the base station communication apparatus according to the fifth or sixth aspect, the broadcast channel signal transmitting means transmits the broadcast signal only in a specific slot of the downlink. It was sent.

With this configuration, the base station device only needs to transmit the broadcast channel in a specific slot, so that the slot configuration of each subframe can be easily changed, and the system design has flexibility. Can be made. For example, by simply fixing the slot in which the broadcast channel signal is present and changing the allocation of the uplink slots and the downlink slots, it is possible to cope with both the target transmission system and the asymmetric transmission system.

[0027] In the base station communication apparatus according to an eighth aspect of the present invention, in the invention according to any one of claims 5 to 7, the transmission power control means is configured to control a reception quality of a signal of the broadcast channel. TPC generated by the mobile station device based on the
Information is acquired from the uplink communication channel, and the downlink transmission power is controlled based on the acquired TPC information.

With this configuration, the open-loop transmission power control on the uplink and the closed-loop transmission power control on the downlink can be realized in combination, so that the accuracy of the transmission power control is improved.

[0029] In a base station communication apparatus according to a ninth aspect of the present invention, in the invention according to any one of claims 5 to 7, the transmission power control means is configured to control a quality of a signal received by the reception means. , The downlink transmission power is controlled based on the

With this configuration, it is possible to perform open loop transmission power control using the broadcast channel on the uplink, and to perform open loop transmission power control using the uplink signal whose transmission power is controlled on the downlink. .
Such control is performed by the so-called Joint-Detection C
It is suitable for a system employing the DMA / TDD method.

[0031] A wireless communication system according to a tenth aspect of the present invention is a mobile station communication apparatus according to any one of claims 1 to 4, and a base station according to any one of claims 5 to 9. And a station communication device.

Thus, the CDMA / T of the TDMA structure
In communication by the DD scheme, a broadcast channel can be monitored at an appropriate timing to realize accurate transmission power control and base station transmission diversity.

A radio communication method according to an eleventh aspect of the present invention is characterized in that a base station apparatus and a mobile station apparatus mutually use a CDM having a TDMA structure by using a subframe consisting of a plurality of slots.
Communication control means for executing communication by the A / TDD method;
The base station apparatus transmits data on a communication channel and transmits a broadcast signal common to all users on a broadcast channel, and the mobile station apparatus transmits the broadcast channel received on a downlink immediately before transmission of an uplink signal. CDM signal
A demodulation after A demodulation, transmission power control based on the measurement result, transmission of a communication channel signal by inserting a TPC bit in the uplink, and reception of the communication channel signal by the base station apparatus. Is the acquired TPC
The transmission power control of the downlink is performed based on the bit.

A radio communication method according to a twelfth aspect of the present invention is characterized in that a base station apparatus and a mobile station apparatus mutually use a CDM having a TDMA structure by using a subframe consisting of a plurality of slots.
Communication control means for executing communication by the A / TDD method;
The mobile station device performs oven-lube power control based on the reception quality of the broadcast channel signal received immediately before transmission of the uplink signal, and performs downlink T based on the reception quality of the broadcast channel signal.
PC bits are generated and transmitted, while the base station apparatus executes closed-loop power control based on the received TPC bits.

With these configurations, the CD having the TDMA structure can be used.
In communication by the MA / TDD system, a broadcast channel can be monitored at an appropriate timing to realize accurate transmission power control and base station transmission diversity, and open-loop transmission power control on the uplink.
Since the closed loop transmission power control in the downlink can be realized in combination, the accuracy of the transmission power control is further improved.

Hereinafter, a communication device according to an embodiment of the present invention will be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a mobile station apparatus in a communication system using a radio communication apparatus according to Embodiment 1 of the present invention. The mobile station device includes one or more antennas 101 and a receiver 1
00, the transmitter 105, and the transmission / reception slot control unit 110
And mainly composed of

The receiver 100 has a CDMA for information data.
Demodulator 102 and CDMA demodulator 10 for broadcast channel
3 and an SIR measuring device 104. Further, transmitter 105 includes downlink TPC bit generating section 106,
A slot configuration unit 107, a CDMA modulator 108, and a transmission power control unit 109 are provided. The transmission / reception slot control unit 110 controls transmission / reception slots between the receiver 100, the transmitter 105, and other users.

FIG. 2 is a block diagram showing a configuration of a base station apparatus in a communication system using a wireless communication apparatus according to Embodiment 1 of the present invention. The base station apparatus includes one antenna 201, a receiver 200, a transmitter 204,
It mainly comprises a transmission / reception slot control unit 208.

The receiver 200 includes a CDMA demodulator 202
And a downlink TPC bit demodulation section 203. The transmitter 204 is used for the information data CDMA modulator 20.
5, a broadcast channel CDMA modulator 206 (common to all users), and a transmission power control unit 207. In addition, the transmission / reception slot control unit 208
0, which controls transmission / reception slots between the transmitter 204 and other users.

Next, an operation in a communication system accommodating the mobile station apparatus and the base station apparatus having the above configuration will be described.

First, the reception signal received from the antenna 101 on the mobile station apparatus side is transmitted to the transmission / reception slot control section 110.
CDMA demodulator 1 for the communication channel
02 and the CDMA demodulator 103 for the broadcast channel. The data CDMA demodulator 102 demodulates and reproduces received data, while the broadcast channel CDMA demodulator 10
3 demodulates and reproduces the downlink transmission power information and the uplink interference power information inserted in the broadcast channel, and converts the demodulated signal to S
Output to IR measuring device 104. The SIR measuring device 104 is
The reception quality is measured based on the input signal, and the propagation path condition is grasped. The SIR measuring device 104 outputs the measurement result to the downlink TPC bit generator 106 and the transmission power controller 109 of the transmitter. This SIR measurement result is
Downlink TPC bit generation section 106 uses this signal as a downlink closed loop transmission power control signal, and transmission power control section 109 uses it as an uplink open loop transmission power control signal. That is, downlink TPC bit generating section 106 generates downlink TPC bits to be transmitted to the base station based on the input SIR measurement result, and outputs the generated TPC bits to slot configuration section 107. Further, transmission power control section 109 performs transmission power control based on the SIR measurement result.

The uplink transmission data is sequentially slotted by slot configuration section 107. At this time, downlink T
The TPC bit is inserted into a specific time slot input from PC bit generating section 106. The transmission data having such a slot configuration is modulated by CDMA modulator 108 and transmitted by transmission power control section 109 with power corresponding to the measurement result input from SIR measuring instrument 104.

On the other hand, the received signal fetched from the antenna 201 on the base station apparatus side is transmitted to the transmission / reception slot control section 208.
And the CDMA demodulator 202 demodulates and reproduces the received data. Also, a TPC bit demodulation unit 2 for downlink
03 demodulates and reproduces the downlink TPC bit inserted in the received signal and outputs the demodulated TPC bit to the transmission power control section 207.

The downlink transmission data is a data CDM.
The signal is modulated by A modulator 205 and transmitted by transmission power control section 207 at a transmission power level determined by the received downlink TPC bit. At the same time, CDMA modulator 206
Modulates data transmitted on the broadcast channel. The broadcast channel is a channel that is commonly transmitted to all users using a different spreading code in the same frequency band as the communication channel. This CDMA-modulated data is transmitted to antenna 2
Sent from 01. The broadcast channel data is
Since transmission is performed at a substantially constant power level, transmission power control is not performed.

The transmission power control performed in the communication system configured as described above will be specifically described with reference to a frame configuration diagram shown in FIG. In FIG. 3, one frame is composed of four subframes, and each subframe is composed of four subframes.
A description will be given of a system having a frame configuration including one time slot and a system in which each slot of one subframe performs an asymmetric transmission with a configuration of one slot and three slots of downlink. Communication is performed by the CDMA / TDD system, but each subframe is assigned to each user, and all frames are time-division multiplexed in a TDMA structure.

In the downlink, the base station transmits a broadcast channel 16 to all users. This broadcast channel includes downlink transmission power information and uplink interference power information, and the mobile station device receives these information and uses it for measuring downlink reception power.

As shown, the broadcast channel 16 includes 1
It is arranged in all downlink slots over the entire frame. Focusing on the user # 1, the downlink slot 1 before the assigned four slots 11, 12, 13, 14
5, the broadcast channel 16 is also transmitted. The mobile station does not monitor the received power of the communication channel but measures the received power of the broadcast channel in the downlink slot 15 located immediately before the uplink slot 11 so that the immediately preceding channel state can be grasped. The measurement method includes measuring the reception power of the symbol data transmitted on the broadcast channel,
IR measurement may be used. This SIR measurement may be performed using the data of the communication channel. In uplink slot 11, transmission power is controlled according to the measurement result, and a base station inserts a TPC bit for SIR type closed loop transmission power control used for a downlink to perform transmission.

As described above, even when the space between the downlink slot and the next uplink slot is wide due to the TDMA structure, open loop transmission power control can be performed in the uplink slot 11.

On the other hand, downlink slots 12, 13, 14
Then, the closed-loop transmission power control is performed by demodulating the TPC bit transmitted in the uplink slot 11.

As a result, even when the fading fluctuation is fast, it is possible to sufficiently follow both the uplink and the downlink, and the performance is improved.

The broadcast channel is transmitted on the downlink from the base station apparatus. However, it is not always necessary to transmit the broadcast channel in all slots of the downlink. The transmission power control for the mobile station device according to the present invention is sufficiently possible.

By the way, since information such as downlink transmission power information and uplink interference power information can be inserted into the broadcast channel, the use of the broadcast channel makes it possible to measure the level of the received signal at the mobile station as described above. It is also possible to combine closed loop control with open loop control. For example, by converting the transmission power of the broadcast channel at the base station into bits and inserting it into the broadcast channel, the mobile station that has acquired this downlink power information from the broadcast channel can determine the transmission power level of the broadcast channel and the actual received power. By calculating the difference, the channel condition of the propagation path can be accurately estimated. Such processing may be combined with closed-loop control using TPC information or the like received from the base station.

The transmission power (Tms) of the mobile station device when performing this control may be specifically obtained by the following equation, for example.

Tms = (Pbts + Ptpc) + (Tbts−Rms) where Pbts, Ptpc, Tbts, and Rms are the target received power at the base station, the corrected power corresponding to the closed-loop TPC from the base station, and the base station, respectively. The (estimated) transmission power of the station broadcast channel and the reception power of the broadcast channel at the mobile station.

That is, the mobile station apparatus sets the TPC obtained on the downlink to the target reception power (Pbts) at the base station.
Based on the corrected power (Ptpc) based on the bits, closed loop control is performed on the uplink, and the difference between the estimated transmission power (Tbts) of the base station broadcast channel and the received power (Rms) of the broadcast channel is calculated. Is added.

Of course, the estimated transmission power (Tbts) of the base station broadcast channel is inserted as information into the downlink from the base station apparatus, and this broadcast channel is at least the downlink which is located immediately before the uplink transmission slot. Is always transmitted to the slot. That is, the base station apparatus is controlled so as to blow the broadcast channel in which the transmission power information is inserted at that timing.

As described above, in the mobile station, by performing the open loop control and the closed loop control in combination, the accuracy of the transmission power control is remarkably improved.

It should be noted that, in the present embodiment, one slot upstream,
Although the description has been given of an example of a system that performs asymmetric transmission with a downlink three-slot configuration, how to allocate each slot to upper and lower lines can be freely designed according to the system.
For example, the first slot to the fourth slot may be changed to, for example, ascending, descending, ascending, or descending, or as ascending, ascending, descending, or descending.

However, in consideration of transmission diversity in the base station, it is desirable that the first slot is used for the uplink and the fourth slot is used for the downlink. This is because, in order for the base station to perform transmission diversity on the downlink, an uplink slot from a user who uses the subframe immediately before is required. Therefore, by using the first slot in the uplink and the fourth slot in the downlink, the mobile station can perform transmission power control using the broadcast channel, and the base station can transmit using the reception signal from the mobile station. Diversity becomes possible.

A base station apparatus that performs such transmission diversity will be described with reference to FIG. FIG. 4 is a schematic block diagram illustrating an example of a configuration of a base station device in a communication system using a multiple access communication device.

This base station apparatus has a plurality of antennas 40
1, 402,..., A receiver 400, a transmitter 405,
It mainly comprises a transmission / reception slot control unit 409.

The receiver 400 has a CDMA demodulator 403
And an antenna reception power comparator 404. The transmitter 405 includes a CDMA modulator 406 for information data,
Broadcast channel CDMA modulator 408 (common to all users)
And an antenna selection control unit 507. Also,
The transmission / reception slot control unit 409 adjusts the transmission / reception slots of the receiver 400 and the transmitter 405.

The received signals fetched by the antennas 401 and 402 are reproduced in data by the CDMA demodulator 403, and are monitored by the antenna reception power comparator 404 provided in parallel with the CDMA demodulator 403. . The antenna reception power comparator 404 notifies the antenna selection control signal to the antenna selection control unit 407 so as to select the antenna having the best propagation path condition.

On the other hand, the transmission data is transmitted by the CDMA modulator 406
, And is transmitted to the antenna selection / selection control unit 407, and controls the transmission power of each antenna end according to the antenna selection control signal input from the antenna reception power comparator 404, thereby selecting the transmission antenna for each mobile station. Perform control. The comparison of the reception power at each antenna end is performed by measuring and comparing the reception level of the data of the communication channel of the uplink slot 11 shown in FIG.
The measurement result is reflected on data transmission of the communication channel in the downlink slots 12, 13, and 14. On the other hand, the data inserted into the broadcast channel is modulated by the CDMA modulator 408 and transmitted from the antenna end in the same manner as the communication channel data, but the antenna selection control is not performed on the broadcast channel.

A so-called Joint-Detection type CD
A system adopting the MA / TDD method has been proposed,
In this method, open-loop transmission power control is performed on a downlink based on an uplink signal received by a base station. The transmission power control of the present invention can be applied to such a system.

In addition, the first slot of each subframe is fixed as an uplink slot and the fourth slot is fixed as a downlink slot. If the broadcast channel is transmitted only in the fourth slot of the downlink, the system design and change Becomes easier. That is, since the base station device only needs to transmit the broadcast channel in a specific slot,
The slot configuration of each subframe can be easily changed, and flexibility can be given to the system design.

For example, by fixing the slot in which the broadcast channel signal is present and changing the allocation of uplink slots and downlink slots, it is possible to cope with both symmetric transmission systems and asymmetric transmission systems. it can.
Furthermore, the present invention can be applied to a highly versatile public network system in which the frame configuration is unified, and a different slot configuration is used for each subframe, or each mobile station device can be subordinate to a specific base station. It can be easily adapted to premises systems.

[0069]

As described above, according to the present invention,
In CDMA / TDD communication having a TDMA structure, base station transmission diversity and transmission power control can be performed with high accuracy, and even when fading fluctuations are fast, both uplink and downlink can be sufficiently followed, and communication can be performed. There is an effect that quality is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mobile station device in a communication system using a wireless communication device according to one embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a base station apparatus according to the embodiment.

FIG. 3 is a diagram illustrating a frame configuration used in the communication system according to the embodiment;

FIG. 4 is a block diagram showing a configuration of another base station apparatus according to the above embodiment.

FIG. 5 shows a CDMA / TDMA having a TDMA structure according to a conventional example.
TDD frame configuration diagram

[Explanation of symbols]

100, 200, 400 Receivers 102, 103, 202, 403 CDMA demodulator 104 SIR measuring instrument 105, 204, 405 Transmitter 106 Downlink TPC bit generator 109, 207 Transmission power controller 110, 208, 409 Transmission / reception slot Control unit 203 Downlink TPC bit demodulation unit 108, 205, 206, 406, 408 CDMA modulator 404 Antenna reception power comparator 407 Antenna selection control unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04L 5/16 H04J 13/00 A (72) Inventor Mitsuru Uesugi 3-1, Tsunashimahigashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Matsushita Communication Inside the Industrial Co., Ltd. (72) Inventor Osamu Kato 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture, Matsushita Communication Industrial Co., Ltd.

Claims (12)

[Claims] 1. A communication control means for executing communication with a base station apparatus using a CDMA / TDD system having a TDMA structure using a subframe consisting of a plurality of slots, and a downlink received immediately before signal transmission of an uplink communication channel. Characterized in that it comprises: reception quality measurement means for measuring the quality of the broadcast channel signal; and uplink transmission power control means for controlling uplink transmission power based on the measurement result of the reception quality measurement means. Station communication equipment. 2. A communication control means for executing communication by a CDMA / TDD system having a TDMA structure with a base station apparatus using a subframe consisting of a plurality of slots, and a communication channel transmitted from the base station apparatus via a downlink. CDMA demodulating means for receiving both the signal of the broadcast channel and the signal of the broadcast channel and despreading with a different code, and measuring the quality after demodulating the signal of the downlink broadcast channel immediately before transmitting the uplink signal by the CDMA demodulation means. A mobile station communication apparatus comprising: a reception quality measurement unit; and an uplink transmission power control unit that controls uplink transmission power based on a measurement result of the reception quality measurement unit. 3. The system according to claim 1, wherein said communication control means operates in a system in which a first time slot constituting a subframe is used in an uplink and a last time slot is used in a downlink. The mobile station communication device according to claim 2. 4. A downlink TPC bit generation means for generating TPC bits used for transmission power control of a base station apparatus based on a measurement result of the reception quality measurement means. The mobile station communication device according to any one of claims 1 to 3. 5. A communication control means for performing communication with a mobile station apparatus using a CDMA / TDD scheme having a TDMA structure using a subframe consisting of a plurality of slots, and a broadcast for transmitting a broadcast signal common to all users via a downlink. Channel signal transmitting means, receiving means for receiving a signal whose transmission power is controlled based on the reception quality of the broadcast channel signal via the uplink, transmission power control means for controlling the transmission power of downlink transmission data, A base station communication device comprising: 6. The communication control means operates in a system in which a first time slot constituting a subframe is used in an uplink and a last time slot is used in a downlink. Base station communication device. 7. The base station communication apparatus according to claim 5, wherein said broadcast channel signal transmitting means transmits a broadcast signal only in a specific slot of a downlink. 8. The transmission power control unit acquires TPC information generated by a mobile station apparatus based on the reception quality of the broadcast channel signal from an uplink communication channel, and based on the acquired TPC information. 8. The base station communication apparatus according to claim 5, wherein the base station communication apparatus controls downlink transmission power. 9. The transmission power control unit according to claim 5, wherein the transmission power control unit controls downlink transmission power based on a quality of a signal received by the reception unit. Base station communication device. 10. A radio communication comprising the mobile station communication device according to any one of claims 1 to 4 and the base station communication device according to any one of claims 5 to 9. system. 11. A base station apparatus and a mobile station apparatus mutually perform TDMA using a subframe consisting of a plurality of slots.
A communication control means for executing communication according to the CDMA / TDD system having a structure, wherein the base station device transmits data on a communication channel and transmits a broadcast signal common to all users on a broadcast channel, The apparatus measures the quality after CDMA demodulation of the broadcast channel signal received on the downlink immediately before transmission of the uplink signal, performs transmission power control based on the measurement result, and inserts a TPC bit on the uplink to transmit the communication channel. The base station apparatus that has transmitted the signal of
A wireless communication method comprising: performing downlink transmission power control based on an acquired TPC bit. 12. A base station apparatus and a mobile station apparatus mutually use TDMA by using a subframe consisting of a plurality of slots.
Communication control means for performing communication according to the CDMA / TDD scheme having a structure, wherein the mobile station device performs oven-lube power control based on the reception quality of the broadcast channel signal received immediately before transmission of the uplink signal, The base station apparatus generates and transmits a downlink TPC bit based on the reception quality of the broadcast channel signal.
A wireless communication method, wherein closed-loop power control is performed based on a C bit.