JPS62219828A - Repeater station control system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] This is a system for controlling the operation of a relay station that relays between a master station and a designated slave station among multiple slave stations using a single radio. In addition to providing a control signal oscillator, the relay station includes means for emitting an audio frequency signal (tone signal) to each slave station at a predetermined period during a period when transmission from the master station to the slave station is suspended, and a means for emitting an audio frequency signal (tone signal) from the slave station. This configuration further includes means for occupying a relay line from the slave station to the master station in response to a control signal sent from the slave station to the master station, thereby enabling communication from the slave station to the master station.

[Industrial application field]

The present invention relates to a control method for a relay station that relays between a master station and a plurality of slave stations using a single radio, and particularly to a relay station that allows any slave station to occupy a relay line and contact the master station. This is related to the control method.

In the communication relay method between a master station using a single radio and a slave station specified by the master station among multiple slave stations, communication from the master station to the slave station is mainstream, and communication from a slave station other than the designated slave station is Unable to communicate with master station.

For this reason, when a slave station wants to contact a master station, it relies on telephones, etc., and when a slave station is located in a remote area, communication becomes difficult.

Therefore, there is a need for a relay station control system that allows a slave station to contact a master station using a relay line.

[Conventional technology]

FIG. 4 shows a block diagram of a conventional relay station control system.

In order to relay radio waves from the master station to the slave stations, the relay station 9 includes a transmitter (TXO) of the master station 1, a receiver (RXI) 3 that receives the transmitted radio waves from the transmitter 2, and a receiver (RXI) 3 that receives the signals received by the RXI. Transmit to the slave station! a (TX2) 4. On the other hand, in order to relay radio waves from each slave station to the master station, a reception station that receives radio waves transmitted from the slave stations is used.
(RX2) 10 and a transmitter (TXi) that transmits the signal received by RX2 to the master station receiver (0 to R) 17
It is equipped with 11.

In addition, by the slave station designation signal emitted from the master station 1, the transmitting antennas 12-1 and 12-2 and the receiving antennas 13-1 and 13 facing the first slave station 6 and the second slave station 7 shown in the figure are transmitted.
-2, and a switch switching circuit 5 that switches the antenna switch 8.

For example, in response to a designation signal from the master station 1 that designates the first slave station 6, the switch switching circuit 5 switches the antenna switch 8 to the transmitting antenna 12--which faces the first slave station 6.
1 and the receiving antenna 13-1.

The radio wave transmitted from the master station I is amplified through RXI and TX2, transmitted from the transmitting antenna 12-1, and received by the receiver of the first slave station 6.

On the other hand, the transmitted radio waves from the first slave station 6 are received by the receiving antenna 13-1 of the relay station, amplified through RX2 and TXI, and received by the receiver of the master station Communication between stations 6 is carried out.

In this way, a slave station is designated by the master station, and communication is performed between the designated slave station and the master station. Note that since the communication is carried out using a single frequency, a breathtalk method is used to define the communication timing.

[Problem that the invention seeks to solve]

In the above method, if a slave station wants to communicate with the master station during a period when communication from the master station to the slave station is suspended, the slave station does not know whether the antenna switch 8 is connected to its own side, and , if the slave station is connected to another slave station, the communication line with the master station becomes disconnected, making it impossible for the slave station to communicate with the master station.

The present invention was created in view of these points, and is a relay station that enables communication from a slave station to a master station under control of the slave station during a period when communication from the master station to the slave station is suspended. The purpose is to provide a control method.

[Means for solving problems]

FIG. 1 is a principle block diagram of the relay control system of the present invention, in which each slave station is provided with a control signal oscillator 14, and the relay station uses a period in which no transmission is performed from the master station to the slave stations. means 15 for emitting a tone signal at a predetermined period to each slave station 6, 7; and means 16 for maintaining a relay line 18 from the slave station to the master station 1 by means of a control signal emitted from the slave station. It has a configuration with an attached.

[Effect]

A tone signal emitting means 15 provided in the relay station emits a tone signal to each slave station at a constant period during the transmission suspension period of the master station.

A slave station that wants to communicate with the master station 1 transmits a control signal from the control signal oscillator 14 at timing 1 when it receives the tone signal,
By activating the relay line holding means 16 of the relay station, the relay line 18 is
, and performs communication to the master station 1.

In the present invention, communication from the slave station to the master station is enabled by controlling the relay station from any slave station and occupying the communication line between the slave station and the master station.

〔Example〕

FIG. 3 is a block diagram of a relay station control system according to an embodiment of the present invention.

As shown in FIG. 3, in the relay control system of one embodiment, a control signal oscillator 14 is attached to each slave station.

In addition, the relay station includes a tone signal oscillator 15-1 that oscillates a tone signal during a communication suspension period from the master station, and a switch changeover circuit 15- that switches the antenna for each slave station at a constant cycle and emits a tone signal. Tone emitting means 1 consisting of 2
5, and a relay line holding means 16 comprising a switch clamp circuit 15-2 which clamps the switching operation of the antenna switch 8 by the control signal emitted from the control signal oscillator 14 of the slave station.

Normal communication between a master station and a slave station designated by the master station can be performed by the method described in detail in the conventional example.

Now, when normal communication is completed, a call termination signal is issued from the master station I. This end-of-call signal is detected by the tone oscillator 15-1 and the switch changeover circuit 5 via the receiver R1 of the relay station 9.

When the tone oscillator 15-1 detects the end-of-call signal, the tone oscillator 15-1
A continuous tone signal as shown in Figure A is oscillated, modulated by the transmitter TX2, and emitted toward the slave station.

On the other hand, the switch switching circuit 5 alternately switches the transmitting and receiving antenna facing the first slave station and the transmitting and receiving antenna facing the second slave station at a constant cycle,
The tone signals are transmitted to the first and second tone signals at the timing shown in
to the slave station. That is, the second slave station 7 is
The tone signal is received at the timing of the shaded part.

Now, if you want to communicate from the second slave station 7 to the master station I,
As shown in FIG. C, the control signal oscillator 14 oscillates the control signal C1 at the timing when the tone signal is received. This control signal C1 is received by the reception v&RX2 via the second slave station 7 and the reception antenna 12-2 of the relay station, and is input to the switch clamp circuit 15-2.

The switch clamp circuit 15-2 clamps the antenna switch 8 using the control signal C1, occupies the communication line between the second slave station 7 and the master station l, and prevents communication from the second slave station 7 to the master station l. Do this.

When the communication to the master station 1 is completed, the control signal oscillator 14 oscillates the call termination signal C2 shown in FIG. 2C, and the clamping operation of the switch clamp circuit 15-2 is released.

When it is desired to communicate with the master station from another slave station, the procedure is the same as described above, and the slave station communicates with the master station at any time.

〔Effect of the invention〕

As explained above, according to the present invention, communication from the slave station to the master station is possible during the period when the communication from the master station to the slave station is suspended, thereby improving the efficiency of contact operations from the slave station to the master station, etc. can be achieved.

[Brief explanation of drawings]

FIG. 1 is a principle block diagram of the relay station control method of the present invention, FIG. 2 is a time chart of the relay station control method of one embodiment, FIG. 3 is a block diagram of the relay station control method of one embodiment, and FIG. The figure is a schematic diagram of a conventional relay station control system. In the figure, 1 is the master station, 2 is the transmitter (TKO), 3 is the receiver (RKI), 4 is the transmitter (TX2), 5 is the switch changeover circuit, 6 is the first slave station, and 7 is the second slave station. slave station, 8 is the antenna switch, 9 is the relay station, 10 is the receiver (RX2)
, 11 is a transmitter (TXI), 12-1.13-1 is a transmitting and receiving antenna facing the first slave station, 12-2.1
3-2 is a transmitting and receiving antenna facing the second slave station, 14
15 is a control signal oscillator, 15 is a tone signal emitting means, and l5-
1 is a tone oscillator, 15-2 is a switch clamp circuit,
16 is a holding means, 17 is a receiver (RXO), and 18 is a relay line. Joito Ming's 〒11K6R Directions 70-7 Edicts 1st
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Claims (1)

[Claims] In a relay station (9) that relays communication between a master station (1) and a slave station designated by the master station among a plurality of slave stations, each slave station is provided with a control signal oscillator (14), means (15) for emitting a tone signal to each slave station at a predetermined period during a transmission suspension period from the master station to the slave station in the relay station;
1. A relay station control system comprising: means (16) for occupying a communication line from an arbitrary slave station to a master station in response to a control signal emitted from an arbitrary slave station.