JP2010167822A - Ground wireless installation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground wireless installation capable of performing radiocommunication between an on-vehicle wireless installation mounted on a stopping train and itself, by controlling a directional antenna based on train information provided from a signal facility. <P>SOLUTION: The direction of antennas 11a and 11b is adjusted at a predetermined angle in advance, and the antenna connected to a transmission-reception part 13 is switched by a switch 14. Switching of the switch 14 is performed based on a switching control signal from a radio wave radiation control part 12. The transmission-reception part 13 is connected to an external communication device 15, and processing such as modulation and amplification of a transmitting-received signal is performed by the transmission-reception part 13. A ground signal facility 16 receives a train existing line detecting signal of indicating that a train 6 exists on a line 1 and a vehicle identification signal received by radio transmission by a wayside coil 17 from the train 6, and relays the signals to the radio wave radiation control part 12 of the ground wireless installation 3. The radio wave radiation control part 12 generates a control signal based on the train existing line detecting signal and the vehicle identification signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a terrestrial wireless device that performs wireless communication with an in-vehicle wireless device mounted on a train.

  In recent train radio, various technologies such as LCX and wireless LAN are widely used and used for services such as data transmission and telephone. Furthermore, recently, services for distributing moving image content such as commercials to passengers in vehicles have been started, and a broadband wireless line is also required for train radio. However, the conventional train radio system has a small wireless line capacity and cannot transmit large-capacity wireless transmissions such as video content. Therefore, it has a high frequency such as millimeter waves and a high transmission rate in a short period of time. Information is transmitted efficiently. However, since the millimeter wave has a high frequency of several tens of GHz and a strong directivity of radio waves, it is necessary to use the antenna of the ground radio and the antenna mounted on the train with high accuracy. As a means for controlling antenna directivity, Patent Document 1 uses GPS to detect a train position, but is not suitable for highly accurate antenna control in millimeter wave band wireless communication. In addition, since GPS radio waves do not reach the subway, control based on information obtained from railway signal equipment is required.

JP 2004-168216 A

  In order to transmit large-capacity data such as video content in a short time between the in-vehicle wireless device and the terrestrial wireless device when the train is stopped in the station, it is possible to secure a high frequency and a wide band. Although it is necessary to use radio waves in the millimeter wave band or the like, radio waves having a high frequency are highly directional and require that the antenna of the in-vehicle radio apparatus and the antenna of the terrestrial radio apparatus be opposed to each other. Therefore, it is conceivable to install the same number of ground radio devices that communicate with the in-vehicle wireless devices mounted on the trains that are stopped at the station as the number of stop positions according to the stop position of the train. There is a problem that the number of equipment increases and the equipment cost and the construction cost increase. Also, especially in subway stations and other stations, the number of installation locations is small, and other signal facilities are often installed, so it is possible to secure a place for installing multiple terrestrial radio devices in the same station. There was a problem that it became more difficult.

  The present invention has been made to solve the above-described problems, and controls a directional antenna based on train information obtained from signal equipment, with an in-vehicle wireless device mounted on a stopped train. An object of the present invention is to obtain a terrestrial radio apparatus that can perform radio communication between them.

  The ground radio apparatus according to the first aspect of the present invention is an antenna unit installed on the ground and having a variable beam directing direction, a transmission / reception unit for processing a signal transmitted / received by the antenna unit, and a presence detection signal generated by an incoming train. And a radio wave radiation control unit for transmitting a control signal to the antenna unit so that the beam directing direction is directed to the direction of the in-vehicle wireless device mounted on the train based on the vehicle identification signal.

  A ground radio apparatus according to a second aspect of the present invention is the ground radio apparatus according to the first aspect of the present invention, wherein the antenna section is directed toward a vehicle-mounted radio apparatus mounted on a train that stops on the first track. The first antenna, the second antenna directed to the in-vehicle wireless device mounted on the train that stops on the second track, the first antenna and the second antenna are switched to the transmission / reception unit. It has a switching means for connection.

  The terrestrial radio apparatus according to the invention of claim 3 is the terrestrial radio apparatus according to the invention of claim 2, wherein the radio wave radiation control unit is configured such that the train is stopped on the first track and the second track. In addition, a control signal for changing the beam directing direction in a time division manner is sent to the antenna unit.

  According to a fourth aspect of the present invention, there is provided a terrestrial radio apparatus according to the first aspect of the present invention, wherein the antenna section is directed toward a vehicle-mounted radio apparatus mounted on a train that stops at the first stop position. The first antenna, the second antenna directed toward the in-vehicle wireless device mounted on the train that stops at the second stop position, and the transmission / reception by switching between the first antenna and the second antenna. Switching means connected to the unit.

The ground radio apparatus according to the invention of claim 5 is the ground radio apparatus according to the invention of claim 1,
The antenna section has beam changing means for changing the beam directing direction mechanically or electrically.

The terrestrial radio apparatus according to the invention of claim 6 is the terrestrial radio apparatus according to the invention of claim 5,
The radio wave emission control unit is an information table in which the direction of the in-vehicle wireless device mounted on the train stopping on the first track and the direction of the in-vehicle wireless device mounted on the train stopping on the second track are described. When the train is stopped on the first track and the second track, a control signal for changing the beam directing direction in a time division manner is sent to the beam changing means. .

  The terrestrial radio apparatus according to the invention of claim 7 is the terrestrial radio apparatus according to the invention of claim 5, wherein the radio wave radiation control unit is mounted on a train at a plurality of stop positions of the train to be stopped and at each stop position. It has an information table in which the direction of the wireless device is described, and sends a control signal for changing the beam directing direction to the beam changing means.

  According to the present invention, by controlling the directional antenna based on the train information obtained from the signal equipment, wireless communication can be performed between the ground wireless device and the in-vehicle wireless device mounted on the stopped train. I can do it.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the whole structure of the train radio | wireless system containing the ground radio | wireless apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which comprises the terrestrial radio | wireless apparatus and peripheral device which concern on Embodiment 1 of this invention. It is a block diagram showing the example of mounting of the electromagnetic wave radiation control part in the terrestrial radio | wireless apparatus which concerns on Embodiment 1 of this invention. It is a timing chart figure showing the signal timing in the ground radio equipment concerning Embodiment 1 of this invention. It is a functional block diagram showing the structure of the ground radio apparatus which concerns on Embodiment 2 of this invention. It is an information table of the antenna directivity direction of the ground radio apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of the train radio system containing the ground radio | wireless apparatus which concerns on Embodiment 3 of this invention.

  Embodiment 1

  A terrestrial radio apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a configuration diagram showing the overall configuration of a train radio system including a ground radio apparatus according to Embodiment 1 of the present invention. In the first embodiment, in communication between the in-vehicle wireless device 9 mounted on the train stopped at the station and the ground wireless device 3 installed on the ground, the directivity of the antenna attached to one ground wireless device 9 is set. By controlling, it communicates with the vehicle-mounted radio | wireless apparatus 9 mounted in the train which stops on a different number line by a time division. The beam directing direction 4 of the antenna of the ground radio apparatus 3 is installed and adjusted so as to face the antenna of the in-vehicle radio apparatus mounted on each stopped train. The system configuration shown in FIG. 1 includes an in-vehicle wireless device 9 and an in-vehicle wireless device 10 mounted on each of a train 6 stopped on the track 1 (line 1) and a train 7 stopped on the track 2 (line 2), It is composed of a wireless device 3 (including an antenna). The antenna of the terrestrial wireless device 3 switches the directivity of the transmission radio wave 4 between the in-vehicle wireless device 9 and the in-vehicle wireless device 10 in a time division manner, and performs communication with each in-vehicle wireless device. The terrestrial wireless device 3 radiates radio waves in a time-sharing manner with the same frequency toward the train 6 and the train 7, and does not perform simultaneous communication with a plurality of in-vehicle wireless devices. This is because the functions of the modem and the like are simplified by making the reception frequency of the in-vehicle wireless device the same, and the circuit scale of the in-vehicle wireless device is not increased.

  FIG. 2 is a block diagram showing the terrestrial radio apparatus and peripheral devices according to Embodiment 1 of the present invention. The terrestrial radio apparatus 3 shown in FIG. 2 includes a radio wave radiation control unit 12 that controls the radio wave radiation directions of the antennas 11a and 11b, and a transmission / reception unit 13 that inputs and outputs information with the antennas 11a and 11b. The antenna unit of the terrestrial radio apparatus 3 includes a plurality of antennas (two antennas 11a and 11b are shown in FIG. 2 but may be three or more antennas) and a switch 14. The direction of each antenna is set at a predetermined angle in advance. The direction in which the radio wave is radiated is switched by switching the antenna connected to the transmission / reception unit 13 by the switch 14. Switching by the switch 14 is performed based on a switching control signal from the radio wave radiation control unit 12. Each device constituting the terrestrial wireless device 3 may be housed in one housing, or may be installed in an independent place as another device. The transmission / reception unit 13 is connected to the external communication device 15, and the transmission / reception unit 13 performs processing such as modulation / demodulation and amplification of transmission / reception signals. A transmission / reception signal input / output between the transmission / reception unit 13 and the external communication device 15 may be a digital signal under a network connection environment or an analog signal such as NTSC. The ground signal facility 16 receives an on-line detection signal indicating that the train 6 (or 7) exists on the track 1 (or 2) and a vehicle identification signal received by the ground unit 17 from the train 6 (or 7) by radio. This is a device that relays to the radio wave radiation control unit 12 of the ground radio device 3.

  Next, operations of the terrestrial radio apparatus and peripheral devices will be described. First, before the operation is started, the beam direction of the antenna 11a is adjusted to face the antenna of the in-vehicle wireless device 9 mounted on the train 6 that enters the line 1, and the beam direction of the antenna 11b is adjusted to the train 7 that enters the line 2. It adjusts so that it may face the antenna of the vehicle-mounted radio | wireless apparatus 10 mounted. Here, it is assumed that the stop positions 8 of the train 6 and the train 7 are determined, and under the condition that the position of the in-vehicle wireless device 9 in the train 6 and the position of the in-vehicle wireless device 10 in the train 7 are known. Assuming that the directions of the antennas of the in-vehicle wireless device 9 and the in-vehicle wireless device 10 viewed from the antennas 11a and 11b of the wireless device 3 are required, the beam directions of the antennas of the in-vehicle wireless device 9 and the in-vehicle wireless device 10 are adjusted. The After the antenna adjustment before the operation, a state where the train is not stopped on either the track 1 or the track 2 is considered as an initial state. In this state, no on-line detection signal is generated from either line. The radio wave emission control unit 12 switches a control signal (disconnection signal) for disconnecting communication between the antennas 11 a and 11 b and the transmission / reception unit 13 in a state where no standing line detection signal is input via the ground signal facility 16. 14 to send.

  As a next state, a state where the train 6 enters the track 1 and stops at the stop position 8 is considered. In this state, an on-line detection signal is generated on the track 1, a vehicle identification signal of the train 6 is generated by the ground element 17, and these signals are input to the ground signal facility 16. When the presence line detection signal and the vehicle identification signal are input from the ground signal facility 16 to the radio wave emission control unit 12, the radio wave emission control unit 12 is notified that the train 6 has stopped at the stop position 8. The radio wave emission control unit 12 sends a control signal (selection signal) to the switch 14 so that the antenna 11a and the transmission / reception unit 13 are connected. The switch 14 connects the antenna 11a and the transmission / reception unit 13 based on this control signal. Switch the connection so that

  As a next state, a state in which the train 6 enters the track 2 and stops at the stop position 8 while the train 6 is stopped on the track 1 is considered. In this state, an on-line detection signal is generated on the track 2, a vehicle identification signal of the train 7 is generated by the ground element 17, and these signals are input to the ground signal facility 16. When the presence line detection signal and the vehicle identification signal are input from the ground signal facility 16 to the radio wave radiation control unit 12, the radio wave radiation control unit 12 is notified that the train 7 has stopped at the stop position 8. At this time, the radio wave radiation control unit 12 sequentially sends a control signal (selection signal) to the switch 14 so that the antenna 11a and the antenna 11b are connected to the transmission / reception unit 13 in a time division manner. The antenna 11a and the antenna 11b connected to the transmission / reception unit 13 are switched based on the control signal from.

  Details of the configuration and function of the radio wave radiation control unit 12 will be described. The input to the radio wave emission control unit 12 is a standing line detection signal and a vehicle identification signal from the ground signal equipment 16 and a communication stop signal from the external communication device 15. The output from the radio wave emission control unit 12 is sent to the switch 14. The control signal is a frame timing signal to the transmission / reception unit 13, and the radio wave emission control unit 12 can be configured using a logic circuit. For example, an implementation example using a programmable logic device (PLD) is shown in FIG. . In FIG. 3, the radio wave radiation control unit 12 has one PLD mounting board 18, and the PLD mounting board 18 has a presence detection signal (line 1), a vehicle identification signal (line 1), a presence detection signal (line 2), A vehicle identification signal (track 2), a communication stop signal (track 1), and a communication stop signal (track 2) are input. The PLD mounting substrate 18 generates an output from each signal.

  FIG. 4 is a timing chart showing signal timing in the terrestrial radio apparatus according to Embodiment 1 of the present invention. FIG. 4A is a timing chart in a state where the train is stopped only on the first line. After the presence line detection signal (track 1) rises, the vehicle identification signal (track 1) occurs, and the antenna 11a is selected. Is output from the radio wave radiation control unit 12. The frame timing signal remains 0, which indicates that the antenna 11a is selected. Communication is started with the transmission from the in-vehicle wireless device mounted on the train 6, and information data and the like are also transmitted from the ground wireless device 3.

  FIG. 4B is a timing chart in a state in which the train 7 enters the second line and stops while the train 6 stops on the first line. After the standing line detection signal (line 2) rises, the vehicle identification signal (line 2) is generated, and then the control signals for selecting the antenna 11a and the antenna 11b are alternately output from the radio wave radiation control unit 12. At this time, the frame timing signal outputs 0 value and 1 value according to the control signal. The transmission / reception unit 13 of the terrestrial wireless device 3 starts transmission to the train 7 triggered by transmission from the in-vehicle wireless device mounted on the train 7. At this time, when the timing signal is 0 value, the train 6 When the timing signal is 1 value, the transmission signal to the train 7 is output to the antenna side. A preset value is used for the time interval T of the antenna switching control signal output from the PLD mounting substrate 18, but the setting may be changed from the transmission / reception unit 13 or the external communication device 15.

  In operation, even if the train is stopped on both the track 1 and the track 2, there is a case where communication is unnecessary for one train. For example, it is conceivable that a train that performs a loopback operation at a station that is not the terminal station has stopped at the same position for a long time and has completed communication. In such a case, switching the antenna at the time interval T is inefficient. For this reason, as shown in FIG. 3, a signal line for inputting a transmission stop signal (line 1) and a transmission stop signal (line 2) is provided in the radio wave radiation control unit 12 to the line side where the transmission stop signal is generated. Do not output the antenna switching control signal. Actually, a signal indicating that the communication is completed is transmitted from the in-vehicle wireless device 9 mounted on the train 6 or the in-vehicle wireless device 10 mounted on the train 7 to the terrestrial wireless device 3, and is transmitted to the transmitting / receiving unit 13. The lever signal may be detected and a transmission stop signal (line 1) or a transmission stop signal (line 2) may be output to the radio wave radiation control unit 12.

  As described above, according to the terrestrial radio apparatus 3 according to the first embodiment, the antenna directivity is controlled by switching the plurality of antennas in the terrestrial radio apparatus 3, and the plurality of trains entering the station are controlled. Time-division communication with an on-vehicle wireless device installed is possible. Controlling the antenna directivity in this way is particularly suitable for wireless communication in the millimeter wave band with high beam directivity, and high-capacity communication can be performed at high speed. In addition, since the transmission signal from the terrestrial wireless device 3 is transmitted to a plurality of in-vehicle wireless devices in a time-sharing manner, the communication method (frequency, bandwidth, modulation type, etc.) can be made common. The reception processing system of the in-vehicle wireless device mounted on the train is also shared and can be configured with one system so that the circuit scale does not need to be increased.

  Embodiment 2

  A terrestrial radio apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 5 is a functional block diagram showing the configuration of the terrestrial radio apparatus according to Embodiment 2 of the present invention. In FIG. 5, reference numeral 19 denotes an antenna whose direction can be changed mechanically or electrically. For example, an antenna having a mechanical drive that mechanically changes the antenna angle, or a plurality of antenna elements. A phased array type antenna that configures an antenna aperture to change the phase of each element includes a phase control device. In FIG. 5, parts or circuits denoted by the same reference numerals as those in FIG. 2 are specifically described in the second embodiment, and are the same as or correspond to the parts or circuits in FIG. The radio wave emission control unit 12 can be configured in the same manner as that shown in FIG. 3, but it is assumed that a recording area for recording information as shown in FIG. FIG. 6 is an information table of antenna directivity directions, in which information including line numbers and angles that define the corresponding antenna directivity directions is described. The radio wave emission control unit 12 extracts the antenna directivity direction angle corresponding to the number of the track on which the train to be communicated is stopped based on the presence line detection signal and the vehicle identification signal from the ground signal facility 16 and outputs the angle to the antenna 19. Command. This angle command replaces the control signal shown in FIG. 4, and the antenna 19 changes the antenna angle based on this command. In addition, when communicating with a plurality of trains in a time-sharing manner, the radio wave radiation control unit 12 sequentially transmits antennas corresponding to the line numbers on which the trains to be communicated exist as control signals in FIG. An angle command based on the pointing direction may be generated and sent to the antenna 19.

  As described above, the terrestrial radio apparatus 3 according to the second embodiment can perform communication by directing the antenna to the in-vehicle radio apparatus in a time division manner.

  Embodiment 3

  A terrestrial radio apparatus according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 7 is a configuration diagram showing a configuration of a train radio system including a terrestrial radio apparatus according to Embodiment 3 of the present invention. As shown in FIG. 7, there are a plurality of stop positions such as a stop position 20 and a stop position 21 on the track 1, for example, a 10-car train at the stop position 20 and 8 at the stop position 21. Consider the case where both trains stop. The terrestrial radio apparatus 3 shown in FIG. 6 changes the antenna directivity of the terrestrial radio apparatus 3 installed in the home 5 to change the in-vehicle radio mounted on the train 6 that stops at either the stop position 20 or the stop position 21. Communication is performed with the device 9. The configuration of the terrestrial wireless device 3 only needs to have the configuration of FIG. 2 or FIG. However, the train does not stop at the stop position 20 and the stop position 21 at the same time, and the terrestrial wireless device 3 includes an in-vehicle wireless device mounted on the train 6 that stops at either the stop position 20 or the stop position 21, Time-division communication is performed with the in-vehicle wireless device mounted on the train 7 that stops on the track 2 that does not.

  According to the configuration of the terrestrial radio apparatus 3 shown in FIG. 2, the terrestrial radio apparatus 3 according to the present embodiment has two antennas whose beam directions are adjusted corresponding to the stop position 20 and the stop position 21 of the track 1. And an antenna whose beam direction is adjusted in the direction of the in-vehicle wireless device mounted on the train 7 that stops on the track 2 (not shown). Further, according to the configuration of the terrestrial radio apparatus 3 shown in FIG. 5, the terrestrial radio apparatus 3 according to the present embodiment has a direction in which the antenna is directed corresponding to the stop position 20 and the stop position 21 of the track 1, 6 includes an information table according to the information table shown in FIG. 6 in which the direction of the antenna of the in-vehicle wireless device mounted on the train stopped on the track 2 is described, and one of the antennas selected with respect to the track 1 from the information table The direction and the antenna direction with respect to the line 2 are extracted, and the antenna directing direction is changed in a time division manner. In addition, in any case where a train that stops at the stop position 20 or a train that stops at the stop position 21 enters the track 1, even if it is in the ground signal facility that generates the same presence detection signal from the track 1, it is acquired when the train stops. Since the vehicle composition of the train that has entered the line is determined by the vehicle identification signal from the ground unit 17 that has been entered (it is sufficient that the radio wave radiation control unit 12 has a vehicle identification signal and an information table of the vehicle composition). The actual stop position can be specified based on the vehicle composition.

  As described above, according to the third embodiment, a plurality of antennas of the terrestrial radio apparatus 3 are provided even when a train having a different vehicle composition enters the track and there are a plurality of stop positions on the same track. Alternatively, by providing an information table corresponding to the stopping positions in the radio wave radiation control unit 12, the directivity of the antenna of the terrestrial radio apparatus 3 can be time-divisionally directed to a plurality of in-vehicle radio apparatuses. It is possible to change the communication between the terrestrial wireless device and the in-vehicle wireless device.

DESCRIPTION OF SYMBOLS 3 Terrestrial radio equipment 4 Beam directing direction 6, 7 Train 9, 10 Car-mounted radio equipment 11a, 11b Antenna 12 Radio wave emission control part 13 Transmission / reception part 14 Switch 19 Antenna 20, 21 Stop position

Claims (7)

Based on an antenna unit that is installed on the ground and the beam directing direction is variable, a transmission / reception unit that processes signals transmitted / received by the antenna unit, and a presence detection signal and a vehicle identification signal generated by the arrival of a train, A terrestrial radio apparatus comprising: a radio wave radiation control unit that transmits a control signal to the antenna unit so that the radio signal is directed toward a vehicle-mounted radio apparatus mounted on the train. The antenna unit is directed to the direction of the in-vehicle wireless device mounted on the train stopped on the first track and the direction of the in-vehicle wireless device mounted on the train stopped on the second track. 2. The terrestrial radio apparatus according to claim 1, further comprising a switching unit configured to switch the second antenna, the first antenna, and the second antenna to be connected to the transmission / reception unit. The radio wave radiation control unit sends a control signal for changing a beam directing direction to the antenna unit in a time division manner when a train is stopped on the first track and the second track. The terrestrial radio apparatus according to claim 2. The antenna unit includes a first antenna directed toward a vehicle-mounted wireless device mounted on a train that stops at the first stop position, and a direction of the vehicle-mounted wireless device mounted on a train stopped at the second stop position. 2. The terrestrial radio apparatus according to claim 1, further comprising: a second antenna directed to the first antenna, and a switching unit that switches between the first antenna and the second antenna and connects to the transmission / reception unit. 2. The terrestrial radio apparatus according to claim 1, wherein the antenna unit includes a beam changing unit that changes a beam directing direction mechanically or electrically. The radio wave emission control unit is an information table in which the direction of the in-vehicle wireless device mounted on the train stopping on the first track and the direction of the in-vehicle wireless device mounted on the train stopping on the second track are described. And when the train is stopped on the first track and the second track, a control signal for changing the beam directing direction in a time division manner is sent to the beam changing means. The terrestrial radio apparatus according to claim 5. The radio wave radiation control unit has an information table in which a plurality of stop positions of a train to be stopped and directions of in-vehicle wireless devices mounted on the train at each stop position are described. 6. The terrestrial radio apparatus according to claim 5, wherein a control signal for changing a direction is transmitted.

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