JP2002094425A - Internet connection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge relay distance and reduce greatly lowering of communication capacity caused by interference. SOLUTION: An internet connection system includes a termination station terminal 3, having data communication means 4 and 5 for data communication with at least one computer terminal 6 in a described region, a gate station terminal 2 capable of data communication and connected with the Internet, and at least a relay station system 1 capable of two-way radio data transmission between the gate station terminal 2 and the termination station terminal 3. The computer terminal 6 is capable of making a connection with the Internet. The termination station terminal 3, the gate station terminal 2, and the relay station terminal 1 have high directivity antennas 11a to 11d for generating radio waves in a described locally limited direction. The high directivity antennas are located so as to have their directivities mutually counterposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Internet connection system capable of connecting an information terminal such as a computer to an Internet network at low cost and with ease.

[0002]

2. Description of the Related Art In recent years, with the spread of personal computers, the number of users who use the Internet, which is a computer network, at home is increasing rapidly. When using the Internet, it is possible to connect to a provider (ISP), which is a connection company that normally connects to the Internet network, via a communication line such as a general telephone line or a dedicated line. It has been done.

[0003] However, with the recent advance of multimedia, voices and images having relatively large data capacity have been transmitted through these communication lines. However, even if a modem or the like is used, the maximum communication speed of 57.6 Kbit / sec (bps) is limited, and the transmission of the voice, image, and the like is not sufficient. .

[0004] Therefore, in order to use the Internet more comfortably, it is only necessary to newly install a line having a high transmission speed such as a digital line such as ISDN and improve the communication speed. However, if a new cable for such a digital line is to be newly laid in a building such as a building or a condominium, the labor and cost are extremely large.

Therefore, in recent years, as a method of solving the problem of labor and cost in laying these cables and the like, a computer in the building is connected to the Internet by radio instead of the cables. Many connection systems for connection have been studied.

In a connection system for connecting a computer existing in a cell such as a building to the Internet by radio, the labor and cost for laying cables and the like can be greatly reduced as described above. Although it is possible to provide an Internet connection at a relatively low cost as an initial facility cost, communication such as a general telephone line or a dedicated line for connecting the predetermined area including the building such as the building or the condominium to the Internet. If a line is used, call charges on these communication lines will be high, and many users will always have a constant connection to the Internet because they have no complications when connecting. As a method to solve these problems, the specified area including buildings such as the aforementioned buildings and condominiums Without using the communication line has been implemented many attempts to connect to the Internet by the data (digital) communication by radio.

[0007]

However, when connecting to the Internet network by wireless data (digital) communication, there is a point at which a connection base with a backbone, which is a connection line with the Internet network, is located, and a point at which the building is connected. In some cases, the distance between a point where a predetermined area including a building such as a building and a condominium exists is relatively long, and in such a case, one or more steps are provided between the point where the connection base is located and the point where the predetermined area is present. However, if conventional wireless communication methods are used for these wireless relays, the interval between these relays must be longer in order to construct a system at lower cost. However, when using radio waves in a frequency band in which these relatively high-speed digital communications are possible, Due to the prescribed restrictions on the radio wave output, these communicable distances cannot be increased beyond a prescribed range, and the width of the usable frequency band is limited. In such a case, there is a problem that mutual interference occurs in each wireless communication above and below the relay, and a desired communication capacity cannot be secured.

Accordingly, the present invention has been made in view of the above-mentioned problems. Even when connecting to the Internet by data (digital) communication through wireless relay, the relay distance can be increased and the communication capacity due to interference can be increased. It is an object of the present invention to provide an Internet connection system capable of greatly reducing the deterioration of the Internet.

[0009]

In order to solve the above-mentioned problems, an Internet connection system according to the present invention comprises a data communication means for performing data communication with at least one computer terminal located in a predetermined area. Terminal station terminal, a gate station terminal connected to the Internet network so as to enable data communication, and at least one relay connecting the gate station terminal and the terminal station terminal so as to enable wireless two-way data communication. A terminal device, wherein the computer terminal is connectable to the Internet network, wherein the terminal station terminal, the gate station terminal, and the relay station device are provided in a very limited predetermined direction. It has high directivity antennas that can output radio waves only to the antennas, and high directivity antennas that perform wireless communication are provided so that their directivities face each other. It is set to. According to this feature,
By using the high directivity antenna, it is possible to concentrate the limited radio wave output only in a predetermined directivity direction, so that not only can the relay distance in wireless communication be longer. In addition, since it is possible to significantly suppress the spread of radio waves used between the highly directional antennas, it is possible to significantly suppress interference between relay communication and mutual interference, and it is possible to significantly reduce communication due to these interferences. The reduction in capacity can be significantly reduced.

[0010] The Internet connection system of the present invention comprises:
Preferably, the highly directional antenna is a parabona antenna. By doing so, the parabona antenna can obtain extremely high directivity at a low cost, so that the system can be constructed at a low cost.

[0011] The Internet connection system of the present invention comprises:
It is preferable to provide two highly directional antennas of the relay station device such that their directivity directions are not on the same straight line. By doing so, it becomes possible to use the same frequency in both wireless communications of the relay, and it is possible to save frequency resources.

[0012] The Internet connection system of the present invention comprises:
The relay station device includes a modulation / demodulation unit that demodulates radio waves received by one high directivity antenna to digital data, modulates the digital data again, and transmits the digital data from the other high directivity antenna. Is preferred. In this way, an increase in data errors due to relay can be significantly reduced.

The Internet connection system of the present invention comprises:
It is preferable that the relay station device be capable of transmitting and receiving radio waves in different frequency bands for each highly directional antenna. In this way, by using radio waves of different frequency bands for each highly directional antenna, it is possible to avoid a reduction in communication capacity due to interference even if reflection or the like occurs.

The Internet connection system of the present invention comprises:
It is preferable that the relay station device includes frequency setting means for setting a difference in frequency between the high directivity antennas to be as large as possible. This makes it possible to set the optimum frequency reliably and easily.

The Internet connection system of the present invention comprises:
It is preferable that the wireless two-way data communication is spread spectrum communication in which a narrow band base band signal on which transmission data is superimposed is spread over a wide band by a predetermined modulation method and transmitted. With this configuration, it is possible to perform stable communication that is less susceptible to the influence of multipath due to reflection of a building or the like as compared with normal narrow-band modulation communication, and it is also possible to perform communication at higher speed than with normal narrow-band modulation communication. Communication can be performed.

The Internet connection system of the present invention comprises:
Data communication means for performing data communication with the computer terminal in the terminal station terminal is a wireless communication between the slave terminal connected to the computer terminal and the bidirectional data communication with the slave terminal. It is preferable that the communication terminal is formed by a master terminal connected to the terminal station terminal and capable of being implemented in parallel. With this configuration, there is no need to install a communication cable or the like for connection with the computer terminal,
Communication with these computer terminals can be simply and inexpensively formed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment) FIG. 1 is a block diagram showing the configuration of an Internet connection system according to the present embodiment. FIG. 2 is a block diagram showing the connection of each cell to the Internet network by wireless communication in the Internet connection system according to the present embodiment. FIG. 3 is a diagram showing the configuration of a gate station terminal, a relay station terminal, and a terminal station terminal for performing the operation. FIG. 3 is a block diagram showing the configuration of the gate station terminal and the terminal station terminal used in the present embodiment. Is a block diagram showing a configuration of a relay station device used in the present embodiment,
FIG. 5 is a diagram showing a configuration of a cell in the Internet connection system of the present embodiment. FIG. 6 is a diagram showing an arrangement state of each antenna in a cell of the Internet connection system of the present embodiment. FIG. 7 is a diagram showing a connection status between the master unit and each antenna used for cell construction of the Internet connection system of the present embodiment, and FIG.
FIG. 9A is a diagram illustrating an arrangement state of each antenna of the relay station terminal and the terminal station terminal, and FIG. 9A is a diagram illustrating setting contents in the relay station terminal used in the present embodiment.
FIG. 3 is a block diagram showing a configuration of a base unit 4 used in the present embodiment.

First, in the Internet connection system according to the present embodiment, as shown in FIG. 1, each cell within a range connectable to the Internet network via the base unit 4 by wireless communication includes:
The base station 4 is formed as a range in which wireless communication with the base station 4 is possible, and the base station 4 communicates with a slave unit 5 connected to each computer 6 existing in the cell by a spread spectrum communication method described later. Relatively high-speed two-way wireless communication can be performed, and communication with a plurality of slave units 5 existing in these cells can be performed simultaneously in parallel by a time-division multiplexing method described later. I have.

As shown in FIG. 5, these master units 4 are relatively high-rise buildings in an area where cells are desired to be formed.
It is installed in apartments where many users are occupying,
By arranging a plurality of directional antennas 40 connected to the master unit 4 on the roof, the interior of the apartment, which is the building in which the master unit 4 is installed, is provided at a predetermined radio wave output. A predetermined area around the condominium where radio communication with the mobile phone is possible is defined as a cell. In this embodiment, the radio communication with the slave unit 5 requires an antenna power of 10 mW which does not require a radio license.
Since the wireless communication system of the specific low power standard described below is used, the diameter of these cells is about 1 km (with a radius of 50 km).
0m).

As described above, the wireless connection of each computer 6 using the slave unit 5 and the master unit 4 can eliminate the troublesome work such as laying a communication cable or the like to each computer 6. However, the present invention is not limited to this, and these computers 6 may be connected to the terminal station terminal 3 described later by communication using a communication cable or the like.

As shown in FIGS. 1 and 2, the base unit 4 forming each of these cells is provided at a connection center where a gateway server 7 connected to the Internet via an optical cable modem 35 is installed. A gate station terminal 2 connected to the gateway server 7 and having a parabolic antenna 11a which is a highly directional antenna.
And each slave unit 5 connected to the terminal station 3 wirelessly connected through the relay station device 1 and existing in the cell.
The computer 6 is connected to the Internet via the slave unit 5 → master unit 4 → terminal station terminal 3 → relay station device → gate station terminal 2 → gateway server 7. I have.

In this embodiment, a management center for centrally managing these Internet connection systems is provided, and the management center is provided with a management computer 100 connected to the Internet network. The communication status between the terminal station terminal 3 and the relay station device 1 or between the relay station device 1 and the gate station terminal 2 from the management computer 100, the change of each setting content of the master unit 4, the slave unit 5 can be remotely controlled via the Internet network.

The configurations of the gate station terminal 2 and the terminal station terminal 3 used in the present embodiment are shown in FIGS.
The gate station terminal 2 and the terminal station terminal 3 have substantially the same configuration, and are based on IEEE802.3 / 100baseT or IEEE 80, which is a high-speed data communication standard with the gateway server 7 or the base unit 4.
A communication unit 8 for performing data communication in EE802.3 / 10 baseT, and a narrow band base band in which transmission data output from the communication unit 8 and transmitted to the relay station device 1 are superimposed by a predetermined modulation method. The signal is spread and transmitted in a wide band, and similarly, the radio signal transmitted in a wide band in the relay station device 1 is despread to reproduce a narrow band base band signal, and a predetermined modulation is performed. A spread spectrum radio modem 10 for demodulating data superimposed on the narrow band base band signal by a method, a dip switch for setting a channel which is an output band of the radio wave spread in a wide band, and the like. It mainly comprises a setting input section 32 and a control microcomputer (MPU) 9 for controlling the operation of the gate station terminal 2 and the terminal station terminal 3.

The configuration of the spread spectrum radio modem 10 used in the present embodiment is as shown in FIG. 3, in which the narrow band base band signal modulated by the modulator 18 is converted into a predetermined spread code sequence. The spread spectrum is spread over a wide band by a spread spectrum spreader 19, and the spread wide band radio wave is amplified by an intermediate amplifier 21 and a power amplifier 22, and the antenna switch 31 and the band pass filter 2 are spread.
3 and a reception radio wave input from the antenna via the band pass filter 23 and the antenna switch 31 is amplified by the reception amplifier 25, and the amplified radio wave is inverted based on a predetermined spreading code sequence. A receiving system for converting the data into a narrow-band base band signal by a spread spectrum despreader 25, passing through a band-pass filter 26, amplifying by an intermediate amplifier 27, and restoring transmission data by a demodulator 28; By connecting the spread-spectrum wireless modem 10 to the parabona antennas 11a and 11d having high directivity facing each other with the parabona antennas 11b and 11c of the relay station device 1, High-speed duplex communication between the gate station terminal 2 and the terminal station terminal 3 through the relay station device 1 by spread spectrum communication. And to be able to implement the counter data communications.

Also, as shown in FIG. 4, the configuration of the relay station apparatus 1 used in this embodiment is substantially the same as that of the gate station terminal 2 and the terminal station terminal 3 shown in FIG. As a feature, two spread-spectrum wireless modems, a spread-spectrum wireless modem 10 for communicating with the gate station terminal 2 and another spread-spectrum wireless modem 10 for communicating with the terminal station terminal 3, are built-in. And the two spread spectrum wireless modems 10
Digital data is connected to each other via U34 so that transmission and reception can be performed mutually. Transmission data from the gate station terminal 2 is converted into digital data by the spread spectrum wireless modem 10 on the gate station terminal side, and is converted via the MPU34. The transmission data from the terminal station terminal 3 is also converted to digital data by the terminal station terminal side spread spectrum wireless modem 10 while being sent to the terminal station terminal side spread spectrum wireless modem 10, and transmitted to the gate station terminal via the MPU 34. Is transmitted to the spread-spectrum wireless modem 10 on the side. As described above, demodulating the received radio wave once, converting it into digital data, and modulating and transmitting the digital data again, for example, can reduce the deterioration of the data to be transmitted even if a multi-stage relay is performed. The present invention is not limited to this, but radio waves received at these relays are once despread and the despread radio waves are amplified and then spread again for transmission. You may do it.

In this embodiment, these gate station terminals 2
In the wireless communication between the relay station apparatus 1 and the terminal station terminal 3 and the relay station apparatus 1 as well as the wireless communication between the master unit 4 and the slave unit 5, the antenna power that does not require a wireless license is 10 mW or less. The wireless communication system of the specified low power standard whose band is the ISM band of the 2.4 GHz band is used, and the communicable distance in the radio wave output is usually the above-described master unit 4 and slave unit 5. Is about 500 m, but the maximum communicable distance between the gate station terminal 2 and the relay station device 1 and between the terminal station terminal 3 and the relay station device 1 can be maximized by using the high directivity parabolic antennas 11a to 11d. When the relay station device 1 is provided in one stage, the gate station terminal 2 and the terminal station terminal 3 can be connected at a distance of up to 10 km. When the distance is larger than 10 km, Repeater station 1 By increasing the number to three or more, it is possible to cope with a longer distance.

As described above, the relay station apparatus 1 of the present embodiment has separate spread-spectrum wireless modems for the gate station terminal side, which is the upstream side of the relay, and the terminal station terminal side, which is the downstream side of the relay. By having 10 individually, it is configured so that the frequency band used for spectrum communication can be different between the upstream side and the downstream side of the relay, and is used on the upstream side and the downstream side of these relays. A setting input unit 33 including a dip switch and the like for setting a channel corresponding to a frequency band is provided.

The setting contents in the setting input section 33 are as follows.
As shown in FIG. 9A, in this embodiment, the 2.4 GHz band available in the specific low power standard is divided into four different frequency band channels as shown in FIG. 9B. There are provided two modes, a mode A that divides the signal into three channels and a mode B that divides the signal into three different frequency bands. When the mode B is set in the setting input unit 33, the frequency used on the upstream and downstream sides of the relay is set. The MPU is set so that the channel on the gate station terminal side, which is upstream of the relay, is 1ch, and the channel on the terminal station terminal side, which is downstream of the relay, is 3ch.
Reference numeral 34 sets the two spread spectrum wireless modems 10.

When the mode A is set in the setting input section 33, the input of the setting number becomes valid. When 1 is set as the setting number, the difference between the frequencies used on the upstream and downstream sides of the relay is maximized. The combination of 1ch and 4ch is set, and for some reason, 1ch or 4ch
When the MPU cannot be used, 2 or 3 is appropriately set as the setting number, so that the combination of 1ch and 3ch or the combination of 2ch and 4ch, which is the combination having the largest frequency difference in that situation, is the MPU.
34.

In this embodiment, only the mode and the setting number are set as described above, and the combination that maximizes the difference between the frequencies used on the upstream and downstream sides of the relay is automatically set. The present invention is not limited to this, and each channel used on the upstream and downstream sides of the relay may be individually set arbitrarily.

The use of spread spectrum communication for the wireless communication between the gate station terminal 2 and the terminal station terminal 3 as in the present embodiment means that the spread spectrum communication is a multipath generated by reflected waves from buildings in an urban area or the like. It is preferable because it is less susceptible to the influence of and can perform high-speed data communication as compared with the conventional narrowband modulation communication,
The present embodiment is not limited to this.

In the present embodiment, it is preferable to use a parabolic antenna as the highly directional antenna as described above, since the parabolic antenna can obtain a sufficiently high directivity with a relatively simple structure. The present invention is not limited to this, and a high directivity antenna other than a parabona antenna may be used as these high directivity antennas.

In this embodiment, the gate station terminal 2
The communication speed of wireless communication between the base station 4 and the relay station device 1 and the terminal station 3 and the relay station device 1 is sufficiently higher than the communication speed between the master unit 4 and the slave unit 5 (2 Mbps in this embodiment). Thus, a data packet of 11 Mbps is used, and a synchronization header for performing frame synchronization is added to the head of the data packet to form a transmission packet. At this time, the data rate of the synchronization header is determined by the modulation method of the data packet being QMBOK (Q
uadrature M-ary Bi-Orthog
online Keying), but DQPSK
(Differential Quadrature
By using the modulation scheme of PSK), the data rate of the data packet is 2 Mbps, which is lower than the data rate of 11 Mbps.
It has a data rate of ps.

As described above, lowering the data rate of the synchronous header can reduce the rate of error in transmission in the synchronous header as compared with the data packet. This is preferable because it is possible to prevent the frame synchronization from becoming unstable without detecting the header, but the present invention is not limited to this.

The gate station terminal 2 and the relay station device 1
Is installed in an apartment building, which is the same building as the base unit 4, and the parabona antenna 11d is mounted on the roof of the apartment building in a direction substantially horizontal to the ground surface as shown in FIG. The relay station device 1 is installed so that radio waves can be transmitted and received toward the direction of the parabona antenna 11c on the terminal station side of the relay station device 1.

As shown in FIG. 2, a history management computer 1 for managing usage history such as the connection status of each user via the hub 12 together with the master unit 4 as shown in FIG.
IEEE802.3 / 10base, which is a communication standard
T, the usage status information of each user appropriately output from the master unit 4 is stored as a history in a user database formed in a storage device inside the history management computer 13. The history management computer 13 is installed at a predetermined position in the condominium together with the master unit 4.

The history management computer 13 is also connected to the Internet network like the computer 6, and periodically transmits history information based on the usage status information of each user to the management computer 1 of the management center. I can do it.

The arrangement of the parabolic antennas 11a to 11d of the gate station terminal 2, the relay station device 1, and the terminal station terminal 3 will be described with reference to FIG. 8. In the present embodiment, the parabolic antennas 11a to 11d are Although it is installed on the roof of a building or the like with a good location, the location of the building where the relay station device 1 is installed is shown in FIG.
As shown in (c), the relay station device is located on the roof of a building located on a straight line connecting the building where the parabolic antenna 11a of the gate station terminal 2 is installed and the building where the parabolic antenna 11d of the terminal station terminal 3 is installed. 1 parabona antenna 11
If b and 11c are installed so as to be opposed to the parabona antennas 11a and 11d, the radio wave output from the parabona antenna 11a and the radio wave output from the parabona antenna 11c may reach the parabona antenna 11d, thus involving perspective. In a case where two spread radio waves reach the same receiving station, in the spread spectrum wireless communication system used in the present embodiment, the parabona antenna 11a is used.
The output radio wave from the
As shown in FIG. 8 (a), the parabona antennas 11b and 11c of the relay station device 1 are installed because there is a near-far problem in so-called spread spectrum in which the reception condition at the terminal station terminal 3 of d is significantly reduced. The position of the building where the parabolic antenna 11a of the gate station terminal 2 is installed and the parabolic antenna 11 of the terminal station terminal 3 are determined.
A building is selected and installed at a position slightly deviated from a straight line connecting the building to which d is installed, and a predetermined direction is set so that the directivity directions of the parabona antennas 11b and 11c are not on the same straight line. It is preferable to install so as to have an angle θ.

As shown in FIG. 8C, the building provided with the parabolic antennas 11b and 11c of the relay station device 1 is different from the building provided with the parabolic antenna 11a of the gate station terminal 2 and the terminal station terminal 3. Since the distance between the gate station terminal 2 and the terminal station terminal 3 can be maximized when the building is located on a straight line connecting the building in which the parabona antenna 11d is installed, the relay station apparatus 1 is considered from the viewpoint of these distances, for example. Is required to be a building located on a straight line connecting the building and the building, since there is a predetermined area on the roof of the building, the area is used as shown in FIG. It is preferable to install the antenna so that the angle θ is as large as possible so that the directivity directions of the parabona antennas 11b and 11c are not on the same straight line.

Next, the formation of cells by the base unit 4 connected to the terminal station terminal 3 will be described. As shown in FIG. Four antennas 40a to 40 for each
d is installed so as to have a predetermined angle at the approximate center of each upper side near the roof outer periphery of each side wall.

The antennas 40a to 40d for the master unit used in this embodiment are provided with a reflecting rod on one side of a dipole antenna which is a non-directional antenna.
It is a directional antenna that outputs radio waves concentrated only on one side of the dipole antenna.

The arrangement of the antennas 40a to 40d will be described in more detail. The plurality of directional antennas have the maximum directivity in the horizontal direction of each of the directional antennas 40a to 40d. It is preferable to arrange the antennas at an angle. Specifically, as shown in FIG. 5, when the four antennas 40a to 40d are installed corresponding to the respective side walls, the directivity directions of the antennas are different from each other. It is preferable to install the device at a position at 90 degrees where the angle to be performed is maximized, but the present invention is not limited to this.

In addition, as shown in FIG. 5, the maximum communication distance based on the radiation angle of the radio wave which the antenna 40 has in the vertical direction is the largest as shown in FIG. These angles may be set as appropriate based on the radiation angle of radio waves in the vertical direction of the antenna to be used.
It is preferable to set it in the range of 60 degrees.

In this embodiment, the four antennas 4
As shown in FIG. 7, the antennas 0a to 40d branch the high-frequency radio wave input from the branch source to each branch side, and the high-frequency radio wave inputs input from each branch side are superimposed on each other and can be output to the branch source. The high-frequency distributor 14 is connected to the master unit 4 using two stages, and the radio wave output from the master unit 4 is split and divided into antennas 40a to 40d.
On the other hand, the radio wave output transmitted by the slave unit 5 is received by the antennas 40a to 40d, and the gains a to d of the antennas 40a to 40d are superimposed and input to the master unit 4. It has become.

As described above, the antennas 40a to 40d are provided on each side wall of the apartment building, and the antennas 40a to 40d are connected to the master unit 4 via the high-frequency distributor 14. However, the present invention is not limited to this.

Each of these antennas 40a to 40d
The configuration of the master unit 4 used in this embodiment to which
As shown in the figure, the configuration of the gate station terminal 2 and the terminal station terminal 3 is almost the same, and the hub 12
Terminal station 3 and IEEE802.3 / 10ba
a communication unit 8 for performing data communication in seT, a spread-spectrum wireless modem 10 for performing two-way wireless communication with the slave unit 5 by spread-spectrum communication as described above, and a control for performing operation control of the master unit 4 A microcomputer (MPU) 9;
A buffer memory 16 capable of temporarily storing data and the like to be transmitted / received is built in, and the feature thereof is that the internal memory of the control microcomputer (MPU) 9 includes:
Based on the slave unit data table registered in the EEPROM which is a non-volatile memory, it is programmed to change the communication speed of each slave unit 5, forcibly disconnect the connection, and detect an abnormality of the slave unit 5, Each master unit 4 is assigned an address on the Internet network, and the contents of the slave unit data table can be rewritten based on a data rewriting instruction from the management computer 1 transmitted together with the address. ing.

The configuration of the slave unit 5 that communicates with the master unit 4 is the same as that of the master unit 4 except that the control program executed by the control microcomputer (MPU) 9 is changed for the slave unit. The configuration is almost the same, and an ID, which is a unique identification code capable of identifying each of the slaves 5, is assigned to the slaves 5 that can be connected to the master 4 in the same cell.

The spread spectrum wireless modem 10
The predetermined spreading code sequence used in the spectrum spreader 19 and the spectrum despreader 25 is the same between the master unit 4 and the slave unit 5 and the gate station terminal 2 and the terminal station terminal 3 that perform wireless communication with each other. However, in this embodiment, in order to realize high-speed data communication, the spectrum communication is also performed in the wireless communication between the gate station terminal 2 and the terminal station terminal 3. In this embodiment, in order to reduce or eliminate the influence of the communication of the present invention, the base station 4 and the terminal station terminal 3 use different spreading coefficient sequences as correlation codes that are similarity indices. These spread code sequences having a low correlation coefficient value with each other are generated in an M-sequence code generated by using a shift register having a predetermined number of digits. Code sequences such as obtained when shifted appropriately is illustrated. However, when the frequency band used for the wireless communication between the gate station terminal 2 and the terminal station terminal 3 and the frequency band used for the wireless communication between the master unit 4 and the slave unit 5 are significantly different from each other, Since the adverse effect on the communication can be eliminated, the same spread code sequence may be used.

The master unit 4 is provided with a multiple access function for enabling simultaneous connection with a plurality of slave units 5 existing in the cell. These multiple access methods include:
The transmission path is divided into a plurality of frames having a predetermined data length, and this frame is implemented by time division multiplexing in which each frame is assigned to each slave unit.
Is carried out by transmitting the ID data individually assigned to each slave unit 5 at the beginning of the frame.
Indicates that when the ID data transmitted at the beginning of the frame matches its own ID, the frame is assigned to itself, and it is determined that an inquiry has been made as to whether transmission data exists. In addition to outputting the transmission data transmitted from the base unit 4 to the connected computer 6, if there is data to be transmitted to the base unit 4, detection of the symbol data existing in the frame is performed. Subsequently, data is transmitted until the end of the frame, and when there is no data to be transmitted, predetermined data indicating that there is no transmission data is transmitted.

As described above, it is necessary to sequentially assign the slave units 5 for communication for each frame and to transmit the ID data as an inquiry about the presence or absence of data to be transmitted in the frame.
Even when the child device 5 can communicate with the parent device 4, but is in a “hidden child device” state where the other child devices 5 cannot receive the radio wave transmitted by the other party due to the presence of an obstacle such as a wall, both the child devices 5
It is preferable that a collision occurs in which retransmission is frequently performed at the same time and frequent retransmissions occur, so that the communication capability can be prevented from remarkably lowering. At the same time, multiple access by the plurality of slave units 5 becomes possible. It is not always necessary to use the method, and the multiple access method is a method other than time division multiplexing, for example, the frequency used for communication is different for each slave unit, or the spreading code sequence is In the case of performing the multiplexing by code multiplexing or the like in which multiplexing is performed with different correlation coefficients being low for each machine, inquiries by transmitting these ID data are performed in an appropriate order, and the transmission data is transmitted. When a reply indicating that there is no ID is sent, the inquiry may be performed by shifting to transmission of other ID data.

The antenna 4 connected to these slave units 5
The slave unit antenna 50 for transmitting and receiving the radio wave of 0 is a disk type in which a planar antenna is embedded in a resin-made disk-shaped casing. As shown in FIG. As a position near the window facing the side wall of the apartment, which is a building where the antennas 40a to 40d are installed, it is possible to wirelessly communicate with each of the antennas mounted on the roof for each side wall on the balustrade of each house. The sub-unit antenna 50 is connected to the sub-unit 5 existing in the apartment room via a high-frequency cable.

As described above, the slave unit antenna 50 is connected to the slave unit 5.
Separately from the above, installation on the balustrade of the veranda is preferable, as described above, since wireless communication with each of the antennas 40a to 40d mounted on the roof for each side wall can be satisfactorily performed. However, the present invention is not limited to this, and the child device 5 and the child device antenna 50 may be integrated.

In this embodiment, the slave unit antenna 50 is used.
Is a disk-shaped antenna using a planar antenna. However, this is because the antenna is installed on a veranda or the like of a general household, so that the slave unit 5 is not a rod-shaped antenna. Although there is a possibility that the user may be injured by mistake, it is preferable because the possibility of these injuries can be significantly reduced, but the present invention is not limited to this.

In the present embodiment, as an example of the position near the window facing the side wall of the apartment, the slave unit antenna 5 is used.
Although the example in which 0 is provided on the balustrade of the veranda is shown, the present invention is not limited to this,
0 may be provided at a position inside the room of the window portion facing the side wall of the apartment, and the installation position of these slave unit antennas 50 is particularly limited as long as the position is near the window portion facing the side wall of the apartment. Not something.

As described above, the embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to these embodiments, and changes and additions may be made without departing from the gist of the present invention. Needless to say, the present invention is included in the present invention. For example, in the above-described embodiment, the terminal station terminal 3 is provided separately from the master unit 4 which is a communication unit with the computer 6, but the present invention is not limited to this. They may be provided inside the same device.

[0056]

The present invention has the following effects. (A) According to the first aspect of the invention, by using the highly directional antenna, it is possible to concentrate a limited radio wave output only in a predetermined directional direction, so that relaying in wireless communication is performed. Not only can the distance be longer, but also the spread of radio waves used between the highly directional antennas can be significantly suppressed, so that mutual communication in the relay interferes with each other and causes interference. Can be significantly suppressed, and a decrease in the communication capacity due to the interference can be significantly reduced.

(B) According to the second aspect of the present invention, since the parabona antenna can obtain extremely high directivity at low cost, the system can be constructed at low cost.

(C) According to the third aspect of the present invention, it is possible to use the same frequency in both wireless communications for relaying, thereby saving frequency resources.

(D) According to the invention of claim 4, an increase in data errors due to relay can be greatly reduced.

(E) According to the fifth aspect of the present invention, by using radio waves of different frequency bands for each high directivity antenna, a reduction in communication capacity due to interference can be avoided even if reflection or the like occurs. it can.

(F) According to the invention of claim 6, the optimum frequency can be set reliably and easily.

(G) According to the seventh aspect of the present invention, not only is it possible to perform stable communication that is less susceptible to multipath due to reflection of a building or the like than normal narrow-band modulation communication, but also can perform normal narrow-band modulation communication. Communication at higher speed can be performed as compared with modulation communication.

(H) According to the invention of claim 8, there is no need to install a communication cable or the like for connection with the computer terminal, and communication with these computer terminals is formed simply and at low cost. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an Internet connection system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a gate station terminal, a relay station terminal, and a terminal station terminal for connecting each cell to the Internet network by wireless communication in the Internet connection system according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a gate station terminal and a terminal station terminal used in the embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a relay station device used in an embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a cell in the Internet connection system according to the embodiment of the present invention.

FIG. 6 is a diagram showing an arrangement state of each antenna in a cell of the Internet connection system according to the embodiment of the present invention.

FIG. 7 is a diagram showing a connection state between a master unit and each antenna in the Internet connection system according to the embodiment of the present invention.

8 (a), (b), and (c) are diagrams showing arrangement states of respective antennas of a gate station terminal, a relay station terminal, and a terminal station terminal.

FIG. 9A is a diagram showing setting contents in a relay station terminal used in the embodiment of the present invention. (B) is a diagram showing a channel setting mode used in the embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a master unit used in the embodiment of the present invention.

[Explanation of symbols]

 1 relay station device 2 gate station terminal 3 terminal station terminal 4 master (master terminal) 5 slave (slave terminal) 6 computer 7 gateway server 8 communication section 9 control microcomputer (MPU) 10 spread spectrum wireless modem 11a Parabona antenna (for gate station terminal) 11b Parabona antenna (for relay station apparatus) 11c Parabona antenna (for relay station apparatus) 11d Parabona antenna (terminal station terminal) 12 Hub 13 History management computer 14 High frequency distributor 15 EEPROM (Non-volatile memory) 16 buffer memory 17 base band processor 18 modulator 19 spectrum spreader 20 band pass filter (BPF) 21 intermediate amplifier 22 power amplifier 23 band pass filter (BPF) 24 receiving amplifier 25 spectrum despreader 26 band pass filter Filter (BPF) 27 intermediate amplifier 28 demodulator 29 intermediate frequency oscillator 30 local oscillator 31 antenna switch 32 setting input unit 33 setting input unit 34 control microcomputer (MPU) 35 optical cable modem 40a (directivity) antenna (for master unit) 40b ( (Directivity) antenna (for master) 40c (Directivity) antenna (for master) 40d (Directivity) antenna (for master) 50 (For slave) antenna 100 Management computer

Claims (8)

[Claims] 1. A terminal station terminal having data communication means for performing data communication with at least one computer terminal existing in a predetermined area, a gate station terminal connected to the Internet network for data communication, and the gate terminal At least one relay station device for enabling wireless two-way data communication between the central office terminal and the terminal office terminal, wherein the computer terminal can be connected to the Internet network. An internet connection system, wherein the terminal station terminal, the gate station terminal, and the relay station device have a highly directional antenna capable of outputting radio waves only in a very limited predetermined direction, and perform a high-directional antenna for wireless communication. An internet connection system, characterized in that they are provided so that their directivities face each other. 2. The Internet connection system according to claim 1, wherein said highly directional antenna is a parabona antenna. 3. The Internet connection system according to claim 1, wherein the two highly directional antennas of the relay station device are provided so that their directivity directions are not on the same straight line. 4. The modulation and demodulation method, wherein the relay station device demodulates radio waves received by one high directivity antenna into digital data, modulates the digital data again, and transmits the digital data from the other high directivity antenna. Claim 1 comprising a part
4. The Internet connection system according to any one of items 1 to 3. 5. The Internet connection system according to claim 4, wherein said relay station device is capable of transmitting and receiving radio waves of different frequency bands for each of the highly directional antennas. 6. The Internet connection according to claim 5, wherein the relay station device includes frequency setting means for setting a difference in frequency between each of the high directivity antennas to be as large as possible. system. 7. The two-way wireless data communication method is a spread spectrum communication method in which a narrow band base band signal on which transmission data is superimposed by a predetermined modulation method is spread over a wide band and transmitted. The Internet connection system according to any one of claims 1 to 6. 8. A data communication means for performing data communication with a computer terminal in said terminal station terminal, comprising:
A slave terminal connected to the slave terminal, and a master terminal connected to the terminal station terminal, capable of wirelessly performing bidirectional data communication with the slave terminal in a non-contact and simultaneous parallel manner. The Internet connection system according to any one of claims 1 to 7, wherein the Internet connection system is formed by: