JPH11340888A - Line selection system for radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain facsimile communication by distributing the communicating state of the satellite system radio line of a slave station from a master station to a slave station in a real time, and bypass for selecting a ground system radio line, even in the case of a facsimile equipment at the slave station side, when the satellite line of the other station is in communicating state. SOLUTION: A repeating switchboard 4 and plural line connection controllers 5-n preferentially select a satellite system radio line 7 at facsimile communication. A slave station 1 receives a communicating state signal which is transmitted from a master station in response to a request for transmission from a facsimile equipment, and determines the communicating state of a slave station 2. When the slave station 2 is not in communicating state, the slave station 1 transmits a capture signal including the station number of the slave station 2 to the master station. The master station determines the communicating state of the slave station 2, and when the slave station 2 is not in the communicating state, the master station transmits an incoming communication signal to the slave station 2. The slave station 2 transmits an incoming response signal to the master station, if the communication is available. The master station transmits a line designation signal to the slave stations 1 and 2, and changes a line to a communication line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line selection system for a wireless system.

[0002]

2. Description of the Related Art FIG. 1 is a block diagram showing the overall configuration of a radio system. In FIG. 1, 1 is a master station, 2-n is a plurality of slave stations, 3 is a line controller, 4 is a relay exchange,
n is a plurality of line connection control devices, 6 is a terrestrial radio line, 7
Is a satellite radio line, which constitutes a radio system. The switching system of the satellite radio line is performed by the line control device 3 of the master station 1 in the DAMA system. On the other hand, the switching system of the terrestrial radio line is performed by the relay exchange 4 of the master station 1 in a tandem system. Further, the relay exchange 4 and the line connection control device 5-
n is to judge whether the call is facsimile communication or telephone call. In the case of facsimile communication, a satellite radio line with relatively large delay is preferentially selected. The transmission quality in the case of telephone is improved by preferentially selecting.

Next, FIG. 3 shows a sequence diagram when facsimile communication is performed from the slave station 1 to the slave station 2. As shown in FIG. 3, the slave station 1 transmits a capture signal including the station number of the slave station 2 from the slave station 1 to the master station in response to a transmission request from a facsimile. The master station determines the call state of the slave station 2, and if the slave station 2 is not talking, the master station transmits an incoming notification signal to the slave station 2. The slave station 2 is able to communicate with the slave station 2
Sends an incoming response signal to the master station. The master station transmits a line designation signal to the slave stations 1 and 2, and changes the line to a communication line.

[0004]

The above-mentioned prior art includes the following:
When facsimile communication is performed from the slave station 1 to the slave station 2, there is a disadvantage that the satellite system line is preferentially selected even if the line of the slave station 2 is busy, so that a call cannot be made. This is because the communication status of the satellite wireless line of the slave station 2 cannot be determined by the slave station 1. The present invention eliminates this drawback and realizes a line selection system that allows a slave station (eg, slave station 1) to determine the communication status of a satellite wireless line of another slave station (eg, slave station 2). Aim.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a slave station by distributing communication status information of a satellite-based wireless line of the slave station in real time from the master station to the slave station. The side (slave station 1) can determine the communication status of another satellite station (slave station 2) on a satellite radio line.
As a result, the slave station 1 determines the communication state of the satellite wireless line of the slave station 2 and, when the satellite wireless line of the slave station 2 is busy, by bypassing the terrestrial wireless line in facsimile communication. , Facsimile communication.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

[0007] The overall configuration of the wireless system is, for example, the same as the configuration of FIG. 1 described above. FIG. 2 shows a sequence diagram when facsimile communication is performed from the slave station 1 to the slave station 2.
In FIG. 2, the slave station 1 receives a call status signal transmitted from the master station in response to a call request from a facsimile,
The communication state of the slave station 2 is determined. Here, if the slave station 2 is not talking, a capture signal including the station number of the slave station 2 is transmitted from the slave station 1 to the master station. The master station determines the call state of the slave station 2, and if the slave station 2 is not talking, the master station transmits an incoming notification signal to the slave station 2. If the slave station 2 can make a call,
The slave station 2 transmits an incoming response signal to the master station. The master station transmits a line designation signal to the slave stations 1 and 2, and changes the line to a communication line.

[0008]

According to the present invention, the slave station side (slave station 1) determines the communication status of the satellite radio line of another slave station (slave station 2), and the satellite radio line of the slave station 2 is determined. Is busy, the facsimile communication can be performed by selecting the terrestrial radio line by-pass even in the facsimile communication.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a wireless system.

FIG. 2 is a sequence diagram when performing facsimile communication from the slave station 1 to the slave station 2 according to one embodiment of the present invention.

FIG. 3 is a sequence diagram when performing facsimile communication from a conventional slave station 1 to a slave station 2.

[Explanation of symbols]

1: master station, 2-n: plural slave stations, 3: line controller, 4: relay exchange, 5-n: plural line connection controllers, 6: terrestrial radio line, 7: satellite radio line.

Claims (1)

[Claims] A wireless system in which a master station and a plurality of slave stations are connected by a plurality of wireless lines including a satellite system line and a terrestrial system line, and each of the slave stations selects a wireless line. A line selection method for a wireless system, wherein the station transmits call state information of a slave station, the slave station receives the information, and selects and designates a call line based on the information.