JP2002077034A - Wireless communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless communication system that can solve the conventional problem of a synergistically summed noise resulting in causing deterioration in S/N and in amplifying an in-band unnecessary wave, extend a speech area of a base station while keeping communication quality, prevent occurrence of an interruption time of communication in the area and realize a 1 to 1 sure speech. SOLUTION: In the wireless communication system, a specific identification number is assigned to each of optical wireless repeaters 3-3-3 to 3-m-n, a central control unit 1 recognizes a traveling direction of a mobile unit 4 by an identification number included in incoming data received from base station units 2-2 to 2-m to instruct the base station units to select the optical wireless repeaters to transmit outgoing data, the wireless optical repeater that is resident in the end with respect to the base station unit connected thereto transmits outgoing data to the optical wireless repeater of the base station unit adjacent in the traveling direction of the mobile unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system such as a train radio system used for communication between crew members of trains and between crew members and station staff, and particularly to a communication area of a base station while maintaining communication quality. The present invention relates to a wireless communication system that can be expanded and can prevent the occurrence of interruption of communication within an area.

[0002]

2. Description of the Related Art Conventionally, as a communication means for communicating between crew members of each train and between train crew members and station staff, a train radio for performing communication in a set frequency band using a radio device mounted on the train has been known. Was used. A conventional wireless communication system such as a train wireless system used for communication between train crews will be described with reference to FIG. FIG.
FIG. 10 is a schematic block diagram of a conventional wireless communication system.

As shown in FIG. 3, a conventional radio communication system includes a central control device 1 ', a base station device 2', a relay device 7, a duplexer (DUP) 8, a mobile station 4 ',
Leaky coaxial cable (LCX cable: Leaky Coaxial cable)
Cable 6).

[0004] Next, each component of the conventional radio communication system will be described in detail. The mobile device 4 'is mounted on a train or the like, and performs wireless communication with the base station device 2' via the leaky coaxial cable 6 and the relay device 7.

[0005] The leaky coaxial (LCX) cable 6 is arranged linearly along the line and corresponds to an antenna on the side of the base station apparatus 2 'that transmits and receives radio signals to and from the antenna of the mobile station 4'. It is.

The repeater 7 repeats the signal while amplifying it to compensate for the loss of the transmission wave in the leaky coaxial cable 6, and connects to the end of the leaky coaxial cable 6 to expand the communication area. It is provided.

The duplexer 8 includes a leaky coaxial cable 6
This is a coupler capable of simultaneously transmitting and receiving a reception signal from the base station device 2 'to the base station device 2' and a transmission signal from the base station device 2 'to the leaky coaxial cable 6.

[0008] The base station device 2 'is arranged along the line, and controls communication with the mobile station 4' in the communication area.

The central control unit 1 'performs overall control of the base station apparatus 2', and monitors between the mobile units 4 ', or between the mobile unit 4' and the central control unit 1 '(not shown), or the like, or It controls communication with a communication device (not shown) in a station staff room, such as a station platform, which is fixedly connected from the central control device 1 '.

Next, the operation of the conventional wireless communication system will be described. In a conventional wireless communication system, under the communication control of a central control unit 1 ', a mobile station 4'
Is transmitted from the leaky coaxial cable 6 to which the relay device 7 is connected, and an uplink signal from the mobile device 4 to the base station device 2 ′ is received from the leaky coaxial cable 6. And in the conventional wireless communication system,
In order to expand the communication area in the base station device 2 ', a relay device 7 is connected to the end of the leaky coaxial cable 6,
A method of connecting this configuration in series (cascade) has been adopted.

Further, in the conventional radio communication system, since communication is performed simply by setting a frequency band between a train and another train, a train other than the corresponding train is also established, and communication with other trains is established. Will also hear the content of the communication.

A conventional radio communication system such as a train radio system used for train operation and the like is disclosed in JP-A-11-289576, published on October 19, 1999, entitled "Wireless Communication Control Method and Wireless communication system "(applicant: Kokusai Electric Inc., inventor: Kikuo Hiiro). According to this conventional technique, a radio communication control method and a radio communication method in which base stations managing an area all use the same frequency, allocate channels to time-divided slots in each base station, and perform mobile station transmission / reception in the frequency slot. This is a communication system, whereby handoff can be quickly performed even if there is no overlap between communication areas of each base station.

[0013]

However, in the above-mentioned conventional wireless communication system, the set of the relay device 7 and the leaky coaxial cable 6 is connected in series (cascade) in order to expand the communication area of the base station. There is a problem that noise generated in the repeater 7 is multiplied and added to cause a deterioration of a signal-to-noise ratio, and an in-band unnecessary wave due to odd-order intermodulation generated in an amplifier of the repeater 7 is amplified. .

Further, in the above-mentioned conventional wireless communication system,
Instead of one-to-one communication with a unique communication partner (train), other trains can hear the communication content, and the call is confused,
There was a problem that the usability was poor.

[0015] The present invention has been made in view of the above-mentioned circumstances, and expands a communication area of a base station while maintaining communication quality, and prevents occurrence of interruption of communication within the area. It is an object of the present invention to provide a wireless communication system capable of realizing a reliable telephone call.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a central controller for controlling communication in a system, and at least one central controller connected to the central controller.
A wireless communication system comprising: one base station device; and at least one optical wireless relay device that is connected in parallel to each base station device via an optical cable, is linearly arranged, and performs wireless communication with a mobile device that linearly moves in one direction. In the system, a unique identifier is assigned to each optical wireless relay device, and the uplink data transmitted via each optical wireless relay device is transmitted with an identifier added thereto, and the central control device, Since it is a central control unit that recognizes the traveling direction of the mobile station based on the identifier included in the uplink data from the base station and instructs the base station apparatus to transmit an optical wireless relay device that transmits downlink data according to the recognized traveling direction, The communication area of the base station device can be expanded while maintaining the quality, and the occurrence of communication interruption time due to the switching of the optical wireless relay device within the area can be prevented.

Further, according to the present invention for solving the above-mentioned problems of the conventional example, the central control unit recognizes the traveling direction of the mobile station based on the identifier included in the uplink data from the base station, and includes the information in the uplink data. When the optical wireless relay device having the identifier is the terminal optical wireless relay device in the connected base station device, the optical wireless relay device of the adjacent base station device also goes down in the traveling direction of the mobile station. Since the central control device instructs the base station device to transmit data, the base station device can be smoothly switched (handed off) even when moving between communication areas, and the occurrence of communication interruption time is prevented. be able to.

According to another aspect of the present invention, there is provided a wireless communication system according to the first or second aspect, wherein the central control unit assigns the number of the operation time to the data of the mobile unit. While recognizing the position and traveling direction of the moving mobile device by the mobile device identification number added to the unique number,
Understands the running status of multiple mobile devices, and if a request to establish communication from any mobile device to another mobile device is specified in accordance with the running status, the connection is established according to the recognized running status. Since it is a central control device that specifies the mobile device identification number of the previous mobile device and performs control to establish communication, by specifying the communication establishment request destination in a form that matches the driving situation, it is easy and easy to understand operation. One-to-one reliable communication can be realized, and usability can be improved.

[0019]

Embodiments of the present invention will be described with reference to the drawings. A wireless communication system according to the present invention includes a central controller for controlling communication in the system, at least one base station connected to the central controller, and linearly connected to each base station in parallel with an optical cable. A wireless communication system that is arranged and has at least one optical wireless relay device that performs wireless communication with a mobile device that moves linearly in one direction, wherein each optical wireless relay device is assigned a unique identifier. An identifier is added to the uplink data transmitted through each optical wireless relay device and transmitted.The central controller recognizes the traveling direction of the mobile device with the identifier included in the uplink data from the base station, and is recognized. Since the central control unit instructs the base station apparatus to transmit an optical wireless relay apparatus that transmits downlink data according to the moving direction, the communication area of the base station apparatus can be expanded while maintaining communication quality. And it is possible to prevent the disconnection of the time occurrence of a communication with the optical wireless relay device switching in the area.

Further, a wireless communication system according to the present invention comprises:
The central control unit recognizes the traveling direction of the mobile station based on the identifier included in the uplink data from the base station, and the optical wireless relay device with the identifier included in the uplink data is connected to the terminal optical wireless terminal in the connected base station device. If the relay device is a relay device, the central control device instructs the base station device to transmit downlink data also to the optical wireless relay device of an adjacent base station device in the traveling direction of the mobile device. The base station device can be switched (hand-off) smoothly even when the mobile station moves, and the occurrence of communication interruption time can be prevented.

[0021] The wireless communication system according to the present invention comprises:
The central control unit recognizes the position and traveling direction of the moving mobile device using the mobile device identification number obtained by adding the number obtained by digitizing the operation time to the unique number of the mobile device, and grasps the running status of a plurality of mobile devices. However, if a request to establish communication from any mobile device to another mobile device is specified in accordance with the driving situation,
It is a central control unit that specifies the mobile unit identification number of the mobile device of the connection destination according to the running conditions that are known and performs control to establish communication, so the communication establishment request destination is set in accordance with the running conditions. By the designation, a reliable one-to-one call can be realized by a simple and easy-to-understand operation, and the usability can be improved.

First, a schematic configuration of a wireless communication system according to the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a wireless communication system according to an embodiment of the present invention.
Parts having the same configuration as in FIG. 3 are described with the same reference numerals. As shown in FIG. 1, the wireless communication system according to the present embodiment includes a central control device 1, base station devices 2-1 to 2-m, and an optical system connected to each base station device 2. It comprises a wireless relay device (REP in the figure) 3-1 to an optical wireless relay device 3-n, a mobile device 4, an optical cable 5, and a leaky coaxial cable (LCX cable in the diagram) 6.

Next, each component of the wireless communication system according to the present invention will be specifically described. However, the leaky coaxial cable 6 is the same as the conventional one, and the description is omitted. Mobile device 4
Is mounted in a train running on the track and performs wireless communication with the base station device 2 in the same manner as in the related art, but in the present invention, the leaky coaxial cable 6 and the optical wireless relay device 3 Communicate and a unique identification number (mobile unit identification number)
have.

Here, the mobile unit identification number is a mobile unit identification number obtained by adding a number obtained by converting the operation time to a unique number (train number) for each train. For example, the departure time at the train departure station is a unique number (train number) for each train.
Is added to the train number (mobile device identification number) after the start of traveling. The mobile station identification number is stored in a memory (not shown) in the central control device 1, and is also stored in a memory (not shown) in the base station device 2 with which the mobile station communicated during the operation.

When communication from the mobile unit 4 of an arbitrary train to the mobile unit 4 of another train is performed, the communication is established by designating the mobile unit identification number. Explaining in a specific example, the unique number (train number) of the mobile device 4 mounted on the train A is “n”, and when this vehicle runs as “Hikari No. 1” starting at 8 am The identification number becomes “n1”. Then, when this train reciprocates and returns to the starting station, and then travels as “Hikari No. 5” departing at 13:00, the mobile device identification number becomes “n5”. As a result, it is easier for a train crew making a communication establishment request to make a connection request with a recognition that they want to contact the crew of "Hikari m-go" than a train number. There is an effect that can emit.

Further, a switch indicating a "front" (or "rear") train is provided on an operation unit (not shown) of the mobile unit 4,
By depressing the switch, it is possible to request establishment of communication with the mobile device 4 of the train running “before” (or “after”). For example, when the “previous” switch is pressed with any mobile device 4, the central control device 1 that transmits a request for establishing a train running on “previous” to the mobile device 4 and receives the establishment request, transmits The mobile device identification number of the mobile device 4 of the train running on "" is specified, and control is performed so that communication can be established. Thus, for example, when an emergency occurs and it is desired to immediately contact the crew of the following train, communication is immediately performed without knowing the mobile unit identification number of the mobile unit 4 mounted on the subsequent train. An establishment request is transmitted, and communication with a subsequent train can be quickly established under the control of the central control device 1.

The optical cable 5 transmits and receives optical signals, and connects the base station apparatus 2 and the optical wireless relay apparatus 3 to transmit and receive optical signals.

The base station device 2 is connected to the optical wireless relay device 3 by an optical cable, and is connected to the central control device 1 by wire. The mobile station 4 output from the central control device 1
Is converted into an optical signal and output to each optical wireless relay device 3 via the optical cable 5, and conversely, the upstream optical signal input from each optical wireless relay device 3 via the optical cable 5 is The signal is converted into a signal and output to the central control device 1 as uplink data. In each base station apparatus 2 of the present invention, the uplink data includes an identification number for identifying the optical wireless relay apparatus 3 that has received the signal from the mobile station 4 and outputs the signal to the central control apparatus 1. ing. Here, the identification number is added to each optical wireless relay device 3.
Or each base station device 2.
The base station devices 2-1 to 2-m have the same configuration.

The optical wireless relay device 3 is connected in parallel to the base station device 2 by an optical cable 6 and is linearly arranged along a line.
Is transmitted to the leaky coaxial cable 6 through the
The signal received by the leaky coaxial cable 6 is output to the base station device 2 via the optical cable 5. Each optical wireless relay device 3 is assigned a unique identification number (identifier) for identifying each, and each optical wireless relay device 3 holds the assigned identification number. 6 may be configured to add the identification number to the upstream data received from the portable device 4 via the optical cable 6 and output the data to the base station apparatus 2 via the optical cable 5. The optical wireless relay device 3-1-1 to the optical wireless relay device 3-1
-n, ..., optical wireless relay device 3-m-1 to optical wireless relay device 3-mn
Have the same configuration, and are assigned unique numbers. The optical wireless relay device 3-1-1 is the first optical wireless relay device 3 connected to the base station device 2-1.

The central control device 1 is connected to the base station device 2 by wire and controls communication in the system.
In particular, in the present invention, before the train starts running, the mobile device identification number of the mobile device 4 mounted on the train is stored in a memory (not shown), and the mobile device ID included in the uplink data received from the base station device 2 is stored. The device identification number and the identification number of the optical wireless relay device 3 are stored as operation management information, and the movement of the train, that is, the movement of the mobile device 4 is determined from the change in the identification number of the optical wireless relay device 3 to manage the operation status. At the same time, the optical wireless relay device 3 that transmits downlink data addressed to the mobile unit 4 of the train is controlled in accordance with the determined movement of the train.
A specific example of the control will be described later.

Next, a first configuration example inside the base station device 2 and the optical wireless relay device 3 in the wireless communication system of the present invention will be described as a first embodiment with reference to FIG. FIG. 2 is a block diagram showing a first embodiment inside the base station device 2 and the optical wireless relay device 3 in the wireless communication system of the present invention. The base station apparatus 2 according to the first embodiment in the wireless communication system of the present invention includes a receiver (Rx) 21, a transmitter (Tx) 22, an optical signal / electrical signal converter (O / E) 23, Signal / optical signal converter (E /
O) 24.

Next, each unit constituting the base station apparatus 2 according to the first embodiment of the wireless communication system of the present invention will be specifically described. The receiver (Rx) 21 receives an upstream signal from the optical wireless relay device 3 and outputs the same to the central control device 1, and is provided corresponding to the optical wireless relay devices 3-1 to 3-n. . The transmitter (Tx) 22 transmits a downstream signal from the central control device 1 to the optical wireless relay device 3, and is provided corresponding to the optical wireless relay devices 3-1 to 3-n.

Optical signal / electrical signal converter (O / E) 23
Converts an optical signal into an electric signal, and converts an optical signal received from the optical wireless relay device 3 via the optical cable 5 into an electric signal. The electric signal / optical signal converter (E / O) 24 converts an electric signal into an optical signal, and converts an electric signal received from the central control device 1 into an optical signal and outputs it to the optical cable 5. ing.

The optical wireless relay device 3 according to the first embodiment of the wireless communication system of the present invention comprises an electric signal / optical signal converter (E / O) 31 and an optical signal / electric signal converter (O). / E) 32, memory 33 and amplifier (AMP) 34
, A duplexer (DUP) 35 and a distributor 36.

Next, each unit constituting the optical wireless relay device 3 according to the first embodiment of the wireless communication system of the present invention will be described. The memory 33 stores the individual optical wireless relay devices 3
Is a storage unit that stores the identification number of the storage device.

Electric signal / optical signal converter (E / O) 31
Is for converting an electric signal into an optical signal. The electric signal input from the amplifier 34 is added with an identification number stored in the memory 33 to be converted into an optical signal, which is transmitted to the optical cable 5. I have.

Optical signal / electrical signal converter (O / E) 32
Is a device for converting an optical signal into an electric signal.
Is converted into an electric signal and output to the amplifier 34.

The amplifier (AMP) 34 amplifies the electric signal, amplifies the signal input from the duplexer 35, outputs the amplified signal to the electric signal / optical signal converter 31, and inputs the signal from the electric signal / optical signal converter 32. The amplified signal is amplified and output to the duplexer 34.

A duplexer (DUP) 35 is a coupler that can simultaneously transmit and receive a reception signal from the leaky coaxial cable 6 to the base station device 2 and a transmission signal from the base station device 2 to the leaky coaxial cable 6. The distributor 36 distributes the signal to the leaky coaxial cable 6 in two directions.

Next, the operation of the wireless communication system according to the first embodiment of the present invention will be described with reference to FIGS. In the wireless communication system of the present invention, before traveling on a train on which the mobile device 4 is mounted, the mobile device identification number of the train is transmitted via the leaky coaxial cable 6 and the optical wireless relay device 3 to the base station 2 and the central control device 1. And stored in the base station 2 and the central controller 1.

The upstream data from the mobile unit 4 is received by the leaky coaxial cable 6, and the received electric signal is amplified by the amplifier 34 in the optical wireless repeater 3, and the electric signal / optical signal converter 31 After the identification number of the optical wireless relay device 3 stored in the memory 33 is added, the signal is converted into an optical signal and transmitted to the base station device 2 via the optical cable 5.

In the base station device 2, the optical signal received via the optical cable 5 is converted into an electric signal by the optical signal / electric signal converter 23, received by the receiver 21 and transmitted to the central control device 1. .

The central control unit 1 receives the electric signal transmitted from the base station apparatus 2 and detects the change in the identification number of the optical wireless relay apparatus 3 added to the received electric signal (including the mobile station identification number). , And recognizes that the mobile device 4 (train) is moving.
It recognizes whether the (train) is moving in the upward direction or the downward direction, stores it as operation management information, and manages the operation status. When transmitting the downstream data to the mobile station 4, the mobile station 4 transmits the downstream data to the optical wireless relay device 3 that has just received the upstream data, and also transmits the downstream data to the preceding optical wireless relay device 3 in accordance with the recognized traveling direction. The base station device 2 is instructed to transmit downlink data.

For example, in the central control device 1, the identification number of the uplink data received from the communication area of the base station device 2-1 shown in FIG. If the identification number has changed to the repeater 3-1-2, the mobile station 4 recognizes that it is moving from left to right in FIG. Equipment 3-1-2
And the optical wireless relay device 3 according to the traveling direction.
-1-3 to the base station apparatus 2-1 to transmit downlink data.

When the central control device 1 recognizes that the identification number included in the uplink data is the terminal optical wireless relay device 3 connected to an arbitrary base station device 2,
It also instructs the base station device 2 to transmit the downlink data to the optical wireless relay device 3 at the adjacent end of the base station device 2 adjacent in the traveling direction of the mobile device 4.

For example, in the central control unit 1, the optical wireless repeater 3-1- (n-1) is used next to the optical wireless repeater 3-1- (n-1) based on the identification number of the data received from the communication area of the base station 2-1. 3-1-
When the mobile station 4 recognizes that the mobile station 4 is moving from left to right in FIG. 1, it recognizes that the mobile station 4 is moving from left to right in FIG. Since it is the optical wireless relay device 3 at the terminal that is connected, when transmitting downlink data, it instructs the base station device 2-1 to transmit the data to the optical wireless relay device 3-1-n, and in the traveling direction. The optical wireless relay device 3 at the end of the communication area of the base station device 2-2 adjacent to the base station device
-2-1 is also instructed to transmit downlink data to the base station device 2-2.

Here, the control of the optical wireless relay device for transmitting the downlink data has been described as being performed by the central controller 1, but the control of the optical wireless relay device 3 in the service area of each base station device 2 is performed as follows. The central controller performs only control for transmitting downlink data to the optical wireless relay device at the terminal of the adjacent base station device when the optical wireless relay device 3 at the terminal is used. 1 may be performed.

In the base station device 2, the electric signal transmitted from the central control device 1 is converted into an optical signal by the electric signal / optical signal converter 24 and corresponds to the optical wireless relay device 3 specified by the central control device 1. Optical repeater 3 instructed by central controller 1 via optical cable 5 by transmitter 22
Sent to.

In the optical wireless relay device 3, the optical signal transmitted from the base station device 2 is converted into an electric signal by the optical signal / electric signal converter 32, and is amplified by the amplifier 34.
An electric signal is transmitted from the leaky coaxial cable 6 and the mobile station 4
Is to be received by

When a request to establish communication with another mobile unit 4 is transmitted from any mobile unit 4 in a form designating the mobile unit identification number, the central control unit 1 moves the destination according to the operation management information. Recognizes the current position of the train on which the machine 4 is mounted,
For the corresponding base station device 2 and optical wireless relay device 3,
Control is performed to transmit a connection establishment request (calling).

Further, an arbitrary mobile unit 4 is connected to another mobile unit 4.
When a communication establishment request is transmitted in a form that designates a running "before" or "after" train, the central control device 1 transmits the "before and after" train in accordance with the operation management information. "
Alternatively, the mobile station identification number of the mobile station mounted on the train traveling “after” is determined, the current position of the train on which the other mobile station 4 is mounted is recognized, and the corresponding base station apparatus 2 and optical wireless The relay device 3 is controlled to transmit a connection establishment request (calling).

Next, a second example of the configuration inside the base station device 2 and the optical wireless relay device 3 in the wireless communication system of the present invention will be described as a second embodiment with reference to FIG. FIG. 3 is a block diagram showing a second embodiment inside the base station device 2 and the optical wireless relay device 3 in the wireless communication system of the present invention. The base station apparatus 2 according to the second embodiment in the wireless communication system according to the present invention includes a receiver (Rx) 21 similar to the base station apparatus 2 according to the first embodiment.
And a transmitter (Tx) 22 and an optical signal / electrical signal converter (O /
An input / output unit 25 is provided in addition to the E) 23 and the electric / optical signal converter (E / O) 24.

In the input / output unit 25 of the base station device 2, the identification number of each optical wireless relay device 3 is assigned to an input / output terminal connected to the optical wireless relay device 3 via the optical cable 5, and is set. An optical signal of upstream data transmitted from the optical wireless relay device 3 via the optical cable 5 is input from each input / output terminal, and an optical signal / electrical signal converter (O / E) Output to 23. Conversely, according to the identification number of the optical wireless relay device 3 added to the downstream data from the central control device 1, an input / output terminal corresponding to the optical wireless relay device 3 to be output is selected to output an optical signal. Things.

The optical wireless relay device 3 according to the second embodiment in the wireless communication system of the present invention is different from the optical wireless relay device 3 of the first embodiment in that each optical wireless relay device 3
In which the memory 33 storing the identification number is omitted.

Next, the operation of the wireless communication system according to the second embodiment of the present invention will be described focusing on the differences from the first embodiment. The electric signal of the uplink data from the mobile device 4 received through the
The optical signal is converted into an optical signal by 1 and transmitted to the input / output unit 25 of the base station device 2 via the optical cable 5.

In the base station apparatus 2, the identification number of the optical wireless relay apparatus 3 assigned to the input terminal is added in the input / output unit 25, and the optical signal is converted by the optical signal / electrical signal converter 23 into an electric signal. Central control unit 1 received by
Sent to.

The central control device 1 receives the electric signal transmitted from the base station device 2 and recognizes the movement and the moving direction of the mobile device 4 (train) based on the identification number added to the received electric signal. As in the first embodiment, the base station device 2 and the optical wireless relay device 3 that transmit downlink data are controlled.

In the base station device 2, the central control device 1
The electric signal according to the identifier number of the optical wireless relay device 3 to be transmitted, which is included in the downlink data transmitted from the
After the optical signal is converted into an optical signal by the optical signal converter 24, the optical signal of the downstream data is transmitted from the input / output terminal of the input / output unit 25 corresponding to the designated optical wireless relay device 3 via the optical cable 5 to the optical wireless relay device 3. Is sent to The method of controlling connection in response to a connection establishment request in the central control device 1 is the same as in the first embodiment.

According to the wireless communication system of the present invention, a plurality of optical wireless repeaters 3 having a leaky coaxial cable 6 are arranged along a line, and the base station apparatus 2 and the plurality of optical wireless repeaters 3 are connected in parallel. After connection, an identification number is assigned to each optical wireless relay device 3, the identification number of the received optical wireless relay device 3 is added to the uplink data from the portable device 4 and transmitted to the central control device 1. Recognizing the movement and direction of the train based on the change in the identification number added to the upstream data and instructing the base station apparatus to transmit the downstream data to the optical wireless repeater 3, the relay coaxial cable 6 is relayed in multiple stages. Therefore, the signal-to-noise ratio and the intermodulation characteristics can be improved, and the communication area of the base station can be expanded while maintaining the communication quality.

In the present invention, the base station apparatus 2 and each optical wireless relay apparatus 3 are connected by an optical cable, and the base station 2 and each optical wireless relay apparatus 3 perform photoelectric conversion and electro-optical conversion to perform data transmission. The transmission quality can be maintained even when the distance between the base station 2 and the optical wireless relay device 3 is long, and the installation area of the optical wireless relay device 3 connected to one base station device can be expanded. The number of base station devices can be reduced, the cost of the entire system can be reduced, and the economic efficiency can be improved.

According to the wireless communication system according to the first embodiment of the present invention, the identification number of each optical wireless relay device 3 is stored in the memory 33, and the mobile station receives the identification number via the leaky coaxial cable 6. Since the identification number is added to the upstream data from the memory 33 and transmitted to the base station apparatus 2, control using the identification number can be performed with a simple configuration.

According to the wireless communication system according to the second embodiment of the present invention, the identification number of each optical wireless relay device 3 is managed in association with the input / output terminal of the input / output unit 25 of the base station device. Therefore, there is an effect that control using the identification number can be performed only in the base station apparatus.

According to the radio communication system of the present invention, the central control unit 1 recognizes the traveling direction of the mobile unit 4 from the change of the identification number added to the signal transmitted from the base station device 2 and Is transmitted to the optical wireless relay device 3 that has just received the uplink data and also transmits the downlink data to the preceding optical wireless relay device 3 according to the recognized traveling direction. Since the device 2 is instructed, even if the communication areas (zones) of the optical wireless relay devices 3 do not overlap with each other,
There is an effect that communication quality can be secured without occurrence of communication disconnection.

Further, according to the wireless communication system of the present invention, the optical wireless relay device 3 connected to each base station device 2 can identify the terminal optical wireless relay device 3 as the terminal. When the central controller 1 recognizes that the identification number included in the uplink data is the terminal optical wireless relay device 3 connected to the arbitrary base station device 2 by assigning the number, Since the base station apparatus 2 is also instructed to transmit downlink data to the optical wireless relay apparatus 3 adjacent to the base station apparatus 2 adjacent in the traveling direction, even if the base station apparatus 2 talks, Even if the areas (zones) do not overlap with each other, there is an effect that the time required for handoff can be shortened and the communication interruption time can be eliminated.

According to the wireless communication system of the present invention, a signal is received from the mobile unit 4 via the leaky coaxial cable 6 and transmitted to the base station device 2 by the optical wireless relay device 3.
In the central control device 1, the optical wireless relay device 3
To the base station apparatus 2 to transmit downlink data to the base station apparatus 2, and the base station apparatus 2
Is transmitted to the mobile device 4 via the leaky coaxial cable 6, so that any mobile device (train) and any other mobile device (train)
There is an effect that communication between them can be performed.

Further, according to the radio communication system of the present invention, the central control unit 1 adds the mobile station 4 mounted on the train to a unique number (train number) for each train, the number of which the operation time is converted into data. Recognition by the mobile station identification number, the traveling position and traveling direction of the train, and the overall operation status are recognized from the mobile station identification number included in the uplink data from the mobile station 4 and the identification number of the optical wireless relay device 3. Since the management is performed, there is an effect that communication between the mobile units 4, that is, between trains, can be realized in response to a communication establishment request that specifies a mobile unit identification number from the mobile unit 4 and is issued based on recognition according to the work of the crew. .

Further, in response to a communication establishment request designating a train traveling “before” or “after” from an arbitrary mobile device 4, the central control device 1 performs the following operations according to the operation management information of each train.
Mobile device 4 mounted on a train traveling “before” or “after”
Communication between trains is realized by determining the mobile station identification number of the train, so in an emergency, etc., even if you do not know the mobile station identification number, communication with the crew of the train traveling "before" or "after" Has the effect that it can be quickly established.

[0068]

According to the present invention, a central controller for controlling communication in a system, at least one base station connected to the central controller, and a straight line connected in parallel to each base station by an optical cable. A wireless communication system having at least one optical wireless relay device that wirelessly communicates with a mobile device that moves linearly in one direction, wherein each optical wireless relay device is assigned a unique identifier. And
Uplink data transmitted via each optical wireless relay device includes:
The central control device recognizes the traveling direction of the mobile station with the identifier included in the uplink data from the base station and transmits the downlink data in accordance with the recognized traveling direction. Since the central control device instructs the station device, it is possible to expand the communication area of the base station device while maintaining the communication quality, and to prevent the occurrence of communication interruption time due to the switching of the optical wireless relay device in the area. There is an effect that can be done.

According to the present invention, the central control unit recognizes the traveling direction of the mobile station based on the identifier included in the uplink data from the base station, and connects the optical wireless relay device with the identifier included in the uplink data to the connected mobile station. If it is the terminal optical wireless relay device in the base station device, the base station device is instructed to transmit downlink data also to the optical wireless relay device of the adjacent base station device in the traveling direction of the mobile device. Since the wireless communication system is the central control device, the base station device can be smoothly switched (handed off) even when moving between communication areas, and there is an effect that communication interruption time can be prevented. .

According to the present invention, the central control unit recognizes the position and traveling direction of a traveling mobile device by using a mobile device identification number obtained by adding a number obtained by digitizing the operation time to a mobile device unique number. When the traveling status of a mobile device is grasped and a communication establishment request from any mobile device to another mobile device is specified in a form that is in accordance with the traveling condition, the connection destination is determined according to the grasped traveling condition. Since the wireless communication system is a central control unit that specifies the mobile unit identification number of the mobile unit and performs control to establish communication, it is easy and easy to understand by specifying the communication establishment request destination in a form that matches the driving situation. There is an effect that a reliable one-to-one communication can be realized by an easy operation, and the usability can be improved.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a first embodiment inside a base station device and an optical wireless relay device in the wireless communication system of the present invention.

FIG. 3 is a block diagram showing a second embodiment inside a base station device and an optical wireless relay device in the wireless communication system of the present invention.

FIG. 4 is a schematic block diagram of a conventional wireless communication system.

[Explanation of symbols]

1, 1 '... central control device, 2, 2' ... base station device,
3 ... optical wireless repeater (REP) 4 ... mobile station 5 ...
Optical cable 6 Leaky coaxial cable (LCX cable) 7 Repeater 8 Duplexer (D)
21: Receiver (Rx), 22: Transmitter (Tx),
23: optical signal / electric signal converter (O / E), 24: electric signal / optical signal converter (E / O), 31: electric signal /
Optical signal converter (E / O), 32: Optical signal / electrical signal converter (O / E), 33: Memory, 34: Amplifier (AM)
P), 35: Duplexer (DUP), 36: Distributor

Claims (3)

[Claims] 1. A central control device for controlling communication in a system, at least one base station device connected to the central control device, and linearly connected to each of the base station devices in parallel with an optical cable. A wireless communication system having at least one optical wireless relay device that performs wireless communication with a mobile device that moves linearly in one direction, wherein each optical wireless relay device is assigned a unique identifier, The uplink data transmitted via each of the optical wireless relay devices is transmitted with the identifier added thereto, and the central control device uses the identifier included in the uplink data from the base station to transmit the mobile device in the traveling direction. And a central control unit that instructs the base station apparatus to transmit an optical wireless relay apparatus that transmits downlink data in accordance with the recognized moving direction to the base station apparatus. 2. A central control unit recognizes a traveling direction of the mobile station based on an identifier included in uplink data from a base station,
Optical wireless relay device of the identifier included in the uplink data,
When the terminal is the terminal optical wireless relay device in the connected base station device, the base station transmits downlink data to the optical wireless relay device of the adjacent base station device in the traveling direction of the mobile device. The wireless communication system according to claim 1, wherein the wireless communication system is a central control device that instructs the device. 3. A central control unit recognizes a position and a traveling direction of a traveling mobile device by a mobile device identification number obtained by adding a number obtained by digitizing an operation time to a unique number of the mobile device,
Understand the traveling conditions of a plurality of mobile devices, and when a communication establishment request from any mobile device to another mobile device is specified in a form that is in accordance with the traveling conditions, according to the grasped traveling conditions, The wireless communication system according to claim 1 or 2, wherein the wireless communication system is a central control device that specifies a mobile device identification number of a mobile device to be connected and performs control for establishing communication.