JPH11239085A - Guided communication system and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform long distance or wide area communication by using guided communication equipment of high frequency use equipment without needing a permission, etc., in communication using the guided communication equipment in radio wave blocked area. SOLUTION: In a communication within a radio wave blocked area, a general radio repeater 4 is connected to a guiding line 2 of high frequency use equipment in the radio wave block area through a guiding converter 3 in appropriate intervals, and each general radio equipment 5 mutually communicates from the repeater 4 in a short distance to the line 2, the repeater 4 and to each general radio equipment 5. This guided communication device has the converter 3 which coverts a carrier signal in a general radio frequency into a carrier signal in a guided communication equipment frequency (below 250 kHz) of a high frequency use equipment that does not need a radio station application without violating radio wave law, guides radio waves with such field strength as is against the radio wave law by using a dedicated connector to the guiding line and also has a function that converts a carrier signal from the guiding line into a general radio frequency carrier signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system and a communication system which enable long-distance or wide-area communication by connecting an inductive communication facility and a general-purpose radio in an area where radio waves are blocked. .

[0002]

2. Description of the Related Art Conventionally, inductive communication equipment which does not require a license or the like is used in an underground structure such as a tunnel or a tunnel, in a building or a building above the ground, in a densely-built area of a building, or in a radio wave blocked area. . Communication using the guidance-type communication equipment in the above-mentioned places is limited to places where the guide wires or existing wires that are converted to the guide lines are laid, or places near them, so that laying of the guide lines is difficult. And there was a problem with communication in places where it was not laid.

[0003]

However, these radio wave obstruction areas have spread over a wide area with the expansion of the size of the above-mentioned structure, and the above-mentioned guide lines alone cannot satisfy the communication distance and the range.

The present invention has been made in view of the above points, and has been developed for an inductive communication facility of a high-frequency utilizing facility which does not require a license or the like for communication in a radio wave blocked area using the inductive communication facility. An object of the present invention is to provide an inductive communication system and an apparatus that enable long-distance or wide-area communication by connecting a wireless repeater and using a general-purpose wireless device to solve the above-mentioned problem.

[0005]

According to a first aspect of the present invention, there is provided a communication system in an area where radio waves are blocked using an inductive communication facility, wherein a general-purpose wireless repeater is connected to a guide line of a radio frequency utilization facility in the area where radio waves are blocked. Are connected to each other, and a mutual communication is performed from each general-purpose wireless device to the nearest wireless relay device, the guide wire, the wireless relay device, and each general-purpose wireless device. Note that the connection of the general-purpose wireless repeater to the above-mentioned guide wire in this specification includes a case where a line is physically connected and a case where a radio wave is guided.

According to a second aspect of the present invention, in a communication system in a radio wave blocking area using a general-purpose radio, each general-purpose radio repeater is connected to a guide line in the radio wave blocking area via an inductive converter. Connected, from each general-purpose radio, and configured to communicate with each other to the nearest radio repeater, the guide wire, the radio repeater, each general-purpose radio, the inductive converter transmits a general-purpose radio frequency carrier signal It does not violate the Radio Law by changing to a carrier signal of the inductive communication equipment frequency (250 KHz or less) of high frequency utilization equipment that does not conflict with the Radio Law and does not require radio station application etc. An inductive communication device having a function of guiding radio waves by electric field strength and having a function of converting a carrier signal from a guide wire into a general-purpose radio frequency carrier signal.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of a communication apparatus according to the present invention. In an underground building 1, a dedicated guide line 2 is provided, and a guide converter 3 is provided on the guide line 2 for each operation range. A general-purpose wireless repeater 4 is connected to each of the inductive converters 3. When a worker or the like in the underground building 1 communicates with a worker at a remote place using the general-purpose wireless device 5, a call is transmitted from the general-purpose wireless device 5, and the communication is performed by the nearest general-purpose wireless repeater 4. And the radio wave is guided to the guide line 2 via the inductive converter 3 and received by the general-purpose wireless device 5 via the remote inductive converter 3 and the general-purpose wireless repeater 4. It has become.

FIG. 2 shows the configuration of the inductive converter 3 used in the communication device of the present invention. The carrier signal of the radio frequency received from the radio repeater 4 takes in the frequency of the inductive communication equipment made by the oscillation circuit 7 in the modulation circuit 6, and the MHz is not inconsistent with the Radio Law. Is converted to KHz, which is the frequency of the inductive communication equipment of the high-frequency utilization equipment that does not require the above. The signal after the conversion is amplified by the amplifier 8 to the coupling level to the guide line 2, and the coupler 9 guides the radio wave to the guide line 2. The carrier signal of the inductive communication equipment frequency from the guide line 2 is taken into the converter 3 by the coupler 10, and the demodulation circuit 11 takes in the radio frequency generated by the oscillation circuit 12 and converts KHz to MHz. . This signal is sent to the amplifier 13
Thus, the signal is amplified to the input level of the wireless repeater 4 and input to the repeater 4.

In the above embodiment, the guide wire 2 is newly laid in the underground building 1. However, the present invention is not limited to this, and it is not limited to this, such as in an underground building such as a tunnel, a building on the ground, in a building, or in a crowded building. An existing line such as a power line already laid in the area may be used as the guide line. Although the wireless relay 4 is connected to the guide wire 2 using the inductive converter 3 in the above-described embodiment, the connection may be made by another appropriate method. Also, the structure of the inductive converter is not limited to the above embodiment.

[0010]

According to the first aspect of the present invention, a tunnel, a tunnel,
In a radio wave obstruction area such as an underground building or a densely-built area, communication between general-purpose wireless devices is performed by connecting general-purpose wireless repeaters with each other via an inductive wire, thereby providing a communication range of about 300 to 400 m between conventional general-purpose wireless devices. In comparison with, communication over a very long distance and over a wide area is enabled.

According to a second aspect of the present invention, in addition to the effect of the first aspect, a general-purpose radio frequency carrier signal is induced by using an inductive converter for connecting the general-purpose radio repeater and the induction wire. It has a function of converting to a carrier signal of a communication system frequency or converting a carrier signal from a guide line to a carrier signal of a general-purpose radio frequency, thereby ensuring the effect of the above-mentioned guidance communication device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an inductive converter used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Underground structure 2 Induction line 3 Inductive converter 4 General-purpose radio repeater 5 General-purpose radio 6 Modulation circuit 7 Oscillation circuit 8 Amplifier 9 Coupler 10 Coupler 11 Demodulation circuit 12 Oscillation circuit 13 Amplifier

Claims (2)

[Claims] In a communication system in a radio wave blockage area, a general-purpose wireless repeater is connected to an induction line of a high-frequency utilization facility in the radio wave blockage area at appropriate intervals, and
The latest wireless repeater, the guide wire, the wireless repeater,
An inductive communication system characterized by mutual communication with each general-purpose radio. 2. In a communication system in a radio wave blockage area, each general-purpose wireless repeater is connected to an induction line of a high-frequency utilization facility in the radio wave blockage area via an inductive converter, and The above-mentioned wireless repeater, the guide wire, the wireless repeater, and the general-purpose wireless device are configured to communicate with each other, and the inductive converter uses a general-purpose radio frequency carrier signal without using a license or the like at a high frequency. The equipment has a function of changing the carrier signal of the facility's inductive communication equipment frequency and guiding the radio wave to the above-mentioned guide line using a dedicated coupler, and changing the carrier signal from the guide line to a general-purpose radio frequency carrier signal. An inductive communication device, comprising: