JPH02123836A - Select call method for mca radio equipment - Google Patents

Abstract

PURPOSE:To discriminate whether or not a radio wave reaches an opposite station by sending an answer back signal to an opposite station automatically as soon as a select call signal to its own station is received. CONSTITUTION:When a connection request signal 1 is sent from a radio equipment 1, a control station receives a connection request signal 1 to send a channel designation signal 2 to radio equipments 1, 2. The radio equipments 1, 2 receiving the channel designation signal 2 switches the frequency to the channel and the radio equipment 1 sending the connection request signal 1 sends a selection call signal 3 including a select call number of an its own station designating the radio equipment 2 automatically. The radio equipment 2 upon the receipt of the select call signal 3 sends an answer back signal 5 including the select call number of its own station to the radio equipment 1 automatically, when the radio equipment 1 receives the answer back signal 5, the display section displays it, the select call signal 3 is sent every time a press-to-talk switch is depressed, the communication opposite party is designated and then the voice signal 4 is sent. Thus, whether or not a radio wave reaches the opposite station is discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a select call method for an MCA radio device that sends select call signals.

[Conventional technology]

FIG. 3 is a timing diagram showing the select call method of a conventional MCA radio device. In the diagram, (1) is a connection request signal sent from the radio device to the control station, and (2) is a connection request signal (1 ), (8) is the select call signal sent to the other party when the radio presses on the call channel, (4) is the audio signal sent following the select call signal (8). It is.

Next, when making an 11 call to explain the operation, first,
The radio device 1 sends a connection request signal (1) to the control station. The control station receives the connection request signal (1) and transmits the wireless device 1.
A communication channel designation signal (2) is sent to the communication channel 2. The radios 1 and 2 receive the call channel designation signal (2), switch to the designated channel, and perform a press talk call. Every time the press talk switch is pressed, the radio 1 sends out a select call signal (2) to designate the radio 2, and then sends out an audio signal (4). The same applies to the case where radio device 2 responds to radio device 1.

[Problem to be solved by the invention]

The conventional select call method for MCA radios was configured as described above, so if there is no response from the other station, it is possible that there is no response because the radio waves cannot reach it, or there is no response because the other party is far away from the radio. There was a problem in that it was not possible to determine whether the

This invention was made to solve the above-mentioned problems, and it is possible to determine whether the radio waves have reached the other station! , the purpose is to obtain a select call method for AOA radio equipment.

[Means to solve the problem]

The select call method of the MCA radio according to the present invention is to automatically send an answerback signal to the other station at the same time as receiving the select call signal for the own station.

[Effect]

In the select call method of the MCA radio according to the present invention, an answerback signal is automatically sent out in response to a select call signal from the partner station, and it is notified whether or not the radio waves have reached the partner station.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is a connection request signal sent from the radio to the control station, (2) is a call channel designation signal sent from the control station to the radio after receiving the connection request signal (1), and (8) is the connection request signal sent from the radio to the control station.
) receives the call channel designation signal (2) and transmits wireless $1
11 is a select call signal that designates the radio device 2, (6) is an answerback signal that the radio device 2 sends out by wireless filK upon receiving the select call signal (8), and (4) is sent by the breath talk switch after the above response. It is an audio signal.

Next, the operation will be explained. When the wireless device 1 sends a connection request signal (1), the control station receives the connection request signal (1) and sends a channel designation signal (2) to the wireless device 1. It is sent to radio device 2. Radio device that received channel designation signal (2) 1. Wireless v! A2 switches the frequency to the designated channel, and the radio 1 that has sent the connection request signal (1) automatically sends a select call signal (8) containing the select call number of its own station that designates the radio 2. When radio 2 receives the select call signal (8), it automatically sends an assister back signal (5) containing the select call number of its own station to radio 1, and when radio 1 receives the answer back signal (6), it displays After that, every time the breath talk switch is pressed, a select call signal (8) is sent out, and after specifying the other party, a voice signal (4) is sent out.

In the above embodiment, an answer-back signal is automatically sent out, but in this case, it is impossible to make a voice call while the call signal is being exchanged, and there is a possibility that the beginning of the voice is cut off. Therefore, as shown in Fig. 2, after receiving the channel designation signal <2) from the control station, the wireless
11. Channel designation signal (2) in wireless l112
By delaying the display of the channel occupancy indicator (6) indicating that the channel occupancy signal (6) has been received until the radio device 2 sends out the assister backup signal (6), it is possible to prevent the beginning of the voice from being cut off.

〔Effect of the invention〕

As described above, according to the present invention, when there is no response from the other station, it is possible to determine whether radio waves did not reach the other station or whether the person at the other station was away from the radio by looking at the display of the radio. It has the effect of helping you heal.

[Brief explanation of drawings]

FIG. 1 is a timing diagram showing a select call method for an MCA radio according to an embodiment of the present invention, FIG. 2 is a timing diagram showing another embodiment of the present invention, and FIG. 3 is a conventional select call method for an MCA radio. FIG. In the figure, (1) is a connection request signal, (2) is a channel designation signal, (8) is a select signal, (4) is an audio signal, (5) is a server back signal, and (6) is a channel occupancy display. . In addition, in the figures, the same reference numerals indicate the same signals or displays.

Claims (1)

[Claims] A select call method for an MCA radio that transmits a select call signal, characterized in that when a select call signal for its own station is received, an answer back signal is automatically sent.