JP2002204470A - Wireless communication system, communication control method for the wireless communication system and its management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-speed data communication service to mobile terminals while suppressing increase in the transmission power of the entire wireless communication system. SOLUTION: In the wireless communication system consisting of a central base station that deploys macro cells covering a wide communication available area, micro cell base stations that attain high-speed data communication and mobile terminals, the terminal has a communication speed discrimination means that discriminates whether or not a communication speed higher than that between the central base station and the terminal is required on the occurrence of a data communication request and with an access control means that transmits a control signal denoting a high-speed data communication request when the communication speed discrimination means discriminates the need for the higher communication speed, and the micro cell base station deploys a micro cell whose communication available area is smaller than that of the micro cell when receiving the control signal denoting the high-speed data communication request from the terminal and makes wireless access to the terminal to conduct data communication at a speed higher than that of the central base station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radio communication system for performing data communication between a terminal and a base station, a communication control method thereof, and a management method.

[0002]

2. Description of the Related Art The demand for high-speed data communication in a wireless communication system environment is increasing with the recent trend of mobile communication. On the other hand, conventionally, high-speed data communication has been realized by increasing the communication speed per communication channel or multiplexing a plurality of communication channels. However, in such a method, it is necessary to increase the transmission power of the wireless communication system in accordance with the increase in the data communication speed.

For example, CDMA (Code Division Mult)
iple Access) wireless communication system,
Dividing the transmission data into a plurality of parts and multiplexing the communication channels using separate spreading codes can increase the data communication speed.In this case, the signal power transmitted by the base station and the terminal is, It increases in proportion to the number of multiplexed communication channels. It is also possible to increase the communication speed per communication channel by lowering the spreading factor per transmission data bit. However, since the spreading gain decreases as the spreading factor decreases, it is necessary to prevent the SN ratio from deteriorating. It is necessary to increase the transmission power of the radio signal transmitted by the base station and the terminal.

On the other hand, it is conceivable to suppress transmission power on the transmission side by providing a high-performance amplifier on the reception side and receiving a radio signal with a large amplification gain. However, in mobile communication terminals, there is a strong demand for small size and low power consumption, and it is difficult to mount an amplifier having a large amplification factor and an ideal noise figure (NF).

[0005] An increase in transmission power accompanying an increase in the transmission speed of transmission data is particularly remarkable in a base station that deploys a large area radio cell having a radius of several kilometers and accommodates a large number of terminals. For example, even when performing high-speed data communication with a specific terminal existing in the radio cell, the base station transmits a radio signal uniformly in the radio cell, so that the base station corresponds to a cell radius (several km). It is necessary to transmit the radio signal by performing amplification to compensate for the propagation loss. At this time, if the original signal power to be transmitted increases in accordance with the increase in the communication speed, the transmission power of the amplified radio signal is further increased to compensate for the propagation loss. . Such an increase in the transmission power of the base station is limited due to hardware restrictions and causes interference with other wireless communication systems.

As a method of solving such a problem, for example, there is a conventional wireless communication system disclosed in Japanese Patent Application Laid-Open No. 2000-23238. FIG. 13 is a configuration diagram showing the conventional wireless communication system. Hereinafter, the operation of the conventional wireless communication system will be described with reference to FIG. In the wireless communication system, a central base station 103 having a large transmission power deploys a wireless cell (hereinafter, referred to as a macro cell) 104 having a radius of several km and a large area. There is a terminal 105 that can communicate. The central base station 103 and the terminal 105
Between, the transmission speed of the data is limited to a low speed due to both transmission power restrictions, and in addition to the transmission and reception of voice and control data,
Only low-speed data communication is possible.

On the other hand, another base station 101 is arranged in the macro cell 104, and a radio cell (hereinafter, referred to as a micro cell) 102 having a small area of about 100 m in radius.
Has been expanded. Distance r _A between the base station 101 and terminal 105, the distance r _B of the central base station 103 and terminal 105
It is possible to estimate smaller than the above, and it is possible to suppress the amplification factor of the radio signal for compensating for the propagation loss. As a result, the transmission power of the radio signal of the base station 101 is set lower than that of the central base station 103 of the macro cell.

When a terminal transmits a signal with the same transmission power, communication with the base station 101 of the micro cell having a short propagation distance has a smaller propagation loss, which is advantageous for high-speed data communication. Therefore, the maximum communication speed U _micro central base station 103 maximum communication speed U _ma base station 101 of _cro and micro cell of the macro cell, defined as U _micro> U _macro.

Each of the base stations 101 and 103 constantly broadcasts a control signal including the identification information of the base station and a transmission power value in each of the radio cells.
02, 104, both base stations 101, 10
3 is received. Terminal 105, based on the control signal, the maximum communication speed U _micro of each base station, U _macro, transmission power of each base station, calculates the propagation loss amount and the like from each base station to the terminal 105.

When a call request for high-speed data communication is generated at the terminal 105, the terminal 105 satisfies the communication speed designated by the call request from among the base stations 101 and 103 receiving the control signal. Then, the base station 101 having the minimum transmission power is selected as the optimum base station, and the base station 10
1 and starts communication.

On the other hand, when a call request for voice or low-speed data communication occurs at terminal 105, terminal 105 selects central base station 103 in which macro cell 104 is deployed as the optimum base station, and The communication is started by connecting to the terminal 103.

[0012]

In the above-mentioned conventional wireless communication system, the terminal 105 is composed of a plurality of base stations 101, 1
03 receives a plurality of control signals that are constantly informed,
Based on the control signal, a base station that satisfies the communication speed specified by the call request is specified and communication is performed. Therefore, when continuing the high-speed data communication, the terminal 105 needs to maintain the connection with the base station 101 specified at the time of calling.
There is a problem that the base station cannot move to the outside of the deployed microcell 102.

If the terminal 105 moves out of the micro cell 102 during high-speed data communication,
Since communication with the base station 101 connected up to that time cannot be maintained, control signals of the base stations 101 and 103 present in the vicinity are received, and another base station 101 arranged in the macro cell 104 is specified. Then, there is a problem that such reconnection processing causes deterioration of communication quality.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and as a whole, a mobile communication system has a mobile terminal which performs high-speed data communication while suppressing an increase in transmission power accompanying an increase in communication speed. It is an object of the present invention to provide a wireless communication system capable of improving the performance.

[0015]

Means for Solving the Problems In order to solve the above problems and achieve the object, a wireless communication system according to the present invention comprises: a central base station which deploys a macro cell having a wide communicable area; A terminal for wirelessly connecting to the central base station to perform data communication with a low communication speed, and when a data communication request occurs, a communication speed higher than the communication speed with the central base station is required. A communication speed determination unit that determines whether or not, a terminal having a connection control unit that transmits a control signal of a high-speed data communication request when it is determined that a high communication speed is required by the communication speed determination unit,
Located in the macro cell, only when a control signal including a high-speed data communication request is transmitted from the terminal, expand a micro cell in which the communicable area is smaller than the macro cell, and establish a wireless connection with the terminal. And a micro cell base station that performs data communication at a higher speed than the previous central base station.

In a wireless communication system according to the next invention, a plurality of microcell base stations are arranged in a macrocell, and a base station position in which position information of each of the plurality of microcell base stations is recorded in advance. An information database, the terminal has position information creating means for detecting position information of the terminal, and the connection control means transmits the control signal of the high-speed data communication request including the position information, and transmits the base station position information database. Specifies a microcell base station capable of wireless connection with the terminal based on the position information of each of the plurality of microcell base stations and the position information of the terminal included in the control signal of the high-speed data communication request. Only the specified microcell base station is configured to perform high-speed data communication by performing wireless connection with the terminal.

In a wireless communication system according to the next invention, a plurality of microcell base stations are arranged in a macrocell, and a base station position in which position information of each of the plurality of microcell base stations is recorded in advance. An information database, the central base station includes a direction finding means for estimating a direction of arrival of a radio signal transmitted from a terminal requesting high-speed data communication, and a reception intensity measurement for measuring a reception intensity of a radio signal transmitted from the terminal. Means, and a terminal position estimating means for estimating the position of the terminal based on the arrival direction and reception strength of the radio signal, wherein the base station position information database stores the position information of each of the plurality of microcell base stations. And a microcell base station capable of wireless connection with the terminal based on the terminal position information estimated by the terminal position estimating means. And, only the micro cell base station which is the specified, characterized in that the terminal and is configured to perform high-speed data communication performing wireless connection.

In the wireless communication system according to the next invention, the base station position information database calculates a maximum communication speed of data communication that can be used by the terminal based on the position information of the terminal and sends a response to the terminal. Prior to the start of data communication, the communication speed determination means queries the base station position information database for available communication speed of data communication, and asks the user of the terminal for the available data communication. 4. The wireless communication system according to claim 2, wherein a communication speed of data communication used for data communication is selected based on a maximum communication speed.

In the wireless communication system according to the next invention, when the terminal is determined to require high-speed data communication, the required quality determining means determines whether the terminal requires high-speed data communication with good communication quality. When the required quality determination means determines that high-speed data communication with good communication quality is required, the connection control means transmits the control signal of the high-speed data communication request including the high-quality communication request. ,
The microcell base station specified by the base station position information database is configured to expand the microcell in accordance with the high quality communication request and perform high-speed data communication with the terminal.

In the wireless communication system according to the next invention, when a terminal is determined to require high-speed data communication, a required quality determining means for determining whether high-speed data communication with good communication quality is required. When the required quality determination means determines that high-speed data communication with good communication quality is required, the connection control means transmits the control signal of the high-speed data communication request including the high-quality communication request. ,
The base station position information database specifies all microcell base stations in a predetermined area including the terminal according to the high quality communication request, and each specified microcell base station transmits data to the terminal individually. It is configured to transmit.

In the wireless communication system according to the next invention, the terminal has a moving speed detecting means for detecting a moving speed of the terminal, and the required quality judging means determines that the detected moving speed is lower than a predetermined threshold value. Is also determined to require high-speed data communication with good communication quality when the communication speed is high.

The wireless communication system according to the next invention further comprises a microphone cell base station control means for controlling a plurality of micro cell base stations, and the communication speed determination means comprises:
When a request for data communication occurs, it is determined whether a communication speed higher than the communication speed with the microcell base station is required, and if it is determined that a higher communication speed is required as a result, The connection control means transmits a control signal of a high-speed large-capacity data communication request to the microcell base station control means, and the microcell base station control means that has received the control signal is specified by the base station position information database. The transmission data to the terminal is multi-station multiplex-transmitted via the plurality of micro-cell base stations.

In the wireless communication system according to the next invention, the connection control means transmits a control signal for a high-speed and large-capacity data communication request, including information on a requested communication speed, and receives the control signal. The microcell base station control means calculates a maximum communication speed that can be provided by the plurality of microcell base stations specified by the base station position information database, and the maximum communication speed is lower than the requested communication speed. In this case, the terminal is characterized by inquiring whether or not to perform high-speed data communication at the maximum communication speed.

[0024] In the radio communication system according to the next invention, the central base station transmits data for the terminal to the macro cell as a radio signal with a predetermined transmission power, and replaces the micro cell base station with the macro cell. A reception antenna for receiving a radio signal transmitted from the central base station, a low-distortion transmission amplifier for amplifying a reception signal received by the reception antenna, and a retransmission for transmitting the amplified reception signal to a terminal. And a repeater having a transmitting antenna, wherein the terminal receives a radio signal retransmitted from the repeater and performs high-speed data communication with the central base station. .

In the communication control method for a wireless communication system according to the next invention, high-speed data communication can be performed in a narrow area in a macro cell in which a central base station capable of performing low-speed data communication in a wide area is deployed. When a plurality of microcell base stations are arranged, and the terminal performs a data communication request from the terminal in the communication control method of the wireless communication system for performing data communication with the central base station or the microcell base station, A communication speed determining step of determining whether a communication speed higher than a communication speed of data communication with the central base station is required; and determining that a high communication speed is required in the communication speed determining step. A connection control step of transmitting a control signal of a high-speed data communication request when the control signal is transmitted, and a control signal of a high-speed data communication request is transmitted in the connection control step. A high-speed data communication service providing step of expanding a micro-cell in the micro-cell base station and performing high-speed data communication between the terminal and the micro-cell base station. .

In the communication control method for a wireless communication system according to the next invention, when it is determined in the communication speed determination step that a high communication speed is required, the position information of the terminal is detected and A terminal position detecting step of outputting position information to the connection control step, and the position information transmitted and included in the control signal of the high-speed data communication request in the connection control step, and a plurality of pre-stored microcell base stations, respectively. A micro-cell base station specifying step of specifying a micro-cell base station capable of high-speed data communication with the terminal based on the location information, and the high-speed data communication service providing step is performed by the connection control step. Only when a control signal including a high-speed data communication request is transmitted, the microcell specified in the microcell base station specifying step Chikyoku only to expand the micro-cell, characterized in that to perform high-speed data communication between the terminal and the identified micro-cell base station.

In the communication control method for a wireless communication system according to the next invention, when a control signal including a high-speed data communication request is transmitted in the connection control step, a terminal for estimating position information of the terminal is further provided. A position estimation step;
A microcell base station specifying step of specifying a microcell base station capable of high-speed data communication with the terminal based on the position information and the position information of each of the plurality of microcell base stations stored in advance; The high-speed data communication service providing step includes the step of micro-controlling only the micro-cell base station specified in the micro-cell base station specifying step only when a control signal including a high-speed data communication request is transmitted in the connection control step. A cell is deployed, and high-speed data communication is performed between the terminal and the specified microcell base station.

In the communication control method for a wireless communication system according to the next invention, when it is determined in the communication speed determining step that a high communication speed is required, a high-speed data communication with good communication quality is performed. A request quality determination step of determining whether or not high-speed data with good communication quality is required in the required quality determination step. The high-speed data communication service providing step includes the step of specifying a microcell base station when the control signal of the high-speed data communication request including the high-quality communication request is transmitted in the connection control step. Deploying a microcell in which the communicable area is expanded to the microcell base station specified in the step, and connecting the terminal and the specified microcell base to each other. Characterized in that to perform high-speed data communication between the stations Prefecture.

In the communication control method for a wireless communication system according to the next invention, the micro cell specifying step includes the step of controlling the connection when the control signal of the high speed data communication request includes a high quality communication request. In the position information transmitted included in the control signal of the high-speed data communication request,
Based on the position information of each of the plurality of microcell base stations stored in advance, all microcell base stations in a predetermined area including a terminal that has transmitted a control signal for a high-speed data communication request are specified, and high-speed data communication is performed. The service providing step is characterized in that each of the specified microcell base stations transmits data to the terminal to perform high-speed data communication.

[0030] In the management method of the wireless communication system according to the next invention, the total communication time of the low-speed data communication performed by the terminal with the central base station and the communication time between the terminal and the microcell base station are determined. The total communication time of the high-speed data communication without the high quality request and the total communication time of the high-speed data communication with the high quality request are separately tabulated, and the total communication time of the data communication is added to the total communication time of each data communication. And a user charge management step of calculating a communication fee for each data communication by multiplying the usage fee per unit time separately set for the data communication.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of the wireless communication system according to the first embodiment. FIG.
, 1a and 1b are microcells 2a,
2b is a microcell base station, 3 is a macrocell 4
Is a central base station. Actually, a large number of microcell base stations are arranged in the macrocell 4 and the microcells are spread in a plane. However, in FIG. 1, for simplicity, two microcell base stations 1a and 1b are provided. Only shown.

Reference numeral 5 denotes a terminal for performing data communication by wirelessly connecting to any of the base stations 1a, 1b, and 3; 6, a communication network to which the base stations 1a, 1b, and 3 are connected;
Is a microcell position information database that records the arrangement position information of all the microcell base stations 1a and 1b and the central base station 3, and 8 monitors the connection status of the terminal 5 to the communication system, and stores charging information for the terminal 5. It is a user billing database to be recorded.

Hereinafter, the operation of the wireless communication system configured as described above will be described with reference to the drawings. Embodiment 1
In the wireless communication system, the central base station 3 deploys a macro cell 4 having a cell radius of, for example, about 3 km.
The terminal 5 is connected to the central base station 3 in the macro cell 4 and can perform, for example, low-speed voice communication or data communication with a communication speed of about 100 Kbit / sec. However, the central base station 3 has, for example, a communication speed of several M to several tens Mbit / s due to transmission power limitations and performance restrictions such as the amplification gain of an amplifier mounted on the terminal 5 and NF.
It is impossible to directly provide the terminal 5 with a high-speed data communication service of about second or more.

The central base station 3 constantly broadcasts a control signal including identification information of the base station and incoming call information for the terminal, and the terminal 5 receives the control signal to transmit a radio signal. Communication control for the central base station 3, such as management and call control, can be performed.

On the other hand, a plurality of microcell base stations 1a and 1b are arranged inside the macrocell 4, and each of the microcells 2a has a cell radius of about 100 m, for example.
2b.

Here, the propagation loss L in free space
_p [dB] is given by the following equation 1.

(Equation 1) d is the distance [m] between the base station and the terminal, and λ is the carrier wavelength [m] of the radio signal.

In the above equation (1), the radio communication system:
For example, when a carrier frequency of 2 GHz is used, the maximum estimated propagation loss of the microcells 2a and 2b (cell radius 100 m) is about 79 dB, and
In the case of (cell radius 3 km), the maximum estimated propagation loss is about 108 dB, while the propagation loss is about 30 dB.
B is small. The actual propagation loss in an urban area or the like depends on the distance d between the base station and the terminal.
It is known that it becomes larger than _p , and the relative propagation loss difference between the macro cell and the micro cell is further increased.

Each base station needs to amplify and output a radio signal to be transmitted with a large amplification factor in order to compensate for the above-mentioned propagation loss.
In (a) and (1b), the amplification gain for compensating for the propagation path loss can be set low, and accordingly, the communication speed can be increased by channel multiplexing or the like. For example,
As described above, when the relative propagation loss difference between the micro cells 2a, 2b and the macro cell 4 is about 30 dB, the micro cell base stations 1a, 1b multiplex communication channels with the same transmission power as the central base station 4. It is possible to increase the communication speed of the transmission data up to about 1000 times by using a method such as conversion, and to provide the terminal 5 with a high-speed data communication service with a communication speed of several M to several tens Mbit / sec. I can do it.

FIG. 2 is a block diagram of the terminal 5. FIG.
, 11 is a communication speed determining unit that receives a data communication request from a user application connected to the terminal 5 and determines a required communication speed, 12 is a position information creating unit that detects the position of the terminal 5, and 13 is Each of the base stations 1a,
This is a connection control unit that performs communication control with 1b and 3.

The connection control unit 13 receives a control signal broadcast from the central base station 3 and performs communication control processing such as radio management, mobility management, and call control. The connection control unit 13
Has a communication control processing function for the microcell base stations 1a and 1b, and connects to the microcell base stations 1a and 1b in parallel with the communication control processing for the central base station 3 or by switching between the two processes. Is possible.

When a data communication request is generated from a user application, the communication speed determining unit 11 receives the request and determines a required communication speed. For example, when a transmission / reception request of voice or text data is issued from the user application, the required communication speed is determined to be low, and the determination result is output to the connection control unit 13.
The connection control unit 13 performs call connection control on the central base station 3 based on the determination result and starts communication control.

On the other hand, when a communication request such as video streaming data is issued from the user application, the communication speed judging section 11 judges that the required communication speed is high, and sends the judgment result to the connection control section. 13 is output.

Next, upon receiving the request for the high-speed data communication, the connection control unit 13 inquires the position information creation unit 12 about the position information of the terminal. The position information creating unit 12 has a position information detecting function by GPS, detects the position of the terminal 5 and outputs the position information. Next, the connection control unit 13
A central base station 3 that creates a control signal for a request for high-speed data communication and a connection request including the location information and controls communication.
Send to

The central base station 3 having received the control signal including the request for the high-speed data communication from the terminal 5 reads out the request for the high-speed data communication and the position information of the terminal 5 from the control signal. Next, the central base station 3 sends the position information of the terminal 5 to the base station position information database 7, and the microcell base station capable of providing the terminal 5 with the high-speed data communication service to the base station position information database 7. Contact

FIG. 3 is an explanatory diagram illustrating base station position information stored in the base station position information database 7. The base station position information database 7 stores, for example, information on base station identification information, base station position information, cell radius, transmission power, and available communication speed for each base station belonging to the wireless communication system. Have been.

Next, the base station position information database 7
The distance between the terminal and the microcell base station is calculated from the position information of the terminal 5 and the position information of each microcell base station stored in the database, and a microcell base station capable of providing a high-speed data communication service is specified. I do. In the example of FIG. 1 described above, first, all the microcell base stations 1a and 1b capable of supporting high-speed communication are specified from all the base stations recorded in the database. Next, from the terminal 5, each of the specified microcell base stations 1a, 1b
Are sequentially calculated, and it is confirmed whether the calculated distance is smaller than the cell radius of the microcell deployed by the microcell base station. In the example of FIG.
a, and the microcell base station 1a satisfies the above condition, the base station position information database 7 specifies the microcell base station 1a as a microcell base station capable of providing a high-speed data communication service, and The result is notified to the central base station 3.

The central base station 3 having received the specified result requests the micro cell base station 1a to provide a high-speed data communication service via the communication network 6, and
A response indicating that the high-speed data communication service is provided by the microcell base station 1a is included in the control signal broadcast in the macrocell 4, and is transmitted to the terminal 5.

The microcell base station 1a receiving the request
Starts notification of a control signal including base station identification information and the like in the microcell 2a. On the other hand, the terminal 5 receives the response of the provision of the high-speed data communication service transmitted from the central base station 3, and recognizes from the response that the high-speed data communication service is provided by the microcell base station 1a. Next, the connection control unit 13 of the terminal 5 receives the control signal broadcast from the microcell base station 1a, performs communication control processing, and starts high-speed data communication.

The microcell base station 1a that has started high-speed data communication with the terminal 5 reports via the communication network 6 to the user charging database 8 that the terminal 5 has started high-speed data communication. The user charging database 8 records the use start time of the high-speed data communication by the terminal 5.

Further, the connection control section 13 of the terminal 5 periodically transmits a control signal including position information to the central base station 3 even during high-speed data communication with the microcell base station 1a. The central base station 3 receives the position information transmitted from the terminal 5 and inquires the base station position information database 7 to inquire about a microcell base station capable of high-speed data communication service.

For example, if the terminal 5 moves and approaches the microcell base station 1b while performing high-speed data communication by connecting to the microcell base station 1a, the result of the inquiry to the base station position information database 7 is obtained. The microcell base stations 1a and 1b are specified as base stations capable of providing a high-speed data communication service. Next, the central base station 3 requests the specified microcell base stations 1a and 1b to provide a high-speed data communication service via the communication network 6.

The microcell base station 1b receiving the request
Is the microcell base station 1a already connected to the terminal 5.
With the terminal 5 via the communication network 6 and start providing a high-speed data communication service to the terminal 5. The terminal 5 receives data signals transmitted from the microcell base stations 1a and 1b, combines them, and continues high-speed data communication.

Next, when the terminal 5 moves outside the micro cell 2a, the micro cell base station 1a is suitable for the high-speed data communication service in response to the inquiry from the central base station 3 to the base station position information database 7. Will no longer be identified. In this case, the central base station 3 instructs the microcell base station 1a to stop providing the high-speed data communication service to the terminal 5.

Next, in the terminal 5 performing high-speed data communication with the microcell base station 1b, when the user application completes the data communication, the connection control unit 13
Terminates the connection with the microcell base station 1b and continues only the communication control processing for the central base station 3. On the other hand, the microcell base station 1b that has finished the high-speed data communication with the terminal 5 reports the end of the high-speed data communication by the terminal 5 to the user charging database 8 via the communication network 6. The user billing database 8 records the end time of using the high-speed data communication of the terminal 5.

Here, the user billing database 8 includes:
The use start time and use end time of the high-speed data communication using the microcell base stations 1a and 1b by the terminal 5 are recorded. The user billing database 8 calculates the high-speed data communication use time of the terminal 5 from the record, multiplies the time by a predetermined usage fee per unit time, and calculates the total use fee of the high-speed data communication service of the terminal 5. . The service provider of the wireless communication system charges a total usage fee for the high-speed data communication service to the user of the terminal 5.

With such a configuration, in the radio communication system according to the first embodiment, microcell base stations 1a and 1b capable of high-speed data communication are provided in macrocell 4 developed by central base station 3. A plurality of microcells 2a and 2b deployed by the above are arranged, and a microcell base station close to the terminal 5 is specified based on the position information of the terminal 5,
A high-speed data communication service is provided from the microcell base station. Therefore, even when the terminal 5 moves, the microcell base station that is always close to the terminal 5 is specified,
A high-speed data communication service can be provided, and the mobility of the terminal 5 using the high-speed data communication service can be improved.

Also, high-speed data communication service is provided only in the microcell base stations 1a and 1b having a small cell radius and a small propagation loss between the terminal and the base station, and have a large cell radius and a large propagation loss between the terminal and the base station. The central base station 3 performs only low-speed communication such as transmission and reception of voice and text data. Therefore, in the central base station 3 where the cell radius is large and the propagation loss to the terminal 5 is largely estimated, there is no need to perform high-speed data communication in which the signal power increases, so that even if the provided data communication service is speeded up, It is possible to suppress an increase in transmission power of the entire system.

Further, the central base station 3 specifies only the microcell base stations 1a and 1b that can provide the terminal 5 with the high-speed data communication service, and only the specified microcell base stations 1a and 1b control. With the configuration of notifying a signal and outputting a wireless signal to the terminal 5,
In response to a request from the terminal 5, it is possible to provide a high-speed data communication service by limiting the time and the area within the service area, thereby making effective use of wireless resources as a whole wireless communication system and other wireless communication. It is possible to reduce interference with the system.

In the first embodiment, the microcell base stations 1a and 1b and the central base station 3 do not need to provide a service to the terminal 5 using the same communication control method and the same frequency. A configuration using different communication control methods and different frequencies may be used. In this case, the terminal 5
Is provided in the connection control unit 13 with a multi-mode communication control function corresponding to a plurality of communication control methods, and by switching the corresponding communication control function according to the base station to be connected, or By using them in parallel, communication control for each base station is realized (multi-mode communication communication terminal).

Further, in the first embodiment, the position information creating section 12 creates the position information of the terminal 5 by the position information detecting function by the GPS, but the present invention is not limited to such a configuration, and the other information is not limited to this. A configuration in which the position information of the terminal 5 is created by a position information detection method may be employed.

For example, when the terminal 5 can receive control signals from a plurality of base stations, the position information creating section 12 determines the received signal level of each control signal and the base station identification information included in the control signal. And outputs information on the plurality of control signals as control signal reception information of the terminal 5. The central base station 3 sends the control signal reception information of the terminal 5 to the base station position information database 7, and inquires the terminal 5 of a microcell base station capable of providing a high-speed data communication service.

Next, the base station position information database 7
The terminal 5 reads the reception signal level of each control signal from the control signal reception information of the terminal 5 and compares the transmission power of each base station stored in the database with the reception signal level to calculate the propagation loss. And an inter-station distance between the base station and each base station. Further, the estimated inter-station distance from the terminal 5 to each base station is compared with the cell radius of each of the microcells 2a and 2b stored in the database.
, A microcell base station that can provide a high-speed data communication service, and outputs the same to the central base station 3. Even with the above configuration, the same effects as in the first embodiment can be obtained.

Embodiment 2 In the first embodiment, the terminal 5 transmits position information to the central base station 3, and the base station position information database 7 specifies the microcell base stations 1a and 1b that can provide the terminal 5 with the high-speed data communication service. However, in Embodiment 2, the central base station 3
The position of the terminal 5 is estimated by detecting the direction of arrival of the radio signal transmitted from, and the microcell base stations 1a and 1b capable of providing the high-speed data communication service are specified.
Embodiment 2 is different from Embodiment 1 only in that central base station 3 has a position estimating function for terminal 5, and other configurations are the same. The description is omitted.

FIG. 4 is a configuration diagram of the receiving unit of the central base station 3 according to the second embodiment. In FIG. 4, S is a reference signal which is a radio signal for position estimation transmitted from the terminal 5, θ is the arrival direction of the reference signal S, and 21 is a total of M antenna elements (# 1 to #M). An array antenna 22 is an analog-to-digital converter (hereinafter, referred to as an A / D) that converts a received signal output from each of the antenna elements into a digital signal, and 23 is an A / D2.
2, a direction detection unit for estimating the arrival direction θ of the radio signal S based on the output signals of the antenna elements output from the antenna elements 2, a reception intensity measurement unit 24 for measuring the reception intensity of the radio signal S, 25
Is a terminal position estimating unit for estimating the position of the terminal 5 from the estimated arrival direction θ and reception intensity of the radio signal, and 26 is a device in which positional information and propagation loss of a plurality of points in the macro cell 4 are recorded in advance. The propagation loss profile 27 is a base station control unit for making an inquiry about a microcell base station capable of providing a high-speed data communication service based on the estimated terminal location information.

Hereinafter, the operation of the wireless communication system according to the second embodiment configured as described above will be described. First,
The central base station 3 receiving the control signal including the request for the high-speed data communication service from the terminal 5 requests the terminal 5 to transmit a reference signal for position estimation. The terminal 5 that has received the control signal transmits the reference signal S including the known data sequence to the central base station 3 with a predetermined transmission output for a predetermined time. The transmission time and transmission output of the reference signal S are determined by the central base station 3 by the terminal 5.
A value necessary and sufficient for performing the position estimation processing is set in advance.

Next, the central base station 3 receives the reference signal S in the arrival direction θ by the array antenna 21. All M antenna elements constituting the array antenna 21 have different directivity patterns, respectively, receive the reference signal S, and output received signals. The received signal output from each antenna element is converted into digital signals X _{1 to} X _M by the A / D 22.

The received signals X _{1 to} X _M of the respective antenna elements are input to the direction detecting section 23. The direction-finding unit 23, based on the respective received signals X ₁ to X _M, for example, 'Multiple Emit
terLocation and Signal Parameter Estimation ',
MUSIC (MUltip), which is a direction finding algorithm described in Schmidt, IEEE Trans., AP34, 3, pp. 276-280 (1986).
The arrival direction θ of the reference signal S is estimated by using the “le SIgnal Classification” algorithm.

The reception intensity measuring section 24 outputs the reception signal X
_{1 to} X _M , the sum of the squares is calculated, the received signal strength of the reference signal S is measured, and the received signal strength and the transmission output of the reference signal S in the terminal 5 set in advance as described above are obtained. And the propagation loss from the terminal 5 to the central base station 3 is calculated.

On the other hand, in the design stage of the radio communication system, the position information of each reference point and the propagation loss of the reference signal S from each point to the central base station 3 are previously determined for a plurality of reference points in the macro cell 4. The measurement results are stored in the propagation loss profile 26 of the terminal position estimating unit 25. As described above, when the direction of arrival θ of the reference signal S is estimated by the direction detecting unit 23, the terminal position estimating unit 25 calculates the vicinity of the direction of arrival θ among all the reference points stored in the propagation loss profile 26. Only the reference points in are extracted.

Next, the terminal position estimating unit 25 sequentially compares the propagation loss from the terminal 5 calculated by the reception strength measuring unit 24 with the extracted propagation loss at the plurality of reference points, and A reference point whose loss difference is less than a predetermined threshold is specified, and the distance of the specified reference point from the central base station 3 is estimated as the distance of the terminal 5. Here, the threshold value of the propagation loss difference affects the accuracy of the distance estimation of the terminal 5, and a value small enough to perform the position estimation of the terminal 5 is determined in advance.

On the other hand, if none of the extracted reference points has a reference point whose propagation loss difference is smaller than the threshold value, the reference point of the transmission loss close to the value of the transmission loss from the terminal 5 is determined. Two are specified, and the interpolation processing is performed between the specified reference points to estimate the position of the terminal 5.
For example, assuming that the estimated propagation loss from the terminal 5 is L _MT and the propagation losses at the two specified reference points are L ₁ and L ₂ , the estimated position of the terminal 5 is obtained by the following equation (2).

(Equation 2)

Next, information on the estimated position of terminal 5 is output to base station control section 27. The base station control unit 27 sends the information on the estimated position to the base station position information database 7 via the communication network 6, and determines a microcell base station capable of providing the high-speed data communication service to the terminal 5. Ask.

Also, while the terminal 5 is connected to the microcell base station 1a or 1b to perform high-speed data communication, the central base station 3 determines the current position of the terminal 5 based on the radio signal of the terminal 5. Estimate and inquire the position to the base station position information database 7, and specify the microcell base stations 1a and 1b capable of providing the terminal 5 with the high-speed data communication service.

With such a configuration, in the wireless communication system according to the second embodiment, the central base station 3
By estimating the current position of the terminal 5 on the basis of the arrival direction and propagation loss of the radio signal from, the microcell base stations 1a and 1b capable of providing the high-speed data communication service are specified. Therefore, even if the terminal 5 does not detect the current position, the microcell base station 1 close to the terminal 5
Since a and 1b can provide a high-speed data communication service and the terminal 5 does not need to be equipped with a position information generating unit such as a GPS for detecting a current position, the terminal 5 can be reduced in size and power consumption can be reduced. Can be planned.

Also, while the terminal 5 is performing high-speed data communication, the central base station 3 estimates the current position of the terminal 5,
Since the microcell base stations 1a and 1b are specified, even when the terminal 5 moves, the microcell base station that is always close to the terminal 5 can be specified, and a high-speed data communication service can be provided. As in the first embodiment, it is possible to suppress an increase in the transmission power of the entire wireless communication system and increase the mobility of the terminal 5 using the high-speed data communication service.

In the second embodiment, the direction detecting unit 2
No. 3 estimated the arrival direction θ of the reference signal S transmitted from the terminal 5 using the MUSIC algorithm, but this is not limited to such a configuration. For example, 'ESPRIT-Estimation of Signal Parameters v
ia Rotation Invariance Techniques', Roy, Kailat
h, IEEE Trans., ASSP-37, 7, pp. 989-995 (198) ESPRIT algorithm, which is a direction finding algorithm described in, such as estimating the incoming signal θ using other direction finding algorithm It may be a configuration.

Further, when there is no reference point at which the propagation loss difference is smaller than the predetermined threshold, the terminal position estimating unit 25
Although the two reference points of the propagation loss closest to the magnitude of the propagation loss from the terminal 5 are specified and the interpolation processing is performed between the specified reference points, the number of the specified reference points is two. However, the present invention is not limited to this. For example, a configuration may be used in which three or more reference points are specified and interpolation processing is performed.

Embodiment 3 In the first embodiment, a plurality of microcell base stations 1a and 1b are arranged in the macrocell 4, and the microcell base stations 1a and 1b provide the terminal 5 with a high-speed data communication service. In the third embodiment, a plurality of repeaters for amplifying and retransmitting a data signal transmitted from the central base station 3 are arranged in the macro cell 4, and a high-speed data communication service for the terminal 5 is provided using the repeater. . The wireless communication system according to the third embodiment is different from the first embodiment only in that a high-speed data communication service is provided to the terminal 5 using the repeater. Other configurations are the same. Therefore, the same reference numerals are given and the description is omitted.

FIG. 5 is a configuration diagram of the radio communication system according to the third embodiment. In FIG. 5, reference numerals 30a and 30b denote repeaters that receive radio signals from the central base station 3 and provide high-speed data communication services.

Next, the operation of the radio communication system according to the third embodiment will be described. First, a plurality of repeaters 30a and 30b are arranged in a macro cell of the central base station 3, and micro cells 2a and 2b are deployed in each of them. Actually, a large number of repeaters are arranged in the macro cell 4 and the respective micro cells are spread out in a plane. However, in FIG.
Only a and 30b are shown.

In the wireless communication system, the terminal 5 communicates with the central base station 3 and the repeaters 30a and 30b, for example, in an OFDM (Orthogonal Frequency Division Multiplexer).
tiplexing (orthogonal frequency division multiplexing) Connects by a communication method. The OFDM communication method has an advantage that the frequency use efficiency is high and the multipath resistance is excellent. In such a communication system, the terminal 5 can receive a plurality of radio signals transmitted simultaneously from a plurality of base stations, respectively, and perform demodulation processing.

The terminal 5 is connected to the central base station 3, transmits and receives control signals, and controls communication for the radio communication system. Here, if there is a request for high-speed data communication from the user application of the terminal 5,
The connection control unit 13 transmits a control signal C ₁ including the position information of the terminal 5 and a request for a high-speed data communication service to the central base station 3.

Next, the central base station 3 having received the control signal C ₁ transmits the position information of the terminal 5 to the base station position information database 7 via the communication network 6 and transmits the high-speed data to the terminal 5. Inquire about repeaters that can provide communication services. As a result, the repeater 30a is identified, the central base station 3 performs the repeater 30a and the wireless connection, and transmits a control signal C ₂ which includes request for providing high-speed data communication service. Repeater 30a that has received the control signal C ₂ is broadcast a control signal to the micro-cell 2a, the terminal 5 starts the communication control with respect to the repeater 30a receives the control signal.

Next, the terminal 5 connects to the repeater 30a and starts high-speed data communication with the central base station 3 via the repeater 30a. First, the central base station 3 has several M to
To the terminal 5 at a high transmission rate of several tens of Mbit / s to transmit the signal C ₃ data. At this time, the central base station 3
In total transmission power Q _{ma x} allowed in the central base station 3
From the number k of the terminals 5 estimated to use the high-speed data communication service in the microcell 4, a transmission power Q _MT to be assigned to one terminal is determined in advance according to the following equation 3, and the high-speed data signal C3 is determined by the transmission power Q _{The message} is transmitted to the repeater 30a by _MT .

(Equation 3) Q _C is the transmit power of the central base station 3 that is required for communication other than the high-speed data communication services. In addition, the number of terminals k
Depends on the cell arrangement of the radio communication system, and an appropriate value is set in advance at the stage of the arrangement design of the macro cell 4.

Here, the transmission power Q _MT assigned to each terminal is defined as a decrease in transmission power per bit of transmission data due to an increase in communication speed and a propagation loss between the terminal 5 and the central base station 3. It is determined without depending on the maximum transmission power _Qmax allowed in the central base station 3. Therefore,
High-speed data signal C transmitted from the central base station 3
₃ is not always received by the terminal 5 with a radio field intensity sufficient for performing high-speed data communication even in the macro cell 4. On the other hand, the receiving amplifier to be mounted on the terminal 5, miniaturization of the terminal, for amplifying performance than limitation of the low power consumption is restricted, the signals C ₃ received at low received intensity,
It is difficult to amplify to a signal strength sufficient to perform high-speed data communication while maintaining a good SN ratio.

Next, the repeater 30a receiving the request for providing the high-speed data communication service from the central base station receives the high-speed data signal C ₃ transmitted from the central base station 3, and
Amplifies the signals C _3, and re-transmitted to the terminal 5 that is performing communication control between the repeater 30a. In addition,
Although in macrocell 4 are disposed a plurality of repeaters to other of the repeaters 30a, perform retransmission processing of the high-speed data signal C ₃ is a request for high-speed data communication services provided by the central base station 3 It is only received repeater 30a, the other repeater does not perform retransmission processing of the high-speed data signal C ₃ to the terminal 5.

In the retransmission processing by the repeaters 30a and 30b, the amplified signal retransmitted from the transmission antenna to the terminal 5 (hereinafter, referred to as a retransmission signal) wraps around to the reception antenna and is received. Transmission may occur in the retransmission signal, which may cause deterioration of reception performance in the terminal 5. Therefore, the repeaters 30a and 30b of the present embodiment
Then, the wraparound of the transmission signal (hereinafter referred to as a wraparound signal) is removed from the radio signal input from the receiving antenna.

[0088] In the following, a description will be given amplification and retransmission processing of the high-speed data signal C ₃ in repeater 30a. FIG. 6 is a configuration diagram of the repeaters 30a and 30b. In FIG. 6, reference numeral 31 denotes a receiving antenna for receiving a radio signal from the central base station 3, and 32 denotes the repeaters 30a and 30b.
, An auxiliary antenna 33 for receiving a wraparound signal (hereinafter referred to as a wraparound signal), an antenna canceller 33 for removing a wraparound signal having a large signal level from the reception signal of the reception antenna 31, and a 36 having a large signal level. A wraparound canceller that removes the remaining wraparound signal components from the received signal from which the wraparound signal has been removed and outputs a retransmission signal, 44 is a low distortion transmission amplifier that amplifies the retransmission signal, and 45 is retransmission after amplification. This is a retransmission antenna for transmitting a signal.

In the antenna canceller 33,
Reference numeral 34 denotes a phase / amplitude control unit for controlling the phase and amplitude of the reception signal of the auxiliary antenna 32, and reference numeral 35 denotes a combiner for combining the reception signal of the reception antenna 31 and the output of the phase / amplitude control unit 34.

In the wraparound canceller 36,
37, a delay time estimating unit for estimating a delay time of a loop signal component remaining in the combined signal output from the antenna canceller 33; 38, a memory for temporarily holding a retransmission signal; 39, a combined signal and the memory 38; A correlation processing unit for calculating a correlation value with the retransmission signal held in the transmission channel estimating unit for calculating a transmission channel estimation value from the correlation value;
Reference numeral 1 denotes a replica generation unit that generates an estimated copy (hereinafter, referred to as a replica signal) of the wraparound signal from the transmission path estimation value and the retransmission signal stored in the memory 38, and 43 outputs the replica signal to the This is a subtractor that subtracts from a received signal to generate a retransmission signal.

First, high-speed data signal C ₃ transmitted from central base station 3 is received by receiving antenna 31. Here, in addition to the signal C ₃ directly received from the central base station 3, the receiving antenna 31
_Circulating signal C _4r of the signal being retransmitted to The _wraparound signal C _4r causes oscillation due to amplification of the high-speed data signal in the repeater 30a, and causes deterioration of characteristics. Therefore, the repeater 30a, provided with a large auxiliary antenna 32 than directivity the reception antenna 31 with respect to the wraparound signal C _4r, receives the high speed data signal C ₃ at both the receiving antenna 31 and the auxiliary antenna 32 . The signals output from both antennas 31 and 32 are input to antenna canceller 33.

Next, the signal received by the auxiliary antenna 31 is
After the phase is adjusted between the received signal of the receiving antenna 31 by the phase / amplitude control unit 34, the received signal of the receiving antenna 31 is combined by the combiner 35. At this time, the phase / amplitude control unit 34 controls the amplitude and phase of the received signal of the auxiliary antenna 31 so as to minimize the signal power of the combined signal y output from the combiner 35. As a result, in the synthesized signal y, the signal level of the _wraparound signal C _4r is suppressed to a small level.

Next, the composite signal y output from the antenna canceller 33 is input to the wraparound canceller 36. The wraparound canceller 36 is described in, for example, "Study on terrestrial digital SFN repeater-like wraparound wave canceller" (Yamazaki et al., IEICE Technical Report, RCS200
0-64, by the method shown in Pp.89-94,2000-07) and, said sneak signal C _4r remaining in the synthesized signal y is removed, and outputs the retransmission signal u.

Next, the retransmission signal u output from the loop canceller 36 is amplified by the low distortion transmission amplifier 44 to a signal strength sufficient to provide a high-speed data communication service in the microcell 2a. You. here,
The low distortion amplifier 44 transmits the retransmission signal u transmitted from the central base station 3 at the transmission power Q _MT and extracted from the high-speed data signal C ₃ whose reception intensity has been reduced due to the propagation loss.
Has sufficient amplification performance to amplify the signal strength to a signal strength receivable by the terminal 5 while maintaining a good SN ratio.
Then, re-transmitting antenna 45, converts the retransmission signal after the amplification to a radio signal, and outputs to the terminal 5 as the retransmission signal C ₄ of the high-speed data.

On the other hand, the central base station 3 converts the radio signal from the terminal 5 into a high-performance signal having a sufficient amplification gain and NF to maintain a communicable signal level while maintaining a good SN ratio. A receiving amplifier is provided to directly receive uplink data from the terminal 5 and maintain data communication with the terminal 5.

The terminal 5 also transmits a control signal C ₁ containing the current position information to the central base station 3 even during high-speed data communication.
Send Central base station 3 receiving the control signal C ₁
Queries the base station location information database 7 for the location information of the terminal 5 and specifies the repeater that is close to the terminal 5. Therefore, even when the terminal 5 moves during high-speed data communication, a repeater that is always close to the terminal 5 is specified, and a high-speed data communication service can be provided via the repeater.

With this configuration, in the radio communication system according to the third embodiment, of the repeaters 30a and 30b arranged in the macro cell 4, only the repeater 30a close to the terminal 5 is connected to the central base station. station 3 performs retransmission processing of the high-speed data communication C ₃ transmitted from, providing high-speed data communication service. Therefore, it is possible to develop a micro cell capable of high-speed data communication only in the vicinity of the terminal 5 while limiting the transmission power of the central base station 3 accompanying the provision of the high-speed data communication service. It is possible to suppress an increase in transmission power of the entire wireless communication system.

Further, even during the high-speed data communication, the terminal 5 transmits the control signal C ₁ including the position information to the central base station 3, and the central base station 3 repeats the repeater 30 based on the position information.
Since a and 30b are specified, even when the terminal 5 moves, a repeater that is always close to the terminal 5 can be specified, a high-speed data communication service can be provided, and the terminal 5 using the high-speed data communication service can be provided. Mobility can be improved.

Further, the repeater 30a is a central base station.
3 high-speed data signal C transmitted from _ThreeAmplify and retransmit
With this configuration, high-speed data transmission
No need to amplify the signal with a large amplification rate
Power consumption, but amplification performance such as amplification gain and NF is limited
Realize high-speed data communication even with amplifiers
Can reduce the size of terminals and reduce power consumption.
You.

In the fourth embodiment, the terminal 5, the central base station 3, and the repeaters 30a and 30b
Although the description has been given of the case of connection using the M communication method, the wireless method between the terminal and the base station is not limited to this, and it is naturally possible to obtain the same effect with other connection methods. is there. For example, terminal 5 and each repeater 3
0a and 30b may be wirelessly connected by the CDMA system, and the terminal 5 may be configured to RAKE combine the wireless signals transmitted from the repeaters 30a and 30b, respectively. When the terminal 5 and the repeaters 30a and 30b are wirelessly connected using a single wireless carrier, each of the repeaters 30a,
While a predetermined time offset is given to each of the radio signals transmitted from the terminal 30b, the connection control unit 13 of the terminal 5 is provided with an adaptive equalization function, and a plurality of radio signals including the time offsets are received as diversity combined reception as multipath multiplexed signals. May be performed.

Embodiment 4 FIG. In the fourth embodiment, the terminal 5 that requests the high-speed data communication service determines the communication quality to be requested according to the moving speed of the terminal 5 and notifies the central base station 3 of the requested communication quality. Depending on
The micro cell base stations 1a and 1b are connected to the micro cells 2a and 2
By switching the size of b, a high-speed data communication service is provided. The fourth embodiment is different from the first embodiment only in that the micro cells 1a and 1b switch the size of the micro cell in accordance with the communication quality required by the terminal 5, and other operations are performed. In the following, the switching operation of the microcell size by the microcell base stations 1a and 1b will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

Here, “communication quality” handled in the embodiment of the present invention refers to the quality of data communication that fluctuates according to the frequency of base station switching of terminal 5. When the terminal 5 moves during high-speed data communication, it is necessary to switch a plurality of microcell base stations to maintain communication. Before and after the base station switching, the wireless connection is momentarily interrupted, and the continuity of data communication is lost. Therefore, when the frequency of base station switching increases, the communication quality deteriorates, and when the frequency of base station switching decreases, the communication quality improves.

Generally, the frequency of the base station switching depends on the terminal 5
Fluctuates depending on the area of the wireless cell of the base station to which is connected and the moving speed of the terminal 5. That is, when the moving speed of the terminal 5 during data communication is constant, the larger the area of the wireless cell, the lower the frequency of base station switching, and as a result, the communication quality can be improved. On the other hand, when the area of the wireless cell is constant, the higher the moving speed of the terminal, the more frequently the base station is switched, and the lower the communication quality.

FIG. 7 is a configuration diagram of a radio communication system according to the fourth embodiment. In FIG. 7, reference numeral 50a denotes an enlarged micro cell developed by the micro cell base station 1a. FIG. 8 is a configuration diagram of the terminal 5 according to the fourth embodiment. In FIG. 8, reference numeral 51 denotes a communication quality determining unit which determines the size of a cell radius required when performing high-speed data communication;
Reference numeral 2 denotes a moving speed detecting unit that detects the moving speed of the terminal 5.

Next, the operation of the radio communication system according to the fourth embodiment will be described. In the fourth embodiment, each of the microcell base stations 1a and 1b switches the transmission power of the signal so that the microcell 2a having the normal cell radius can be used.
2b and the microcell 50a whose cell radius is enlarged can be switched and developed. In FIG. 7, only the enlarged microcell 50a developed by the microcell base station 1a is shown for simplicity, but the microcell base station 1b is similarly expanded by switching the transmission power. Can be expanded. FIG.
Although only the microcell base stations 1a and 1b are shown therein, a plurality of microcell base stations are actually arranged in the macrocell 4 in addition to these, and each microcell base station is High-speed data communication service can be provided by switching the cell radius of the microcell.

In the terminal 5, when the communication speed judging section 11 judges that high-speed data communication is required, the connection control section 13 sends the position information creating section 12 to the terminal 5 as described above.
And inquire of the required quality determination unit 51 whether it is necessary to request the expansion of the expanded micro cell in order to maintain the high-speed data communication. In the following, the request for expanding the microcell is referred to as “high-quality communication request”.

Next, the quality judging section 51 which received the inquiry detects the moving speed of the terminal via the moving speed detecting section 52. For example, when the terminal 5 is mounted on an automobile, the traveling speed detecting unit 52 is connected to a speedometer of the automobile, and the detected value of the speedometer is used as the traveling speed of the terminal 5 to determine the required quality. Notify.

On the other hand, a threshold value of the moving speed for determining whether a high quality communication request is required is stored in the quality determining section 51 in advance. When the terminal 5 moves at high speed during high-speed data communication, it is desirable to increase the area of the microcell and reduce the frequency of base station switching as much as possible. Therefore, the requested quality determination unit 51 that has received the notification of the moving speed compares the moving speed with the threshold and determines whether a high-quality communication request for the wireless communication system is necessary. For example, the threshold value of the moving speed at which a high quality requirement is required is set to 20 km / h, and the moving speed of the terminal 5 notified by the moving speed detecting unit 52 is set to 3
If it is 0 km / h, the required quality determination unit 51 determines that the terminal 5 is moving at a high speed, and sends a high quality communication request to the connection control unit 13. On the other hand, when the terminal 5 is stopped or moving at a low speed, and the moving speed of the terminal 5 is lower than the threshold value (20 km / h), the required quality determination unit 51 Do not send a high quality communication request to it. Hereinafter, a case where a high quality communication request is generated from the required quality determination unit 51 will be described.

Next, the connection control section 13 creates a control signal including a request for a high-speed data communication service, the position information of the terminal 5 and a high-quality communication request, and transmits the control signal to the central base station 3. Next, the central base station 3 transmits the position information of the terminal 5 via the communication network 6 to the base station position information database 7.
And specifies the microcell base station 1a capable of providing the terminal 5 with the high-speed data communication service.

Next, the central base station 3 provides the specified microcell base station 1a with the high-quality communication request transmitted from the connection control unit 13 of the terminal 5 and provides the high-speed data communication service. Request. The microcell base station 1a that has received the request increases the transmission power as compared with the time of providing the normal high-speed data communication service, and starts broadcasting a control signal in the expanded microcell 50a. Further, the microcell base station 1a transmits the cell radius of the enlarged microcell base station 50a and the increased transmission power to the base station position information database 7 via the communication network 6, and the above-described FIG. Of the microcell base station 1a shown in FIG.

Next, the terminal 5 communicates with the microcell base station 1
The control signal transmitted from the microcell base station 1a is received, and communication control is performed on the microcell base station 1a to start high-speed data communication. Here, when performing high-speed data communication while moving with the terminal 5, since the microcell base station 1a expands the enlarged microcell 50a, the time during which the connection with the microcell base station 1a can be maintained is: It is longer than a normal microcell 2a. Therefore, the moving terminal 5
The number of times the base station is switched during the high-speed data communication is reduced, and the communication quality of the high-speed data communication is improved.

On the other hand, the microcell base station 1a notifies the terminal 5 that the provision of the high-speed data communication service has been started by the expanded microcell 50a to the user charging database 8 via the communication network 6. Send. The user charging database 8 records the start time of high-quality high-speed data communication by the terminal 5.

FIG. 9 is an explanatory diagram showing an example of recording in the user billing database 8. User billing database 8
Shows the communication start time and the communication end time of the terminal 5 connected to the wireless communication system, classified and recorded for each used service. For example, in FIG. 9, the communication time of the terminal 5 is “low-speed communication” in which voice or low-speed data communication is performed with the central base station 3, or within the normal microcells 2 a and 2 b of the microcell base stations 1 a and 1 b. "High-speed communication" that performed high-speed data communication with the micro-cell 5
The service is classified into three services of “high-quality / high-speed data communication” in which high-speed data communication is performed within 0a, and communication start and end times are recorded for each of the three services.

Further, the connection control unit 13 of the terminal 5 can perform the high quality data communication with the micro cell base station 1a during the high quality data communication.
A control signal including a high-quality communication request and position information is periodically transmitted to the central base station 3. The central base station 3 receives the position information transmitted from the terminal 5 and inquires the base station position information database 7 to inquire about a microcell base station capable of high-speed data communication service. At this time, the information on the microcell base station 1a deploying the expanded microcell 50a reflects the expanded cell radius of the microcell 50a and the increased transmission power of the microcell base station 1a. In consideration of the situation where the expanded micro cell 50a is deployed, the micro cell base station is specified, and while the terminal 5 is present in the expanded micro cell 50a, The microcell base station 1a is specified as a microcell base station that can provide a high-speed data communication service. Further, when the terminal 5 continues to move and moves out of the enlarged micro cell 50a, the central base station 3 and the base station position information database 7
A request for providing a high-speed data communication service accompanied by the high-quality communication request is specified by specifying another microcell base station.

Next, when the terminal 5 terminates the high-speed data communication, the microcell base station 1a notifies the user via the communication network 6 that the terminal 5 has finished using the high-quality high-speed data communication service. This is transmitted to the charging database 8. In the user billing database 8,
The end time of the high quality / high speed data communication by the terminal 5 is recorded. Further, the microcell base station 1a stops transmitting the radio signal, and the microcell base station 1a recorded in the base station position information database 7.
The information on a is reset to the normal cell radius and transmission power of the microcell 2a.

The user charging database 8 totals the total communication time for each service based on the record of the communication start / end time of each service. Further, the communication charge of the terminal 5 is calculated by multiplying the total communication time of each service by a usage charge per a predetermined unit time. For example, in the example of the recording of the user billing database 8 shown in FIG. 9 described above, a different usage fee per unit time is stored in advance for each service, and the user billing database 8 is stored for each service. The communication fee for each communication service is sequentially calculated by separately multiplying the calculated transmission time by the usage fee per unit time. The service provider of the wireless communication system charges the user of the terminal 5 the total communication fee of each service. In this way, by setting a different usage fee per unit time for each service, a communication fee according to the content of the used service is charged to the user of the terminal.

In the above description, the case where a high quality communication request is generated by the required quality determination unit 51 of the terminal 5 has been described.
1 does not generate a high-quality communication request, the microcell base stations 1a and 1b as in the first embodiment.
Expands the micro cells 20a and 20b having a normal cell radius and provides a high-speed data communication service to the terminal 5.

With this configuration, in the wireless communication system according to the fourth embodiment, terminal 5 using the high-speed data communication service determines whether or not a high-quality communication request is required, and as a result of the determination, When a quality communication request is issued, the microcell base stations 1a and 1b deploy the expanded microcell 50a and provide a high-speed data communication service to the terminal 5. Accordingly, for example, when the base stations are frequently switched in the micro cells 2a and 2b having a small cell radius and the quality of high-speed data communication is expected to deteriorate, such as when the terminal moves at high speed, the expanded micro cell base station 50a is used. A high-speed data communication service can be provided, and mobility of a terminal using the high-speed data communication service can be improved.

Also, only when a request for a high-speed data communication service accompanied by the high-quality communication request is generated from the terminal 5, only the microcell base station 1a adjacent to the terminal 5 deploys the expanded microcell 50a. To provide a high-speed data communication service, and when the terminal 5 is stopped or moving at a low speed, for example, the microcell base station 1a,
If the quality degradation of the high-speed data communication due to the switching of 1b does not matter, the microcell 2a having a small cell radius,
2b provides a high-speed data communication service. Therefore, it is possible to suppress an increase in the transmission power of the microcell base stations 1a and 1b accompanying the provision of the high-quality high-speed data communication service, and to reduce the transmission power of the entire wireless communication system.

Further, the user charging database 8 calculates the total communication time of the terminal 5 separately for each service provided by the wireless communication service. Therefore, it is possible to calculate the usage fee to be charged to the user according to the total communication time for each service, and the convenience of charging management of the terminal belonging to the wireless communication system is enhanced.

In the fourth embodiment, each microcell base station 1a, 1b is connected to a normal microcell 2a,
In addition to 2b, the high-speed data communication service was provided by expanding the expanded microcell 50a. However, the cell radius of the microcell is not limited to the above two types, and each microcell base station 1a, 1b May be configured to develop three or more types of microcells having different cell radii. In this case, information specifying the type of cell radius is transmitted in the high quality communication request transmitted from the terminal 5,
Each microcell base station 1a, 1b switches the cell radius of the microcell according to the information.

Further, in Embodiment 4, position information is created in terminal 5 requesting a high-speed data communication service, and microcell base stations 1a and 1b close to terminal 5 are specified based on the position information. However, the specific method of the microcell base station is not limited to this. For example, as described in the second embodiment, the position of the terminal 5 is estimated in the central base station 3,
Based on the estimation result, the micro cell base stations 1a, 1
A configuration for specifying b may be used.

Further, in the fourth embodiment, the moving speed detecting section 52 of the terminal 5 detects the moving speed by being connected to a speedometer of an automobile or the like, but this is limited to such a configuration. Instead, for example, a configuration may be used in which the time difference value of the position information detected by the position information creating unit 12 is calculated to estimate the moving speed of the terminal 5.

Further, the required quality judgment section 51 of the terminal 5
Determined the necessity of a high-quality communication request in accordance with the moving speed detected by the moving speed detecting unit 52, but this is not limited to such a method, and the expanded microcell 50a Other methods for determining whether or not it is preferable to use a high-quality high-speed data communication service may be used. For example, the terminal 5
The request quality determination unit 51 may determine that a high-quality communication request is required when an explicit request is made from a user of the above.

Further, the user billing database 8 includes:
The usage fee to be charged to the user is calculated based on the total usage time for each service. However, the calculation method of the usage fee is not limited to this. For example, for each service, the terminal 5 and the base station 1a , 1b, and 3 are recorded, the total amount is calculated, and the usage fee charged to the user is calculated according to the calculated total data amount for each service. It may be.

Embodiment 5 FIG. In Embodiment 4 described above,
Although the microcell base stations 1a and 1b have expanded the microcell 50a in response to a request from the terminal 5 and provided a high-speed data communication service, the fifth embodiment provides a high-speed data communication with a high-quality communication request. Only when a service request is generated from the terminal 5, a microcell base station existing within a predetermined distance from the terminal 5 is specified, and a high-speed data communication service is provided from all the specified microcell base stations. I do.

The radio communication system according to the fifth embodiment differs from the fourth embodiment only in that a high-speed data communication service is provided from all microcell base stations within a predetermined distance from the terminal 5. Are different, and the other communication control methods are exactly the same. Therefore, in the following, a method for specifying a microcell base station and a method for providing a high-speed data communication service will be described, and a description of other communication control methods will be omitted. . Further, the same components as those of the fourth embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 10 is an explanatory diagram showing a state of providing a high-speed data communication service of the microcell base station in the radio communication system according to the fifth embodiment. In FIG. 10, reference numerals 1a to 1e denote microcell base stations that provide high-speed data communication services, 2a to 2e denote microcells deployed by the microcell base stations 1a to 1e, and 55 denotes an area at a predetermined distance from the terminal 5. .

Next, a method for providing a high-speed data communication service according to the fifth embodiment will be described with reference to FIG. First, the central base 3 (not shown in FIG. 10) that has received a control signal of a connection request including a high-speed data communication request, a high-quality communication request, and location information from the terminal 5 transmits the high-quality communication request and the location information. Is read out and transmitted to the base station position information database 7 (not shown in FIG. 10) via the communication network 6.

On the other hand, the base station position information database 7
Stores a distance R that defines the peripheral area 55 of the terminal 5 to be considered for specifying the microcell base station when a high-speed data communication request accompanied by a high-quality communication request occurs. The base station position information database 7, which has received the high quality communication request and the position information of the terminal 5 from the central base station 3, stores the position information of the terminal 5 and the positions of all the microcell base stations stored in the database. Based on the information, all microcell base stations within the distance R from the terminal 5 are specified. For example, in FIG. 10A, when the terminal 5 is located at the point X, all the microcell base stations 1a to 1d included in the area 55 at a distance R from the point X are specified. All the microcell base stations 1a to 1d specified in this way are notified to the central base station 3 via the communication network 6.

Here, the distance R defining the peripheral area 55 is set in advance by measurement to a value large enough for the terminal 5 moving at high speed to maintain the communication quality of high-speed data communication. It is assumed that the information is stored in the information database 7. For example, each of the microcells 2a to 2e
If a single microcell base station 1a to 1e provides a high-speed data communication service to a terminal 5 that moves at high speed when the cell radius of the cell is about 100 m, switching processing between microcell base stations frequently occurs. The communication quality of high-speed data communication deteriorates. Therefore, the microcells 2a to
Terminal 5 that is sufficiently larger than the cell radius of 2e and moves at high speed
The distance R sufficient to maintain the communication quality of high-speed data communication is measured in advance by experiments and simulations. As a result of the measurement, when the distance R is set to, for example, 1 km, the distance R (= 1 km) around the terminal 5 is set.
All the microcell base stations within the area 55 are specified.

Next, the central base station 3 requests all the specified microcell base stations 1a to 1d to provide a high-speed data communication service to the terminal 5. Each of the microcell base stations 1a to 1d receiving the request establishes synchronization between the microcell base stations via the communication network 6, and then starts reporting control signals to the respective microcells 2a to 2d. The terminal 5 receives a control signal transmitted from each of the microcell base stations 1a to 1d, performs communication control processing such as synchronization establishment and wireless control, and starts high-speed data communication.

During the high-speed data communication, the specified microcell base stations 1a to 1d each transmit a high-speed data signal to the terminal 5 while maintaining synchronization between the microcell base stations. The high-speed data signals transmitted from each of the microcell base stations 1a to 1d are respectively received and combined. For example, when the terminal 5 is connected to each microcell base station by the CDMA method, the specified microcell base stations 1a to 1d are:
The high-speed data signal spread by the same spreading code is transmitted to the terminal 5 while maintaining synchronization between the base stations. The terminal 5 receives a plurality of high-speed data signals transmitted from each microcell base station and performs RAKE combining.

The terminal 5 transmits a control signal including the position information of the terminal and a high-quality communication request to the central base station 3 even while performing high-speed data communication with the microcell base stations 1a to 1d. Send. For example, as shown in FIG. 10B, when the terminal 5 moves from the point X to the point Y during the high-speed data communication, the terminal 5 transmits the position information of the destination point Y and the high-quality communication request. Is transmitted to the central base station 3.

The central base station 3 having received the control signal,
The location information of the point Y to which the terminal 5 is moved and the high quality communication request are transmitted to the base station location information database 7. In the base station position information database 7 receiving these information, the area 55 is newly defined for the point Y, the microcell base stations 1c to 1e existing inside the area 55 are specified, and the central base station Notify 3. Next, based on the notification, the central base station 3 requests the newly specified microcell base station 1e to provide a high-speed data communication service, and at the same time, the specific selection by the base station position information database 7 is performed. The micro cell base stations 1a and 1b are instructed to stop providing the high-speed data communication service.

Next, the microcell base station 1e newly requested to provide the high-speed data communication service becomes the microcell base station 1 already providing the high-speed data communication service.
After establishing synchronization with c and 1d, transmission of a high-speed data signal to the terminal 5 is started. The terminal 5 receives and combines the high-speed data signals transmitted from the newly specified microcell base stations 1c to 1e, respectively.

The above-described method of selecting a microcell base station and providing a high-speed data communication service is performed only when the high-speed data communication request generated from the terminal 5 includes a high-quality communication request. In contrast, the terminal 5
For example, when the terminal 5 is stationary or moving at a low speed, and the high-speed data communication request from the terminal 5 does not include a high-quality communication request, the terminal 5 And the microcell base stations 1a to 1e stored in the base station position information database 7 in the previous period.
Based on the location information, a microcell base station capable of providing the high-speed data communication service to the terminal 5 is specified,
A high-speed data communication service is provided only by the specified microcell base station.

With such a configuration, in the wireless communication system of the fifth embodiment, when a high-speed data communication request accompanied by a high-quality communication request is generated from terminal 5,
Is transmitted from all the microcell base stations in the predetermined area 55 containing the data, and the terminal 5 receives and combines them, so that the terminal 5 moves at a high speed. However, the communication quality of the high-speed data communication can be maintained, and the mobility of the terminal 5 using the high-speed data communication service can be improved.

Only when a request for a high-speed data communication service including a high-quality communication request is generated from the terminal 5, the high-speed data communication service is transmitted from all the microcell base stations in the predetermined area 55 including the terminal 5. When a data signal is transmitted and a request for a high-speed data communication service that does not include a high-quality communication request occurs, a high-speed data communication service is provided to the terminal 5 only by a microcell base station capable of providing the high-speed data communication service. I do. Therefore, it is possible to suppress an increase in transmission power of the entire wireless communication system due to provision of a high-quality high-speed data communication service.

In the fifth embodiment, the terminal 5 that requests the high-speed data communication service creates position information, and based on the position information, generates all microcells in the predetermined area 55 including the terminal 5. Although the base station has been specified, the method of specifying the microcell base station is not limited to this. For example, as described in the second embodiment described above, the The configuration may be such that the position is estimated, and all microcell base stations in the predetermined area 55 including the terminal 5 are specified based on the estimation result.

In the fifth embodiment, the distance R defining the peripheral area 55 of the terminal 5 is a value specified as a result of measurement in advance by experiment or simulation, and is stored in the base station position information database 7 in advance. However, the present invention is not limited to such a configuration. For example, when requesting high-speed data communication in the terminal 5, the size of the distance R is determined according to the moving speed of the terminal 5, and the high-speed data The control signal of the communication request includes the distance R and transmits the information to the central base station 3. The central base station 3 reads out the information and transmits the information to the base station position information database 7. Is the distance R determined by the terminal 5
May be configured to specify all the microcell base stations within the area 55 defined by. In such a configuration, the size of the area 55 defined by the distance R can be switched according to the moving speed of the terminal. For example, when the moving speed of the terminal 5 is high, the distance R is set to be large. By doing so, it is possible to increase the number of microcell base stations that provide high-speed data communication services and maintain communication quality of high-speed data communication during high-speed movement.

In the fifth embodiment, the case where the terminal 5 is connected to each of the microcell base stations 1a to 1e by the CDMA method has been described, but the connection between the terminal 5 and the microcell base stations 1a to 1e is described. The system is not limited to the CDMA system, and it is naturally possible to obtain the same effect with other connection systems. For example, when the terminal 5 and each of the microcell base stations 1a to 1e are connected by the TDMA method, each of the microcell base stations 1a to 1e transmits a high-speed data signal to the terminal 5 at a different TDMA slot timing, Even if the terminal 5 is configured to receive and combine these high-speed data signals at each TDMA slot timing, the same effect as in the fifth embodiment can be obtained.

Embodiment 6 FIG. In the sixth embodiment, when the terminal 5 needs higher-speed and large-capacity data communication than the high-speed data communication service provided by each microcell base station, the terminal 5 is located near the terminal 5. The plurality of microcell base stations 1a to 1c perform bulk transmission of high-speed and large-capacity data to the terminal 5, and the terminal 5 receives data signals transmitted from the plurality of microcell base stations 1a to 1c, respectively, and transmits them. Perform high-speed, large-capacity data communication by combining. Hereinafter, the high-speed bulk transmission of large-capacity data by the plurality of microcell base stations is referred to as “multi-station multiplex transmission”. The radio communication system according to the sixth embodiment differs from the fifth embodiment in that the micro cell base station 1a
1c and the terminal 5 are different only in that high-speed and large-capacity data communication is performed. Hereinafter, a method of high-speed and large-capacity data communication in the wireless communication will be described. Further, the same components as those in the above-described fifth embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 11 is a configuration diagram of a radio communication system according to the sixth embodiment. In FIG. 11, reference numeral 60 denotes a microcell base station controller that controls each of the microcell base stations 1a to 1c to perform high-speed and large-capacity data communication with the terminal 5.

Next, the operation of the radio communication system according to the sixth embodiment will be described. First, in the terminal 5, when a request for data communication occurs from the user application,
The communication speed determination unit 11 requests the user application for a low-speed data communication service provided by the central base station 3 or a high-speed data communication service provided by each of the microcell base stations 1a to 1c. Is requested, or an inquiry is made as to whether a higher-speed and larger-capacity data communication is required than these data communication services.

When a low-speed data communication service is requested from the user application in response to the inquiry, the communication control unit 13 establishes a wireless connection with the central base station 3 by the above-described method to perform low-speed communication. Start data communication. When a request for a high-speed data communication service is made, the communication control unit performs wireless connection with the microcell base stations 1a to 1c located near the terminal 5 by the above-described method to perform high-speed data communication. To start.

Next, from the user application,
If there is a request for higher-speed and larger-capacity data communication than the high-speed data communication service provided by each of the microcell base stations 1a to 1c, the connection control unit 13 sends a high-speed A control signal for requesting large-capacity data communication is transmitted. At this time, the requested data communication speed is specified from the user application, and the control signal requesting the high-speed and large-capacity data communication includes information indicating the requested data communication speed and is transmitted. Next, the central base station 3 transmits a control signal for requesting the high-speed large-capacity data communication to the microcell base station controller 60 via the communication network 6.

Next, the microcell base station controller 60 that has received the control signal requesting the high-speed and large-capacity data communication.
Requests the base station location information database 7 to specify a microcell base station capable of providing the terminal 5 with the high-speed data communication service. FIG. 12 is an explanatory diagram showing a state of providing a high-speed large-capacity data communication service in the wireless communication system according to the sixth embodiment. For example,
As shown in FIG. 12, when the microcell base stations 1 a to 1 c exist near the terminal 5, the base station position information database specifies these and replies to the microcell base station control device 60. Further, each of the microcell base stations 1a to 1c is a microcell 5 expanded as described above.
When 0a to 50c can be developed, the base station position information database 7 specifies the microcell base station in consideration of these cell radii.

Next, the microcell base station control unit 60
It inquires each of the specified microcell base stations 1a to 1c whether or not a high-speed data communication service can be provided. Each of the microcell base stations 1a to 1c provides a high-speed data communication service to the terminal 5 because the high-speed data communication service is already provided to another terminal (not shown in FIGS. 11 and 12). Is not provided, the microcell base station controller 60
To that effect. On the other hand, when each of the microcell base stations 1a to 1c can provide a high-speed data communication service to the terminal 5, the microcell base station controller 60 replies to the microcell base station controller 60.

The microcell base station controller 60, which has received a response from each of the microcell base stations 1a to 1c indicating whether or not the high-speed data communication service can be provided, sets the microcell base stations 1a to 1c capable of providing the high-speed data communication service. Calculate the sum of the communication speeds. For example, in the wireless communication system, each microcell base station can provide a high-speed data communication service of 20 Mbit / sec to one terminal, and can provide the service.
In the case of three stations a to 1c, the maximum communication speed of the high-speed large-capacity data communication service that can be provided to the terminal 5 by multi-station multiplex transmission using these microcell base stations 1a to 1c is 60 Mbit / sec. Becomes At this time, if there is a microcell base station that cannot provide a high-speed data communication service among the microcell base stations 1a to 1c, the microcell base station control unit 60 cannot provide the service. The sum of the communication speeds is calculated excluding the communication speed of the microcell base station.

Next, the microcell base station control device 60
Comparing the requested data communication speed transmitted from the terminal 5 with the maximum available communication speed (60 Mbit / sec), if the maximum available communication speed is higher than the required data communication speed, A control signal including information indicating that a high-speed and large-capacity data communication service can be provided and information specifying the microcell base stations 1a to 1c that provide the service.
It transmits to the terminal 5 via the communication network 6 and the central base station 3. The connection control unit 13 of the terminal 5 receives the control signal and starts a communication control process for the microcell base stations 1a to 1c.

The micro cell base station controller 60
Requests the microcell base stations 1a to 1c to provide a data communication service to the terminal 5 by multi-station multiplex transmission. Each of the microcell base stations 1a to 1c receiving the request establishes synchronization with each other via the communication network 6, and then starts broadcasting control signals in the enlarged microcells 50a to 50c as shown in FIG. I do.

Next, the terminal 5 and each microcell base station 1a
Is established, the microcell base station control device 60 divides large-capacity data for the terminal 5 and transmits the divided data to the microcell base stations 1a to 1c.
Each of the microcell base stations 1a to 1c transmits the divided data into the enlarged microcells 50a to 50b while securing synchronization between the microcell base stations already established.

Next, the terminal 5 receives all the data signals transmitted from the respective microcell base stations 1a to 1c and combines them. For example, when the terminal 5 and each of the microcell base stations 1a to 1c are communicating by the CDMA method, the terminal 5 is connected to the microcell base station 1a.
To 1c are transmitted to RA
By KE combination, large-volume data before division is obtained.

The micro cell base station control device 60
Notifies the user charging database 8 via the communication network 6 of the start / end of use of the high-speed and large-capacity data communication service by the terminal 5 and the communication speed of the data communication service used by the terminal 5; 8 records the start and end of use of the service and the communication speed, and calculates the communication fee of the high-speed and large-capacity data communication service.

On the other hand, the requested data communication speed transmitted from the terminal 5 and the maximum available communication speed (60 Mbit /
If the maximum communication speed that can be provided is lower than the requested data communication speed, the microcell base station controller 60 provides the data communication service at the requested communication speed. Transmits a control signal containing information indicating that transmission is impossible and information indicating the maximum communication speed that can be provided to the terminal 5 via the communication network 6 and the central base station 3. Next, in the terminal 5, the communication speed determination unit 11 inquires of the user application that has generated the data communication request whether to perform data communication at the maximum available communication speed.

As a result, when there is a request to use the high-speed large-capacity data communication service at the maximum communication speed that can be provided, the connection control unit 13 performs control to use the high-speed large-capacity data communication service. The signal is transmitted to the microcell base station 60 via the central base station 3 and the communication network 6, and the microcell base stations 1a to 1
c, high-speed large-capacity data communication by multi-station multiplex transmission is performed.

On the other hand, in the terminal 5, when the user application replies to the communication speed judging unit 11 that the data communication at the maximum available communication speed is not requested, the communication control is performed. The unit 13 transmits a control signal to the effect that the high-speed large-capacity data communication service is not used to the microcell base station 60. At this time, if there is a request from the communication speed determination unit 11 to use the low-speed data communication service provided by the central base station 3 or the high-speed data communication service provided by one microcell base station, the connection is established. The control unit 13 controls the central base station 3 or the microcell base stations 1a to 1 by the above-described method.
The data communication is performed with any one of c.

As described above, the radio communication system according to the sixth embodiment includes the microcell base station control device 60 which controls the plurality of microcell base stations 1a to 1c and performs large-capacity data communication with the terminal 5. , A plurality of microcell base stations 1
By providing multi-station multiplex transmission of large-capacity data using a to 1c, terminal 5 is provided with a higher-speed and larger-capacity data communication service than the high-speed data communication service provided by one microcell base station. can do.

The high-speed and large-capacity data communication service is provided by the micro cell base stations 1 a to 1 c near the terminal 5.
Therefore, an increase in transmission power of the entire wireless communication system required for providing a high-speed and large-capacity data communication service can be suppressed to a minimum.

Further, when a request for using the data communication service is received from the terminal 5, the maximum communication speed that can be provided based on the radio resources available in each microcell base station is calculated, and the range of the maximum communication speed is calculated. The provision of high-speed, large-capacity data communication services within the network allows data communication services to be provided at the optimum communication speed without disturbing data communication services provided to other terminals. Is possible, and the convenience of the wireless communication system can be improved.

In the radio communication system according to the sixth embodiment, terminal 5 and each of microcell base stations 1a-1c are CD
The wireless connection is performed by the MA method, and the terminal 5 is connected to the microcell base station 1
Although the configuration in which the radio signals transmitted from each of a to 1c are RAKE-combined and large-capacity data transmitted by multi-station multiplexing are combined has been exemplified, this is not limited to such a configuration. Another configuration for combining and receiving data transmitted by multi-station multiplexing from the cell base station may be employed.

For example, each of the microcell base stations 1a to 1c
Multiplex transmission of large-capacity data using a single wireless carrier, the microcell base stations 1a to 1c
Are given a predetermined time offset. On the other hand, the configuration may be such that the connection control unit 13 of the terminal 5 is provided with an adaptive equalization function and performs diversity combining reception using a plurality of data signals including the time offset as a multipath multiplexed signal. Also, in a multi-carrier system in which each of the microcell base stations 1a to 1c wirelessly connects to the terminal 5 using a plurality of radio carriers, the terminal 5 having the adaptive equalization function transmits from each of the microcell base stations. A configuration may also be adopted in which the data signal obtained is diversity-combined and received as a multipath multiplexed signal.

In the sixth embodiment, when the maximum communication speed that can be provided is higher than the required data communication speed, the microcell base station controller 60 is specified by the base station position information database 7. , Microcell base stations 1a-1 capable of providing high-speed data communication services
c, multi-station multiplex transmission of large-capacity data was performed. However, this is not limited to such a configuration, and a necessary and sufficient number of microcell base stations satisfying the required data communication rate are used. Alternatively, the configuration may be such that multi-station multiplex transmission of large amounts of data is performed.

For example, if the requested data communication speed is 40 Mbi
t / sec, the maximum communication speed that can be provided is 60 Mbit / sec, and the communication speed per microcell base station is 20
In the case of Mbit / sec, the microcell base station controller 60 selects any two of the microcell base stations 1a to 1c capable of providing the high-speed data communication service, and performs high-speed transmission at the requested data communication speed. It may be configured to provide a large capacity data communication service. With such a configuration, it is possible to further suppress an increase in transmission power of the entire wireless communication system required for providing a high-speed and large-capacity data communication service.

Embodiment 7 FIG. In the seventh embodiment, when a data communication request is generated from the terminal 5, the communication speed of each data communication service that can be provided by the central base station 3 and the microcell base stations 1a to 1e is notified to the terminal 5.
The user of the terminal 5 selects a data communication service to be actually used based on the communication speed. The wireless communication system according to the seventh embodiment is different from the wireless communication system according to the above-described sixth embodiment in that the base station position information database 7 extracts a data communication service that can be provided to the data terminal 5, and
Only the point of notification is different, and the other communication control processing is the same. Hereinafter, only the notification of the data communication service that can be provided to the terminal 5 and the processing of selecting the data communication speed by the terminal 5 will be described. . Further, the same components as those in the above-described sixth embodiment are denoted by the same reference numerals, and description thereof is omitted.

First, when a request for data communication is generated from the user application of the terminal 5, the communication speed determination unit 11
Requests the connection control unit 13 for an available data communication speed. Next, the connection control unit 13 acquires the current position information of the terminal 5 via the position information creation unit 12 and inquires of the central base station 3 about a data communication service including the current position information of the terminal 5. Is transmitted.

Next, the central base station 3 makes an inquiry to the base station position information database 7 for a data communication service that can transfer and provide the position information of the terminal 5. next,
The base station position information database 7 specifies a microcell base station capable of providing a high-speed data communication service to the terminal 5 based on the position information of the terminal 5.

When a plurality of microcell base stations capable of providing the high-speed data communication service to the terminal 5 are specified, the base station position information database 7 stores the specified plurality of microcell base stations in the microcell base station. It notifies the station controller 60 and inquires about the maximum communication speed of a high-speed and large-capacity data communication service that can be provided when multi-station multiplex transmission is performed via the specified plurality of microcell base stations.

Next, the base station position information database 7
The communication speed of the low-speed data communication service by the central base station 3, the communication speed of the high-speed data communication service by each of the specified microcell base stations, and the multi-station multiplex calculated by the microcell base station controller 60. A control signal including the maximum communication speed of the high-speed large-capacity data communication service by transmission is transmitted to the terminal 5 via the central base station 3.

Next, the communication speed judging section 11 of the terminal 5 notifies the communication speed of each data communication service transmitted from the base station position information database 7 to the user application which has requested the data communication. The user application selects a data communication service to be actually used based on the communication speed of each of the available data communication services, and answers the communication speed determining unit 11. Next, the communication speed judging unit 11 requests the connection control unit 13 to start using the data communication service selected by the user application, and the terminal 5 and the central base station 3 to the microcell base stations 1a to 1e. Data communication is started between and.

As described above, according to the seventh embodiment, when a data communication request is issued from terminal 5, data communication services that can be provided to terminal 5 are extracted, and the communication speed of each extracted data communication service is extracted. , The user selects an optimal data communication service. Therefore, the user of the terminal 5 can arbitrarily select an optimum data communication service from available data communication services, and the convenience of the data communication terminal can be improved.

In the seventh embodiment, the terminal 5 requesting data communication acquires the position information via the position information creating unit 12, and the base station position information database 7 stores the terminal information based on the position information. Although the data communication service that can be provided to the terminal 5 is extracted, the acquisition of the position information of the terminal 5 is not limited to such a method. May be configured to estimate the position information.

Further, the user application that has made the data communication request selects the data communication service to be actually used based on the communication speed of each data communication service notified from the communication speed determining unit 11, The selection of the data communication service is not limited to such a method. For example, the usage rate per unit time of each data communication service is stored in the communication speed determination unit 11 in advance, and each of The user application may be notified of the communication speed of the data communication service and the usage fee per unit time, and the user application may select a data communication service to be actually used based on the information. In this case,
The user of the terminal 5 can select an optimal data communication service in consideration of the usage fee of each data communication service in addition to the communication speed.

[0175]

As described above, according to the present invention, a micro cell capable of high-speed data communication but having a small communicable cell area can be deployed in a macro cell deployed by a central base station. By arranging a microcell base station, and only when a request for a high-speed data communication service is generated at a terminal, by configuring the microcell base station to expand a microcell to provide a high-speed data communication service, Even if the communication service speeds up, it is possible to suppress an increase in transmission power of the entire wireless communication system.

A plurality of microcell base stations are arranged in the macrocell, and a base station position information database storing the positions of the microcell base stations is provided.
The base station position information database specifies a micro cell base station capable of providing a high-speed data communication service based on the current position information transmitted from the terminal, and the micro cell base station only in the vicinity of the terminal. Has an effect that the increase in the transmission power of the entire wireless communication system can be suppressed.

Further, even when a terminal performing high-speed data communication moves, the base station position information database is configured to specify a microcell base station based on the position information of the terminal. It is possible to provide a high-speed data communication service from a microcell base station in the vicinity of the terminal, and it is possible to increase the mobility of a terminal using the high-speed data communication service.

[0178] The mobile station further comprises terminal position estimating means for estimating the position of the terminal based on a radio signal transmitted from the terminal to the central base station, and when a request for a high-speed data communication service is generated, the terminal position estimating means is provided. Estimating the terminal position, the base station position information database identifies a microcell base station capable of providing a high-speed data communication service to the terminal based on the estimated position information, and the identified microcell By adopting a configuration in which the microcell is deployed only in the base station, it is possible to suppress an increase in transmission power of the entire wireless communication system. In addition, since it is not necessary to provide the terminal with a position detecting means such as GPS for detecting position information, there is an effect that the terminal can be reduced in size and power consumption can be reduced.

Further, when a data communication request is generated from the terminal, the communication speed determining means stores the communication speed of the data communication service available to the terminal in the base station position information database before starting the data communication. Inquiry, the base station location information database calculates the maximum communication speed of the data communication service that can be provided to the terminal and responds to the terminal,
Since the user is configured to arbitrarily select an optimal data communication service based on the maximum communication speed, there is an effect that the convenience of the data communication terminal can be further improved.

Further, there is provided a required quality determining means for determining a communication quality required when performing high-speed data communication with the terminal,
When a high-quality high-speed data communication service is requested by the terminal, the micro-cell base station specified by the base station location information database expands the micro-cell having an enlarged cell radius to provide a high-speed data communication service. Is provided, there is an effect that the mobility of the terminal can be improved while suppressing the deterioration of the communication quality of the high-speed data communication.

When a high-speed data communication service of high quality is requested from a terminal, the base station position information database specifies all microcell base stations in a predetermined area including the terminal, By having the configuration to transmit data to the terminal from all the specified micro cell base station, it is possible to increase the mobility of the terminal while suppressing the deterioration of communication quality of high-speed data communication,
This has the effect.

Further, the terminal has a moving speed detecting means,
The request quality determination means is configured to determine whether or not to make a high quality communication request based on the movement speed of the terminal detected by the movement speed detection means, so that when the movement speed of the terminal is low, Since a high-speed data communication service is automatically provided by a normal microcell, an increase in transmission power of the entire wireless communication system can be suppressed.

Further, the radio communication system includes micro cell base station control means for controlling a plurality of micro cell base stations, and the high speed data communication provided by one micro cell base station by the communication speed judgment means of the terminal. If it is determined that data communication at a higher speed than the service is required, the connection control means transmits a control signal for a high-speed and large-volume data communication request and receives the control signal. The cell base station control means is configured to perform multi-station multiplex transmission of large-capacity data through a plurality of micro cell base stations located in the vicinity of the terminal and specified by the base station position information database. A high-speed and large-capacity data communication service in response to a request from a terminal while minimizing an increase in transmission power of the entire wireless communication system. It is possible to provide an effect like.

Further, the connection control means transmits a control signal for a high-speed and large-capacity data communication request of the terminal including information on a requested communication speed, and the microcell base station control means transmits base station position information. Calculate the maximum communication speed that can be provided by the plurality of microcell base stations specified by the database, compare the maximum communication speed with the requested communication speed, and determine that the maximum communication speed is the requested communication speed. In the case where the speed is lower than that, the terminal is configured to inquire whether or not to perform high-speed data communication at the maximum communication speed. Another advantage is that a high-speed and large-capacity data communication service can be provided without hindrance.

Further, the central base station transmits data to the terminal at a predetermined transmission power determined based on the maximum transmission power of the central base station and the number of terminals assumed in advance, and transmits the data from the central base station to the central base station. A repeater for amplifying and retransmitting the transmitted data signal is arranged in the macro cell, and the terminal is configured to provide a high-speed data communication service via the repeater, thereby reducing transmission power of data transmitted from the central base station. It is possible to develop a micro cell capable of high-speed data communication only in the vicinity of a terminal while suppressing the increase, thereby suppressing an increase in transmission power of the entire wireless communication system.

In addition, since a user charging database for calculating a total communication time of a terminal is separately provided for each data communication service provided by the radio communication service, hardware resources and radio resources of the radio communication system are provided. It is possible to perform charging management according to the usage status of the terminal, and improve the convenience of charging management of the wireless communication system while improving the convenience of data communication of the terminal.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless communication system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a terminal according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing base station position information stored in a base station position information database according to Embodiment 1 of the present invention.

FIG. 4 is a configuration diagram of a receiving unit of a central base station according to Embodiment 2 of the present invention.

FIG. 5 is a configuration diagram of a wireless communication system according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a repeater according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram of a wireless communication system according to a fourth embodiment of the present invention.

FIG. 8 is a configuration diagram of a terminal according to Embodiment 4 of the present invention.

FIG. 9 is an explanatory diagram showing an example of recording in a user accounting database according to a fourth embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a state of providing a high-speed data communication service of a microcell base station in a wireless communication system according to a fifth embodiment of the present invention.

FIG. 11 is a configuration diagram of a wireless communication system according to a sixth embodiment of the present invention.

FIG. 12 is an explanatory diagram showing a state of providing a high-speed large-capacity data communication service of a microcell base station in a wireless communication system according to a sixth embodiment of the present invention.

FIG. 13 is a configuration diagram of a conventional wireless communication system.

[Explanation of symbols]

 1a, 1b, 1c, 1d, 1e Microcell base station 2a, 2b, 2c, 2d, 2e, 102 Microcell 3, 103 Central base station 4, 104 Macrocell 5, 105 Terminal 6 Communication network 7 Base station location information database 8 User charging database 11 Communication speed determination unit 12 Position information creation unit 13 Connection control unit 21 Array antenna 22 A / D 23 Direction detection unit 24 Reception strength measurement unit 25 Terminal position estimation unit 26 Propagation loss profile 27 Base station control units 30a, 30b Repeater 31 Receiving antenna 32 Auxiliary antenna 33 Antenna canceller 34 Phase / amplitude control unit 35 Combiner 36 Loop-back canceller 37 Delay time estimation unit 38 Memory 39 Correlation processing unit 40 Transmission path estimation unit 41 Replica generation unit 43 Subtractor 44 Low distortion transmission Amplifier 45 Retransmission antennas 50a, 50b, 50c Expanded microcell 51 Required quality determination unit 52 Moving speed detection unit 55 Region of predetermined distance R from terminal 5 60 Microcell base station controller 101 Base station

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K033 AA04 DA01 DA19 DB20 EA03 5K067 AA21 AA43 BB04 DD29 DD53 EE02 EE10 EE16 HH21 HH23 JJ39 JJ52 JJ56 JJ66

Claims (16)

[Claims] A central base station that deploys a macro cell having a wide communicable area; a micro cell base station that is arranged in the macro cell and that can perform data communication at a higher speed than the central base station; A wireless communication system having a terminal that performs data communication at a low communication speed by wirelessly connecting to the terminal, wherein the terminal has a communication speed with the central base station when a request for data communication occurs. Communication speed determining means for determining whether a high communication speed is required, and connection control means for transmitting a control signal for a high-speed data communication request when the communication speed determining means determines that a high communication speed is required The microcell base station, wherein when the terminal transmits a control signal including a high-speed data communication request, the microphone has a smaller communicable area than the macrocell. Wireless communication system to expand the cells, and wherein said terminal and that is configured to perform high-speed data communication than the central base station before performing a wireless connection. 2. A plurality of micro-cell base stations are arranged in a macro cell, and a base station position information database in which position information of each of the plurality of micro-cell base stations is recorded in advance, wherein the terminal A position information generating unit that detects position information, the connection control unit transmits the control signal of the high-speed data communication request including the position information, and the base station position information database includes: Based on the location information of the terminal included in the control signal of the high-speed data communication request,
A microcell base station capable of wireless connection with the terminal is specified, and the specified microcell base station is configured to perform high-speed data communication by performing wireless connection with the terminal. The wireless communication system according to claim 1. 3. A plurality of micro cell base stations are arranged in a macro cell, and a base station position information database in which position information of each of the plurality of micro cell base stations is recorded in advance is provided. Direction finding means for estimating the direction of arrival of a radio signal transmitted from a terminal requesting data communication,
A reception intensity measurement unit that measures reception intensity of a radio signal transmitted from the terminal; and a terminal position estimation unit that estimates a position of the terminal based on an arrival direction and a reception intensity of the radio signal. Station location information database, based on the location information of each of the plurality of micro-cell base station, based on the location information of the terminal estimated by the terminal location estimation means,
A microcell base station capable of wireless connection with the terminal is specified, and the specified microcell base station is configured to perform high-speed data communication by performing wireless connection with the terminal. The wireless communication system according to claim 1. 4. The base station position information database is configured to calculate a communication speed of data communication that can be used by the terminal based on position information of the terminal. Inquire the communication speed of available data communication to the base station location information database, based on information on the communication speed of available data communication notified from the base station location information database, for the user of the terminal, 4. The wireless communication system according to claim 2, wherein a communication speed of data communication used for data communication is selected. 5. A request quality judging means for judging whether or not high-speed data communication with good communication quality is required when the communication speed judging means judges that high-speed data communication is necessary. Provided, when it is determined by the required quality determination means that high-speed data communication with good communication quality is required, the connection control means transmits a control signal of the high-speed data communication request including the high-quality communication request, The microcell base station specified by the base station position information database expands the microcell in accordance with the high quality communication request, and is configured to perform high-speed data communication with the terminal. Items 1 to 4
The wireless communication system according to any one of the above. 6. A terminal includes a required quality determining unit that determines whether high-speed data communication with good communication quality is required when it is determined that high-speed data communication is required. If it is determined that high-speed data communication with good quality is required, the connection control means
The control signal of the high-speed data communication request is transmitted including the high-quality communication request, and the base station position information database specifies all microcell base stations in a predetermined area including the terminal according to the high-quality communication request. 5. The radio communication system according to claim 1, wherein each of the specified microcell base stations transmits data to the terminal. 7. The terminal has moving speed detecting means for detecting the moving speed of the terminal, and the required quality determining means has good communication quality when the detected moving speed is higher than a predetermined threshold. 7. The wireless communication system according to claim 5, wherein it is determined that a high-speed data communication is required. 8. The wireless communication system according to claim 1, further comprising: a microphone cell base station control unit for controlling a plurality of micro cell base stations; When occurs, it is determined whether a communication speed higher than the communication speed between the central base station and the microcell base station is required,
As a result, when it is determined that a high communication speed is necessary, the connection control unit transmits a control signal of a high-speed large-capacity data communication request to the microcell base station control unit, and receives the control signal. A wireless communication system, wherein the microcell base station control means performs multi-station multiplex transmission of transmission data for the terminal via a plurality of microcell base stations specified by a base station position information database. . 9. The connection control means transmits a control signal of a high-speed and large-capacity data communication request including information on a requested communication speed, and the micro-cell base station control means having received the control signal transmits the control signal to the base station. Calculate the maximum communication speed that can be provided by multi-station multiplex transmission through a plurality of microcell base stations specified by the information database, and when the maximum communication speed is lower than the requested communication speed, For the terminal, characterized in that it is configured to inquire whether to perform high-speed data communication at the maximum communication speed,
A wireless communication system according to claim 8. 10. The wireless communication system according to claim 1, wherein the central base station wirelessly transmits data to the terminal with a predetermined transmission power in the macro cell, and replaces the micro cell base station with: In the macro cell, a repeater that receives a radio signal transmitted from the central base station, amplifies the radio signal and retransmits the radio signal to a terminal is arranged, and the terminal transmits a radio signal retransmitted from the repeater. A wireless communication system configured to receive and perform high-speed data communication with the central base station. 11. A plurality of microcell base stations capable of performing high-speed data communication in a small area are arranged in a macro cell in which a central base station capable of performing low-speed data communication in a wide area is provided. In a communication control method of a wireless communication system for performing data communication with a base station or the microcell base station, a communication speed of data communication with the central base station when a data communication request is generated from the terminal. A communication speed determination step for determining whether a higher communication speed is required, and a connection for transmitting a control signal for a high-speed data communication request when the communication speed determination step determines that a higher communication speed is required. A control step, and deploying a microcell to the microcell base station only when a control signal of a high-speed data communication request is transmitted in the connection control step. A high-speed data communication service providing step of performing high-speed data communication between the terminal and the microcell base station. 12. The communication control method according to claim 11, further comprising: detecting a position information of the terminal when the communication speed determination step determines that a high communication speed is required; Terminal position detecting step to be output to, based on the position information transmitted and included in the control signal of the high-speed data communication request in the connection control step, based on the position information of each of the plurality of microcell base stations stored in advance. ,
A microcell base station specifying step of specifying a microcell base station capable of high-speed data communication with the terminal, wherein the high-speed data communication service providing step includes a control including a high-speed data communication request in the connection control step. Only when a signal is transmitted, the microcell is expanded only to the microcell base station specified in the microcell base station specifying step, and high-speed data is transmitted between the terminal and the specified microcell base station. A communication control method for a wireless communication system, characterized by performing communication. 13. The communication control method according to claim 11, further comprising: a terminal position estimating step of estimating position information of the terminal when a control signal including a high-speed data communication request is transmitted in the connection control step. A microcell base station specifying step of specifying a microcell base station capable of high-speed data communication with the terminal based on the position information and the position information of each of the plurality of microcell base stations stored in advance. Provided, the high-speed data communication service providing step is performed only when the control signal including the high-speed data communication request is transmitted in the connection control step, and only when the micro-cell base station specified in the micro-cell base station specifying step is a micro-cell base station. And performing high-speed data communication between the terminal and the specified microcell base station. Communication control method of a communication system. 14. The communication control method according to claim 12, further comprising the step of: when it is determined in the communication speed determining step that a high communication speed is required, high-speed data having good communication quality. A request quality determination step for determining whether communication is required; and when the request quality determination step determines that high-speed data with good communication quality is required, the connection control means controls the high-speed data communication request. The high-speed data communication service providing step includes a step of providing a high-speed data communication request including the high-quality communication request in the connection control step. Expanding the microcell in which the communicable area is extended to the microcell base station specified in the specifying step, and the terminal and the specified microcell base Communication control method for a wireless communication system, characterized in that to perform high-speed data communication with. 15. The communication control method according to claim 14, wherein
The microcell specifying step, when a high-quality communication request is included in the control signal of the high-speed data communication request, the position information transmitted by being included in the control signal of the high-speed data communication request in the connection control step, Based on the position information of each of the plurality of microcell base stations stored in advance, all microcell base stations in a predetermined area including a terminal that has transmitted a control signal for a high-speed data communication request are specified, and high-speed data communication is performed. The service providing step is a communication control method for a wireless communication system, wherein each of the specified microcell base stations transmits data to the terminal to perform high-speed data communication. 16. The communication control method according to claim 14, wherein a total communication time of low-speed data communication performed by the terminal with the central base station and a communication time between the terminal and the microcell base station. The total communication time of the high-speed data communication without the high quality request and the total communication time of the high-speed data communication with the high quality request are separately counted, and each data is added to the total communication time of the data communication. A management method for a wireless communication system, comprising a user billing management step of calculating a communication fee for each data communication by multiplying a usage fee per unit time separately set for each communication.