JPH10285095A - Relay amplifier device for tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption needed for operation of a relay amplifier device by operating intermittently the amplifier device placed in a railway tunnel only at the passing times of trains and to perform the relay service. SOLUTION: This device consists of a radio base station 1, a radio relay amplifier device (master station) 2, a transmission cable 4 which transmits the incoming/outgoing circuit signals to an antenna that transmits the signals to a slave station 6 or a mobile unit from the station 2, an amplifier device (slave station) 6 having an antenna which transmits the signals to a mobile station, and a mobile unit 5 such as a portable unit, etc., that is used in a blind sector. A sensor 8 is placed at a position near the entrance/exist of a railway tunnel to monitor a train 7 entering and leaving a blind sector, i.e., a tunnel. In such a constitution, a user is restricted to receive the relay service only at the time when the train 7 is running in the tunnel. Therefore, a relay operation is started after the train 7 entered the tunnel is detected, the relay service is kept while the train 7 is running in the tunnel, and the relay operation is stopped after the train 7 has passed through the tunnel. As a result, the satisfactory service is secured with the least and necessary power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay amplifying apparatus in, for example, cellular mobile communication, and more particularly to a relay amplifying apparatus for a tunnel.

[0002]

2. Description of the Related Art In a cellular mobile communication system in which a base station is provided in each of a plurality of service areas and communication is performed with a mobile station in the service area, a dead zone where radio waves do not reach from the base station in the service area. If there is, a remedy is needed. In particular, when a mobile station exists in a tunnel, a direct radio wave does not normally arrive from the base station, and therefore, some type of relay device is required.

Conventionally, when a mobile communication service is provided in such a tunnel, a method of installing a relay amplifier as shown in FIG. In the figure, 1 is a wireless base station of the system, 2 is a relay amplifying device (relay device) provided for relaying radio waves from the base station 1 to mobile stations in the tunnel, and 3 is disposed in the tunnel. Relay antenna.

In some cases, the relay amplification device 2 is used as a master station, and a slave station having the relay antenna 3 and an amplification function is provided. Also,
Reference numeral 4 denotes a transmission cable for connecting the relay amplification device 2 to a slave station or a relay antenna 3 inside the tunnel and transmitting a signal, and is realized by an optical fiber cable, a coaxial cable, a leaky coaxial cable, or the like. Reference numeral 5 denotes a mobile device in the tunnel. Radio waves are transmitted and received between the base station 1 and the relay amplifier 2.

A radio wave from the base station 1 received by the relay amplifier 2 (master station) is amplified, radiated into the tunnel by the relay slave station or the relay antenna 3 via the transmission cable 4, and moved. It reaches the station 5 (downlink signal). vice versa,
The uplink signal is also relayed along the same route from the mobile station 5 to the base station 1, and the uplink and downlink lines are connected.
In this case, the relay amplifier 2 does not recognize whether the mobile station 5 exists in the tunnel.
Is radiated at a certain level in the tunnel, and is relayed regardless of the presence or absence of the mobile station 5.

When the tunnel is a railway tunnel, the mobile device is generally a portable device used by passengers on a railway. Even in such a case, the above-described relay system is an effective means.

[0007]

However, in the case of a railway tunnel, unlike a case where a mobile device such as a portable device may always be present, such as a tunnel of an expressway or an underground shopping mall, the time during which communication is performed is different. Is limited to a certain time. That is, it is limited to the time when the train is passing. But,
In reality, since there is no information indicating whether or not a mobile station is present in the tunnel, the relay operation is continued as it is, which is uneconomic in terms of power consumed by the relay amplifying device, and goes against energy saving. There is a problem of doing.

[0008] An object of the present invention is to provide a relay amplifying apparatus which is installed in a railway tunnel and which has low power consumption in accordance with the passing time of a train.

[0009]

A relay amplifying apparatus for a tunnel according to the present invention is provided near a train passing tunnel and transmits and receives radio waves to and from a base station. And a plurality of slave stations that transmit and receive radio waves and a mobile station mounted on a train passing through the tunnel that is connected to the tunnel by a transmission cable and a plurality of slave stations that transmit and receive radio waves. While in, the sensors for detecting the presence of the train are installed near the entrance and the exit of the tunnel, and the relay amplifying device master station detects that the train has entered the tunnel by the train detection signal of the sensor. At this time, the power supply of both the upstream and downstream amplifiers of the relay amplification apparatus master station is turned on to start the relay operation, and a power control signal is output to the plurality of slave stations.
When the train leaves the tunnel, the power supply of both the upstream and downstream amplifiers of the relay amplification apparatus master station is turned off to stop the relay operation and output a power control signal to the plurality of slave stations. Each of the plurality of slave stations is configured to turn on / off the power of both the upstream and downstream amplifiers of the slave station in accordance with a power control signal from the master relay amplifier apparatus. Things.

[0010]

FIG. 1 is an explanatory diagram showing an outline of an embodiment of the present invention. In the figure, 1 is a radio base station, 2 is a radio relay amplifying device (master station), 4 is a transmission cable for transmitting uplink / downlink signals from the master station to an antenna for a slave station or a mobile station, and 6 is a slave cable. It is a station and an amplifying device with an antenna for mobile stations. Reference numeral 5 denotes a mobile device such as a portable device in a blind spot. Reference numeral 7 denotes a train such as a railway, and reference numeral 8 denotes a sensor for monitoring entry and exit of the train 7 into and out of a blind area, that is, a tunnel.

The present invention focuses on the fact that the user uses the relay service only when the train 7 passes through the tunnel, detects that the train 7 has entered the tunnel, and starts the relay operation. I do. While the train 7 is in the tunnel, the relay service is continued, and after passing, the relay operation is stopped. As a result, a sufficient service can be provided with the minimum necessary power consumption.

A specific example will be described with reference to FIG. FIG.
FIG. 3 is a detailed block diagram of an embodiment of the present invention. This embodiment is an example of a relay amplifying device for tunnel using an optical conversion system. In the figure, reference numeral 2 denotes a downlink radio wave 1 from the base station 1.
1 is a relay amplifier (master station) provided with an antenna 12 for transmitting uplink radio waves to a base station. 6
Are a plurality of slave stations arranged in the tunnel, each of which is connected to the master station 2 via optical cables 17 and 24,
An antenna 21 is provided for transmitting and receiving data to and from the antenna. 8 is a sensor for detecting a train, 13 is a duplexer, 14, 20, and 2
2, 26 are amplifiers and 15, 23 are electro-optical converters (E /
O), 16 is an optical distributor, 19 and 25 are optical-electrical converters (O / E), 27 and 29 are control units (CONT), 28 and
Reference numeral 30 denotes a power supply unit (PS), and 31 denotes a photosynthesizer.

Downlink radio waves 11 arriving from the base station 1 are input to the base station duplexer 13 from the base station antenna 12. The downstream radio wave is amplified by the downstream preamplifier 14 and converted into an optical signal by an electric-optical converter (E / O) 15. The converted optical signals are distributed to the number of slave stations by the optical distributor 16 and transmitted to the slave stations 6 via the optical fibers 17 respectively. The optical signal received by the slave station 6 is replaced with an electrical signal by the optical / electrical converter 19 in the slave station 6 and power-amplified by the downstream slave station amplifier 20 to a level required for radiation to the service zone. The light is radiated from the transmission antenna 21 toward the mobile device 5.

Similarly, the upstream signal from the mobile station 5 to the slave station upstream amplifier 22, the electric / optical converter 23 (up),
The light is radiated toward the base station 1 by the duplexer 13 for the base station and the antenna 12 for the base station via the optical fiber (up) 24, the optical combiner 31, the optical / electrical converter 25, and the base station upstream amplifier 26.

The sensors 8 are installed near the entrance and the exit of the tunnel, detect that a train has entered the tunnel, input a detection signal to the control unit 27, and send an amplifier ON signal from the control unit 27 to the power supply unit 28. Is sent. The power supply unit 28 starts the relay operation by turning on the power supply to the down / up amplifiers 14 and 26. The sensor 8 installed at the exit of the tunnel detects that the train has left the tunnel and notifies the control unit 27 of the detection. The control unit 27 sends an OFF signal to the power supply unit 28 to output the down / up amplifiers 14 and 26
To stop the relay operation. As a result, an intermittent relay type tunnel booster that relays and amplifies only during the time when the train is passing is possible.

With respect to the relay ON / OFF of the slave station 6, a part of the supervisory control signal between the master station 2 and the slave station 6 is used so that the master station 2 sends a power ON / OFF control signal to the slave station 6. Is transmitted. The control unit 27 of the master station 2 inputs a power control signal for the slave station to the electrical / optical converter 15 of the master station 2 and
A power on / off signal of the slave station 6 is sent to the slave station control unit 29 via / E19. Slave station 6 that received the power control signal
Control unit 29 instructs the power supply unit 30 of the slave station 6 to start and stop the power supply to the down / up amplifiers 20 and 22 of the slave station 6. Thus, an instruction from the master station 2 to start / stop the relay operation of some or all of the slave stations 6 in the tunnel can be made.

As another control method for the slave station 6, there is a method in which a relay contact or the like is provided in the middle of a power supply system to the slave station for control. Further, regarding the sensor for detecting the passage of the train, a method of taking in the information of the passage of the train from the railway traffic monitoring system or storing the timetable in an internal memory is also possible instead of the sensor.

[0018]

As described above, by implementing the present invention, the relay service is realized by intermittently operating the relay amplifying device installed in the railway tunnel only during the passing time of the train, thereby realizing the operation of the device. Power consumption and energy saving can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of an embodiment of the present invention.

FIG. 2 is a detailed block diagram of a relay device of the present invention.

FIG. 3 is a schematic diagram of a conventional tunnel relay device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wireless base station 2 relay amplifier (master station) 3 antenna 4 transmission cable 5 mobile device 6 slave station 7 train 8 sensor 11 downlink radio wave 12 antenna 13 duplexer 14 preamplifier 15, 23 E / O converter 16 optical distributor 17, 24 Optical cable 19, 25 O / E converter 20, 22, 26 Amplifier 21 Antenna 27, 29 Control unit 28, 30 Power supply unit 31 Optical combiner

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroshi Suzuki 3-14-20 Higashinakano, Nakano-ku, Tokyo Inside Kokusai Electric Co., Ltd. (72) Inventor Yoichi Okubo 3-14-20 Higashinakano, Nakano-ku, Tokyo Kokusai Electric Inside the corporation

Claims (1)

[Claims] 1. A relay amplifying apparatus master station installed near a train passing tunnel for transmitting and receiving radio waves to and from a base station, and connected to the relay amplifying apparatus master station via a transmission cable and arranged in the tunnel. A tunnel relay amplifying device comprising a mobile station on a train passing through and a plurality of slave stations transmitting and receiving radio waves, a sensor for detecting the presence of the train while the train is in the tunnel Are installed in the vicinity of the entrance and the exit of the tunnel, and the relay amplifying device master station, when a train enters the tunnel by the train detection signal of the sensor, both the up / down amplifier of the relay amplifying device master station To turn on the power to start the relay operation, and output a power control signal to the plurality of slave stations. When the train leaves the tunnel, both the uplink and the downlink of the relay amplifier main station increase. A power supply control signal to the plurality of slave stations and outputting a power control signal to the plurality of slave stations, wherein each of the plurality of slave stations includes a power supply from the relay amplification apparatus master station. A tunnel relay amplifying device configured to turn on / off the power of both the up / down amplifiers of the slave station according to a control signal.