JP2874656B2 - High-speed wireless data transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to high-speed wireless data which can be used mainly for outdoor use and can transmit data at a high speed of several Mbps or more, using quasi-millimeter wave band or millimeter wave band high-frequency signals (referred to as millimeter wave). Related to transmission systems.

[0002]

2. Description of the Related Art At present, personal handy phones (PH)
Mobile phones capable of transmitting digital signals such as S) have become widespread. These mobile phones use a relatively low frequency band of 2 GHz or less. Also, since the transmission rate of digital mobile phones is mainly voice transmission,
At most 32 kbps, the transmission speed is at most 64 kbps. Therefore, it is not suitable for high-speed data communication such as image transmission having a transmission speed of at least 1 Mbps. For this reason, recently, a system using millimeter waves or the like as high-speed data communication has been studied. FIG. 4 is a diagram showing a conventional configuration of a high-speed wireless data transmission system using a millimeter wave or the like.

In FIG. 1, reference numeral 1 denotes a high-speed wireless data communication base station provided with a high-speed wireless data communication base station antenna 111.

[0004] A plurality of portable wireless terminal devices 2 are connected to a high-speed wireless data communication base station 1 using a high-speed wireless line 3 such as a millimeter wave.

[0005] Here, the portable radio terminal device 2 is provided with an audio input / output unit 24 for interfacing an audio signal of a telephone line or the like.
And an audio processing unit 23 which converts an analog audio signal of the audio input / output unit 24 into a digital signal and converts it into a predetermined data signal.
And a display / input / output unit 25 having a keyboard input / output function, a voice processing unit 23 and a display / input / output unit 25 for displaying image data from a personal computer or the like, and modulating / demodulating high-speed data. A data processing unit 22 for performing processing, a radio unit 21 for high-speed wireless data communication that interfaces with the data processing unit 22 and performs transmission / reception processing using high-frequency signals such as millimeter waves, and an antenna 26 for high-speed data such as millimeter waves Have been.

When a system using millimeter waves or the like suitable for high-speed data communication such as image transmission is configured, a wide frequency bandwidth can be obtained, but attenuation of radio wave propagation is increased due to a high frequency. Since the amount of data increases and the delay time needs to be shortened for high-speed transmission, the area where a plurality of portable wireless terminal devices 2 can provide a communication service from the high-speed wireless data communication base station 1 is limited to a range of several hundred meters. Subject to restrictions that do not earn.

Accordingly, the high-speed wireless data transmission system shown in FIG. 3 accurately detects the position of the portable wireless terminal device 2 because the zone that the high-speed wireless data communication base station 1 can cover is narrow, and is closest to the position. The high-speed wireless data communication base station 1 must be selected for communication.

[0008] As such a base station selecting means, for example,
This is described in Japanese Patent Application Laid-Open No. 7-321734. Japanese Patent Application Laid-Open No. 7-321734 discloses that a conventional mobile phone uses a GPS (Global Pos) to obtain current position information and the like.
There has been proposed a communication system equipped with an ionizing system receiver and selecting an optimal base station based on current position information. In a system using a relatively low frequency, such as the communication system described above, since communication is performed using a conventional mobile phone with a small dead zone of radio waves, communication with a base station can be established over a wide service area.

However, in a high-speed wireless data transmission system using a high frequency such as a millimeter wave, it is difficult to establish communication in a blind zone where radio waves between base stations do not reach.

[0010]

As described above,
The present invention solves the problem that in a high-speed wireless data transmission system that transmits high-speed data using a high-frequency band such as a millimeter wave, a dead zone where radio waves do not reach is created, so that a user does not know which base station to communicate with. Had.

The present invention solves such a problem, and enables a user to know whether or not the use of a high-speed data service is available, and to know a service area for further use. It is intended to provide.

[0012]

A high-speed wireless data transmission system according to the present invention provides a high-speed wireless data transmission system for performing high-speed data communication between a first base station and a plurality of terminal devices using a first wireless line. The terminal device performs low-speed data communication using a second base station and a second wireless channel at the start of communication, and notifies the location of the terminal device to a management central center connected to the second base station; Receiving whether the high-speed data communication is possible from the management central center,
When the high-speed data communication is not possible, a means for receiving an optimum receiving position is provided.

The first wireless line is a wireless line using a high-frequency signal of a millimeter wave or a quasi-millimeter wave, and high-speed data has a transmission speed of at least 1 Mbps. On the other hand, the second wireless line is a microwave band wireless line for digital cellular phones, and the transmission data has a transmission speed of at most 64 kbps. The means for establishing the high-speed data communication notifies a location of the terminal device to a management central center connected to the second base station, receives from the management central center whether or not the high-speed data communication is possible, When high-speed data communication is not possible, an optimal receiving position is received.

[0014] Further, it is characterized in that whether or not the high-speed data communication is possible is determined based on whether or not the position of the terminal device is present in an area where the first base station can communicate.

Further, the position of the terminal device is GPS
(Global positioning system).

A portable high-speed wireless communication device using a millimeter wave or a quasi-millimeter wave is connected to a relatively low-speed wireless data communication device such as a personal handyphone using a microwave band which is currently in operation and a plurality of satellites. It has a current position detecting device (GPS) for estimating the current position using radio waves, and obtains data from a management station that manages information on the base station at the current position by the low-speed wireless data communication device at the start of communication, and performs communication. It has the function of notifying the user whether it is possible, the available location near the current location and the optimal receiving location, and automatically connecting to the base station if communication is possible.

According to the present invention, in a high-speed wireless communication apparatus having a relatively narrow service area, a user can know an available area in a dead zone where radio waves for high-speed communication do not reach, and even if there is less information. For example, communication can be performed using a low-speed wireless data communication device.

[0018]

FIG. 1 is a block diagram of a high-speed wireless data transmission system according to an embodiment of the present invention.

In FIG. 1, reference numerals 41 and 42 denote service areas in which two high-speed wireless data communication base stations 1 (referred to as base stations 1) cover high-speed communication.

That is, the service areas 41 and 42 are:
Since a millimeter wave or the like is used, the radius around the base station 1 is as small as several hundred meters. Therefore, a plurality of base stations 1
Even if the system is installed, there will be areas where services cannot be provided.

On the other hand, reference numeral 51 denotes a service area covered by the low-speed data communication base station 5 using a relatively low frequency (2 GHz band) such as a microwave band such as PHS. The service area 51 includes both the service areas 41 and 42 because the service can be performed over a wide area.

Reference numeral 2 denotes a portable wireless terminal device 2 (referred to as a terminal 2).

Here, a block diagram of the terminal 2 is shown in FIG.

In FIG. 1, a terminal 2 includes a high-speed data antenna 26 for transmitting and receiving signals such as millimeter waves and a low-speed data antenna 28 for transmitting and receiving low-speed data such as PHS.
And three GPS receiving antennas 33 for performing GPS reception.

A low-speed data communication radio unit 27 is connected to the low-speed data antenna 28, and has a function of converting low-speed data into a microwave band signal and transmitting and receiving.

The low-speed wireless data communication radio section includes:
The audio processing unit 23 is connected, and performs modulation / demodulation processing of an audio signal. Further, a wireless data communication control unit 29 is connected to the low-speed wireless data communication wireless unit 27.

On the other hand, as described with reference to FIG. 4, for high-speed wireless data, the high-speed data antenna 26, the high-speed wireless data communication wireless unit 21, the wireless data communication control unit 29,
It comprises a display / input / output unit 25.

The terminal 2 is provided with a current position information detecting unit 30.
Is provided. This current position information detecting unit 30
The GPS reception signal received by the S reception antenna 33 is received by the current position information detection wireless unit 32, and the received position information data is subjected to data processing by the position information detection data processing unit 31, and the display / input / output unit 25.

A base station information management central center (referred to as a center) 6 is connected to the low-speed data communication base station 5 by a telephone line or the like.
It has a control function for notifying the available service area based on information such as the position of the terminal 2.

The operation of the high-speed wireless data transmission system described above will be described below. FIG. 3 is a flowchart showing the communication connecting means of the high-speed wireless data transmission system, and the operation will be described with reference to FIGS.

When high-speed data transmission of images or the like is required in the terminal 2, the wireless data communication control unit 29 of the terminal first sends the center 6 to the low-speed data communication radio unit 27.
Automatically sends the calling data for This call data is a telephone number when the center 6 and the low-speed data communication base station 5 use a public telephone network.

The calling data is transmitted from the low-speed data antenna 28, and is transmitted to the microwave band radio line 53.
Is received by the low-speed data communication base station 5 via the. Then, the center 6 is called via the telephone line 8. next,
After transmitting the calling signal, the terminal 2 transmits the absolute position information data of the terminal 2 obtained based on the GPS reception signal received from the GPS satellite 7 via the GPS radio line 4 to the center by the radio data communication control unit 29. 6 is sent.

The center 6 that has received the information confirms whether high-speed data communication is possible according to the position of the terminal 2 and performs the following control.

The center 6 determines whether high-speed data communication is possible based on the position information and the service area range of all the high-speed wireless data communication base stations 1 in which the current position information transmitted from the terminal 2 is stored in advance. I do. In other words, when the position of the terminal 2 is outside the dead zone of the radio wave of the high-speed data communication or out of the service area, the information on the communication disabled is transmitted to the terminal 2 using the low-speed data communication line.

Such data is displayed on the display of the display / input / output unit 25 of the terminal 2 to indicate that it is out of the service area. In this case, not only the character display but also the map information stored in advance is displayed on the display, so that the user can easily distinguish the display.

The terminal 2 then transmits to the center 6 the high-speed wireless data communication base station 1 closest to the current position of the terminal 2.
The inquiry data of the information is transmitted. Upon receiving such inquiry data, the center 6 determines from the position data of the high-speed wireless data communication base station 1 stored in advance,
The data on the nearest base station and its area will be sent to the terminal 2.

By displaying this data, the display / input / output unit 25 of the terminal 2 can instantaneously determine where to move the terminal 2.

The case where the terminal 2 is located outside the service area has been described above. However, when the terminal 2 is located inside the service area, the low-speed data line connection with the center 6 is cut off, and the original high-speed data transmission is performed. It starts between the high-speed wireless data communication base stations 1.

The frequency used in the low-speed data communication used in the present invention is currently about 1 to 2 GHz, and can be transmitted over a wide range in terms of radio wave propagation. Since it can be used, the cost of the connection can be reduced. If the required data at a transmission rate of several kbps is sufficient, only low-speed data communication can be used. High-speed data communication or low-speed data communication can be selected by software on the computer as appropriate. is there.

In the configuration described above, the information on the current position is described using the GPS receiver. However, the user can directly input the current position information to the display / input / output unit 25 using the current position magnet or map. It is also possible to make it unnecessary.

[0041]

According to the present invention, in a high-speed wireless communication apparatus having a relatively narrow service area, a user can know the service area even in a dead zone where radio waves for high-speed communication do not reach, and further reduce information. Then, there is an effect that communication can be performed using a low-speed wireless data communication device.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of the portable wireless terminal device 2 of FIG.

FIG. 3 is a flowchart showing the operation of the line connection of FIG. 1;

FIG. 4 is a system block diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-speed wireless data communication base station 2 Portable wireless terminal device 3 High-speed wireless line 4 GPS wireless line 5 Low-speed data communication base station 6 Base station information management central center 7 Satellite 8 Telephone line 11,26 High-speed data antenna 28,52 Low speed Data antenna 33 GPS receiving antenna 41, 42 High-speed data service area 51 Low-speed data service area 53 Low-speed wireless line

Claims (7)

(57) [Claims] 1. A first base station and a plurality of terminal devices are connected by a first
In a high-speed wireless data transmission system for performing high-speed data communication using a wireless line, the terminal device performs low-speed data communication using a second base station and a second wireless line at the start of communication, and performs the position of the terminal device. To the second base station
Notify the management central center to
Receiving whether the high-speed data communication is possible,
A high- speed wireless data transmission system comprising means for receiving an optimum reception position when high-speed data communication is not possible . 2. The high-speed wireless data transmission system according to claim 1, wherein said first wireless line is a communication line using a millimeter wave or quasi-millimeter wave high frequency signal. 3. The high-speed data is at least 1 Mbp.
2. The high-speed wireless data transmission system according to claim 1, wherein the high-speed wireless data transmission system has a transmission speed of at least s. 4. The high-speed wireless data transmission system according to claim 1, wherein the second wireless line is a microwave band wireless line for a digital cellular phone. 5. The low-speed data has a maximum size of 64 kbp.
2. The high-speed wireless data transmission system according to claim 1, wherein the transmission speed is s. 6. The method of claim 1, wherein the determining by whether the position of the terminal device to the high-speed data communication is possible if the first base station communicable area of whether there High-speed wireless data transmission system. Wherein said position of the terminal device, high-speed wireless data transmission system according to claim 1, wherein the detecting using a GPS (Global Positioning System).