JP2006173862A - Wireless communication system and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system in which the installation work for eliminating the blind zone of wireless communication is facilitated, transmission/reception can be carried out for both different frequency band and communication system of digital simple telephone, portable telephone, and the like, and installation cost of a base station is prevented from increasing in a closed space. <P>SOLUTION: The wireless communication system comprises a base station including a section having an antenna of leakage coaxial cable and transmitting/receiving data to/from a wireless communication terminal by wireless communication, a terminal information database storing inherent information containing identification information of the wireless communication terminal, and a base controller for detecting a connection request to the base from the wireless communication terminal, detecting the identification information of both connection request source and destination with reference to the terminal information database when a connection request is detected, and connecting the line between the connection request source and destination when the identification information of both connection request source and destination is confirmed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention uses a mobile communication terminal (wireless communication terminal) such as a PHS (registered trademark), 2.4 GHz band, or 5 GHz band that is used outdoors, and a LAN (local area network) or a WAN (wide area network). The present invention relates to a wireless communication system that performs voice and data communication in an underground shopping center or a building using the IP (Internet Protocol) communication infrastructure.

Conventionally, in the above-described wireless communication, walls, furniture, pedestrians, and the like are obstacles in an underground shopping center or building, and a large propagation loss occurs with respect to propagation of radio waves in space.
For this reason, conventionally, a large number of base station apparatuses with dipole antennas are arranged at intervals of about 40 to 80 m in order to perform efficient wireless communication in underground malls and buildings (see, for example, Patent Document 1). ).
Japanese Patent Laid-Open No. 08-204421

However, since the radio base station apparatus shown in Patent Document 1 uses a dipole antenna, in the installation process, it is necessary to specify a dead zone by a prior spatial propagation measurement and to install a dipole antenna to supplement the dead portion. There is a disadvantage that it is necessary.
For this reason, in the said radio | wireless communications system, it takes time for the prior | preceding radio wave propagation investigation and the operation | work which installs many dipole antennas, and becomes a factor which increases expense.
In addition, in the radio base station apparatus, there is a problem that communication quality is significantly deteriorated due to a change in the arrangement of fixtures or the approach / movement of a pedestrian, and in some cases, it is difficult to maintain a call.

Further, the above wireless communication system can be used only for wireless communication in a specific frequency band. For example, the wireless communication system can be used only for any one of a digital simple telephone represented by PHS (registered trademark), a mobile phone, a wireless LAN, and the like. Not supported.
Therefore, since the wireless communication system uses a plurality of wireless communication terminals having different frequency bands in a closed space, it is necessary to provide a base (transmitter / receiver) corresponding to each communication system. Cost increases.

  The present invention has been made in view of such circumstances, can easily perform installation work to eliminate the dead zone of wireless communication, and can be applied to both different frequency bands and communication systems such as digital simple telephones and mobile phones. An object of the present invention is to provide a wireless communication system and a wireless communication method capable of corresponding transmission / reception and preventing an increase in the cost of installing a base in a closed space.

  The invention according to claim 1 is a wireless communication system having a leaky coaxial cable antenna, a base having a transmission / reception unit for transmitting and receiving data by wireless communication with a wireless communication terminal, and identification information of the wireless communication terminal. A terminal information database in which unique information is stored, and the presence or absence of a connection request from a wireless communication terminal to the base is detected. When a connection request is detected, the terminal information database is referred to, and a connection request source and a connection request destination The base controller for detecting the presence / absence of both identification information and connecting the lines between the connection request source and the connection request destination when both identification information is confirmed.

  According to a second aspect of the present invention, in the wireless communication system according to the first aspect, the transmission / reception unit transmits / receives data to / from a plurality of wireless communication terminals each having a different transmission / reception frequency band.

  According to a third aspect of the present invention, there is provided a transmission / reception process in which a transmission / reception unit transmits / receives data by wireless communication with a wireless communication terminal via an antenna of a leaky coaxial cable at a base, and unique information including identification information of the wireless communication terminal. The process of storing in the terminal information database, and when the base control device detects the connection request from the wireless communication terminal to the base, and detects the connection request, the terminal request database and the connection request are referred to the terminal information database. The presence or absence of both pieces of identification information is detected, and when both pieces of identification information are confirmed, there is a process of connecting a line between the connection request source and the connection request destination.

As described above, according to the present invention, in a conventional PHS (registered trademark) radio base, which is a mobile terminal in the 1.9 GHz band, the conventional dipole antenna has a trouble in a distance of about 40 m. In contrast to a certain noise level of MOS (voice quality evaluation) value of 3 level, according to the present invention, a leaky coaxial cable is used as an antenna, so that an antenna having a cable length of about 400 m in one radio base station unit. 4 can be achieved in a closed space where this cable is provided, and the transmission / reception area can be expanded with a small number of base stations.
In addition, according to the present invention, since it is configured to be compatible with wireless communication terminals having different transmission / reception frequency bands, such as digital simple telephones and mobile phones, capital investment for installing a base using a wireless communication terminal in a closed space Can be reduced.

The present invention transmits and receives data by wireless communication with a mobile terminal (wireless information terminal 6 to be described later), for example, a digital simple telephone such as PHS (registered trademark) in an extension system such as private communication. At this time, a transmission / reception antenna for transmitting a transmission signal and receiving a reception signal is formed by wireless communication using a leaky coaxial cable (LCX).
Hereinafter, a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of the embodiment.

In this figure, a base 1a is provided in a closed space S, and has an interface unit 2a, a transmission / reception unit 3a, and a storage unit 4a, and the base controller 5 and ISDN are connected via the interface unit 2a. Connected to the digital line 6.
In addition, the base 1b is provided in the closed space T, and has an interface unit 2b, a transmission / reception unit 3b, and a storage unit 4b, like the base station 1a, and the interface control unit 5 and ISDN are provided by the interface unit 2a. Are connected to a digital line 6.

The transmission / reception units 3a and 3b have LCX antennas 7a and 7b corresponding to different frequency bands, respectively, and a plurality of radio information terminals of different frequency bands, for example, radio information terminals 8a and 8b (digital simple telephone) and radio Data is transmitted to and received from the information terminals 9a and 9b.
The transmission / reception units 3a and 3b have a plurality of communication channels for establishing a line. In this communication channel, a communication line between wireless information terminals is established, and information (voice call and data) between the wireless information terminals is established. Transfer data).

Here, when the transmission / reception units 3a and 3b receive connection request signals transmitted from the wireless information terminals via the LCX antennas 7a and 7b, the transmission / reception units 3a and 3b classify the signals input by a frequency filter or the like, And the telephone number included in the signal is extracted.
As will be described later, the transmission / reception units 3a and 3b perform transmission / reception processing corresponding to the frequency band and communication method of each wireless information terminal based on the unique information of the wireless information terminal transmitted from the base control device 5.

Further, when a connection request from the wireless information terminal to another wireless information terminal is input, the transmission / reception units 3a and 3b send a connection request source telephone number (identification information) and a connection request to each of the storage units 4a and 4b. Write and memorize the previous phone number.
The base control device 5 and the terminal information database 10 are installed in a service center or the like that provides a service that enables a digital simple phone and a mobile phone to be used in a closed space where external radio waves do not reach.

The storage units 4a and 4b are configured to store a plurality of telephone numbers of wireless information terminals that have made connection requests, and sequentially accumulate data in a FIFO (First IN First Out) request table.
Here, when there is no space in the request tables of the storage units 4a and 4b, the transmission / reception units 3a and 3b transmit a signal indicating that the connection request is rejected, that is, waiting for connection, to the wireless information terminal that has requested connection.

The storage units 4a and 4b have detection tables in which telephone numbers of wireless information terminals that are within a range in which the transmission / reception units 3a and 3b can transmit and receive are recorded.
Here, the transmission / reception units 3a and 3b delete the data in the detection table at regular intervals, transmit a broadcast signal by each of the compatible frequency signals and communication methods, and transmit the response signal. A process of writing the telephone numbers in the detection tables of the storage units 4a and 4b is performed.

The base control device 5 searches the storage contents of the storage units 4a and 4b at predetermined time intervals (for example, several microseconds), and the telephone numbers in the request table are stored in the storage units 4a and 4b of the bases 1a and 1b. If the telephone number is detected, the connection request source and connection request destination telephone numbers are read out.
In addition, the base control device 5 detects whether or not the telephone numbers of both the terminal information databases 10 are registered, and when detecting that both are registered in the request table, the base information of the connection request source A line connection permission signal is output to the base having the transmission / reception unit requested by the terminal and the base having the transmission / reception unit capable of communicating with the connection information request destination wireless information terminal, and the connection request source and connection request destination wireless Establish a line between information terminals.

The terminal information database 5 is connected to the base station control device 1 and has a plurality of identifications such as wireless information terminals 8a, 8b9a, 9b, etc. that are permitted to perform intercommunication services for voice calls and data transmissions, for example, extension calls. Unique information including information is stored for each wireless information terminal.
In the terminal information database 5, for example, when the wireless information terminal is a digital simple telephone or a mobile phone, the identification information is a telephone number. Information such as type of subscriber (provider providing communication service for mobile phone and digital simple phone), type of digital simple phone or mobile phone, new registration, continuation, temporary suspension, cancellation, etc. ing.
In addition, the unique information of the wireless information terminal registered in the terminal information database 5 is sequentially changed by the communication operator of the wireless information terminal or the administrator who manages the base control device 5 by changing the registered content. .

Further, as described above, the above-mentioned LCX antennas 7a and 7b are provided in closed spaces S and T in an underground mall, a tunnel, or the inside of a building where radio waves are difficult to reach from an open space, and are disposed at predetermined positions. It is formed by the leaked coaxial cable.
For example, when an access point with an antenna is installed on the ceiling in a store in an underground shopping center, the radio waves transmitted by both the access point and the wireless information terminal are used in places that are in the shadows of furniture and people. Since only a straight wave can be used for communication, there are many areas that become a dead band of radio waves, and it is difficult to make radio waves reach each other with sufficient strength to withstand communication.

On the other hand, in the embodiment of the present invention, the LCX (leakage coaxial cable) antennas 7a and 7b are provided not only in a straight shape but also in a bent shape on the back of the ceiling or the like. Since the wave arrives, it becomes a state where there is substantially no place that becomes a shadow of a fixture or a person, that is, a dead zone of radio waves.
The LCX antennas 7a and 7b are provided with a plurality of slits, for example, every several meters, and each slit has a function of an antenna, so that radio waves are transmitted from a plurality of locations. Unlike the case where a wave source or a line wave source is radiated onto a spherical surface from a single point as in a normal antenna, the power spread is gradual, so that the communication distance is extended compared to a normal antenna.

  The LCX antennas 7a and 7b have frequency bands that can be transmitted and received in the 800 MHz band (mobile phone (PDC)), 1.9 GHz band (digital simple telephone such as PHS (registered trademark)), 2.4 GHz band (wireless LAN ( IEEE802.11b)), 5 GHz band (IEEE802.11b)), ultrahigh frequency (or quasi-microwave: 300 MHz to 3 GHz), or all or a combination thereof.

  The LCX antennas 7a and 7b have a plurality of leakage hole (slot) pairs having a predetermined shape and spacing corresponding to each frequency band used for wireless communication with each wireless information terminal as shield conductors (that is, external conductors). Have.

Next, the operation of the wireless communication system according to the embodiment of the present invention will be described with reference to FIG.
In the closed space S, the user inputs the telephone number of the connection destination to the wireless information terminal 8a, and makes a call request (connection request) to the wireless information terminal 9b in another closed space T, for example.
Thereby, the wireless information terminal 8a adds its own telephone number (connection request source telephone number) and the connection request destination wireless information terminal 9b to the call request signal and transmits the call request signal from the antenna. .

And since the radio | wireless information terminal 8a exists in the closed space S and can communicate with the transmission / reception part 3a of the base 1a, the transmission / reception part 3a receives the signal of the said call request | requirement via the LCX antenna 7a, and a memory | storage part In 4a, the telephone number of the wireless information terminal 8a as the connection request source and the telephone number of the wireless information terminal 9b as the connection request destination are written.
Then, the base control device 5 sequentially searches the storage units (4a, 4b) of each base every predetermined period, and detects whether or not a telephone number is written in the request table of each storage unit.

And if the base control apparatus 5 detects that the telephone number of the radio | wireless information terminals 8a and 9b is written in the memory | storage part 4a, this will be read from the request table of the memory | storage part 4a.
Next, the base control device 5 refers to the terminal information database 10 and detects whether or not the telephone numbers of the wireless information terminals 8a and 9b are both written (registered).
At this time, when the base control device 5 detects that neither of them is written, the base control device 5 outputs control information for refusing the connection of the line to the transmission / reception unit 3a of the base 1b.
Thereby, the transmission / reception unit 3a disconnects communication with the wireless information terminal 8a after sending a notification that the line connection is impossible to the wireless information terminal 8a.

On the other hand, when the base control device 5 detects both the telephone numbers of the wireless information terminals 8a and 9b in the terminal information database 10, it detects that both are registered in this service, and the wireless information terminal 9b can communicate. Search for a base having a transmission / reception unit.
As a result, the base station server 3D connects the line with the wireless information terminal 6D and transmits an establishment confirmation signal indicating the establishment to the base station control device 1.

Then, the base station control device 1 searches the storage unit of each connected base, and detects whether or not the connection destination wireless information terminal 9b is described in the detection table.
When the base station controller 1 detects the telephone number of the wireless information terminal 9b in the detection table of any of the connected bases, for example, the detection table of the storage unit 4b of the base 1b, The presence / absence of establishment of a line with another wireless information terminal is detected, and if not established, a control signal for permitting establishment of the line is output to the transmission / reception units 3a and 3b.

At this time, the base station control device 1 refers to the terminal information database 10 and extracts a communication carrier from each telephone number of the wireless information terminal 8a and the wireless information terminal 9b, and a communication frequency corresponding to each communication carrier. Information such as a bandwidth and a communication method is detected, and this information is transmitted to the transmission / reception units 3a and 3b that can communicate with the respective wireless information terminals.
As a result, the transmission / reception units 3a and 3b each allocate a predetermined radio channel, and based on information such as the frequency band and communication method of the corresponding carrier, via the digital line 6 according to the corresponding frequency band and communication method. The line connection between the wireless information terminals 8a and 9b is performed.

Here, for example, since the wireless information terminal 8a is a digital simple telephone, the transmission / reception unit 3a communicates with the communication company's station via the digital line 6 according to the frequency band and communication method of the digital simple telephone of the communication company. Since the wireless information terminal 9b is a mobile phone, the transmitter / receiver 3b transmits / receives data to / from the communication operator's station via the digital line 6 according to the frequency band and communication method of this operator's mobile phone. Send and receive.
As a result, the line between the wireless information terminal 8a and the wireless information terminal 8b is connected via the transmission / reception units 3a and 3b.

On the other hand, the base station control device 1 determines that the wireless information terminal 9b has already connected a line with another wireless information terminal when the telephone number of the wireless information terminal 9b is not confirmed in the detection table of the storage unit of any base. If so, the control information for rejecting the line connection is output to the transmitting / receiving unit 3a of the base 1b.
Thereby, the transmission / reception unit 3a disconnects communication with the wireless information terminal 8a after sending a notification that the line connection is impossible to the wireless information terminal 8a.

It is a block diagram which shows the structural example of the radio | wireless communications system by one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b ... Base 2a, 2b ... Interface part 3a, 3b ... Transmission / reception part 4a, 4b ... Memory | storage part 5 ... Base control apparatus 6 ... Digital line 7a, 7b ... LCX antenna 8a, 8b, 9a, 9b ... Wireless information terminal 10 ... Terminal information database S, T ... Closed space

Claims (3)

A base having an antenna of a leaky coaxial cable and having a transmission / reception unit for transmitting and receiving data by wireless communication with a wireless communication terminal;
A terminal information database in which unique information including identification information of a wireless communication terminal is stored, and detecting the presence or absence of a connection request from the wireless communication terminal to the base, and when detecting a connection request, refer to the terminal information database, A base controller that detects the presence / absence of identification information of both the connection request source and the connection request destination, and connects the lines between the connection request source and the connection request destination when both identification information is confirmed. A wireless communication system.   The wireless communication system according to claim 1, wherein the transmission / reception unit transmits / receives data to / from a plurality of wireless communication terminals each having a different transmission / reception frequency band. A transmission / reception process in which a transmission / reception unit transmits and receives data by wireless communication with a wireless communication terminal via an antenna of a leaky coaxial cable at a base,
Storing unique information including identification information of the wireless communication terminal in the terminal information database;
When the base control device detects the presence or absence of a connection request from a wireless communication terminal to the base, and detects a connection request, the base control device refers to the terminal information database to determine the presence or absence of identification information of both the connection request source and the connection request destination. And a step of connecting a line between a connection request source and a connection request destination when both identification information is detected and confirmed.

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