JPH02290338A - Wireless communication system between underground mobile system and surface mobile system - Google Patents

Abstract

PURPOSE:To easily and surely attain the radio call with a press-to-talk system between underground and on-ground mobile stations by using a controller and connecting on-ground and underground base stations in response to the mobile station. CONSTITUTION:On-ground base stations 7-1 to 7-n and underground base stations 2-1 to 2-n are connected via a controller 1 in response to a control signal by a connection control signal generating means from one of on-ground and underground mobile stations 8-1 to 8-n and 3-1 to 3-n. Through the connection, the radio communication by the press-to-talk system is implemented easily and surely among the on-ground and underground mobile stations 8-1 to 8-n and 3-1 to 3-n.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication method in a mobile radio communication system.

[Summary of the invention]

The present invention provides a conventional mobile radio station with a base station selection function by transmitting a tone, and receives the signal in a control device that connects a terrestrial radio base station and an underground radio base station. This is a communication method that enables press-to-talk wireless communication between mobile radio stations.

[Conventional technology]

Previously, there were independent wireless communications on the ground and in underground passages, but there was no system that automatically connected the above ground and underground passages and enabled calls between mobile radio stations. Figure 2 shows
A conventional communication system system diagram is shown. 3-1.3-n indicates an underground mobile radio station, and 8-1.8-n indicates an above-ground mobile radio station.

Considering the conventional technology, calls between mobile radio stations in underground passages and above ground require relay operations between terrestrial radio base stations 7-1 to 7-n and underground radio base stations 2-1 to 2-n. An operator was needed to do this. Specifically, a mobile station notifies a relay operator via a radio base station that it wishes to conduct a call between mobile comrades between above ground and underground. In response to this, the relay operator manually connects the terrestrial wireless base station and the underground wireless base station. After the connection is completed, the relay operator wirelessly informs the mobile station that the connection is complete.

After this, the mobile stations start communicating by radio.

[Problem to be solved by the invention]

The method of the present invention was developed in electric power companies due to the necessity of maintaining underground power lines, which have recently begun to be adopted, while communicating with maintenance personnel for overhead power lines. Since radio waves cannot be transmitted in the conventional closed state between above ground and underground, it is necessary to communicate with each other's work status by telephone, etc.

In order to solve this problem, the present invention connects a terrestrial radio station and an underground radio station by wire via a communication control device that has an interconnection control function, so that maintenance personnel who have mobile radios can directly communicate with each other by radio. It has been made possible to do so.

[Means and operations for solving the problem] In order to achieve the above object, the present invention provides a mobile station with a connection control signal generating means, and a control device that receives the above signal from the mobile station and It controls the connection between base stations and terrestrial base stations, enabling mobile radio communications between underground and terrestrial base stations.

〔Example〕

An embodiment of the present invention will be explained below with reference to FIG. 1.

Figure 1 shows the system diagram of this system.

First, base stations 7-1 to 7- are used as a terrestrial wireless communication system.
n and mobile stations belonging to that area are shown at 8-1 to 8-n. In addition, base stations 2-1 to 2-2 are used as an underground wireless communication system.
-n, mobile stations belonging to that area are shown in 3-1 to 3-n. Normally, terrestrial wireless communication systems and underground wireless communication systems independently perform press-to-talk type wireless communication between base stations and mobile stations or between mobile stations.

When making a call between a terrestrial mobile station and an underground mobile station, a terrestrial base station is selected using a selection switch provided on the microphones of both mobile stations. Each mobile station is equipped with tone signal and call termination signal generation means corresponding to the number of base stations on the ground,
Use the selection switch to identify a base station and make a call. In this case, it is only necessary for both parties to perform the selection operation on the mobile station that makes the first call.

In the figure, when the terrestrial mobile station 8-1 selects the nearest base station 7-1 using this selection switch, a corresponding tone signal is transmitted from the terrestrial mobile station 8-1 and transmitted via the base station 7-1. It is received by the control device 1 connected by wire. When the control device detects this tone signal, the ground base station 7-1
and underground base station 2. -1 to 2-n are connected. The control device acts as a switch and mainly consists of a filter.

That is, the connection signal coming from the ground is connected to the underground base station, and the tone signal sent via the underground base station is detected by a filter, the corresponding ground base station is selected, and the connection is made. I'm trying to make it happen.

Through the base station connected in this manner, a wireless communication by press talk can be made between the mobile station on the ground and the mobile stations 3-1 to 3-n in the underground tunnel.

When a terrestrial base station is selected from an underground mobile station to make a call, the control device similarly detects the selected tone signal to connect the corresponding terrestrial base station and underground base station. In the figure, 5 indicates a leaky coaxial cable, 4 indicates a distributor, and 6 indicates a two-wire wired cable.

To end a call, press the end switch on the microphone of the mobile station, and the corresponding tone signal is transmitted from the mobile station to the base station 7-1 (or base stations 2-1 to 2-n).
) is received by the control device 1 connected by wire. When the control device 1 receives this signal, the connection between the terrestrial base station and the underground base station is canceled.

〔Effect of the invention〕

According to the present invention, it is possible to communicate between mobile radio stations without using other means such as telephone communication between above ground and underground, improving work efficiency, direct communication, and intermediary communication. It is possible to measure the safety of work by preventing false alarms caused by such factors.

[Brief explanation of the drawing]

Fig. 1 shows a system diagram of the present invention, and Fig. 2 shows a conventional system system diagram.
3-n: underground mobile station, 4: distributor, 5: leaky coaxial cable, 6: 2-wire wired cable, 71J to 7-n: terrestrial base station, 8-1 to 8-n: terrestrial mobile station shows. Second [2

Claims (1)

[Claims] 1. Transmission from a mobile radio station via a control device between a radio base station in a mobile radio communication system on the ground and a radio base station in a mobile radio communication system in an underground tunnel closed to the ground. The connection is made according to the connection control signal given,
A wireless contact communication system characterized by wireless communication between aboveground and underground mobile radio stations using a press-talk method. 2. In the underground mobile system and the terrestrial mobile system, which are each composed of a mobile radio station and a radio base station, a control device is provided between the two systems to control the connection of both systems, and the mobile radio station is is provided with means for generating a connection control signal indicating a terrestrial radio base station, the radio base station is provided with means for receiving said connection control signal from a mobile radio station, and transmitting it to said control device; The control device receives the connection control signal coming from the underground mobile system, connects the line to the corresponding terrestrial wireless base station, and also receives the connection control signal coming from the terrestrial mobile system, and connects the line to the underground mobile system. A wireless communication communication system characterized in that mobile radio stations of both systems perform radio communication by providing means for controlling the same.