JPH09326745A - Relay system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a speech between a mobile station and a stationary station radio equipment even when any of the stationary station radio equipments is out of order due to a fault or the like by connecting another channel from a repeater to a controller. SOLUTION: A stationary station radio equipment 4 and a base station radio equipment 2 detect a squelch voltage respectively by the transmission from the radio equipment 4 or the mobile station 1. Through the detection of the squelch voltage, the radio equipment 4 excites the transmission of a radio equipment 2 via a repeater 3 and on the contrary, when the radio equipment 2 detects the squelch voltage, the transmission of the radio equipment 4 is started via the repeater 3. The reception signal is sent as it is in the repeater 3 to an opposite party station. Then a changeover device 6 is provided to a pre-stage of a controller 7 and an interface circuit connecting to the controller 7 via a wired line is provided to the repeater 3. Thus, in the case that a fault takes place in the stationary station radio equipments 4, 5 and they are out of order, the changeover device 6 is thrown to the position of the wired line so as to ensure a speech between both the stations 1, 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to adding a function of a relay device of a wireless relay system.

[0002]

2. Description of the Related Art A conventional wireless relay system is shown in FIG.
And it demonstrates using FIG. In FIG. 3, the mobile station 1
The transmission radio wave f _{1 from} is received by the base station radio 2 of the relay station. When the squelch voltage is detected by the relay device 3 by the reception of the base station radio 2, the fixed station radio 4 is activated. The transmission radio wave f ₂ emitted from the fixed station radio 4 is received by the radio 5 of the fixed station equipment and output by the controller 7 as a monitor. In this relay station, the reception output of the base station radio 2 is directly input to the fixed station radio 4 as a modulation input signal. Similarly, the transmission from the controller 7 is transmitted from the fixed station wireless device 5, and passes through the fixed station wireless device 4 of the relay station, the relay device 3, and the base station wireless device 2 to the mobile station 1
Will be received at. FIG. 4 shows an internal configuration example of the relay device 3 in FIG.

[0003]

In the conventional system configuration and relay device, when one of the fixed station radios forming the approach line cannot be used due to a failure or the like, a call with the mobile station can be secured. It has the drawback of disappearing. The present invention eliminates this drawback and connects another line from the relay device to the controller, so that even if one of the fixed station radios becomes unavailable due to a failure or the like, the relay can maintain a call with the mobile station. The purpose is to provide a system.

[0004]

In order to achieve the above-mentioned object, the present invention, as shown in FIG. 1, is fixed by connecting from a relay device 3 to a switching device 6 which is added to the front stage of a controller 7 by wire. The mobile station 1 and the controller can communicate with each other without using the station radios 4 and 5.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a system configuration diagram showing a configuration of a relay system which is an embodiment of the present invention. 2 is a diagram showing an example of the internal configuration of the relay device in the relay system of FIG. In FIG. 1, in each of the fixed station radio 4 and the base station radio 2, the squelch voltage is detected by transmission from the radio 4 of the fixed station equipment or the mobile station 1. By this squelch detection, the fixed station radio 4 activates the transmission of the base station radio 2 via the relay device 3, and conversely, the base station radio 2
Detects the squelch voltage, the fixed station radio 4 is activated via the relay device 3. In this way, in the relay device 3, as shown in FIG. 2, the received signal is transmitted as it is and transmitted to the partner station.

In this relay device 3, as shown in FIG. 2, the controller 7 and the interface circuit for connecting the receiving circuit of the base station radio 2 to the transmitting circuit wire line of the controller 7 via the resistance branch. An interface circuit for connecting from the transmission circuit of 1 to the transmission circuit of the base station radio 2 by a wired line is added. "To F _B" is a base station radio 2 shown in FIG. 1 in FIG. 2, "to F _X" is the fixed station radios 4, "to R _C" indicates the connection of the switcher 6. In the present embodiment, when a failure occurs in the fixed station radio and the wireless line becomes unusable, the switch 6 provided in the fixed station is switched to the wired line side to make a call between the mobile station and the control station. Can be secured.

[0007]

As described above, by adding the remote control interface circuit to the relay device, even if the radios of both the fixed stations making up the approach become unusable, the radio between the mobile station and the fixed station is eliminated. Calls can be secured.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing the configuration of a relay device according to an embodiment of the present invention.

FIG. 3 is a diagram showing a basic configuration of a conventional wireless relay system.

FIG. 4 is a block diagram showing a configuration of a conventional relay device.

[Explanation of symbols]

1 ... Mobile station, 2 ... Base station radio in relay station, 3 ... Relay device, 4 ...
Fixed station radio in relay station, 5 ... Fixed station radio,
6 ... Switching device, 7 ... Controller.

Claims (1)

[Claims] 1. A relay system in which a call is made between a fixed station and a mobile station via a relay station including a wireless device and a relay device, the fixed station is provided with a switch, and the switch of the fixed station and the switch are provided. Provide a remote control interface circuit that connects the relay device with a wired line, and if the wireless line between the fixed station and the relay station fails and the wireless line cannot be used, switch to the wired line side with the above switch. A relay system characterized by being configured to make a call with a mobile station.